源于纵筋面混凝土劈裂的无腹筋板冲切模型

任达; 刘坚; 焦楚杰

doi:10.11835/j.issn.1674-4764.2011.02.006

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源于纵筋面混凝土劈裂的无腹筋板冲切模型

更新时间：2023-11-28

- 源于纵筋面混凝土劈裂的无腹筋板冲切模型
- Modeling of Punching Failure Initiated by Concrete Splitting at Longitudinal Bar Level for Slabs without shear reinforcement
- 土木与环境工程学报（中英文） 2011年33卷第2期页码：24-27
- 作者机构：
  
  1. 广州大学土木工程学院,广州,510006
  2. 中南大学,土木建筑学院,长沙,410075
- 作者简介：
- 基金信息：
  
  国家自然科学基金项目(50708022);建设部科研开发项目(10K327 10K418);广州市属高校“羊城学者”科研项目(10A043G)
- DOI：10.11835/j.issn.1674-4764.2011.02.006
  中图分类号：
- 纸质出版：2011
- 稿件说明：
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任达, 刘坚, 焦楚杰. 源于纵筋面混凝土劈裂的无腹筋板冲切模型[J]. 土木与环境工程学报（中英文）, 2011,33(2):24-27.

REN Da, LIU Jian, JIAO Chu Jie. Modeling of Punching Failure Initiated by Concrete Splitting at Longitudinal Bar Level for Slabs without shear reinforcement[J]. Journal of Civil and Environmental Engineering, 2011, 33(2): 24-27.
任达, 刘坚, 焦楚杰. 源于纵筋面混凝土劈裂的无腹筋板冲切模型[J]. 土木与环境工程学报（中英文）, 2011,33(2):24-27. DOI： 10.11835/j.issn.1674-4764.2011.02.006.

REN Da, LIU Jian, JIAO Chu Jie. Modeling of Punching Failure Initiated by Concrete Splitting at Longitudinal Bar Level for Slabs without shear reinforcement[J]. Journal of Civil and Environmental Engineering, 2011, 33(2): 24-27. DOI： 10.11835/j.issn.1674-4764.2011.02.006.

摘要

以工程中常见的配筋率较大（＞085）、厚度较小（≤120 mm）的板为对象

通过对冲切破坏特征的观察分析

假定沿纵向钢筋平面

混凝土劈裂所致的纵筋销栓失效为连锁破坏源

建立了新的错动冲切模型并推导了上限解.研究发现

与按搜集到的构件样本总体分析结果相比（均值为1072

变异系数为0250）

符合上述特征的试件组

其冲切承载力理论计算值和试验观测值之比的均值变化不大（为1017）

而变异系数有显著降低（为0184）

说明所作假定及所建模型用于描述该类板的受力行为是合适的.

Abstract

A new punching failure model has been developed for thinner slabs (≤120 mm thick) yet with a larger reinforcement ratio (＞085). On the assumption that the trigger of ultimate failure is the loss of dowel action caused by concrete splitting along the horizontal surface at longitudinal bar level

an equilibrium equation was established and an upperbound solution was obtained. The computation of punching shear capacity shows that for a total of 194 specimens collected

the mean and the coefficient of variation are 1072 and 0.250 respectively. As for the 116 members (out of all 194 ones) with the above character

it is found that there is little change of the mean (equal to 1017) yet an apparent decrease in the coefficient of variation (equal to 0184)

which justifies the proposed hypothesis and refined mode in estimating punching resistance of such members.

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