摘要
为适应建筑多功能、大跨度、重荷载、高抗震的发展要求,框架梁端部负弯矩纵筋配筋率通常较高,节点区钢筋过于密集,混凝土施工质量不易保证,对结构综合性能有不利影响。先对梁端负弯矩纵筋部分设置于梁侧楼板内(简称APNRFS)的布筋方式进行阐述,然后基于试验结果分析探讨了该配筋方式对结构性能带来的变化及相关构造问题。研究表明:梁端采用APNRFS布筋方式一般不会降低框架梁的承载力;梁端的弯曲变形能力和结构抗震性能有一定提高;移至板内的梁负筋布置宽度宜小于有效翼缘宽度范围;移至板内的梁端负筋宜同时兼作楼板负筋;横向分布筋参与受力,设计中应适当增配。
In order to meet the development requirements of multi-function,large-span,heavy load and high seismic resistance in buildings,the negative rebars ratio at the end of the frame beam is usually high,rebars in joint are too dense,thus the quality of concrete construction is difficult to ensure,which has adverse effects on the comprehensive performance of the structure.The concept arranging partial negative rebars of frame beam ends into side floor slab(APNRFS)was expounded first.Then,based on the experiment results,the changes in structural performance and related structural issues caused by this reinforcement method were analyzed and discussed.The analysis results show that using APNRFS reinforcement at the beam end generally does not reduce the bearing capacity of the frame beam,the bending deformation capacity of the beam end and the seismic performance of the structure have been improved to a certain extent.The arrangement width of the negative rebars of the beam moved into the slab should be less than the effective flange width range.The negative rebars at the end of the beam that has been moved into the slab should also serve as the negative rebars of the floor slab.The transverse distributed rebars participates in the stress,and should be appropriately added in the design.
作者
郑宏宇
黄林普
柯晓军
许成浩
范博文
ZHENG Hongyu;HUANG Linpu;KE Xiaojun;XU Chenghao;FAN Bowen(Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China)
出处
《建筑结构》
北大核心
2024年第6期74-77,31,共5页
Building Structure
基金
国家自然科学基金项目(51668007)
广西自然科学基金项目(2018GXNSFAA050007)。
关键词
钢筋混凝土
框架梁
负弯矩纵筋
楼板
钢筋布置
剪力滞
reinforced concrete
frame beam
negative rebar
floor slab
rebars arrangement
shear lag
