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小跨高比钢板-混凝土组合连梁内力分布有限元分析

ISSN号：1002-848X
期刊名称：建筑结构
时间：2015.8.10
页码：56-63+86
分类：TU398[建筑科学—结构工程]
作者机构：[1]西安理工大学土木建筑工程学院,西安710048, [2]西安建筑科技大学土木工程学院,西安710055, [3]杭州市房屋安全鉴定检测中心有限公司,杭州310003
相关基金：国家自然科学基金（51178380,51478382,51108370）; 教育部长江学者和创新团队发展计划（IRT13089）
相关项目：高层建筑混合结构三向地震作用下的损伤演化和破坏机理研究

关键词：钢板-混凝土组合连梁, 小跨高比, 有限元分析, 内力分布, steel plate-reinforced composite coupling beam, small span-to-depth ratio, finite element analysis, internalforce distribution

中文摘要：

采用ABAQUS软件对小跨高比钢板-混凝土组合连梁内力分布进行了数值分析,通过改变连梁的跨高比、钢板厚度和纵筋配筋率,详细分析了不同参数对小跨高比钢板-混凝土组合连梁混凝土应力、纵筋轴向力、钢板内力分布规律的影响。结果表明,小跨高比钢板-混凝土组合连梁的钢筋混凝土部分承载机制类似于传统的钢筋混凝土连梁,并随着连梁跨高比的增大,对角压杆作用逐渐向桁架作用转化;对角压杆作用的存在将会给纵筋带来较大的轴向拉力,使得纵筋拉力向墙肢内纵筋末端累积;连梁纵筋配筋率对钢板剪力和弯矩影响很小,但钢板厚度对钢板剪力和弯矩影响较大;钢板轴力沿连梁跨度方向均受拉,拉力分布呈M形,连梁跨高比越大,钢板轴力越大,而随着纵筋配筋率的增大,钢板轴力逐渐减小;钢板受弯时截面受压区高度很小,远远小于受拉区高度,建议在受弯计算中不考虑钢板受压。

英文摘要：

The internal force distribution of steel plate-reinforced composite （SPRC） coupling beams with small span-to-depth ratio was simulated based on software ABAQUS. Furthermore, the span-to-depth ratio, plate thickness, longitudinal reinforcement ratio of coupling beams were all considered to analyze the effect on the distribution laws of concrete stress, axial force along longitudinal reinforcement and steel plate internal force of SPRC coupling beams with small span-to-depth ratio. The results show that load resisting mechanisms similar to those of conventional reinforced concrete （RC） coupling beams can be observed in the RC components of SPRC coupling beams with small span-to-depth ratio, where there is a transition from the domination of the arch action to the domination of the truss action as the span-to- depth ratio increases. The arch action could cause large axial tensions of the longitudinal reinforcement and results in accumulation of large tensile forces towards the ends of the longitudinal reinforcement in the wall piers. The longitudinal reinforcement ratio of coupling beams has little effect on the steel plate shear force and bending moment, but the steel plate thickness is the main influential factor. The steel plate along the coupling beam span bears tension force, and distribution of the tension is M-mode. The steel plate axial forces increase with the increase in span-to-depth ratio, but decrease with the increase in longitudinal reinforcement ratio of coupling beams. The height of compressive zone is far smaller than the height of tension zone when the steel plate section in bending. It is recommended that the steel plate under compression is not taken into account in the flexural calculation.

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