1、Ansys 课程设计一、 任务说明书以 64m 双线铁路栓焊下承桁梁为研究对象,利用 ansys 建模分析该钢桁桥在各种工况作用下的变形和强度,验证其 设计的合理性。该桥采用 TBJ2-85 铁路桥涵设计规范进行设计,铁路列车竖向活载为“中-活载“,钢梁主体结构采用16Mnq,高强度螺栓采用 20MnTiB(螺帽及垫圈用 45 号钢) 。该桥的设计轮廓图分别如图 1、图 2 和图 3 所示。图 1 上平纵联图 2 主桁图 3 下平纵联二、 概述Ansys 建模采用自底向上的实体建模,即先定义关键点,然后在关键点的基础上连接成线,之后在初步形成的图形上划分网格,生成节点和单元,并定义截面类型,即
2、可得到有限元模型。由于本人是通过文本命令流建模,出于单元编号的有序性考虑,本文没有选择先建立半桥模型然后对称映像成全桥模型,而是直接建立全桥模型。模型的简化:1.各杆件连接简化为刚接 2.桥门架结构省略 3.活载按中活载平均后均布加载文本命令流的主要顺序:1. 定义单元属性:A.单元类型:本文所有杆件均采用 beam44。对 beam44 的简要介绍:单轴单元,具有抗拉、抗压、抗扭、抗弯能力;有六个自由度;允许节点偏离形心;仅适合处理线性问题。而本设计只要求结构在静力荷载下的反应,线性单元就已满足要求。允许节点偏离形心使我们可以在设置截面属性时就可解决实际结构各杆件连接处形心不重合问题,所以选
3、用 beam44 非常合适。B.材料属性:刚材的属性为 , , 。Pa1e*.2xE3.03mkg7850C.截面属性:共定义定义了 13 种横截面形式,为解决实际结构各杆件连接处形心不重合问题,我们假设各单元连接处形心重合,但定义的形心偏离实际形心,即自定义截面形心。2.生成实体模型。按点、线的顺序生成。考虑到后处理时,分别对横梁、纵梁、桁架进行分析,所以点线编号也按此顺序进行。3.划分单元。本文中按 1 米的间隔划分单元, ,一共得到了 1410 个单元、2704 个节点。划分单元的注意点:定义梁截面的方向时,是在局部坐标系下定义的,通过定义第三个参考点 k 与 I、J 确定一个平面,即为
4、 x-z 平面,I 到 J 代表 x 轴,z轴的方向与 k 点相近,y 轴由右手定则的出。所以在划分单元时,对每个线都定义了参考点。4.施加荷载1.约束:模型的位移约束均加在下弦杆的四个关键点上,其中一个空间固定铰支座、两个平面固定铰支座、一个活动铰支座。2.荷载本文定义了五种荷载工况,各荷载工况如下:工况一:恒载(通过 y 设置加速度 9.8N/kg)工况二:恒载+全桥满布;工况三:恒载+同侧半桥满布;工况四:自恒载重+全桥单线;工况五:恒载+异侧半桥满布。其中恒载包括自重和二恒,自重加速度为:9.8 N/,二恒为枕木荷载:2t/线/m。根据“中-活载”得到的线均布荷载为: mN/1072.
