Analysis and Modelling of CFT Members: Moment Curvature Analysis
Analysis and Modelling of CFT Members: Moment Curvature Analysis
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DOI：
10.1016/j.tws.2014.10.010
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发表时间：
2015
影响因子：
6.4
通讯作者：
R. Montuori;V. Piluso
中科院分区：
文献类型：
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作者：
R. Montuori;V. Piluso
本文的主要目的是研究受非均匀弯矩作用的钢管混凝土（CFT）构件的极限性能。为此，在萨莱诺大学土木工程系材料与结构实验室进行了八项实验测试。特别是，方形空心截面（SHS）钢管混凝土构件已被调查下单调加载条件。试件采用三点弯曲方案，其中液压作动器用于在位移控制下传递跨中横向载荷，LVDT用于测量相应的最大横向位移。此外，还利用应变片测量了截面周边沿着方向的纵向变形，旨在对弯矩-曲率关系进行试验评估。本文介绍了试验试件的结构细节和相应的试验结果。此外，还提出了一种能预测钢管混凝土构件极限响应的纤维模型，并与试验结果进行了比较。纤维模型考虑了局部屈曲、混凝土约束效应、空心板单元的双向应力状态以及冷弯过程中角部硬化等对组合构件极限性能的影响，试验结果与数值计算结果吻合较好，表明了纤维模型的准确性。
The evaluation of the ultimate behaviour of Concrete Filled Tubular (CFT) members subjected to non-uniform bending moment is the main objective of this work. To this aim eight experimental tests have been performed at the Materials and Structures Laboratory of the Department of Civil Engineering of Salerno University. In particular, Square Hollow Section (SHS) CFT members have been investigated under monotonic loading conditions. The three point bending scheme is adopted for testing specimens, where an hydraulic actuator is used for the transmission of the transverse load at midspan under displacement control and an LVDT is used to measure the corresponding maximum transverse displacement. In addition, longitudinal deformations along the cross section perimeter have been measured by means of strain gauges, aiming to the experimental evaluation of moment–curvature relationship.This paper presents the structural details of the tested specimens and the corresponding experimental results. In addition, a fibre model able to predict the ultimate response of CFT members is also presented and compared with the experimental results. The presented fibre model accounts for all the effects influencing the ultimate behaviour of composite members, such as local buckling, confining effects on concrete, bi-axial stress state of the steel plate elements constituting the hollow profile and hardening of its corners due to cold forming process.The comparison between experimental and numerical results shows a good agreement pointing out the accuracy of the proposed fibre model.