预应力腹板开洞组合梁非线性有限元分析  

Nonlinear finite element analysis of prestressed composite beam with web opening

作　　者：王鹏 周东华[2] 王永慧[3] 杨坤华[1] 

机构地区：[1]昆明理工大学城市学院,昆明650093 [2]昆明理工大学建筑工程学院,昆明650093 [3]昆明理工大学成人教育学院,昆明650093

出　　处：《建筑结构》2018年第2期72-78,共7页Building Structure

基　　金：国家自然科学基金资助项目(51308269,51668027,51468026,51268022)

摘　　要：为研究预应力腹板开洞组合梁在静载作用下的受力性能,以通用有限元程序ANSYS为平台,提出了用于模拟预应力腹板开洞组合梁非线性全过程受力行为的精细有限元模型,并对预应力腹板开洞组合梁的承载力影响参数（预应力筋布置形式、预应力筋初始张拉力、混凝土板配筋率、栓钉布置）进行了分析。研究结果表明：施加预应力能明显提高腹板开洞组合梁的刚度和承载力,而且扩大了组合梁的弹性承载力;增加混凝土板的配筋率能有效提高组合梁的变形能力并减少混凝土板的裂缝;增加栓钉的数量能减小组合梁的界面滑移,并能提高预应力腹板开洞组合梁的刚度和承载力。In order to investigate the mechanical behaviors of prestressed composite beams with web opening under static load,an elaborate finite element model was proposed for simulating the nonlinear behavior of prestressed composite beams with web opening using the finite element program ANSYS,and its influential parameters（ e. g. layout of the tendons,initial tensioning force of prestressing tendons,reinforcement ratio of concrete slab and the number of headed studs） were analyzed. The calculation results show that the stiffness and ultimate bearing capacity are obviously improved by prestressing techniques applied to composite beams with web opening,and its elastic bearing capacity will be increased.The deformability can be effectively enhanced and the cracking of the concrete will be decreased by increasing the reinforcement ratio of concrete slab. The interface slip decreases,the stiffness and bearing capacity increases of the beams with the increase of the number of headed studs.

关 键 词：预应力 组合梁 腹板开洞 承载力 有限元分析 

分 类 号：TU398.9[建筑科学—结构工程]