5、462*645.30830925 3本文实际加载时,活载按工况单独加载,并没有与恒载一起作用,得出数据后,再自己叠加。三、Ansys 模型的建立与求解3.1 有限元建模及网格划分(前处理)3.1.1 选择单元属性/title, a simple bridge/prep7ET,1,BEAM44 !定义单元类型mp,ex,1,210e9 !定义材料mp,prxy,1,0.3mp,dens,1,7850SECTYPE, 1, BEAM, HREC, rsc1, 1 !定义截面 SECOFFSET, CENT SECDATA,0.62,0.46,0.016,0.016,0.020,0.020,0,0,
6、0,0 SECTYPE, 2, BEAM, I, vc2, 1 SECOFFSET, user,0,0.23 SECDATA,0.42,0.42,0.46,0.016,0.012,0.01,0,0,0,0 SECTYPE, 3, BEAM, I, lsc3, 1 SECOFFSET, CENT SECDATA,0.46,0.46,0.46,0.02,0.02,0.016,0,0,0,0 SECTYPE, 4, BEAM, HREC, rcs4, 1 SECOFFSET, CENT SECDATA,0.46,0.46,0.012,0.012,0.012,0.012,0,0,0,0 SECTYPE
7、, 5, BEAM, I, lsc5, 1 SECOFFSET, CENT SECDATA,0.46,0.46,0.46,0.016,0.016,0.01,0,0,0,0 SECTYPE, 6, BEAM, I, 6, 0 SECOFFSET, CENT SECDATA,0.600,0.600,0.460,0.016,0.016,0.012,0,0,0,0 SECTYPE, 7, BEAM, I, 7, 0 SECOFFSET, CENT SECDATA,0.600,0.600,0.460,0.024,0.024,0.020,0,0,0,0 SECTYPE, 8, BEAM, I, 8, 0
8、SECOFFSET, CENT SECDATA,0.6,0.6,0.46,0.032,0.032,0.024,0,0,0,0 SECTYPE, 9, BEAM, I, upp9, 0 SECOFFSET, CENT SECDATA,0.3,0.3,0.42,0.01,0.01,0.01,0,0,0,0 SECTYPE, 10, BEAM, I, ups, 0 SECOFFSET, CENT SECDATA,0.23,0.23,0.42,0.01,0.01,0.01,0,0,0,0 SECTYPE, 11, BEAM, I, dowp11, 0 SECOFFSET, USER, 0, 1.67S
9、ECDATA,0.38,0.27,1.97,0.032,0.032,0.016,0,0,0,0SECTYPE, 12, BEAM, I, does12, 0 SECOFFSET, centSECDATA,0.23,0.23,0.42,0.01,0.01,0.01,0,0,0,0 SECTYPE, 13, BEAM, I, longi13, 0 SECOFFSET, user,0,1.67SECDATA,0.24,0.24,1.29,0.016,0.016,0.01,0,0,0,0 3.1.2 定义关键点、线*do ,j,1,9,1 !生成横梁关键点k,j,(j-1)*8,0,0*enddo*d
10、o ,j,1,9,1k,j+9,(j-1)*8,0,-1.866*enddo*do ,j,1,9k,j+18,(j-1)*8,0,-3.866*enddo*do ,j,1,9k,j+27,(j-1)*8,0,-5.866*enddo*do ,j,1,9k,j+36,(j-1)*8,0,-7.866*enddo*do ,j,1,9k,j+45,(j-1)*8,0,-9.732*enddo*do ,j,1,8 !生成纵梁线 132l,j+9,j+10*enddo*do, j,1,8l,j+18,j+19*enddo*do, j,1,8l,j+27,j+28*enddo*do ,j,1,8l,j+3
11、6,j+37*enddo*do, j1,1,9 !生成横梁线 3377*do ,j,1,5l,j1+(j-1)*9,j1+j*9*enddo*enddo*do,j,1,8 !生成下弦杆 8693l,j,j+1*enddo*do,j,1,8l,j+45,j+46*enddo*GET,dian1,kp,NUM,MAX !生成上弦杆 dian5561,x9499*do,j,1,7k,dian1+j,j*8,11,0*enddo*do,j,1,6l,dian1+j,dian1+j+1*enddo*do,j,1,7 !生成腹杆 100106l,j+1,j+54*enddo*do,j,1,4 !生成腹杆
12、107114l,j*2-1,j*2+53l,j*2+53,j*2+1*enddo*GET,dian2,kp,NUM,MAX !生成上弦杆 115120*do,j,1,7k,dian2+j,j*8,11,-9.732*enddo*do,j,1,6l,dian2+j,dian2+j+1*enddo*do,j,1,7 !生成腹杆 121127l,j+46,j+61*enddo*do,j,1,4 !生成斜腹杆 128135l,j*2+44,j*2+60l,j*2+60,j*2+46*enddo*do,j,1,8 !生成下平联杆中点 6976k,68+j,8*j-4,0,-4.866*enddo*do,
