蝶形拱桥的索力非线性及影响因素分析  

Analysis on Nonlinearity and Its Influencing Factors of Cable Forces of Butterfly-shaped Bridges

作　　者：霍学晋[1] 高玉峰[2] 阳洋[1,3] 

机构地区：[1]清华大学土木工程安全与耐久教育部重点实验室,北京100084 [2]西南交通大学土木工程学院,四川成都610031 [3]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045

出　　处：《四川大学学报（工程科学版）》2013年第2期47-55,共9页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(51138007);国家科技支撑计划资助项目(2011BAJ09B02)

摘　　要：蝶形拱桥由于造型独特使得其非线性受力行为较之普通拱桥更加难以掌握,传统的未充分考虑非线性影响的设计方法已不再适用。在自编程序的基础上,全面分析了蝶形拱桥的索力非线性及影响因素。结果表明:均布荷载作用下,主吊索力的非线性系数与索力值成反比;3种索中主吊索的垂度对索力的影响最大;对于主吊索力,拱肋单元的梁柱效应在全部梁柱效应中的比例并不大;密索布置时,不考虑索的垂度效应得到的斜拉索力偏于不安全;偏载荷载越靠近索面,索力受非线性因素的影响越小;主吊索采用斜索形式后,使得自身的非线性效应降低,而斜拉索和副吊索的非线性效应增大。Due to the unique modeling of butterfly-shaped arch bridge,the nonlinear mechanical behavior is difficult to master compared with ordinary arch bridges,and the traditional design method which is not fully considered in nonlinear influence is not applicable.On the basis of self-compiled program,the nonlinear property and its influencing factors were comprehensively analyzed according to butterfly-shaped arch bridge.The results showed that the nonlinear coefficients of main cable forces are inversely proportional to the values of cable force under uniform load.The main cable sag has most influence on nonlinear cable forces.The beam-column effect of arch-rib elements accounts for small percentage in total effect for the main cable forces.When the dense cable system is adopted,the stay cable forces are not reliable if the cable sag is not considered.The nonlinear factors have less influence on cable forces when the eccentric load is close to cable plane.When the main cables are tilted,the own nonlinear effect is decreased,however,the nonlinear effect of stay cables and subsidiary cables is increased.

关 键 词：桥梁工程 几何非线性 增量迭代法 蝶形拱桥 索的垂度 

分 类 号：U448.225[建筑科学—桥梁与隧道工程]