筑路机械与施工机械化
2017年
文章编号：1000-033X(2017)09-006+-06
第34卷
有限元法在连续梁落架方案可行性模拟中的应用
尹忠文，杨
6军2
（1.云南云岭高速公路工程咨询有限公司.云南昆明
650000
2.江苏东交工程检测股份有限公司，江苏南京210000）
摘要：以某铁路客运专线上的一联预应力混凝土连续梁桥为对象.采用有限元分析软件MIDAS/ Civil建立连续梁桥模型，通过改变边界条件的方法来模拟各种工况，得出不同工况下梁体的应力、变形和支座处支座反力。结果表明：土模边跨横向的不均匀落架会造成跨中区出现较大拉应力，应横向对称拆除；不移除土模时，拆除右边跨和中跨比仅拆除中跨产生的压应力要小；在拆架前对梁体进行临时堆载.降低未落架梁跨的上挑。
关键词：桥架工程；有限元法；满堂支架法；落架方案
中图分类号：U441.5
文献标志码：B
Applicationof FiniteElement Method inSimulatingFeasibility of
SupportRemovalProgram ofContinuousBeam
YIN Zhong-wen',YANG Jun
(1. Yunnan Yunling Highway Engineering Consulting Co, , I.td, . Kunming 650000. Yunnan. China: 2, Jiangsu EASTTRA.NS Engineering Inspection Co. . Ltd. . Nanjing 210000., Jiangsu. (hina)
Abstract: Taking a prestressed conerete continuous beam bridge on a passenger dedicated line as the object, the finite element analysis software MIDAS/Civil was used to establish the model of continuous beam bridge. Various working conditions were simulated by changing the boundary conditions, and the stress and deformation of the beam under different working conditions and the reaction force at the bearing were obtained. The results show that unevenly removing the support at the lateral of the earth formwork will cause a large tensile stress in the middle area, so the removal should be horizontally symmetric; when the earth formwork is not removed, the compressive stress produced by dismantling the right cross and the middle span is smaller than that by only dismantling the middle span; the upward bending of the beam can be reduced by temporarily stacking the load before removing the support.
Key words: bridge engineering; finite element method; support construction method; support removalprogram
引言 0
某桥采用满堂支架现浇法施工，由于其中有边跨下方地表高程较高，施工单位为节约成本，在地表土高程较高的边跨下不搭设支架，而采取压实土体的方式制作土模.其余两跨则在处理地基后搭设支架，然后预压，安装底模板.浇筑梁体，张拉预应力
筋，养护梁体。由于拆除土模速度较慢，与另外2个采用现浇支架的边跨无法保持拆除速度同步，可能造成连续梁受力不均。如果应力过大，远超出规范要求的合理范围，则可能造成梁体提前开裂，严重甚至会导致全桥破坏；但是如果应力和变形在合理范围之内，对结构的稳定性和安全性不会造成影响，则说明这种方案也是可行的1。
收稿日期：2017-02-06
作者简介：尹息文（1968-），男，云南至溪人，高级工程师.研究方向为公路工程设计、施工及管理。 64
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