结构力学答案（Structural mechanics answer）

结构力学答案（Structural mechanics answer） 结构力学答案(Structural mechanics answer) "The test of structural mechanics" chapter 01 Online The first question, multiple-choice questions (1 points for each question 5 questions, a total of 5 points) The object of study, 1 structural mechanics B The structure of A, B, single pole rod C, shell D, entity structure 2, the structure strength calculation purpose is to ensure that the structure of A A, B, economical and safe without excessive deformation C D, beautiful and practical and non rigid motion 3, the structure stiffness calculation, is to ensure that the structure of C A, no rigid motion B, beautiful and practical C, without excessive deformation of D, economical and safe 4, there are several fixed hinge support constrained force component? B A, a B, two C, three D, four 5, there are several movable hinge support constrained force component A A, a B, two C, three D, four Second questions, multiple choice questions (2 points for each question 5 questions, a total of 10 points) 1, the stability of structure is DE A, structure of resistance failure The ability of B and non rigid motion C, the structure of the ability to resist deformation D, the resistance ability of instability The structure of E, the ability to keep the original balance form What kind of situation is not 2, the following BCDE plane structure A, all of the axis of the rod are positioned in the same plane, the load also function in the plane B, all of the axis of the rod are positioned in the same plane, and the plane vertical load C, all of the axis of the rod are positioned in the same plane, and the plane parallel load D, all of the axis of the rod are not located in the same plane Effect of E and load is not in the structure plane Which of the following conditions should be 3, according to the spatial structure of ABDE A, all of the axis of the rod are positioned in the same plane, and the plane vertical load B, all of the axis of the rod are not located in the same plane C, all of the axis of the rod are positioned in the same plane, the load also function in the plane D, all of the axis of the rod are positioned in the same plane, and the plane parallel load Effect of E and load is not in the structure plane 4, in order to ensure that the structure is economical and safe, to calculate the structure of B A, strength B, stiffness C, stability D, force E, displacement 5, the constraints of rigid node is AB A, the rod end cannot move relative to constraint B, binding the rod end can not rotate The rod end C, constraints can be relatively moved along one direction D, the relative rotation rod end constraints E, the relatively movable rod end constraints Third questions to determine the problem (1 points for each question 5 questions, a total of 5 points) 1, shell thickness is far less than the other two dimensions. Correct 2, the entity structure and thickness of the other two dimensions are of the same order of magnitude. Correct 3, in order to ensure that the structure is economical and safe, to carry out stiffness calculation of structure. error 4, structural mechanics is a subject of bar structure strength, stiffness and stability. Correct 5, the hinge node constraint cannot move relative to the rod end, but the relative rotation. Correct "The test of structural mechanics" chapter 02 Online The first question, multiple-choice questions (1 points for each question 5 questions, a total of 5 points) 1, the three rigid geometric composition without redundant constraint invariant system, the number of constraints is necessary for D A, 3 B, 4 C, 5 D, 6 2, what is the hinge to connect four rigid plates node? C A, B, single hinge node incomplete hinge node C, D, combined hinge node node 3, connecting two rigid plates hinge has several constraints? A A, 2 B, 3 C, 4 D, 5 4, there are several fixed hinge support constraints? B A, a B, two C, three D, four 5, a link system can reduce several degrees of freedom? A A, 1 B, 2 C, 3 D, 4 Second questions, multiple choice questions (2 points for each question 5 questions, a total of 10 points) Calculate the degrees of freedom ABC 1 geometry system A, may be greater than zero B, may be equal to zero C, may be less than zero D, must be greater than zero E, must be equal to zero 2, if the system is not a geometric system, then the BCD A, calculate the degrees of freedom may be greater than zero B, calculate the degrees of freedom may be equal to zero C, calculate the degrees of freedom may be less than zero D, degree of freedom must be equal to zero E, calculate the degrees of freedom must be equal to zero 3, from two yuan to remove a non redundant constraint geometric invariant system after the new system ACE A, is free of unnecessary restrictions of geometric invariant system B, geometry variable system C, the same degree of freedom D, is a redundant constraint geometric invariant system E, is a geometric transient system 4, the plane system in a link BCE A, can reduce the system of two degrees of freedom B, can reduce the system of one degree of freedom C, there is a constraint D, which has two degrees of freedom E, which has three degrees of freedom 5, the following discussion is correct A, transient system in small load will produce great force ABCE B, the only geometric invariant system can be used as a building structure C, building