摘要
针对目前索梁锚固区数值仿真分析节段长度选取的分歧,根据某在建斜拉-自锚式悬索组合体系桥吊杆锚固区的结构特点,采用2类锚固构造和4种锚固区节段长度,建立8个壳单元模型.对不同模型中的应力、变位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显著.不论采用何种锚固构造设置,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 existing suspender anchorage zone and the characteristic of suspender anchorage zone structure in existing 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 compared.The comparison shows 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 is adopted,the selection length of anchor segment is at least 2 times height of girder away from anchorage zone in order to reflect mechanical characteristics of anchor structure.The results can be used as a reference for numerical simulation and model tests of anchor structure.
出处
《郑州大学学报（工学版）》
CAS
北大核心
2012年第6期59-63,共5页
Journal of Zhengzhou University（Engineering Science）
基金
国家西部交通建设项目(2011318812970)
关键词
桥梁工程
锚固区
非线性
应力
稳定性
bridge engineering
anchorage zone
nonlinear
stress
stability