13、j,1,8 !生成下平联杆 136151l,j,j+68l,j+68,j+46*enddo*do,j,1,8 !生成下平联杆 152167l,45+j,68+jl,68+j,1+j*enddo*do,j,1,6 !生成上平联杆中点 7782k,76+j,8*j+4,11,-4.866*enddo*do,j,1,6 !生成上平联杆 168179l,j+54,j+76l,j+76,j+62*enddo*do,j,1,6 !生成下平联杆 180191l,61+j,76+jl,76+j,55+j*enddo*do,j,1,7 !生成上平直杆 192198l,54+j,61+j*enddo3.1.3 分
14、配单元属性、网格划分*get,dian3,kp,num,max !mesh 纵梁k,dian3+1,0,-2,-1.866lsel,s,line,1,8LATT,1,1,dian3+1,13LESIZE,ALL,1LMESH,ALL *get,dian3,kp,num,maxk,dian3+1,0,-2,-3.866lsel,s,line,9,16LATT,1,1,dian3+1,13LESIZE,ALL,1LMESH,ALL *get,dian3,kp,num,maxk,dian3+1,0,-2,-5.866lsel,s,line,17,24LATT,1,1,dian3+1,13LESIZE
15、,ALL,1LMESH,ALL *get,dian3,kp,num,maxk,dian3+1,0,-2,-7.866lsel,s,line,25,32LATT,1,1,dian3+1,13LESIZE,ALL,1LMESH,ALL *do, j1,1,9 !mesh 横梁线 3377*get,dian3,kp,num,maxk,dian3+1,8*(j1-1),-2,0lsel,s,line,28+j1*5,32+j1*5LATT,1,1,dian3+1,11LESIZE,ALL,1LMESH,ALL *enddo *get,dian3,kp,num,maxk,dian3+1,-8,0,-11
16、lsel,s,line,78 !mesh 下弦杆LATT,1,1,dian3+1,6LESIZE,ALL,1LMESH,ALL lsel,s,line,79,80 !mesh 下弦杆LATT,1,1,dian3+1,7LESIZE,ALL,1LMESH,ALL lsel,s,line,81 !mesh 下弦杆LATT,1,1,dian3+1,8LESIZE,ALL,1LMESH,ALLlsel,s,line,82 !mesh 下弦杆LATT,1,1,dian3+1,8LESIZE,ALL,1LMESH,ALL lsel,s,line,83,84 !mesh 下弦杆LATT,1,1,dian3+
17、1,7LESIZE,ALL,1LMESH,ALL lsel,s,line,85 !mesh 下弦杆LATT,1,1,dian3+1,7LESIZE,ALL,1LMESH,ALL lsel,s,line,86 !mesh 下弦杆LATT,1,1,dian3+1,6LESIZE,ALL,1LMESH,ALL lsel,s,line,87,88 !mesh 下弦杆LATT,1,1,dian3+1,7LESIZE,ALL,1LMESH,ALL lsel,s,line,89 !mesh 下弦杆LATT,1,1,dian3+1,8LESIZE,ALL,1LMESH,ALLlsel,s,line,90 !m
18、esh 下弦杆LATT,1,1,dian3+1,8LESIZE,ALL,1LMESH,ALL lsel,s,line,91,92 !mesh 下弦杆LATT,1,1,dian3+1,7LESIZE,ALL,1LMESH,ALL lsel,s,line,93 !mesh 下弦杆LATT,1,1,dian3+1,7LESIZE,ALL,1LMESH,ALL *get,dian3,kp,num,maxk,dian3+1,-8,11,-11lsel,s,line,94,95 !mesh 上弦杆LATT,1,1,dian3+1,7LESIZE,ALL,1LMESH,ALL lsel,s,line,96,
19、97 !mesh 上弦杆LATT,1,1,dian3+1,8LESIZE,ALL,1LMESH,ALL lsel,s,line,98,99 !mesh 上弦杆LATT,1,1,dian3+1,7LESIZE,ALL,1LMESH,ALLk,dian3+1,-8,11,-11lsel,s,line,115,116 !mesh 上弦杆LATT,1,1,dian3+1,7LESIZE,ALL,1LMESH,ALL lsel,s,line,117,118 !mesh 上弦杆LATT,1,1,dian3+1,8LESIZE,ALL,1LMESH,ALL lsel,s,line,119,120 !mesh
