基于有限元法的组合梁剪切连接件的优化布置  

Optimal Arrangement of Shear Connectors for Composite Beams Based on Finite Element Method

作　　者：曾兴贵[1] 姜绍飞[1] 周东华[2] 

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]昆明理工大学建筑工程学院,云南昆明650500

出　　处：《应用基础与工程科学学报》2014年第3期512-524,共13页Journal of Basic Science and Engineering

基　　金：国家自然科学基金项目(51278127;50878057);国家"十二五"科技支撑计划(2012BAJ14B05)

摘　　要：结合有限元思路,采用直接刚度法推导考虑界面滑移的钢-混凝土组合梁的单元刚度矩阵,从而建立了一维组合梁单元模型.采用自编有限元程序计算了在简支情况下的组合梁的滑移和挠度,与解析解进行对比验证,两种方法计算所得结果分布曲线重合,同时也发现界面滑移对挠度的影响不能忽视.在此基础上,根据组合梁界面剪力流的分布情况,且在不增加剪切连接件数量情况下,本文针对全长均匀布置剪切连接的方式提出了采用分段均匀布置方式的优化布置方法,通过对梁端部分与跨中部的剪切连接件按5∶5、6∶4、7∶3、8∶2的分配比率进行分析比较,确定7∶3的分配方式是最优的,且能达到有效减小界面滑移,增大组合作用,进而减小组合梁挠度的目的.A one dimensional steel-concrete composite beam element model was established by adopting finite element method, and the element stiffness matrix was derived by using the direct stiffness method and taking into account the effect of interface slip. The interface slip and deflection of simply supported composite beams were calculated by using finite element program, and the results were compared with those of closed solutions. The comparison shows a good agreement, and at the same time it can be found that the impact of interface slip on deflection of composite beams is significant. In order to decrease interface slip effectively, an optimal arrangement method was proposed uniformly distributed shear connectors, which was stepwise uniform distribution for shear connectors without increasing the number of shear connector. After comparing the distribution ratio of shear connectors between the region near to the beam end and the region near to the mid-span, namely 5 ： 5,6 ： 4,7 ： 3, and 8 ： 2, the distribution ratio 7 ： 3 is an optimal distribution. And this distribution method can effectively decrease interface slip and deflection of composite beams and increase composite effect.

关 键 词：组合梁 单元刚度矩阵 界面滑移 剪切连接件 分段均匀布置 

分 类 号：TU398.9[建筑科学—结构工程]