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 long-span cast-in-place floor structure
张国强 1黎杰 2张洪霞 3栾学立 1苏哲1
作者信息
- 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
- 折叠
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.
Abstract
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Key words
long-span secondary beam/coordinated torque/torsional stiffness/frame edge beam引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据