20、 上弦杆LATT,1,1,dian3+1,7LESIZE,ALL,1LMESH,ALLlsel,s,line,107 !mesh 斜腹杆LATT,1,1,62,1LESIZE,ALL,1LMESH,ALL lsel,s,line,108 !mesh 斜腹杆LATT,1,1,62,3LESIZE,ALL,1LMESH,ALL lsel,s,line,109 !mesh 斜腹杆LATT,1,1,64,4LESIZE,ALL,1LMESH,ALLlsel,s,line,110 !mesh 斜腹杆LATT,1,1,64,5LESIZE,ALL,1LMESH,ALL lsel,s,line,111 !m
21、esh 斜腹杆LATT,1,1,66,5LESIZE,ALL,1LMESH,ALL lsel,s,line,112!mesh 斜腹杆LATT,1,1,66,4LESIZE,ALL,1LMESH,ALLlsel,s,line,113!mesh 斜腹杆LATT,1,1,68,3LESIZE,ALL,1LMESH,ALL lsel,s,line,114!mesh 斜腹杆LATT,1,1,68,1LESIZE,ALL,1LMESH,ALLlsel,s,line,128 !mesh 斜腹杆LATT,1,1,55,1LESIZE,ALL,1LMESH,ALL lsel,s,line,129 !mesh 斜
22、腹杆LATT,1,1,55,3LESIZE,ALL,1LMESH,ALL lsel,s,line,130 !mesh 斜腹杆LATT,1,1,57,4LESIZE,ALL,1LMESH,ALLlsel,s,line,131 !mesh 斜腹杆LATT,1,1,57,5LESIZE,ALL,1LMESH,ALL lsel,s,line,132 !mesh 斜腹杆LATT,1,1,59,5LESIZE,ALL,1LMESH,ALL lsel,s,line,133!mesh 斜腹杆LATT,1,1,59,4LESIZE,ALL,1LMESH,ALLlsel,s,line,134!mesh 斜腹杆LA
23、TT,1,1,61,3LESIZE,ALL,1LMESH,ALL lsel,s,line,135!mesh 斜腹杆LATT,1,1,61,1LESIZE,ALL,1LMESH,ALLlsel,s,line,100 !mesh 直腹杆LATT,1,1,62,2LESIZE,ALL,1LMESH,ALL lsel,s,line,101 !mesh 直腹杆LATT,1,1,63,2LESIZE,ALL,1LMESH,ALL lsel,s,line,102 !mesh 直腹杆LATT,1,1,64,2LESIZE,ALL,1LMESH,ALLlsel,s,line,103 !mesh 直腹杆LATT,
24、1,1,65,2LESIZE,ALL,1LMESH,ALL lsel,s,line,104 !mesh 直腹杆LATT,1,1,66,2LESIZE,ALL,1LMESH,ALL lsel,s,line,105!mesh 直腹杆LATT,1,1,67,2LESIZE,ALL,1LMESH,ALLlsel,s,line,106!mesh 直腹杆LATT,1,1,68,2LESIZE,ALL,1LMESH,ALL !lsel,s,line,121 !mesh 直腹杆LATT,1,1,55,2LESIZE,ALL,1LMESH,ALL lsel,s,line,122 !mesh 直腹杆LATT,1,
25、1,56,2LESIZE,ALL,1LMESH,ALL lsel,s,line,123 !mesh 直腹杆LATT,1,1,57,2LESIZE,ALL,1LMESH,ALLlsel,s,line,124!mesh 直腹杆LATT,1,1,58,2LESIZE,ALL,1LMESH,ALL lsel,s,line,125 !mesh 直腹杆LATT,1,1,59,2LESIZE,ALL,1LMESH,ALL lsel,s,line,126!mesh 直腹杆LATT,1,1,60,2LESIZE,ALL,1LMESH,ALLlsel,s,line,127!mesh 直腹杆LATT,1,1,61,
26、2LESIZE,ALL,1LMESH,ALLallsel*get,xian1,line,num,max*get,dian3,kp,num,maxk,dian3+1,0,11,-11lsel,s,line,xian1-6,xian1 !mesh 上平直杆LATT,1,1,dian3+1,9LESIZE,ALL,1LMESH,ALL*do,j,1,6lsel,s,line,166+2*j,167+2*j,1 !mesh 上平斜杆LATT,1,1,55+j,10LESIZE,ALL,1LMESH,ALLlsel,s,line,178+2*j,179+2*j,1 !mesh 上平斜杆LATT,1,1,
27、54+j,10LESIZE,ALL,1LMESH,ALL*enddo*do,j,1,8lsel,s,line,134+2*j,135+2*j,1 !mesh 下平斜杆LATT,1,1,1+j,10LESIZE,ALL,1LMESH,ALLlsel,s,line,150+2*j,151+2*j,1 !mesh 下平斜杆LATT,1,1,j,10LESIZE,ALL,1LMESH,ALL*enddo3.2 施加载荷、位移边界条件及求解3.2.1 定义位移约束dk,1,ux,0,0,uy,uz !定义约束dk,46,uy,0,0,uxdk,9,uy,0,0,uzdk,54,uy,0,0finish3
