连续斜梁桥结构特性研究  

Study of Structure Behavior of Continuous Skew Girder Bridge

作　　者：刘旭政[1] 张永健[2] 康晋[3] 

机构地区：[1]华东交通大学铁路环境振动与噪声教育部工程研究中心,江西南昌330013 [2]湖南省高速公路管理局,湖南长沙410001 [3]中铁大桥勘测设计院有限公司,湖北武汉430050

出　　处：《湘潭大学自然科学学报》2010年第1期41-44,共4页Natural Science Journal of Xiangtan University

基　　金：江西省教育厅科研项目(GJJ-09143)

摘　　要：运用梁格法分析了一公路连续斜梁桥不同的支座刚度及横梁刚度对整个斜梁桥受力的影响.发现支承刚度越小,其支承反力分布越均匀,因而在实际设计连续斜桥时宜选取较高的支座来降低支座刚度,以使各支反力趋于均匀,避免负反力的出现;而连续斜梁桥的横梁扭矩对横梁的刚度比较敏感,虽增加横梁的刚度可减小纵梁的最大弯矩,但会导致横梁的弯矩以及扭矩的增加,且扭矩增加迅速.所以,在横梁设计中需综合考虑以上各因素,选择刚度合适的横梁.A highway continuous skew girder bridge is analyzed with the beam girder method. In the anal- ysis,different bearing stiffness and different diaphragm stiffness is adopted. It can be found that the smaller the support stiffness, the more uniform the restraint forces are, thus, it is better to choose the higher bear- ing to have a lower stiffness so as to avoid the negative moment. The torsional moment of the diaphragm for the continuous skew girder bridge is related to the diaphragm stiffness. Through increasing the stiffness of the diaphragm, on one hand, the maximum moment in the longitudinal beam would be diminished, on the other hand, lead to the increase of the maximum moment and torsional moment of the diaphragm, of which the latter is more evident. As a result, in the design of the diaphragm, all the factors stated above have to be taken into the consideration to choose the proper stiffness for the diaphragm.

关 键 词：斜梁桥 支座刚度 横梁刚度 梁格法 

分 类 号：U443.32[建筑科学—桥梁与隧道工程]