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1、目录一.文件名及前处理模式3二.截面的建立31.主梁截面32.桥塔截面31三.定义单元属性32四.建立主要节点和单元331.主梁节点和单元332.桥塔节点和单元403.斜拉索节点和单元414.鱼刺骨模型模拟斜拉索与主梁连接42五.加载与求解441.施加边界条件442.施加自重和公路一级荷载44六.动力特性441.前十阶模态自振频率442.前五阶振型图45一.文件名及前处理模式定义工作文件名与工作标题,并进入前处理模式(PREP7):/FILNAME,BRIDGE,1!定义工作文件名/TITLE,ZH
2、ANGHAONAN’SHOMEWORK!定义工作标题/REPLOT!重新显示/PREP7!进入PREP7处理器二.截面的建立1.主梁截面根据本桥图纸,截面一共有32个,其中包括截面纵向变化与横向变化,为简化模型,减小工作量,选取其中11个截面作为分析对象,可以大致上反应桥梁的形态,从左到右选取图纸中的截面:截面1:左边跨直线段截面截面8:4号墩墩顶截面截面11:截面第一次横向变化(39M—43M)起始截面截面14:截面第一次横向变化(39M—43M)结束截面截面16:主跨跨中截面截面22:截面第二次
3、横向变化(43M—45M)起始截面截面24:截面第二次横向变化(43M—45M)结束截面截面25:5号墩墩顶截面截面27:截面第二次横向变化(45M—39M)起始截面截面31:截面第二次横向变化(45M—39M)结束截面截面32:6号墩墩顶截面由于截面形式复杂,而变截面需要前后两端的拓扑一致,即两端的形状,线与线的关系必须一致,两端截面的节点能一一对应,不使用辅助软件的条件下,必须对这些截面在输入时进行划分,取单元形状为四边形,方向为逆时针,并定义梁截面为MESH(自定义截面),截面偏移为梁节点偏移
4、至横截面圆点。命令流如下:(1)截面1:K,1,19.5,-0.39$K,2,18,-0.36$K,3,18,-0.65K,4,19.5,-0.65$K,5,-19.5,-0.65$K,6,-18,-0.65K,7,-18,-0.36$K,8,-19.5,-0.39$K,9,18,-0.36K,10,17.15,-0.343$K,11,17.15,-0.843$K,12,18,-0.65K,13,-18,-0.65$K,14,-17.15,-0.843$K,15,-17.15,-0.343K,16,
5、-18,-0.36$K,17,17.15,-0.343$K,18,16.65,-0.333K,19,16.65,-0.843$K,20,17.15,-0.843$K,21,-17.15,-0.843K,22,-16.65,-0.843$K,23,-16.65,-0.333$K,24,-17.15,-0.343K,25,16.65,-0.333$K,26,15.65,-0.313$K,27,15.65,-0.573K,28,16.65,-0.833$K,29,-16.65,-0.833$K,30,-1
6、5.65,-0.573K,31,-15.65,-0.313$K,32,-16.65,-0.333$K,33,15.65,-0.313K,34,12.45,-0.249$K,35,12.45,-0.509$K,36,15.65,-0.573K,37,-15.65,-0.573$K,38,-12.45,-0.509$K,39,-12.45,-0.249K,40,-15.65,-0.313$K,41,12.45,-0.249$K,42,11.45,-0.229K,43,11.45,-0.729$K,44,
7、12.45,-0.509$K,45,-12.45,-0.509K,46,-11.45,-0.729$K,47,-11.45,-0.229$K,48,-12.45,-0.249K,49,11.45,-0.229$K,50,10.95,-0.219$K,51,10.95,-0.719K,52,11.45,-0.729$K,53,-11.45,-0.729$K,54,-10.95,-0.719K,55,-10.95,-0.219$K,56,-11.45,-0.229$K,57,10.95,-0.219K,
8、58,9.95,-0.199$K,59,9.95,-0.459$K,60,10.95,-0.719K,61,-10.95,-0.719$K,62,-9.95,-0.459$K,63,-9.95,-0.199K,64,-10.95,-0.219$K,65,9.95,-0.199$K,66,6.85,-0.137K,67,6.85,-0.397$K,68,9.95,-0.459$K,69,-9.95,-0.459K,70,-6.85,-0.397$K,71,-6.85,-