28、.22 工况一恒载作用下桥梁结构分析(一恒二恒)/SOLU acel,0,9.8,0 !自重esel,s,sec,13 !二恒sfbeam,all,1,pres,-9800allselsolvefinish3.2.2 活载(全桥满布)作用下桥梁结构分析/prep7esel,s,sec,13sfbeam,all,1,pres,-46718.75allsel/SOLU Solve!说明:各荷载加载都是对于仅有位移约束,无荷载的结构上进行的,即荷载加载命令流并不连续。3.2.3 活载(全桥单线)作用下桥梁结构分析/prep7esel,s,elem,1,128sfbeam,all,1,pres,-46
29、718.75allsel/SOLU Solve3.2.4 活载(半桥同侧满布)作用下桥梁结构分析/prep7esel,s,elem,1,32esel,a,elem,65,96esel,a,elem,129,160esel,a,elem,193,224sfbeam,all,1,pres,-46718.75allsel/SOLU Solve3.2.5 活载(半桥异侧满布)作用下桥梁结构分析/prep7allselesel,s,elem,1,32esel,a,elem,65,96esel,a,elem,161,192esel,a,elem,225,256sfbeam,all,1,pres,-4671
30、8.75allsel/SOLU Solve3.3 求解结果(后处理)3.3.1 后处理命令3.3.1.1 结构整体挠曲图Post1/PLDISP,2 3.3.1.2 主梁角点应力图/post1esel,s,sec,11,13,2etable,l1,ls,1 etable,l6,ls,6 etable,l2,ls,2 etable,l7,ls,7 etable,l3,ls,3 etable,l8,ls,8 etable,l4,ls,4 etable,l9,ls,9 etable,l5,ls,5 etable,l10,ls,10PRETAB,l1,l2,l3,l4,l5,l6,l7,l8,l9 P
31、RETAB,l10说明:生成的数据通过复制粘贴到 excel 表中,在进行处理3.3.1.3 纵梁挠曲图esel,s,elem,1,256nsel,s,ext,1,256prnsol,u,y3.3.1.4 横梁挠曲图esel,s,elem,257,346nsel,s,ext,257,346prnsol,u,y3.3.1.5 主桁架内力图/post1esel,s,sec,1,8etable,t1,smisc,1 etable,t2,smisc,2 etable,t3,smisc,3 etable,t4,smisc,4 etable,t5,smisc,5 etable,t6,smisc,6 eta
32、ble,t7,smisc,7 etable,t8,smisc,8 etable,t9,smisc,9 etable,t10,smisc,10 etable,t11,smisc,11 etable,t12,smisc,12 PRETAB,T1,T2,T3,T4,T5,T6,T7,T8,T9 PRETAB,T10,t11,t123.3.2 图表结果说明(以恒载工况为例)3.3.2.1 整体变形图3.3.2.2 角点应力图 zy1234按道理结构在对称荷载下的应力图也是对称的,可实际并不对称,如图 3.313.31由于在有横梁的地方内力是突变的,而显示的单元应力只是单元 i 节点的,所以左半部分并不
33、能显示有横梁处的突变应力,因此本人将 I,j,节点显示在一张图中,如图。3.32求主梁的应力的目的是找出最大值,故我将四角点的应力最值显示在一张图中,如图 3.3-33.3-3图 3.3-4 为横梁角点应力图,我将 9 根横梁放在一张图表中,每 10 米代表一根横梁,以作对比,、3.3-43.3.2.3 纵梁挠曲图因为通过节点的位移表示,而节点排序并不是按顺序的,所以本人通过单元与节点的对应映射,使节点排列按纵梁的走向分布。如图 3.3-53.3-53.3.2.4 横梁挠曲图本人将九根横梁显示在一张图中,每 10 米代表一根横梁,如图 3.3-63.3-63.3.2.5 主桁架内力杆件编号如图
34、 3.3-7,3.3-83.3-73.3-8ELEM 轴力 i y 向力 i z 向力 i Mxi Myi Mzi347 6.71E+05 3345.4 8092.4 -2.0926 -40077 -11179348 6.51E+05 6321.7 4976.3 -0.29926 -19442 -13781349 1.46E+06 12968 3631.6 5.2371 -17545 12453350 1.47E+06 11180 127.07 -11.408 -1522.5 -8755.2351 1.47E+06 18336 -165.5 11.461 -385.83 19900352 1.
