型钢混凝土柱基于受剪行为解耦的承载力计算方法研究  

Decomposition of the Shear Strength of Steel Reinforced Concrete Columns

作　　者：薛亦聪 尚崇新 杨勇 于云龙 卢黎红 XUE Yicong;SHANG Chongrin;YANG Yong;YU Yunlong;LU Lihong(Key Laboratory for Structural Engineering and Earthquake Resistance,Xi'an University of Architecture and Technology,Xi'an 710055,China;Key Laboratory of Concrete and Pre-stressed Concrete Structures of Ministry of Education,Southeast University,Nanjing 210096,China;Beijing Senleiyuan Planning&Architecture Design Co.,Ltd.,Beijing 100089,China)

机构地区：[1]西安建筑科技大学结构工程与抗震教育部重点实验室,西安710055 [2]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210096 [3]北京森磊源建筑规划设计有限公司,北京100089

出　　处：《建筑钢结构进展》2023年第7期75-84,共10页Progress in Steel Building Structures

基　　金：东南大学混凝土及预应力混凝土结构教育部重点实验室开放课题(CPCSME2020-07)。

摘　　要：在各国现行规范中,强度叠加法广泛应用于型钢混凝土柱的受剪承载力计算,即型钢混凝土柱的受剪承载力单纯等同于型钢腹板受剪承载力与钢筋混凝土部分受剪承载力之和,不考虑二者间的相互作用。但因型钢与钢筋混凝土部分材料属性与截面面积差异巨大,导致两部分的受剪承载力无法同时达到峰值,致使传统强度叠合法偏于不安全。为解决上述问题,在传统桁架-拱模型和现行规范计算方法中引入了变形协调条件,以此确定了型钢与钢筋混凝土部分在受剪全过程中的承载力分配准则,并基于41个型钢混凝土柱的试验结果验证了所提方法的有效性。计算结果表明,提出的计算模型可准确预测型钢混凝土柱的受剪承载力。此外,在不考虑分项系数与强度折减系数的前提下,我国规范JGJ 138-2016、澳大利亚/新西兰规范AS/NZS2327:2017均过度低估了型钢混凝土柱的受剪承载力,而美国规范ANSI/AISC 360-16、欧洲规范BS EN1994-1-1:2004、我国规范YB 9082-2006均高估了部分试件的受剪承载力,且部分承载力高估程度超40%。In current design standards,the strength superposition method is basically used for steel reinforced concrete(SRC)columns,indicating that the shear strength of SRC columns can be the summation of the shear strengths of steel web and reinforced concrete(RC)without considering the interaction between these two parts.However,the differences in material properties and sectional dimensions of section steel and RC cause that the shear strengths of these two parts cannot reach their peak value simultaneously,which may lead to unsafe strength predictions.This paper introduces the deformation compatibility into the traditional truss-arch model and code-based calculation methods to address the problem above,so as to determine the shear strength distribution criterion of the section steel and RC part in the whole process of shearing.Then,a database containing 41 test results of shear-critical SRC columns is used to verify the proposed deformation compatibility.The results indicate that the compatible truss-arch model proposed in this paper can obtain accurate shear strength predictions.Meanwhile,without partial factors and strength reduction factors,the Chinese code JGJ 138—2016 and the Australia/New Zealand code AS/NZS 2327:2017 excessively underestimate the shear strengths of the specimens in the database.The American code ANSI/AISC 360-16,the European code BS EN 1994-1-1:2004,and the Chinese code YB 90822006 all overestimate the shear strength of some specimens,in which the calculated strengths can reach 40% more than the test results.

关 键 词：型钢混凝土柱 受剪承载力 变形协调 桁架-拱模型 设计规范 

分 类 号：TU398.9[建筑科学—结构工程]