混凝土板柱节点弯曲裂缝截面冲切承载力验算方法研究  

Checking Method Study of Punching Shear Capacity on the Flexural Crack Section in Concrete Slab-Column Joints

作　　者：潘立[1] 

机构地区：[1]中国建筑科学研究院建筑结构研究所,北京

出　　处：《土木工程》2020年第6期587-593,共7页Hans Journal of Civil Engineering

摘　　要：混凝土板柱结构中,板柱相连截面同时作用较大弯矩和冲切剪力,为主要设计控制部位。《混凝土结构设计规范》(GB 50010-2010)中板的冲切承载力验算方法,未考虑弯曲裂缝减小验算截面的不利影响,可能导致验算结果偏于不安全。结合混凝土板柱结构中节点弯剪破坏工程实例,基于GB 50010-2010规范相应公式,提出了混凝土板柱节点开裂截面冲切承载力验算方法,通过算例说明了相应验算过程且与规范验算结果进行了比较,并配合技术分析给出了相关设计建议,由此初步探索了如何避免裂损促使板柱节点发生脆性冲切破坏,结果可作为规范方法的补充供结构设计参考。In concrete slab-column structures, sections of slab connected with column are always acted with larger moment and punching shear simultaneously, where are main control positions in the structure design. According to Code for design of concrete structures (GB 50010-2010) which does not relate to adverse effect of the checking section reduced by bending crack, joint checking results for punching shear capacity may lead to unsafe design. Combined with the actual destroy example owning to damage of slab-column joints forced by moment &punching shear, and based on GB 50010-2010 code, the modified checking method for punching shear capacity of concrete slab- column joints is proposed, that includes the bending crack influence on checking sections. Then by means of checking examples, the calculation process is explained on comparison between the code method and the modified method, later relative design suggestions are offered with shown technical analysis, which can be taken as useful references for structure design in order to avoid brittle punching failure on cracked joints in concrete slab-column structures.

关 键 词：混凝土板柱结构 板柱节点 冲切承载力 弯曲裂缝 开裂截面受压区高度 弯剪脆性破坏 

分 类 号：TU7[建筑科学—建筑技术科学]