带脱空缺陷SRCFT短柱的轴压性能分析

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中图分类号：TU398.9文献标识码：A

Analysis of Axial Compression Performance of SRCFT Short Columns with Void Defects

ZHAN Jiedong，LI Chengwu*，TENG Zhenchao，LIANG Chenguang，CHEN Zhongwei （School of Civil Engineering，Northeast Petroleum University，Daqing，Heilongjiang l63318，China）

Abstract：In order to explore the axial compression performance and failure mode of steel reinforced concrete filled steel tubular（SRCFT） short columns with initial concrete imperfection，a finite element model of SRCFT short columns with initial concrete imperfection under axial compression is established， the parameters of SRCFT short columns with diffrent gap radio，steel tube strength，steel tube thickness，concrete strength，steel strength and steel type are analyzed，and the axial compression performance and failure mode of SRCFT short columns with initial concrete imperfection are discussed. The results show that the SRCFT short columns with initial concrete imperfection increase with the increase of steel tube strength，steel tube thickness，concrete strength，steel strength and steel type.The specimens with annular debonding defects exhibited ultimate bearing capacity reductions from 19.11% to （204 20.91% when the debonding rate increased from 1.1% to 3.3% ，while those with spherical cap debonding defects showed capacity decreases from 8.74% to 15.77% corresponding to debonding rates progressing from 2. 2% to 6.6%. That is，with the increase of the gap ratio，the ultimate bearing capacity of the specimen decreases and the axial compression performance is weakened. It can provide a theoretical basis for the study of SRCFT short columns with initial concrete imperfection.

Key words： initial concrete imperfection；cross profile steel；concrete filled steel tubular short column；axial compression performance；finite element analysis

钢-混组合结构由于具有较好的承载力、延性和抗震性能，在交通和土木工程领域被广泛应用，常见于高层建筑和桥梁等[]。（剩余9285字）