MIDAS 横向分析

横向分析横向分析1目录横向分析··················································································································································2 概述······················································································································································2 1、横向建模助手·································································································································2 一、模型···························································································································································2 二、荷载···························································································································································3 三、钢束和钢筋················································································································································4 2、移动荷载横向分析·························································································································5 一、 规范 编程规范下载gsp规范下载钢格栅规范下载警徽规范下载建设厅规范下载 ···························································································································································5 二、车道···························································································································································6 三、车辆···························································································································································7 四、移动荷载工况············································································································································8 结语······················································································································································9 横向分析2横向分析概述横向分析是桥梁工程里面针对桥面板，横向预应力，横梁分析等的分析方法。当中在建模助手中，根据桥梁的纵向梁单元模型自动生成横向分析模型的功能。选择纵向模型的任意位置，利用该位置的截面数据自动生成二维横向分析模型。且可以输入作用在横向分析模型的荷载（恒荷载、移动荷载及其它荷载）、定义横向模型的预应力钢筋、普通钢筋。1、横向建模助手一、模型首先根据已经建立的纵梁整体模型，并通过横向建模手的功能，选择需要分析的截面所在的相关单元的I端或者J端并添加，程序会根据具体的截面信息建立该横向的模型。如果是梁格模型，还可以一起生成出来一个整体的横向模型。对于桥梁横向的布置情况，可以根据具体的车道布置情况进行定义，程序中自带的车道横向类型有多种，可以根据实际情况来进行定义。至于支承情况一般可以直接取支撑。如果有分析的需要也可以详细定义弹簧的刚度。横向分析3图1模型的横向布置情况二、荷载在荷载菜单中，可以快速定义各种的荷载工况，包括自重，二期恒载，人行道，中间分隔带等，这些具体荷载的位置在定义模型的横向布置时就已经确定。在移动荷载的分析中，程序可以根据桥面板计算中，影响面积与a和b值来定义，具体的定义方法是，把1/2ab这个参数在桥面上对应的单位的值计算出来，定义在相注：纵向长度一般取单位长，这样可以比较方便计算纵向的影响面积。横向分析4关的系数当中，在程序中叫做影响系数。图2横向分析助手荷载情况三、钢束和钢筋在定义钢束和普通钢筋的菜单中，具体的定义方法与在程序里面定义钢束和钢筋的方法相类似。横向分析5图3横向分析助手钢束与钢筋情况当所有的数据都输入完成后，需要点完成输入，并“导出横向分析模型文件”，这是就可以很快地得到一个横向分析的模型了。以上是通过横向分析建模助手生成一个分析模型的具体步骤，另外还可以手动建模，并定义相关的横向分析荷载进行分析，下面就简单介绍定义横向移动荷载的步骤。2、移动荷载横向分析一、规范横向分析6在进行横向分析前，需要在移动荷载规范里面选择横向移动荷载，这是针对横向分析开发的新的内容。图4选择横向移动荷载二、车道在定义横向车道的时候，可以看到有一个比例系数。在做一个桥面板的分析中，具体的荷载影响面如下图所示，是一个八边型，当中的影响大小由a和b两个值决定，p=P/2ab。图6桥面板影响面横向分析7在定义横向车道的时候，我们就可以根据具体单元所对应的桥面板的位置，把这个1/2ab的值算出来并填到比例系数中。这样模拟出来的是一个多折线的形状，来近似模拟这个八边形行的影响面，对于悬臂版，也是同样的道理，这时就由一个八边形的影响变成一个三角形的影响面，具体的计算方法是一样的。图5横向移动车道三、车辆对于横向分析车辆，具体功能见下图。需要注意的是分布宽度是指纵向的宽度，我们可以取一个单位值1，这是可以比较方便地考虑车道中的比例系数。如果左右车道数量不同，可以通过调整左车道的车道数量来调整。横向分析8图6组合截面的施工阶段联合截面四、移动荷载工况在定义移动荷载工况中，需要手动调整具体的横向折减系数。横向分析9图7移动荷载工况结语本技术资料介绍了软件中关于横向分析建模助手和横向移动荷载分析的相关功能，希望对各工程师在模拟计算这方面有帮助。本文意在说明MIDAS/Civil2006程序的相关功能，所有数据并不代表工程实际情况，仅供读者参考。