部分抗剪连接的型钢混凝土组合柱正截面承载力计算

发布时间：2018-05-11 19:43

本文选题：型钢混凝土柱 + 分散型钢混凝土柱　；参考：《建筑结构学报》2017年01期

【摘要】：在JGJ 138—2001《型钢混凝土组合结构技术规程》中,型钢混凝土柱的正截面承载力需根据平截面假定进行计算,但该规范并没有明确给出当平截面假定不满足时型钢混凝土柱的承载力计算方法。为此,提出抗剪连接系数的概念,用于描述型钢混凝土柱中型钢与混凝土之间的相对界面抗剪能力,综合平截面假定和叠加原理,得到在部分抗剪连接条件下普通型钢混凝土(SRC)柱和分散型钢混凝土(ISRC)柱的正截面承载力与抗剪连接系数之间的定量关系,进而提出SRC柱和ISRC柱的正截面承载力设计简化方法。计算结果表明:当轴压比相同时,SRC柱和ISRC柱的受弯承载力随其抗剪连接系数的增大而增大;轴压比越大,抗剪连接系数对组合柱的受弯承载力的影响越小;与SRC柱相比,抗剪连接系数对ISRC柱的受弯承载力影响更加显著。试验结果与计算结果的对比表明,采用所提出的方法可以较准确地计算ISRC柱的压弯承载力,计算结果具有一定的安全余度。
[Abstract]:In JGJ 138-2001, the normal section bearing capacity of steel reinforced concrete columns should be calculated according to the assumption of plane section. However, the method of calculating the bearing capacity of SRC columns when the assumption of plane section is not satisfied is not clearly given in the code. Therefore, the concept of shear connection coefficient is proposed, which is used to describe the relative interfacial shear resistance between steel and concrete in steel reinforced concrete columns, and to synthesize the assumption of plane section and the principle of superposition. The quantitative relationship between normal section bearing capacity and shear connection coefficient of normal SRC column and scattered SRC column under partial shear connection is obtained, and a simplified design method of normal section bearing capacity of SRC column and ISRC column is put forward. The results show that when the axial compression ratio is the same, the flexural capacity of SRC column and ISRC column increases with the increase of the shear connection coefficient, and the greater the axial compression ratio, the less the influence of the shear connection coefficient on the flexural capacity of the composite column, compared with the SRC column. The influence of shear connection coefficient on the flexural capacity of ISRC columns is more significant. The comparison between the experimental results and the calculated results shows that the proposed method can accurately calculate the compressive and bending bearing capacity of ISRC columns, and the calculated results have a certain safety margin.
【作者单位】：中国建筑科学研究院;清华大学土木工程系;
【分类号】：TU398.9

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