关于拟梁法计算现浇混凝土双向板楼盖内力和挠度的讨论  

STUDY ON CROSS BEAMS METHOD FOR CALCULATING THE INTERNAL FORCE AND DEFLECTION OF CAST-IN-SITU CONCRETE OF TWO-WAY BOARD FLOOR

作　　者：胡雄伟[1] 梁兴文[1] 梁敏[1] 

机构地区：[1]西安建筑科技大学土木工程学院,西安710055

出　　处：《工业建筑》2010年第S1期270-273,共4页Industrial Construction

基　　金：混凝土结构设计规范项目

摘　　要：在计算楼盖结构内力和挠度时,可用拟梁法考虑梁板的协同工作。为了验证拟梁法的可靠性,应用SAP2000对6 m×6 m的单区格现浇混凝土双向板分别用有限元方法和拟梁法进行分析对比,拟梁数量由5根变化到10根。分析结果表明,与有限元法计算结果相比,当拟梁数量为5根时,用拟梁法计算所得的板跨中弯矩误差为7.2%,支座弯矩误差为12.48%,跨中挠度误差为4.1%;当拟梁数量为10根时,用拟梁法计算所得的板跨中弯矩误差17.56%,支座弯矩误差11.75%,跨中挠度误差为5.2%。直接用拟梁法计算混凝土双向板内力和挠度会产生较大误差,工程设计时应慎重使用。When calculating the internal force and deflection of floor structures,we can use the cross beams method can be used,which takes the floor and the beams' teamwork into account.In order to verify the reliability of the cross beams method,SAP2000 is used to analyze and compare the 6 m×6 m cast-in-situ concrete of two-way slab floor model which respectively uses the finite element method and the cross beams method.The number of virtual beams is changing from 5 to 10 in cross beams method.The results show that while the number of virtual beams is 5,the errors of mid-span bending moment,support moment and mid-span deflection are 7.2 percent,12.48percent and 4.1 percent respectively by using the cross beams method as compared with using the finite element method.While the number is 10,the errors of them are 17.56 percent,11.75 percent and 5.2 percent respectively.Thus,a big error will be produced when calculating internal force and defection of two-way slab floor by using cross beams method directly,which should be used carefully in practical design.

关 键 词：混凝土双向板楼盖 有限元法 拟梁法 内力 挠度 

分 类 号：TU375[建筑科学—结构工程]