Evaluation of ultimate bending moment of circular concrete–filled double skin steel tubes using finite element analysis

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2019-01-31 DOI:10.31814/STCE.NUCE2019-13(1)-03

Vũ Quang Việt, H. Ha, Pham Thai Hoan

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引用次数: 7

Abstract

In this study, the ultimate bending moment of circular concrete-filled double skin steel tubes (CFDSTs) was investigated. A CFDSTs made of two concentric circular steel tubes with concrete infill and M16 shear connector system was fabricated. The four-point bending test of the 10 m long CFDST consisting of outer and inner steel tubes with 914.4 mm and 514.4 mm in diameter, respectively, was carried out and the ultimate bending moment of the CFDST was investigated. A finite element (FE) simulation of the CFDSTs subjected to bending was developed using the commercial software ABAQUS and the accuracy of the developed FE model was verified by comparing to the experimental result. The ultimate bending moment of CFDSTs was then evaluated with respect to different concrete infill compressive strengths and yield strengths of the steel tubes. The corresponding design ultimate bending moments of the CFDST with regard to the design codes AISC and EC4 were also computed. The results revealed that EC4 and AISC can accurately predict the ultimate moment capacities of the CFDST with shear connector. Keywords: ultimate bending moment; concrete-filled double skin tube; shear connector system; finite element analysis. Received 19 November 2018, Revised 04 January 2019, Accepted 04 January 2019

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用有限元法计算圆形双层钢管混凝土的极限弯矩

本文对圆形双层钢管混凝土的极限弯矩进行了研究。制作了一种由两根同心圆钢管混凝土填充和M16剪切连接系统组成的cfdst。对直径分别为914.4 mm和514.4 mm的外钢管和内钢管组成的10 m CFDST进行了四点弯曲试验，并对CFDST的极限弯矩进行了研究。利用商业软件ABAQUS对CFDSTs进行了弯曲作用下的有限元模拟，并与实验结果进行了对比，验证了所建立的有限元模型的准确性。考虑不同的混凝土抗压强度和钢管屈服强度，计算了cfdst的极限弯矩。并根据设计规范AISC和EC4计算了相应的CFDST设计极限弯矩。结果表明，EC4和AISC能较准确地预测剪力连接件CFDST的极限弯矩承载力。关键词:极限弯矩;双层混凝土填充管;剪切连接系统;有限元分析。收稿于2018年11月19日，修订于2019年1月4日，接收于2019年1月4日

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Journal of Science and Technology in Civil Engineering (STCE) - NUCE

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