MIDAS钢栈桥模型建立流程

北京迈达斯技术有限公司栈桥分析目录栈桥分析·····································································································1 1、工程概况·······························································································1 2、定义材料和截面···················································································2 定义钢材的材料特性··················································································2 定义截面·····································································································2 3、建模·······································································································4 建立第一片贝雷片·····················································································4 建立其余的贝雷片·····················································································8 建立支撑架·································································································9 建立分配梁·······························································································12 4、添加边界·····························································································17 添加弹性连接···························································································17 添加一般连接···························································································19 释放梁端约束···························································································22 5、输入荷载·····························································································22 添加荷载工况···························································································22 6、输入移动荷载分析数据······································································23 定义横向联系梁组···················································································23 定义移动荷载分析数据············································································23 输入车辆荷载···························································································24 移动荷载分析控制···················································································26 7、运行结构分析·····················································································27 8、查看结果·····························································································27 生成荷载组合···························································································27 查看位移···································································································28 查看轴力···································································································29 利用结果表格查看应力············································································30 1栈桥分析1、工程概况一座用贝雷片搭建的施工栈桥，跨径15m（5片贝雷片），支承条件为简支，桥面宽6米。设计荷载汽—20，验算荷载挂—50。贝雷片的横向布置为5×90cm，共6片主梁，在贝雷片主梁上布置I20a分配梁，位置作用于贝雷片上弦杆的每个节点处，间距约75cm。如下图所示：贝雷片参数：材料16Mn；弦杆2I10a槽钢（C100x48x5.3/8.5，间距8cm），腹杆I8(h=80mm,b=50mm,tf=4.5mm,tw=6.5mm)。贝雷片的连接为销接。图1贝雷片计算图示（单位：mm）支撑架参数：材料A3钢，截面L63X4。分配横梁参数：材料A3钢，截面I20a，长度6m。2建模要点：贝雷片主梁用梁单元，销接释放绕梁端y-y轴的旋转自由度；支撑架用桁架单元；分配横梁用梁单元，与贝雷主梁的连接采用节点弹性连接（仅连接平动自由度，旋转自由度不连接）；车道布置一个车道，居中布置。2、定义材料和截面定义钢材的材料特性模型/材料和截面特性/材料/添加材料号：1类型钢材；规范：JTJ(S)数据库16Mn（适用）材料号：2类型钢材；规范：JTJ(S)数据库A3确认定义截面注：midas/Civil的截面库中含有丰富的型钢截面，同时还拥有强大的截面自定义功能。模型/材料和截面特性/截面/添加数据库/用户截面号1；名称：（弦杆）截面类型：（双槽钢截面）选择用户定义，数据库名称（GB-YB）；截面名称：C100x48x5.3/8.5C：（80mm）点击适用3截面号2；名称：（腹杆）截面类型：（工字形截面）选择用户定义H：（80mm）B1：（50mm）tw：（6.5mm）tf1：（4.5mm）点击适用截面号3；名称：（支撑架）截面类型：（角钢）数据库：（GB-YB）截面：（L63x4）点击适用截面号4；名称：（分配梁）截面类型：（工字形截面）数据库：（GB-YB）截面：（I200x100x7/11.4）偏心：（中上部）↵43、建模注：对于直线单元，使用midasCivil特有的扩展功能可以快速地建立模型。另，对于钢结构，要善于使用扩展、移动和复制、旋转等功能快速建模。建立第一片贝雷片生成上下弦杆模型节点建立节点坐标（0，0，0）模型单元扩展单元全选扩展类型节点-线单元单元类型梁单元；材料1:16Mn；截面1：弦杆生成形式复制和移动复制和移动任意间距：方向（x）间距（90，4@705，90）mm↵5模型单元复制和移动全选形式复制等间距dx,dy,dz（0，0，1400）mm复制次数（1）↵6生成竖杆模型单元扩展单元选择节点2扩展类型节点-线单元单元类型梁单元；材料1:16Mn；截面2：腹杆复制和移动等间距dx,dy,dz（0，0，700）mm复制次数（2）↵模型单元复制和移动选择最新建立的个体形式复制等间距dx,dy,dz（1410，0，0）mm复制次数（2）↵7生成斜杆模型单元建立单元类型一般梁/变截面梁；材料1:16Mn；截面2：腹杆节点连接：依次连接节点（15，10），（10，16），（16，3），（3，15）（16，12），（12，17），（17，5），（5，16）生成斜杆（如图所示）8建立其余的贝雷片模型单元复制和移动全选形式复制等间距dx,dy,dz（3000，0，0）mm复制次数（4）↵（生成1根贝雷片主梁）模型单元复制和移动全选形式复制等间距dx,dy,dz（0，900，0）mm复制次数（5）↵（生成另外5根贝雷片主梁）9建立支撑架建立一联支撑架点击图标菜单平面选择，选择yz平面，x坐标处输入0适用，或用鼠标在图形窗口中点击x=0的任意一个节点，则x=0这个平面被选择，点击图标菜单激活，则在窗口仅显示刚刚选择的x=0平面内的节点和单元。10转换视图为侧视图，如下图所示，依次连接节点，生成两片主梁间的支撑架模型单元建立单元类型桁架单元；材料2:A3；截面3：支撑架模型单元复制和移动11选择刚才生成的支撑架单元形式复制等间距dx,dy,dz（0，900，0）mm复制次数（4）↵模型检查结构数据检查并删除重复输入的单元（删除刚才支撑架复制重叠的单元）注：对于钢结构模型，由于单元较多，容易生成重复单元。因此，建完模型后，建议使用检查功能，删除重叠的单元，以确保分析的正确性。（其他结构的分析也建议在分析前执行检查的操作）建立其余的支撑架全部激活所有单元在树形菜单鼠标左键双击截面3:支撑架，则刚刚建立的支撑架单元被选择12模型单元复制和移动形式复制等间距dx,dy,dz（3000，0，0）mm复制次数（5）↵建立分配梁13切换到正面视图，窗口选择x=0的构件，然后激活模型节点复制和移动选择节点8形式复制等间距dx,dy,dz（0，-750，200）mm复制次数（1）↵模型单元扩展单元选择最新建立的个体（快速选中刚才生成的节点）扩展类型节点-线单元单元类型梁单元；材料2:A3；截面4：分配梁复制和移动任意间距：方向（y）间距（750，5@900，750）mm↵（生成第一根分配梁）14使用选择新建项目选择刚才生成的分配梁模型单元复制和移动（使用复制功能建立余下的分配梁）形式复制任意间距：方向（x）间距（795，3@705，885，3@705，885，3@705，885，3@705，885，3@705）mm↵15建立桥面板利用分配梁单元建立桥面板，选择分配梁并激活（可以使