35、47E+06 9956.6 -3645.8 -5.1882 11606 239.47353 6.53E+05 15969 -5059.3 -0.72623 20772 25968354 6.94E+05 16441 -8986.8 7.7645 28786 29241355 6.70E+05 3347.1 -8089.5 2.0982 40057 -11168356 6.50E+05 6323.5 -4974.8 0.30283 19432 -13772357 1.46E+06 12968 -3631 -5.2327 17538 12452358 1.47E+06 11180 -126.88
36、11.401 1519 -8753.9359 1.47E+06 18335 165.38 -11.466 383.76 19896360 1.47E+06 9956.1 3645.7 5.1819 -11607 238.26361 6.53E+05 15968 5059.3 0.7194 -20773 25963362 6.94E+05 16441 8984.8 -7.7734 -28782 29237363 -1.30E+06 17151 -894.85 -16.977 4733.7 40006364 -1.31E+06 10779 311.46 15.965 -1798 1466.5365
37、 -1.76E+06 17575 -127.57 -36.368 614.81 19345366 -1.76E+06 11902 126.91 36.37 -405.31 -3323.8367 -1.31E+06 12011 -303.8 -15.954 680.05 6375.4368 -1.31E+06 5626.8 846.71 18.461 -2344.4 -6044.6369 -1.30E+06 17151 896.23 16.97 -4742.2 40008370 -1.31E+06 10778 -311.82 -15.966 1799.3 1465.2371 -1.76E+06
38、17575 127.59 36.384 -614.72 19349372 -1.76E+06 11902 -127.31 -36.35 405.61 -3325.1373 -1.31E+06 12011 303.82 15.967 -678.78 6377.2374 -1.31E+06 5626.7 -848.48 -18.442 2347.4 -6044.9375 -1.35E+06 4064.5 794.43 5469.6 -8800.6 -49096376 9.73E+05 7352.7 1664.1 -0.45446 -7804.2 15278377 -5.64E+05 5018.3
39、-856.5 1239.9 6843.1 -1215.2378 2.19E+05 5753.4 1204.5 -0.89587 -6365.2 11075379 2.02E+05 5940.1 -1205.7 0.89352 10029 12351380 -5.44E+05 8245.4 854.66 -1235.7 -4803.1 20642381 9.49E+05 8117.6 -1555.8 0.71316 14326 20525382 -1.32E+06 19189 -348.51 -4444.8 866.2 56111383 -1.35E+06 -4065.5 795.36 -546
40、3.7 -8803.8 49079384 9.73E+05 -7352.8 1665.2 0.4565 -7808.4 -15278385 -5.64E+05 -5018.2 -857.29 -1240.8 6851.8 1215.7386 2.19E+05 -5753.4 1205 0.8968 -6364.4 -11075387 2.02E+05 -5940 -1206.5 -0.89469 10034 -12351388 -5.44E+05 -8245.4 854.07 1234.7 -4798.1 -20642389 9.49E+05 -8117.5 -1555.5 -0.70975
41、14317 -20525390 -1.32E+06 -19189 -351.81 4436 879.43 -56111391 2.22E+05 -1248.4 -1603.8 0.7398 11231 -8339392 -42011 -1360.9 -3353.5 0.61294 17895 -7434393 2.00E+05 -690.05 -1453.8 0.16037 9350.1 -4068.6394 -49411 0.32876 -3363.8 -1.42E-03 17885 3.6221395 2.00E+05 687.43 -1453 -0.16776 9341.5 4056.7
