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工程力学  2015 

反复荷载下型钢混凝土异形柱空间角节点的破坏机理及损伤分析

, PP. 140-150

Keywords: 型钢混凝土,空间角节点,反复荷载,破坏机理,损伤分析

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Abstract:

为了研究反复荷载作用下型钢混凝土(SRC)异形柱空间角节点的破坏机理及其损伤演变过程,设计9个试件进行低周反复荷载试验,考虑了柱截面配钢形式、轴压比、加载角度和梁的形式4个变化参数。观察其裂缝发展形态,揭示其破坏机理,获取了荷载-应变滞回曲线、节点核心区剪切变形和梁截面平均曲率。基于能量守恒定律,分析了反复荷载下试件的损伤规律,并分析了各变化参数对其累积损伤的影响。研究结果表明:反复荷载作用下SRC异形柱空间角节点发生的是弯曲、剪切斜压破坏为主、扭转伴随粘结破坏为辅的破坏形态。破坏时节点核心区钢材大部分已屈服,并且型钢应变、核心区剪切角、梁截面平均曲率均随柱肢角度的增加而减小。破坏时试件的累积损伤指标介于0.69~0.84,槽钢桁架试件各级位移下的累积损伤最大;45°加载实腹配钢试件较30°加载实腹配钢试件损伤更加严重;与45°加载试件相比,0°加载试件各级位移下累积损伤程度最高增加30%;轴压比对试件的损伤影响不大;与带钢梁试件相比,带型钢混凝土梁试件累积损伤有较大程度的缓解。

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