钢筋混凝土板柱中节点冲切破坏面割线倾角研究

Research on secant inclination angle of punching failure surface of reinforced concrete interior slab-column connections

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摘要为考察板受拉纵筋屈服的板柱节点冲切破坏情况,提出一种新的试验方案,该方案能够在板自由端施加力偶和板周边施加竖向荷载。基于所提试验方案,完成了3个冲跨比和相对受压区高度不同的板柱节点冲切试验。结果表明:3个试件达到峰值荷载时,板受拉纵筋在柱边处均已屈服;板受拉纵筋配筋率从1.04%增加到1.25%,冲切破坏面割线倾角从46.3°降低到39.4°。基于本文和收集到的板柱节点冲切试验数据,建立考虑冲跨比、混凝土轴心抗压强度、板受拉纵筋配筋率和板有效高度影响的板柱节点冲切破坏面割线倾角计算公式。并给出考虑冲跨比、相对受压区高度和冲切破坏面割线倾角影响的板柱节点受冲切承载力计算公式。 To investigate the punching failure of slab-column connections in cases where the longitudinal tensile reinforcement of the slab yields,a novel experimental approach is proposed.This experimental setup facilitates the application of bending moments at the free end of the slab and vertical loads around the perimeter of the slab.Following this experimental design,three slab-column connection punching tests were conducted,each with varying punching span ratios and relative compression zone heights.The findings from the tests reveal that,when the specimens reached peak loads,the longitudinal tensile reinforcement in the slab had yielded near the column edge.Additionally,an increase in the ratio of longitudinal tensile reinforcement from 1.04%to 1.25%corresponded to a decrease in the secant inclination angle of the punching failure surface from 46.3°to 39.4°.Building upon the data from this study and compiled punching tests,a calculation formula was developed to determine the secant inclination angle of the punching failure surface,considering the punching span ratio,concrete compressive strength,longitudinal tensile reinforcement ratio,and slab effective depth.Furthermore,a calculation formula for the punching capacity of the slab was established,taking into consideration the punching span ratio,relative height of the compression zone,and secant inclination angle of the punching failure surface.

作者郑文忠曹棒郑博文王英 ZHENG Wenzhong;CAO Bang;ZHENG Bowen;WANG Ying(Key Lab of Structures Dynamic Behavior and Control(Harbin Institute of Technology),Ministry of Education,Harbin 150090,China;Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters(Harbin Institute of Technology),Ministry of Industry and Information Technology,Harbin 150090,China)

机构地区结构工程灾变与控制教育部重点实验室(哈尔滨工业大学) 土木工程智能防灾减灾工业和信息化部重点实验室(哈尔滨工业大学)

出处《哈尔滨工业大学学报》北大核心 2025年第5期88-99,共12页 Journal of Harbin Institute of Technology

基金国家自然科学基金(52078162)。

关键词板柱中节点冲切破坏面割线倾角冲跨比受压区高度受冲切承载力 interior slab-column connections punching failure surface secant inclination angle punching span ratio compression zone height punching capacity

分类号 TU375 [建筑科学—结构工程]

作者简介郑文忠(1965-),男,教授,博士生导师;通信作者:王英,wangying888@hit.edu.cn。