钢筋混凝土板柱节点冲切破坏模型及承载力分析  

Punching failure models and bearing capacity analysis of reinforced concrete slab-column connections

作　　者：王朋[1,2,3] 于彬 史庆轩 张鹏[2] WANG Peng;YU Bin;SHI Qingxuan;ZHANG Peng(State Key Laboratory of Green Building in Western China,Xi′an Univ.of Arch.&Tech.,Xi′an 710055,China;School of Civil Engineering,Xi′an Univ.of Arch.&Tech.,Xi′an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education,Xi′an Univ.of Arch.&Arch.,Xi′an 710055,China)

机构地区：[1]西安建筑科技大学西部绿色建筑国家重点实验室,陕西西安710055 [2]西安建筑科技大学土木工程学院,陕西西安710055 [3]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055

出　　处：《西安建筑科技大学学报（自然科学版）》2020年第6期852-859,共8页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51878540,51608434);国家重点研发计划基金资助项目(2017YFC0703406)。

摘　　要：板柱结构是建筑结构中常用的结构形式之一,它具有结构体系简单、传力途径明确等一系列优点,但根据工程应用发现板柱结构的节点处容易发生脆性特性显著的冲切破坏.近百年来,国内外学者对板柱节点冲切破坏机理进行了大量研究,以期发现其破坏机理和破坏准则,目前学者们提出了多个冲切破坏模型.本文选取了较具有代表性的七种冲切破坏模型,对比分析各模型的传力机制及破坏准则;同时,筛选国内外已完成的202个钢筋混凝土板柱节点冲切破坏试验数据,采用前述七种冲切破坏模型承载力公式计算冲切承载力,并对计算结果进行统计分析.结果表明:目前现有的破坏模型对板柱节点的冲切破坏机理和破坏准则并未形成统一认识,各模型冲切承载力计算公式所采用的影响因素以及影响因素在计算中的贡献程度有较大差异.计算结果还表明冲切承载力与(f′c)1/3、ρ1/2有较好的吻合关系,而我国规范中计算公式并未考虑纵向钢筋配筋率的影响,混凝土强度的贡献也不同,这一发现可为进一步完善规范做出参考.The slab-column structure is one of the commonly used structural styles in the construction structure,which has a series of advantages such as simple structure system,simple and clear transmission way,etc.However,according to the engineering application,it is found that the connections of slab-column structure are prone to punching failure.In the past 100 years,scholars all over the world have been studying the punching failure mechanism of slab-column connections in order to find out its failure mechanism and failure criterion.At present,scholars have proposed several failure models.In this paper,seven typical punching failure models are selected to compare and analyze the force transfer mechanism and failure criteria of each model.At the same time,the test data of punching failure of 202 reinforced concrete slab-column connections were screened,the punching shear capacity was calculated by using the aforementioned seven punching failure model formulas,and the calculated results were statistically analyzed.The results show that the existing failure models have not formed a unified understanding of the failure mechanism and failure criteria of the slab-column connections,and the influencing factors used in the calculation formula of the punching shear capacity of each model and the contribution degree of the influencing factors in the calculation are quite different.The results also showed that the punching shear capacity was in good agreement with(f′c)1/3 andρ1/2.However,The calculation formula does not take into account the influence of longitudinal reinforcement ratio and the contribution of concrete strength is different in Chinese codes.This finding may be a reference for further improvement of the codes.

关 键 词：钢筋混凝土 板柱节点 破坏模型 冲切承载力 

分 类 号：TU398+.1[建筑科学—结构工程]