(1 衢州学院建筑工程学院, 衢州 324000; 2 浙江大学建筑设计研究院有限公司, 杭州 310027;3 浙江大学建筑工程学院, 杭州 310027)

摘要: 为研究椭圆钢管混凝土柱的抗震性能,开展八根不同椭圆截面比的椭圆钢管混凝土柱在恒定轴压和单调及往复水平荷载下的拟静力试验. 并利用 OpenSEES 软件建立了椭圆钢管混凝土柱的纤维单元模型,分析了椭圆截面比、钢管强度、混凝土强度、试件高度(长细比)、轴压比等参数对椭圆钢管混凝土柱抗震性能的影响. 研究结果表明:椭圆钢管混凝土柱的水平荷载-位移滞回曲线较为饱满,表明其具有良好的塑性变形能力和耗能能力;纤维单元模型能较为准确地预测椭圆钢管混凝土柱的水平荷载-位移曲线;椭圆截面比、轴压比和试件高度的增加,对椭圆钢管混凝土柱的抗震性能有不利影响;钢管强度的提高会导致椭圆钢管混凝土柱的承载能力和耗能能力提高,但会导致其变形能力下降;混凝土强度的提高会导致椭圆钢管混凝土柱承载能力提高,但对其耗能能力和变形能力均有不利影响.

关键词: 椭圆钢管混凝土柱; 抗震性能; 试验研究; 纤维单元模型; 参数分析

中图分类号:TU398+. 9 文献标志码:A 文章编号:1002-848X(2023)12-0022-08

DOI:10. 19701 / j. jzjg. LS210380

Research on seismic behavior of elliptical concrete-filled steel tube columns

XU Youwu1, ZHU Haochuan2,3, YAO Jian1

(1 College of Architecture Engineering, Quzhou University, Quzhou 324000, China; 2 The Architectural Design& Research Institute of Zhejiang University Co. , Ltd. , Hangzhou 310027, China; 3 College of Architecture Engineering,Zhejiang University, Hangzhou 310027, China)

Abstract: In order to study the seismic behavior of elliptical concrete-filled steel tube (ECFST) columns, pseudo statictest of 8 ECFST columns with different elliptic section ratio under constant axial compression and monotonic and cycliclateral loading. The fiber element model of ECFST columns was established by using OpenSEES software to study theinfluence of elliptic section ratio, steel tube strength, concrete strength, height( slenderness ratio) and axial compressionratio on the seismic performance of ECFST columns. The results show that the horizontal load-displacement hysteresiscurves of ECFST columns are relatively plump, which indicates that the columns have good plastic deformation and energydissipation capacity. The fiber element model can accurately predict the horizontal load-displacement curve of ECFSTcolumns. The increase of elliptic section ratio, axial compression ratio and slenderness ratio has an adverse effect on theseismic behavior of ECFST columns. The increase of steel tube strength leads to the increase of bearing capacity and energydissipation capacity of ECFST columns, but leads to the decrease of deformation capacity. The increase in concrete strengthleads to the increase in bearing capacity of ECFST columns, but the decrease in energy dissipation capacity anddeformability.

Keywords:elliptical concrete-filled steel tube column; seismic behavior; experimental study; fiber element model;parametric analysis

∗浙江省自然科学基金项目(LY18E080014).

第一作者:许友武,博士,讲师,主要从事钢结构、复材-钢-混凝土组合结构教学与研究工作,Email:xuyouwu@ zju. edu. cn.

[引用本文] 许友武,朱浩川,姚谏. 椭圆钢管混凝土柱抗震性能研究[ J]. 建筑结构,2023,53(12):22-29. XUYouwu,ZHU Haochuan,YAO Jian. Research on seismic behavior of elliptical concrete-filled steel tube columns [ J].Building Structure,2023,53(12):22-29.