structure degree of freedom is equal to zero D, building structure calculation of degrees of freedom is equal to zero E, degree of freedom equal to zero system that can be used as building structure Third questions to determine the problem (1 points for each question 5 questions, a total of 5 points) 1, the connection of two restriction effect two link rigid body is equivalent to a single hinge. Correct 2 degrees of freedom, equal to zero system that can be used as building structure. Correct 3, a link is equivalent to a constraint. Correct 4, a single hinge can reduce the system of two degrees of freedom. Correct 5, a single hinge is equivalent to two constraints. Correct "The test of structural mechanics" chapter 03 Online The first question, multiple-choice questions (1 points for each question 5 questions, a total of 5 points) 1, if a beam axis is parallel to the shear diagram and bending moment diagram for C A, B, parallel to the axis of zero C, D, two parabolic oblique line 2, if the shear diagram of a beam is zero line, then the moment diagram for B A, B, zero line parallel axis C, D, two parabolic oblique line 3, if a beam axis is parallel to the shear diagram, the load on the beam is A A, B, no load uniform load C, D, a couple of concentrated force In 4, the mutation at the moment of beam is what force? C A, axial force B, transverse concentrated force C, D, a couple of forces Thrust 5, three hinge arch has nothing to do with the following factors? D A, high B, load vector C, D, the span of arch axis shape Second questions, multiple choice questions (2 points for each question 5 questions, a total of 10 points) 1, change the following factors that will not change the internal force of statically determinate beam? BCE A, load B, section size C, material properties D, the span of the beam E, the stiffness of the beam 2, which of the following factors on static beam internal force does not produce BCDE A, load B, temperature change C, mobile support D, manufacturing error E, material shrinkage 3, if the shear diagram of a simply supported beam is a parallel axis, then the load on the beam may be ABC A, a left support action of a couple B, have the right support action of a couple C, a cross between a concentrated moment D, a cross between the uniform load. E, a cross between a concentrated force The characteristics of internal force diagram 4, beam without loading section is B A, the shear diagram parallel axis B, linear oblique shear diagram C, two parabolic shear diagram D, the bending moment diagram of parallel axis E, the bending moment diagram of oblique line 5, static beam section size change, which of the following factors do not change? The displacement of ABCD A, axial force B, shear C, moment D, bearing force E, displacement Third questions to determine the problem (1 points for each question 5 questions, a total of 5 points) 1, the external force in the basic part, internal force, deformation and displacement of accessory parts are zero. error 2, static structure only by the equilibrium conditions we can find all the internal force and reacting force. Correct 3, static structure in the movement of the bearing under the action of internal force, do not produce. Correct 4, static structure only by the equilibrium conditions we can find all the internal force and reacting force. Correct 5, zero rod force, so it is not needed in the truss rod can be removed. error "The test of structural mechanics" chapter 04 Online The first question, multiple-choice questions (1 points for each question 5 questions, a total of 5 points) 1, the parallel chord truss beam (upper and lower internodes, when the upper bearing alignment) and lower load influence line is different is that? D Influence of A, B, axial force of upper chord line oblique axial force line The influence line of effect of C and the bottom chord axial force, axial force vertical line D 2, overhanging beam a line shape feature is A A B, a straight line, two lines line C, the two parallel lines D, parabola 3, support the extended beam shear influence line shape feature is C A B, a straight line, two lines line C, the two parallel lines D, parabola Section 4, overhanging beam bending moment influence line between supports is B A B, a straight line, two lines line C, the two parallel lines D, parabola 5, by the master-slave structure stress characteristics show that the internal force influence line affiliated part in the basic part of A A, B, all is zero C and D are all negative, positive or negative Second questions, multiple choice questions (2 points for each question 5 questions, a total of 10 points) Shear effect of 1 section C, beam line, vertical scale C is left a, right C vertical scale is B, the following discussion is correct AB A, a P = C 1 C in the left section shear generated B, B P = C 1 C shear in the right when the C, a P = C C 1 in the left section shear point generated D, B for P = 1 at C C during right shear E, a P = C 1 C shear in the right when the 2, the bearing section overhanging beam bending moment influence line shape is ABCD In A, the bearing vertical scale is zero Except B, the bearing is a straight line. C, the bearing is in the zero line D, the other at the bearing vertical scale is zero E, a straight line 3, with the static part of the statically indeterminate beam, statically indeterminate part of the internal force