国内外规范关于扩展基础冲剪计算的对比分析

›› 2012, Vol. 33 ›› Issue (S1): 151-155.

国内外规范关于扩展基础冲剪计算的对比分析

李荣年，滕延京

中国建筑科学研究院地基基础研究所，北京 100013

收稿日期:2002-05-17 出版日期:2012-09-11 发布日期:2012-09-21
作者简介:李荣年，男，1972年生，博士研究生，讲师，主要从事地基基础方面的研究

Comparative analysis of methods for calculating shear strength of spread foundations according to different codes

LI Rong-nian, TENG Yan-jing

Institute of Foundation Engineering, China Academy of Building Research, Beijing 100013, China

Received:2002-05-17 Online:2012-09-11 Published:2012-09-21

摘要/Abstract

摘要： 各国规范对钢筋混凝土扩展基础的冲剪验算有不同的计算方法，对基础剪切模式的界定、计算公式等方面有较大不同，由此对计算结果也产生影响。针对中国规范GB50007[1]、美国规范ACI318[2]、欧洲规范EN1992[3]的设计要求，对影响钢筋混凝土扩展基础冲剪破坏的因素进行对比分析，并结合不同工况的4个算例对各国规范冲剪验算的基础底板厚度进行了对比。分析结果表明，各国规范在抗剪强度取值、验算条件、冲切锥体形状、底板纵筋配筋率影响、验算截面位置等方面的规定存在一定差异，反映出各国规范在基础冲剪影响因素方面存在不同考虑以及对基础冲剪破坏机理认识上的差异，这些差异使冲剪计算方法不同，也使得由此计算所得到的基础底板厚度有所不同。通过分析，建议对我国规范在基础底板冲剪验算截面的位置、纵筋配筋率，以及基底反力分布对冲剪承载力的影响等方面进行试验研究，进一步完善基础冲剪计算方法。

关键词: 冲切, 剪切, 影响因素, 抗剪强度, 基础

Abstract: There are different calculation methods for checking shearing or punching shear resistance of reinforced concrete expand foundation according to the codes of many countries, which have many differences about the demarcation of foundation shearing or punching shear model, computational formula and so on. So they also have effects on the calculation results. Aiming at the design requirements of the three codes, i. e. GB50007[1], ACI318[2], EN1992[3], the influencing factors of shear failure of reinforced concrete spread foundations are comparatively analyzed and the thickness of foundations is compared combined with four examples with different loadcases. The results show that the factors such as the shear strength values, checking conditions, the shapes of punching shear cones , the influence of ratio of longitudinal reinforcement and the position of control sections have certain differences according to three codes above; it is reflected that the three codes have different thoughts about the influencing factors of shear and the different understanding of shearing failure mechanism of foundation; also these differences make computational method of shear and the thickness of foundation plate different. Through analysis, the further research of the position of control sections, the ratio of longitudinal reinforcement of foundation mat and the effect of the distribution of contact pressure on shear bearing capacity is suggested, so as to further improve the calculating methods of punching shear.

Key words: punching shear, shear, influencing factor, shear strength, foundations

中图分类号:

TU202

李荣年，滕延京. 国内外规范关于扩展基础冲剪计算的对比分析[J]. , 2012, 33(S1): 151-155.

LI Rong-nian, TENG Yan-jing. Comparative analysis of methods for calculating shear strength of spread foundations according to different codes[J]. , 2012, 33(S1): 151-155.

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