横梁刚度对分离式双箱梁拱组合宽桥受力性能的影响  

Research on Effect of the Rigidity of Transverse Beams on the Behavior of Separated Two-box Combined Wide Bridge with Continuous Beam and Arch

作　　者：黄卿维[1] 陈昀明[1] 孙旗堂[1] 陈宝春[1] 

机构地区：[1]福州大学土木工程学院,福建福州350108

出　　处：《南昌大学学报（工科版）》2011年第4期360-364,共5页Journal of Nanchang University(Engineering & Technology)

基　　金：科技部国际科技合作计划资助项目(2009DFA72220)

摘　　要：以带横梁的分离式双箱主梁的某大桥为背景工程,利用大型通用软件ANSYS建立全桥的实体有限元模型。通过比较,实桥静载试验结果与有限元值吻合良好,验证了该有限元模型的正确性,并通过该有限元模型改变横梁厚度的方式,分析了横梁刚度对这种组合宽桥拱肋、主梁与横梁受力性能的影响。结果表明:随着横梁厚度的增加,拱肋的挠度与内力有小幅增加,而主梁与横梁的横桥向应力可有效地减小;但其厚度增大到一定程度后,对横桥向应力减小作用会减弱;背景工程的横梁设置合理可行。As the background project of a two-box PC combined wide bridge with continuous beam and arch, the finite element model for this bridge based on commercial finite element program ANSYS was established. The simulation results were in good agreement with the result of the finite element model and test data, which verified the correctness of the finite element model. Through changing the thickness of transverse beam in the finite element model, effect of the rigidity of transverse beam on the behavior of this composite structure was analyzed. The results of the analysis showed that with the increasing of the thickness of transverse beam, the deflection and internal force of arch rib raised within a narrow range,and transverse stress of main girder and transverse beam decreased effec- tively. When the thickness of transverse beam increased to some degree, the advantageous impact on transverse stress weakened. The setting of transverse beam of the research bridge was reasonable and feasible.

关 键 词：宽桥 分离式双箱主梁 横梁刚度 空间受力 有限元 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]