竖向荷载下现浇楼盖中的梁支座截面有效翼缘宽度  

THE EFFECTIVE FLANGE WIDTH OF BEAM SUPPORT SECTIONS IN CAST-IN-SITU FLOORS UNDER VERTICAL LOADS

作　　者：蒋利学[1,2] 郑乔文[1] 

机构地区：[1]上海市建筑科学研究院,上海200032 [2]上海市工程结构新技术重点实验室,上海200032

出　　处：《工业建筑》2009年第S1期175-180,共6页Industrial Construction

基　　金：国家科技支撑计划项目(2006BAJ03A10);建设部研究开发项目(2007-K3-16)

摘　　要：为了考虑梁板协同工作对梁受力性能影响,可将现浇楼盖中的梁按T形截面进行计算分析,其首要问题是梁截面有效翼缘宽度的取值。对带现浇楼板的连续梁在竖向荷载作用下的受力性能进行非线性有限元分析,并在用试验验证计算结果可靠性的基础上,分析了板厚、梁高、梁宽、梁跨、板宽、约束条件、荷载形式、纵向裂缝等因素对梁中支座截面有效翼缘宽度的影响。分析结果表明,上述因素对梁支座截面有效翼缘宽度均有一定影响,其中以梁高、梁跨和梁宽的影响较明显。最后,对现浇钢筋混凝土弱节点框架提出了竖向荷载作用下梁中支座截面有效翼缘宽度的建议公式。In order to consider the effects of the interaction between beams and slabs on the structural behavior of beams,the beams in cast-in-situ floors may be analyzed as T-shaped sections,and the first problem is to decide the effective flange width of beam sections.A nonlinear finite element analysis was carried out for the structural behavior of continuous beams with cast-in-situ slabs under vertical loads,and the effects of factors such as slab thickness,beam height,beam width,beam span,slab width,constraint conditions,load type,longitudinal cracks etc.on the effective flange width of middle support sections was analyzed after the calculation reality was verified by the test results.The analysis results show that all of the above factors have influences on the effective flange width of beam support sections,and the beam height,beam span and beam width affect the effective flange width more evidently than the others.At last,the calculating formula of the effective flange width of middle support beam sections under vertical loads is proposed for cast-in-situ reinforced concrete frames with weak beam-column connections.

关 键 词：竖向荷载 现浇楼盖 有效翼缘宽度 非线性有限元分析 梁板协同工作 

分 类 号：TU375[建筑科学—结构工程]