大跨度预应力张弦式管道试验与有限元分析  

Experiment and FEM Analysis on Long-span Prestressed Beam String Pipes

作　　者：薛伟辰[1] 刘晟[1] 王恒栋[2] 卫丹[2] 

机构地区：[1]同济大学建筑工程系,上海200092 [2]上海市政工程设计研究总院,上海200092

出　　处：《建筑科学与工程学报》2007年第4期74-81,共8页Journal of Architecture and Civil Engineering

基　　金：混凝土及预应力混凝土结构教育部重点实验室开放基金项目(2005)

摘　　要：以一榀100 m跨度预应力张弦式管道为原型,设计了1∶15比例缩尺模型,在中国首次开展了张弦式管道在预应力张拉阶段、正常使用阶段及承载力极限阶段的受力全过程试验研究。基于ANSYS软件对试验全过程进行了非线性有限元模拟,并结合一致缺陷模态法与柱面弧长法,进行了同时考虑初始几何缺陷与几何非线性的屈曲分析。结果表明:半跨荷载对预应力张弦式管道较为不利,结构整体变形与上弦应力增长较为迅速;结构对平面外的初始几何缺陷较为敏感,半跨荷载下的屈曲临界荷载较全跨荷载作用时稍低;结构具有可靠的稳定性与较大的安全储备,极限承载力达到设计荷载的2.68倍;有限元计算值与试验结果吻合良好;该非线性有限元分析方法能较好地实现对预应力张弦式管道受力全过程的模拟。Based on a 100 m-span beam string pipe as an original type,a 1∶15 scaled model was firstly tested to investigate the full-range behaviors of this structure during the stretching phase,normal serviceability phase and ultimate load carrying phase in China.Nonlinear finite element simulation for the test of full-range was conducted by using ANSYS software.In addition,buckling analysis simultaneous considering initial geometrical imperfection and geometrical nonlinear was performed by combining uniform imperfections mode method and cylindrical arc length method.The results show that the whole structural deformations and member stresses increase relatively fast under half-span load,and the half-span load is disadvantaged for prestressed beam string pipe.The beam string pipe is sensitive to the out-plane initial geometrical imperfection;critical buckling load of the half-span is a little lower than that of full-span.This structure develops reliable stability and relatively large safety reserve with an ultimate load up to 2.68 times design load.The analytical results by using nonlinear finite element method analysis are in good agreement with the test results,which indicate that the nonlinear finite element method analysis is capable for the full-range simulation of prestressed beam string pipes.

关 键 词：大跨度预应力张弦式管道 预应力张弦梁 模型试验 非线性有限元全过程分析 屈曲分析 

分 类 号：TU393.3[建筑科学—结构工程]