某大跨度现浇楼盖结构中框架边梁裂缝原因分析  

Cause analysis of cracks of frame edge beams in a longspan cast-in-place floor structure

作　　者：张国强[1] 黎杰 张洪霞 栾学立 苏哲 ZHANG Guoqiang;LI Jie;ZHANG Hongxia;LUAN Xueli;SU Zhe(Engineering Research Institute of Appraisal and Strengthening of Shandong Jianzhu University Co.,Ltd.,Jinan 250013,China;School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China;Jinan Urban and Rural Construction Development Service Center,Jinan 250102,China)

机构地区：[1]山东建筑大学工程鉴定加固研究院有限公司,山东济南250013 [2]山东建筑大学土木工程学院,山东济南250101 [3]济南市城乡建设发展服务中心,山东济南250102

出　　处：《四川建筑科学研究》2024年第2期63-68,共6页Sichuan Building Science

摘　　要：通过对某大跨度现浇楼盖结构中框架边梁破坏现象的观察和计算结果的分析,得出以下结论:框架边梁与楼盖次梁整体现浇时,端部存在嵌固约束作用,特别是支承多根大跨度次梁的框架边梁始终处于弯剪扭复合受力状态。框架边梁两端1/3跨度内协调扭转嵌固约束作用显著,应高度重视,不可折减或忽略,设计时应考虑抗扭作用;框架边梁中部约1/3跨度内次梁的嵌固约束作用不显著,可不计边梁的约束影响,边梁的最大扭矩变化较小,中部约1/3跨度内次梁可按照两端简支梁设计。Based on the observation and calculation of the failure phenomenon of the edge beams in a large-span cast-in-place floor structure,the following conclusions are drawn.The end of the edge beams of the frame and the secondary beams of the floor are embedded and restrained when the whole cast in place,especially the edge beams of the frame supporting multiple large-span secondary beams are always in the state of bending,shear and torsion.The restraint effect of coordinated torsional embedment in the 1/3 span of the frame edge beam is significant,which should be paid great attention to and should not be reduced or ignored,and the anti-torsional effect should be considered in design.The binding effect of the secondary beam in the middle 1/3 span of the frame edge beam is not significant,which can be disregarded,and the maximum torque of the edge beam changes little,and the secondary beam in the middle 1/3 span can be designed according to the simple supported beam at both ends.

关 键 词：大跨度次梁 协调扭矩 扭转刚度 框架边梁 

分 类 号：TU375[建筑科学—结构工程]