influence line is characteristic of AB A, in the static part is on the line B, in the indeterminate part is curve C, in the static part is curve D, in the indeterminate part is linear In E, the entire structure is curve 4, drawing method of influence line AB A, static method B, mobile method C, force method D, displacement method E, moment distribution method Effect of line 5, which of the following is the dimensionless value? ABE A, bearing force B, shear C, moment D, the restriction moment E, axial force Third questions to determine the problem (1 points for each question 5 questions, a total of 5 points) K effect of line 1, C beam section bending moment in Shubiao said the moment P = K section 1 in the K point of the. error 2, if there is a concentrated force on the influence line of vertex, will load the critical position. error The maximum vertical bending moment influence line 3 and the fixed end of the cantilever beam section of standard section at the free end. Correct 4, beam bending moment influence line is broken. Correct 5, the static truss influence line in a straight line between adjacent nodes will. Correct "The test of structural mechanics" chapter 05 Online The first question, multiple-choice questions (1 points for each question 5 questions, a total of 5 points) 1, static frame displacement in the movement of the bearing under the action by what is produced? D A B, the bending deformation and axial deformation C, D, shear deformation and rigid body motion 2, using the principle of virtual work, the state should meet what conditions? D A, B, continuous constraints C, D, physical balance 3, the plane frame displacement under load deformation is mainly caused by what? B A B, the bending deformation and axial deformation C D, shear deformation and torsion deformation 4, support for mobile indeterminate structure will produce C A B, the internal force and support reaction force C, D displacement and deformation In 5, the reciprocal theorem in delta = delta 12, 21, A A, 12 B, 11 sigma delta C, 22 D, 31 sigma delta Second questions, multiple choice questions (2 points for each question 5 questions, a total of 10 points) 1, when the force acting on the part of A, a subsidiary of the internal force is not zero. B, a subsidiary of the displacement is not zero C, a subsidiary of the deformation is not zero. D, part of the basic force is zero E, the basic part of the deformation is zero 2, the static properties will change the structure of the material, which of the following factors do not change? A, displacement B, deformation C, axial force and shear force D, moment E, bearing force 3, two static frame geometry and size, load, the same material but different section size, the two factors are the same A, force B, force C, stress D, displacement E, deformation 4, two static two static frame geometry and the same size, load and section size but with different materials, the two factors are the same A, force B, force C, stress D, displacement E, deformation 5, the master-slave structure, only part of temperature rise, the following discussion is correct ACDE A, the internal force of structure B, the whole structure deformation C, part of the deformation D, part of the zero displacement E, the basic part of the deformation is zero Third questions to determine the problem (1 points for each question 5 questions, a total of 5 points) 1, the structure deformation, will cause displacement, in turn, will have deformed structure displacement. error 2, static structure temperature changes caused by the displacement calculation formula is only applicable to the static set structure, is not suitable for statically indeterminate structure. Correct 3, the virtual work is a fictional work, is actually not possible. error 4, static structure in non load under the action of external factors, but does not produce force, displacement. Correct 5, can not use the displacement diagram multiplication for three hinge arch. Correct "The test of structural mechanics" chapter 06 Online The first question, multiple-choice questions (1 points for each question 5 questions, a total of 5 points) 1, the typical force equations, pay coefficient D A, B, constant constant greater than zero is less than zero C, D, equal to zero can be positive or negative to zero 2, get rid of a movable hinge support, equivalent to remove several constraints? A A, 1 B, 2 C, 3 D, 4 3, get rid of a directional support, equivalent to remove several constraints? B A, 1 B, 2 C, 3 D, 4 4, get rid of a fixed hinge bearing, equivalent to remove several constraints? A A, 2 B, 3 C, 4 D, 5 5, the essence of force equation is D A, B, physical condition of equilibrium conditions C, theorem D and displacement conditions Second questions, multiple choice questions (2 points for each question 5 questions, a total of 10 points) 1, single span symmetric structure in antisymmetric loads, section ACD on the symmetry axis A, displacement along a symmetry axis direction is zero The displacement of B, vertical symmetry axis direction is zero C, the bending moment is zero D, the axial force is zero E, the angular displacement is zero 2, two span symmetric structure under symmetrical load, the following discussion is correct Rigid node line displacement A, the symmetric axis is zero B, on the axis of symmetry of the rigid joint angular displacement is zero C, in the column no moment