腹板开洞钢-混凝土组合梁非线性有限元分析  

Nonlinear FEM Analysis on Steel-Concrete Composite Beam with Web Opening

作　　者：王鹏[1] 周东华[1] 王永慧[1] 陈旭[1] 李龙起[1] 

机构地区：[1]昆明理工大学建筑工程学院,云南昆明650093

出　　处：《沈阳建筑大学学报（自然科学版）》2011年第5期809-817,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(50778086);教育部博士点基金项目(20095314110008);云南省自然科学基金项目(2006E0024M)

摘　　要：目的研究腹板开洞组合梁在静载作用下的受力性能,找出影响腹板开洞组合梁受力性能的主要因素.方法采用有限元软件ANSYS对9根腹板开洞组合梁和1根对比组合梁试件进行了非线性模拟计算.试件均为完全剪力连接,主要变化参数为混凝土翼板的板厚、配筋率与洞口尺寸.结果计算显示腹板开洞显著地降低了组合梁的承载力和刚度,洞口上方混凝土翼板承担了截面总剪力的77.46%,而钢梁仅承担了截面总剪力的22.54%.结论增加混凝土翼板厚度能有效地提高开洞组合梁承载力,增加混凝土翼板的配筋率能有效地提高组合梁的变形能力.随着洞口宽度的增大洞口上方的界面滑移急剧增大;随着洞口高度的增大,钢梁承担的剪力在截面总剪力中所占比例相对减小,而混凝土翼板承担的剪力所占比例相对增大,混凝土翼板对腹板开洞组合梁的竖向抗剪承载力有较大的贡献.The paper aims to investigate the mechanical behavior of composite beams with the web opening under the static load. Nine composite beams with the web opening and one contrasting composite beam were analyzed by using the finite element program ANSYS. Specimens were all full-interraction, and the major pa- rameters included the thickness, reinforcement ratio of concrete slab and hole＇s size. The calculation results show that the bearing capacity and stiffness of the composite beams were decreased notably by the web o- pening. Concrete slab above the hole is beared 77.46% of the cross-sectional total shear force, while that of steel beam is no more than 22. 54%. The ultimate load carrying capacity and deformability of composite beams with the web opening can be effectively enhanced by increasing the thickness and reinforcement ratio of concrete slabs. The interface slip increases rapidly with the increase of the hole＇s width. As the hole＇s height increases, the shear force proportion which occupied by the steel beam decreases relatively and that of the concrete slab increases relatively in the cross-sectional total shear, which provides a significant contribu- tion to the shear bearing capacity.

关 键 词：组合梁 腹板开洞 有限元分析 界面滑移 抗剪承载力 

分 类 号：TU398.9[建筑科学—结构工程]