Seismic Behavior and Design of High-Strength Square Concrete-Filled Steel Tube Beam Columns
Seismic Behavior and Design of High-Strength Square Concrete-Filled Steel Tube Beam Columns
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DOI：
10.1061/(asce)0733-9445(2004)130:2(169
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发表时间：
2004-02
期刊：
影响因子：
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通讯作者：
A. Varma;J. Ricles;R. Sause;Le-wu Lu
中科院分区：
文献类型：
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作者：
A. Varma;J. Ricles;R. Sause;Le-wu Lu
对高强方钢管混凝土(CFT)梁柱在恒定轴力和反复变截面弯曲荷载作用下的性能进行了试验研究。研究了高强方钢管混凝土梁柱的宽厚比(b/t)、钢管屈服应力(σy)和轴向荷载水平对其性能(刚度、强度、延性和耗能)的影响。对8个循环梁柱试件进行了试验。混凝土受压和钢管局部循环屈曲影响钢管混凝土试件的循环强度和刚度。在反复荷载作用下，由于混凝土填充物的拉裂和钢管的局部屈曲，弹性截面的抗弯刚度迅速下降。循环试件的总耗能主要由破坏段(塑性铰区)的弯曲耗能决定。无论是现行的美国混凝土协会规范条款，还是修改后的《建筑规范》。
The behavior of high strength square concrete filled steel tube (CFT) beam columns subjected to constant axial load and cyclically varying flexural loading was investigated experimentally. The effects of the width-to-thickness (b/t) ratio, the yield stress (σy) of the steel tube, and the level of axial load on the behavior (stiffness, strength, ductility, and energy dissipation) of high strength square CFT beam columns were studied. Eight cyclic beam-column specimens were tested. Crushing of concrete and cyclic local buckling in the steel tube affected the cyclic strength and stiffness of the CFT specimens. The elastic section flexural stiffness under cyclic loading decreases rapidly due to tension cracking of the concrete infill and local buckling of the steel tube. The total energy dissipated by the cyclic specimens is dominated by the flexural energy dissipated in the failure segment (plastic hinge region). Both the current American Concrete Institute code provisions and the modified Architectural Inst...