D, no shear column E, in the column without axial force 3, in the typical force equations in coefficient is ABCD A, can be positive B, may be negative C, may be zero D, there is reciprocal relation E, and the external cause 4, the typical force equations can be positive or negative zero is A, 11. B, 12. C, 21. D, 22. E, Delta 1P The basic system of computing 5, force method can be ABD A, static structure B, no extra bound geometric invariant system C, geometric transient system D, a statically indeterminate structure E, geometric constant variable system Third questions to determine the problem (1 points for each question 5 questions, a total of 5 points) 1, open a single hinge, equivalent to removing two constraints. Correct 2, get rid of a fixed hinge bearing, equivalent to removing two constraints. Correct The basic unknown quantity 3, force method is redundant force. Correct 4, the main factor in the typical force equations of constant greater than zero. Correct 5, the internal force calculation of statically indeterminate structure should consider the equilibrium condition and deformation continuity condition. Correct "The test of structural mechanics" chapter 07 Online The first question, multiple-choice questions (1 points for each question 5 questions, a total of 5 points) 1, fixed at both ends with statically indeterminate beam angle, the known A terminal of the 0 A bar is internal force error is C A MB, A B, MA 2I = theta theta A = 4I C QAB, 3I A/l D, theta = - QBA = - 6I A/l. In 2, the typical displacement method equation R11 * Z1+r12 * Z2+R1P * Z1+r22 * R21 = 0, Z2+R2P = 0, the following formula is correct B A, R11 B, R12 = R21 = R22 C, R12 * Z2 = R21 * Z1 D, R1P = R2P 3, one end is fixed with one end hinged with the statically indeterminate beam angle, known fixed end A theta is A, shear force of bar terminal for A A, 3I A/l B, 6I - theta theta A/l C, 12I A/l D, 0. 4, A end fixed B end hinged with statically indeterminate beam, fixed end known angle theta A, the following conclusion is wrong C A, MB = 0, MA = B 3I A. C, QBA = 0, QAB = D 3I 9 A/l 5, the beam stiffness of single span single infinite non hinged rectangular frame, the following discussion about the basic unknown displacement method, the right is C A, three B, two basic unknown basic unknown quantity C, just two node angle is zero, only one unknown quantity D, just two node angle is not zero, only an unknown quantity. Second questions, multiple choice questions (2 points for each question 5 questions, a total of 10 points) 1, if the additional constraint in the basic system of displacement force (torque) is equal to zero, then AE A, the basic system is consistent with the original structural stress, deformation. B, the basic system and the original structure of the force is not consistent, inconsistent deformation. C, the basic system is consistent with the original structure of the force, but the deformation is not consistent. D, the basic system and the original structure of the force is not the same, but the same deformation. E, the basic system of the original structure and equivalent. 2, single span symmetric structure in antisymmetric loads, section ADE on the symmetry axis A, displacement along a symmetry axis direction is zero The displacement of B, vertical symmetry axis direction is zero C, the angular displacement is zero D, the bending moment is zero E, the axial force is zero 3, two cross symmetric structure under antisymmetric loads, the following discussion is correct AE The vertical displacement of rigid node A, the symmetric axis is zero B, on the axis of symmetry of the rigid joint angular displacement is zero C, in the column no moment D, no shear column E, in the column without axial force 4, using the displacement method to calculate the loads of statically indeterminate structure, the rod relative stiffness is calculated by AB The real displacement A, node displacement is not structure B, the internal force is correct C, node displacement is the real displacement of structure D, the internal force is not correct E, node displacement and internal force are correct 5, the following discussion about the basic system of displacement method is correct AC The basic system of A, the displacement method is a group of single span statically indeterminate beam The basic system of B, the displacement method is static structure The basic system of displacement method C, a structure is unique D, a method of structure displacement basic system has many choices The basic system of E, the displacement method is geometry variable system Third questions to determine the problem (1 points for each question 5 questions, a total of 5 points) 1, one end is fixed with one end hinged with the statically indeterminate beam, fixed end angle theta A is known as B, angle hinged = - 0 A (CCW). error 2, the displacement method can calculate the statically indeterminate structure can also calculate the static structure. Correct 3, hyperstatic structure calculation of total principle is the desire of statically indeterminate structure to take a basic system, and then make the basic system in terms of stress and deformation of the original structure and the same. Correct 4, one end is fixed with one end hinged with the statically indeterminate beam, fixed end angle theta A is known as MA, bending moment of the fixed end theta = 3I A. Correct 5, one