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[结构分析] 悬索桥受力分析实例【转】

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发表于 2011-3-11 15:34 | 显示全部楼层 |阅读模式

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  1. /filname,cable,1
  2. keyw,pr_struc,1
  3. /prep7
  4. et,1,link10
  5. et,2,beam3
  6. r,1,1,1e-5
  7. r,2,0.02,1e-5
  8. r,3,0.5,1/24,1
  9. mp,ex,1,25e10
  10. mp,prxy,1,0.1
  11. mp,dens,1,1000
  12. mp,ex,2,30e10
  13. mp,prxy,2,0.1
  14. mp,dens,2,1000
  15. !生成节点
  16. n,1
  17. n,2,10,0.200026668
  18. n,3,20,0.800426758
  19. n,4,30,1.802161037
  20. n,5,40,3.206832495
  21. n,6,50,5.016688905
  22. n,7,60,7.234626423
  23. n,8,70,9.864194224
  24. n,9,80,12.90960018
  25. n,10,90,16.37571758
  26. n,11,100,20.26809296
  27. n,12,10
  28. n,13,20
  29. n,14,30
  30. n,15,40
  31. n,16,50
  32. n,17,60
  33. n,18,70
  34. n,19,80
  35. n,20,90
  36. n,21,100
  37. !生成单元
  38. !生成索单元
  39. *do,i,1,10,1
  40. e,i,i+1
  41. *enddo
  42. !生成吊杆单元
  43. real,2
  44. *do,i,2,10,1
  45. e,i,i+10
  46. *enddo
  47. !生成梁单元
  48. type,2
  49. mat,2
  50. real,3
  51. e,1,12
  52. *do,i,12,20,1
  53. e,i,i+1
  54. *enddo
  55. !生成全桥节点
  56. nsym,x,21,all
  57. esym,,21,all
  58. !合并、压缩节点和单元
  59. asell
  60. nummrg,all
  61. numcmp,all
  62. /replot
  63. !加载与求解
  64. !由于link10是空间单元,所以如果有节点与此单元相连,那么应该对那些节点给与适当的约束,这里应该给与z向约束。悬索为铰约束,大梁为简支
  65. !大梁约束
  66. d,41,,,,,,ux,uy
  67. d,21,uy
  68. !悬索端约束
  69. d,11,,,,,,ux,uy
  70. d,31,,,,,,ux,uy
  71. !link10单元节点设置z向约束
  72. nsel,s,node,,21,42,21
  73. nsel,invert
  74. d,all,uz
  75. allsel
  76. !设定重力场
  77. acel,,10
  78. !运用单元生死模拟悬索的找形和加劲梁的施工过程
  79. !悬索的找形
  80. !牛顿拉普森选项
  81. nropt,full  
  82. !杀死除悬索外的其他单元
  83. esel,s,real,,2
  84. esel,a,real,,3
  85. ekill,all
  86. allsel

  87. !设置求解选项
  88. /solu
  89. nlgeom,on

  90. NSUBST,10,20,5  

  91. time,1  
  92. !设置应力刚化
  93. sstif,on

  94. solve
  95. save,,,,all
  96. !画y向节点位移图,检查悬索是否已达到零位移。(只选活单元)
  97. !esel,s,live
  98. !UPGEOM,1,LAST,LAST,'cable','rst',' '!更新几何形状(使其位移在同侧且较小即可)
  99. !加劲梁的施工模拟
  100. !施工过程为从跨中向两端对称进行,每一个工期左右各架设一段加劲梁(beam3单元)。由于在施工过程中加劲梁各单元之间是铰接的,所以可以把它当作集中荷载作用在悬索上,而这里如直接用激活单元的办法来模拟是不合适的,每段加劲梁的自重W=50000,两端节点各承受25000.只有当加劲梁已经完成安装时,才激活全部单元,从而达到体系转化目的
  101. !中间段梁的架设
  102. f,1,fy,-50000
  103. f,2,fy,-25000
  104. f,22,fy,-25000
  105. !求解
  106. allsel
  107. time,2
  108. solve

  109. !下一阶段
  110. dofsel,s,,fy
  111. fcum,add,1,
  112. dofsel,all
  113. f,2,fy,-25000
  114. f,3,fy,-25000
  115. f,22,fy,-25000
  116. f,23,fy,-25000
  117. time,3
  118. solve

  119. dofsel,s,,fy
  120. fcum,add,1,
  121. dofsel,all
  122. f,3,fy,-25000
  123. f,4,fy,-25000
  124. f,24,fy,-25000
  125. f,23,fy,-25000
  126. time,4
  127. solve

  128. dofsel,s,,fy
  129. fcum,add,1,
  130. dofsel,all
  131. f,5,fy,-25000
  132. f,4,fy,-25000
  133. f,24,fy,-25000
  134. f,25,fy,-25000
  135. time,5
  136. solve

  137. dofsel,s,,fy
  138. fcum,add,1,
  139. dofsel,all
  140. f,5,fy,-25000
  141. f,6,fy,-25000
  142. f,26,fy,-25000
  143. f,25,fy,-25000
  144. time,6
  145. solve

  146. dofsel,s,,fy
  147. fcum,add,1,
  148. dofsel,all
  149. f,7,fy,-25000
  150. f,6,fy,-25000
  151. f,26,fy,-25000
  152. f,27,fy,-25000
  153. time,7
  154. solve

  155. dofsel,s,,fy
  156. fcum,add,1,
  157. dofsel,all
  158. f,7,fy,-25000
  159. f,8,fy,-25000
  160. f,28,fy,-25000
  161. f,27,fy,-25000
  162. time,8
  163. solve

  164. dofsel,s,,fy
  165. fcum,add,1,
  166. dofsel,all
  167. f,9,fy,-25000
  168. f,8,fy,-25000
  169. f,28,fy,-25000
  170. f,29,fy,-25000
  171. time,9
  172. solve

  173. dofsel,s,,fy
  174. fcum,add,1,
  175. dofsel,all
  176. f,9,fy,-25000
  177. f,10,fy,-25000
  178. f,30,fy,-25000
  179. f,29,fy,-25000
  180. time,10
  181. solve

  182. dofsel,s,,fy
  183. fcum,add,1,
  184. dofsel,all

  185. f,10,fy,-25000
  186. f,30,fy,-25000

  187. time,11
  188. solve

  189. !悬索桥结构的体系转换
  190. !施工完成后,梁将参与结构的受力,此时应删除由于梁的作用而加在索上的集中力,用梁本身的重量来代替,因此需要激活所有吊杆和梁单元
  191. !删除所有悬索上的集中力,包括铰支节点上的集中力
  192. nsel,s,node,,1,10,1
  193. nsel,a,node,,22,30,1    !有问题,计算不收敛,可能需要重启动
  194. fdele,all,fy

  195. esel,s,live
  196. esel,invert
  197. ealive,all
  198. nsel,all
  199. esel,all
  200. time,12
  201. solve
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发表于 2011-3-15 17:02 | 显示全部楼层
有没有桁架式起重机的资料啊?模型及建模过程
 楼主| 发表于 2011-3-15 17:29 | 显示全部楼层
发表于 2011-4-10 21:56 | 显示全部楼层
这个东西很需要,下载下来了。准备好好研究下。悬索斜拉都有非线性问题,看看这个能不能研究下。
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