42、396 -41996 1372.1 -3350 -0.6158 17865 7519.7397 2.29E+05 1163.4 -1533.2 -0.70887 11277 7732.8398 2.22E+05 1248.4 -1604.6 -0.73912 11237 8338.6399 -42011 1360.9 -3354.7 -0.61258 17905 7434400 2.00E+05 690.06 -1455.1 -0.16078 9362.2 4068.7401 -49410 -0.29061 -3364.7 5.86E-04 17892 -3.384402 2.00E+05 -
43、687.41 -1453.2 0.16674 9343.9 -4056.6403 -41996 -1372.1 -3349.3 0.61427 17858 -7519.3404 2.29E+05 -1163.3 -1531.5 0.70787 11261 -7732.4四、结果分析与结论4.1 最大挠度工况一:恒载:f=0.03463m工况二:恒载+全桥满布:f=0.0976m工况三:恒载+全桥单线:f=0.0757m工况四:恒载+同侧半桥满布:f=0.0712m工况五:恒载+异侧半桥满布:f=0.0672m4.2 主梁最大应力4.2.1 纵梁最大正应力:97.3Mpa,工况二纵梁最大负应力:
44、-61.3Mpa,工况二4.2.2 横梁最大正应力:203.9Mpa,工况二横梁最大负应力:-219.2Mpa,工况二4.3 最大挠跨比(除工况一不计恒载)工况一:恒载: 80146/03./ lf工况二:恒载+全桥满布: 5/29.lf工况三:恒载+全桥单线: 193/工况四:恒载+同侧半桥满布: 80764/0. lf工况五:恒载+异侧半桥满布: 325/4.4 最大主桁架内力由于桁架主要受的是轴力,故最大轴力正值为 5031000(工况二)最大轴力负值为-6058600(工况二)4.5 最终结论最大应力 219.2Mpa215MPa,但 变形仍在弹性范围%,59.125.9内。Z 方向的
45、最大位移为 0.0630m, ,满足变形801564/029./ lf要求。验算后,该铁路桥可正常使用。五、附录(各类图表)5.1 工况一:恒载5.1.1 角点应力图5.1.1.1 纵梁角点应力1( 4) 号 纵 梁 角 点 应 力 图-20000000-15000000-10000000-50000000500000010000000150000002000000025000000300000001 3 5 7 9111315171921232527293133353739414345474951535557596163纵 梁 位 置应力值 1号 角 点2号 角 点3号 角 点4号 角 点2
46、( 3) 号 纵 梁 角 点 应 力 图-15000000-10000000-50000000500000010000000150000001 3 5 7 9111315171921232527293133353739414345474951535557596163纵 梁 位 置应力值 1号 角 点2号 角 点3号 角 点4号 角 点5.1.1.2 横梁角点应力图9个 横 梁 角 点 应 力 图-80000000-60000000-40000000-200000000200000004000000060000000800000001 4 7 10131619222528313437404346
47、4952555861646770737679828588横 梁 位 置应力值 1号 角 点2号 角 点3号 角 点4号 角 点5.1.2 主梁挠度图5.1.2.1 纵梁挠度图纵 梁 挠 度 图-1.00E-01-8.00E-02-6.00E-02-4.00E-02-2.00E-020.00E+001 5 9 1317212529333741454953576165纵 梁 位 置挠度值 1( 4) 号 纵 梁2( 3) 号 纵 梁5.1.2.2 横梁挠度图9个 横 梁 挠 度 图-0.03-0.025-0.02-0.015-0.01-0.00501 6 111621263136414651566
48、166717681869196横 梁 位 置挠度值 系 列 15.1.3 整体变形图5.1.4 桁架内力表ELEM 轴力 i y 向力 i z 向力 i Mxi Myi Mzi347 6.71E+05 3345.4 8092.4 -2.0926 -40077 -11179348 6.51E+05 6321.7 4976.3 -0.29926 -19442 -13781349 1.46E+06 12968 3631.6 5.2371 -17545 12453350 1.47E+06 11180 127.07 -11.408 -1522.5 -8755.2351 1.47E+06 18336 -165.5 11.461 -385.83 19900352 1.47E+06 9956.6 -3645.8 -5.1882 11606 239.47353 6.53E+05 15969 -5059.3 -0.72623 20772 25968354 6.94E+05 16441 -8986.8 7.7645 28786 29241355 6.70E+05