end is fixed with one end hinged with the statically indeterminate beam, fixed end angle theta A is known as the QAB, bar shear -3i theta = A/l. Correct "The test of structural mechanics" chapter 08 Online The first question, multiple-choice questions (1 points for each question 5 questions, a total of 5 points) 1, what kind of structure can not be calculated by the method of moment distribution? D The structure of A, B, non continuous beam node linear displacement C, frame D, node displacement of structure 2, member AB A end is a fixed end, no load span, known B end moment is m, then A = AB rod end bending moment C, m/2 3, the multi node structure, obtained the moment distribution method is C A B, the approximate solution and exact solution C, D, analytic solution asymptotic solution 4, A rod end is fixed and the B end of the sliding line stiffness I, rotational stiffness of C A terminal A, 4I, B, 3I C, I, D, 0 5, when the distal end is a fixed end, the transfer coefficient is equal to B A, 1 B, 0.5 C, -1, D, 0 Second questions, multiple choice questions (2 points for each question 5 questions, a total of 10 points) 1, only what moment to the distal transfer? BD A, fixed end moment B, the distribution of bending moment Finally, the bending moment C The proximal bending moment D, the rotation of the rod end The distal end of the rotating bending moment E, the 2, A rod end is fixed and the B end of the sliding line stiffness is I, the following formula is correct A, SBA = I B, SAB = 3I C, SAB = I D, SBA = 3I E, CAB = 1 3, the moment distribution method can be used to calculate the structure of what kind of? ABC A, continuous beam B, a non sway frame The structure of C, no node displacement The structure of D, no node displacement E, the beam stiffness is infinite structure 4, continuous beam in a bearing of two adjacent span live load, to both sides of every span live load is the most unfavorable load on what the layout A, the support section of negative moment B, the force of support C, the positive moment span D, the seat on the right side of the maximum shear force E, the left side of the smallest section shear bearing 5, the following discussion about the moment distribution method is correct? A, moment distribution method to obtain exact solutions B, get the asymptotic solution of moment distribution method C, from the first node unbalanced torque larger absolute value of node to start D, you want to change the unbalanced joint torque distribution At the same time, E can relax the adjacent nodes Third questions to determine the problem (1 points for each question 5 questions, a total of 5 points) 1, AB A said the moment distribution coefficient of node function unit couple, AB lever A is sharing the rod end moment. Correct 2, the moment distribution method are derived based on the displacement method, so the structure can be calculated using displacement method can be calculated by the method of moment distribution. error 3, in the moment distribution method, non adjacent nodes can also relax. Correct Scope 4, moment distribution method is continuous beam and non sway frame. Correct The end of 5, at a bar of the nodal moment distribution coefficient equals 1. Correct "The test of structural mechanics" chapter 09 Online The first question, multiple-choice questions (1 points for each question 5 questions, a total of 5 points) 1, when the harmonic loads for the single degree of freedom system with the particle damping, if the load frequency is far greater than the natural frequency of the system, and then the dynamic load balance is mainly D, inertial force 2, when the harmonic loads for the single degree of freedom system without damping on the particle, if the load frequency is far less than the natural frequency of the system, and then the dynamic load balance is mainly A A, the elastic restoring force 3, a single degree of freedom vibration system, the damping ratio zeta, dynamic coefficient, resonance when the following results are correct A, f = 0.05, P = 10 4, a single degree of freedom system, the initial displacement of 0.685cm, the initial velocity is zero free vibration, vibration of a cycle after the maximum displacement is 0.50cm, the damping ratio for the system A, 0.05 In 5, low damping system can not be ignored the influence of damping on what? C, the free vibration amplitude Second questions, multiple choice questions (2 points for each question 5 questions, a total of 10 points) 1, a simple point motor, in order to improve the vibration frequency of the beam, the following measures are correct A, shorten the span B, increasing section C, the end of the beam to the fixed end D, reduced quality E, the motor speed increases 2, the free vibration of multi degree of freedom system of the main calculation ABC A, frequency B, cycle C, mode D, dynamic force E, dynamic displacement 3, a single degree of freedom vibration system, dynamic coefficient and damping ratio when the resonance may be AC a、ξ,0.05, β,10 b、ξ,0.1, β,15 c、ξ,0.15, β,20 d、ξ,0.2, β,25 e、ξ,0.04, β,12.5 4、结构的振型与什么有关? a、质量 b、刚度 c、荷载 d、荷载频率 e、支座移动 5、引起自由振动的原因是 a、初位移 b、初速度 c、瞬时冲量 d、简谐荷载 e、突加荷载 第三 题 快递公司问题件快递公司问题件货款处理关于圆的周长面积重点题型关于解方程组的题及答案关于南海问题 、判断题 (每题1分, 5道题共5分) 1、结构的自振频率与质量、刚度及荷载有关. 错误 2、将一重物突然放在梁上, 重物将围绕着静力平衡位置作简谐振动, 并且β,2. 正确 3、在简谐荷载作用下, 考虑不考虑阻尼影响, 位移总是与荷载同步. 错误 4、动力系数β也称为动力放大系数, 它总是大于1的. 错误 5、无阻尼单自由度体系在简谐荷载作用下, β绝对值随θ / ω的增大而增大. 错误