摘要
为了解设置内衬混凝土波形钢腹板组合梁桥的剪切性能、轴向性能、弯曲性能和稳定性能及内衬混凝土参数对其力学性能的影响,以某三跨波形钢腹板组合连续箱梁桥为背景,采用ANSYS软件建立空间有限元模型,分析设置内衬混凝土后波形钢腹板组合梁桥的结构挠度、轴向应力、剪切应力、弯曲性能和稳定性,研究内衬混凝土的长度、厚度变化对结构稳定性、轴向性能及弯曲性能的影响,并给出内衬混凝土的合理长度与厚度建议。结果表明:内衬混凝土能显著降低支点区域波形钢腹板的剪应力和预应力施加效率,提高结构稳定性能;混凝土桥面板压应力随着内衬混凝土长度和厚度的增加而减小;实桥设计时,建议内衬混凝土长度不小于中支点梁高,厚度最大不小于0.07倍中支点梁高,最小满足混凝土浇筑及构造要求。
To understand the shear, axial, flexural and stability behavior of the composite girder bridge with corrugated steel webs encased with the concrete and the effects of the parame-ters of the encased concrete on the mechanical behavior of the bridge, a three-span continuous com-posite box girder bridge with corrugated steel webs was cited as an example and the software AN- SYS was used to establish the spatial finite element models for the bridge. The structural deflec-tion, axial stress, shear stress, flexural behavior and stability of the bridge after the webs were encased with the concrete were analyzed, the effects of the length and thickness changes of the en-cased concrete on the structural stability, axial behavior and flexural behavior were studied and the proposals for the reasonable length and thickness were made. The results indicate that the encased concrete can significantly reduce the shear stresses and the prestressing efficiency of the corrugated steel webs in the support areas and enhance the structural stability. The compressive stresses of the concrete deck slabs decrease with the increase of the length and thickness of the encased con-crete. In the design of the actual bridge, it is proposed that the length of the encased concrete should not be less than the height of the girder at the intermediate support. The maximum thick-ness should not be less than 0. 07 times of the height of the girder at the support while the mini-mum thickness should satisfy the requirement for the concrete casting and the construction.
出处
《桥梁建设》
EI
CSCD
北大核心
2017年第4期54-59,共6页
Bridge Construction
基金
国家自然科学基金项目(51308070
51408070)
国家重点基础研究发展计划("973"计划)项目(2015CB057702)~~
关键词
组合梁桥
波形钢腹板
内衬混凝土
有限元法
挠度
应力
弯曲性能
稳定性
composite girder bridge
corrugated steel web
encased concrete
finite element method
deflection
stress
flexural behavior
stability
