基于不同结构形式的钢箱梁锚固区力学行为研究  

Mechanical behavior analysis on different structural forms of steel box girder anchorage zone

作　　者：党栋[1] 贺拴海[1] 高小妮[2] 

机构地区：[1]长安大学公路学院,陕西西安710064 [2]交通运输部公路科学研究院,北京100088

出　　处：《西安建筑科技大学学报（自然科学版）》2012年第6期818-823,共6页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家交通运输部西部交通建设项目(2011318812970);中央高校基本科研业务费专项资金项目(CHD2011ZY003)

摘　　要：为提高索梁锚固区数值分析的准确性,根据陕西汉中某斜拉自锚式悬索组合体系桥吊杆锚固区的结构特点,对两种锚固构造和不同锚固区节段长度,建立了8个单元模型.对不同模型中的应力、变形和结构整体屈曲特性进行对比分析.分析结果表明:采用相同锚固结构形式时,不同锚固区节段长度对锚固区应力分布情况影响较大;随着节段长度的增加,锚固区整体变位的变化趋于稳定;节段长度的选取对锚固区结构屈曲特性影响明显.无论采用哪种锚固构造设置,当锚固区节段长度选取远离锚固区2倍梁高时,能较准确反应结构的受力情况.所得结论可供锚固区数值模拟及模型试验节段选取时参考.According to the deficiency of numerical simulation analysis on segment selection in exiting suspender anchorage zone and the characteristic of suspender anchorage zone structure in exiting cable-stayed and self-anchored suspension combination bridge,8 shell element models analysis of two anchorage zone structures about four diffident anchor segment length were established.Stress distribution,displacement and buckling behavior of anchorage zone on the 8 models were brought into comparison,which showed that,when the same anchorage structure form is adopted,the influences of anchor segment length on the stress distribution of anchorage zone are large;the variation of overall deflection in the anchorage zone tends to be stable with the segment length increase.The segment length section have significant effect on buckling behavior of anchor structure.No matter what kind of anchor construction set,the selection length of anchor segment is at least 2 times the height of girder away from anchorage zone in order to response mechanical characteristics of anchor structure.The results can be used as a reference for numerical simulation and model tests of anchor structure.

关 键 词：桥梁工程 锚固区 非线性 应力分布 稳定性分析 

分 类 号：U448[建筑科学—桥梁与隧道工程]