不锈钢管再生混凝土短柱轴压力学性能研究

兰州理工大学学报 ›› 2023, Vol. 49 ›› Issue (6): 129-137.

不锈钢管再生混凝土短柱轴压力学性能研究

马海兵¹, 胡永胜¹, 张文浩², 赵晖^*2, 沈玲华²

1.山西平榆高速公路有限责任公司,山西太原 030000;
2.太原理工大学土木工程学院, 山西太原 030024

收稿日期:2022-11-18 出版日期:2023-12-28 发布日期:2024-01-05
通讯作者: 赵晖(1988-),男,山西孝义人,博士,副教授.Email:zhaohui01@tyut.edu.cn
基金资助:
中国博士后科学基金(2020M670656),山西省自然科学基金(20210302124208)

Behavior of recycled aggregate concrete filled stainless steel tube (RA-CFSST) stub columns under axial compression

MA Hai-bing¹, HU Yong-sheng¹, ZHANG Wen-hao², ZHAO Hui², SHEN Ling-hua²

1. Shanxi Pingyu Expressway Co. Ltd., Taiyuan 030000, China;
2. College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024,China

Received:2022-11-18 Online:2023-12-28 Published:2024-01-05

摘要/Abstract

摘要： 不锈钢管再生混凝土柱(RA-CFSST)可有效改善核心再生混凝土的力学性能,在桥梁墩柱与海工结构中具有广泛的应用前景.基于前期试验研究采用ABAQUS有限元软件对RA-CFSST短柱进行了轴压全过程机理分析,包括各部件应力状态发展、核心再生混凝土应力分布以及钢-混凝土之间的接触应力;其次,重点研究了再生混凝土强度、取代率、不锈钢类型与含钢率对构件极限承载力的影响;最后基于前期试验和参数分析结果,与国内外现有钢管混凝土设计规范进行了对比.研究结果表明:轴压过程中,钢管环向应力与核心混凝土纵向应力不断增大,呈明显的约束效应;构件极限承载力受材料强度和含钢率影响较大,而受再生粗骨料的影响较小.

关键词: 不锈钢管再生混凝土, 约束效应, 轴压, 有限元分析, 机理分析, 设计规范

Abstract: Recycled aggregate concrete filled stainless steel tube (RA-CFSST) have gained significant attention for their potential to enhance the mechanical behaviour of recycled aggregate concrete (RAC), especially in applications like bridge piers and marine structures. In this paper, the ABAQUS finite element (FE) software was used to analyze the behavior of RA-CFSSTs under axial compression. The stress states of stainless steel and core RAC were investigated based on reliable FE models. Stress distribution of core RAC and contact pressure between steel tube and concrete were analyzed. Afterwards, a parametric analysis was performed to evaluate the influences of concrete strength, coarse recycled aggregate replacement ratio, types of stainless steel and steel ratio on the axial compression response. Furthermore, a comparative assessment is made with existing design provisions for the CFSTs and RAC-FSTs, both domestically and internationally, based on experimental results and parametric analyses.The results show that the circumferential stress of steel tube and vertical stress of core RAC continuously increased under axial compression, indicating an obvious confinement effect. The ultimate load-carrying capacity of RA-CFSSTs is found to be primarily influenced by material strength and steel content, while the effect of recycled coarse aggregates was minor.

Key words: recycled aggregate concrete filled stainless steel tube (RA-CFSST), confinement effect, axial compression performance, finite element analysis, mechanism analysis, design provision

中图分类号:

TU398

马海兵, 胡永胜, 张文浩, 赵晖, 沈玲华. 不锈钢管再生混凝土短柱轴压力学性能研究[J]. 兰州理工大学学报, 2023, 49(6): 129-137.

MA Hai-bing, HU Yong-sheng, ZHANG Wen-hao, ZHAO Hui, SHEN Ling-hua. Behavior of recycled aggregate concrete filled stainless steel tube (RA-CFSST) stub columns under axial compression[J]. Journal of Lanzhou University of Technology, 2023, 49(6): 129-137.

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