Midas 建模专题Bridging Your Innovation to Realityfdggdffdggqddfvg2011/5/18目录1 桥梁概况 .......................................................................................................................................................... - 1 - 1.1主要设计指标 .. (1)1.2相关计算参数 (1)1.3相关设计依据 (1)1.4一般构造及钢束布置 (2)1.4.1 一般构造 ........................................................................................................................................ - 2 -1.4.2 钢束布置 ........................................................................................................................................ - 2 -1.5施工过程 (4)2 建模分析 ........................................................................................................................................................... - 6 - 2.1模型概述 . (6)2.2建模要点 (6)2.2.1 定义材料与截面 ............................................................................................................................ - 6 -2.2.2 定义节点、单元及边界条件........................................................................................................ - 8 -2.2.3 定义时间依存材料特性................................................................................................................ - 9 -2.2.4 定义静力荷载工况 ...................................................................................................................... - 10 -2.2.5 定义预应力荷载 .......................................................................................................................... - 11 -2.2.6 定义移动荷载 .............................................................................................................................. - 12 -2.2.7 定义支座沉降 .............................................................................................................................. - 14 -2.2.8 定义施工阶段 .............................................................................................................................. - 15 -2.2.9 定义结构质量 .............................................................................................................................. - 15 -2.2.10 定义梁的有效宽度 .................................................................................................................... - 16 -2.3分析控制定义 (17)2.3.1 定义施工阶段分析控制.............................................................................................................. - 17 -2.3.2 定义移动荷载分析控制.............................................................................................................. - 17 -2.3.3 定义特征值分析控制 .................................................................................................................. - 17 -2.3.4 定义主控数据 .............................................................................................................................. - 18 -3 结合规范进行设计......................................................................................................................................... - 18 - 3.1定义荷载组合 (18)3.2定义PSC设计 (19)3.2.1 定义PSC设计参数 ........................................................................................................................ - 19 -3.2.2 定义PSC设计材料 ........................................................................................................................ - 19 -3.2.3 定义PSC设计截面位置................................................................................................................ - 19 -3.2.4 定义PSC设计计算书输出内容.................................................................................................... - 19 - 3.3PSC设计结果 (20)3.3.1 正截面抗弯强度验算 .................................................................................................................. - 20 -3.3.2 斜截面抗剪强度验算 .................................................................................................................. - 20 -3.3.3 抗扭强度验算 .............................................................................................................................. - 21 -3.3.4 正截面抗裂验算 .......................................................................................................................... - 21 -3.3.5 斜截面抗裂验算 .......................................................................................................................... - 22 -3.3.6 施工阶段应力验算 ...................................................................................................................... - 22 -3.3.7 受拉区预应力钢筋拉应力验算.................................................................................................. - 22 -3.3.8 正截面压应力验算 ...................................................................................................................... - 23 -3.3.9 斜截面压应力验算 ...................................................................................................................... - 23 -1 桥梁概况1.1 主要设计指标该桥是某一级公路上一座（25m+35m+25m）预应力混凝土等截面连续梁桥，横桥向宽度为12.5m，下部结构采用双柱框架墩，承台接钻孔灌注桩基础。