循环荷载下单面外包混凝土组合剪力墙混凝土板厚需求
Journal of Suzhou University of Science and Technology(Engineering and Technology)(2023)
Abstract
钢板外包混凝土组合剪力墙(C-PSW/CE)将混凝土板外覆于钢板单侧或双侧,为钢板提供平面外约束,避免钢板过早发生屈曲,使钢板抗剪强度得到充分利用.合适的混凝土板厚是C-PSW/CE抗剪强度发挥良好的关键,强震下C-PSW/CE有良好的延性是保证结构安全的前提.采用有限元模拟方法,研究了单面外包混凝土C-PSW/CE循环荷载下的承载力和钢板屈曲后抗剪机理;分析了混凝土板厚度、钢板厚度、栓钉间距、剪力墙高宽比对单面外包混凝土C-PSW/CE抗侧力性能的影响.结果表明,混凝土板厚和栓钉间距对循环荷载下C-PSW/CE承载力劣化影响很大;较小的栓钉间距是限制C-PSW/CE承载力过度劣化的有效措施,混凝土板厚度的增加对限制C-PSW/CE承载力过度劣化起关键作用.依据108个C-PSW/CE有限元算例的模拟结果,提出了罕遇地震下承载力劣化低于15%的单面外包混凝土 C-PSW/CE混凝土板厚需求.
MoreKey words
C-PSW/CE,cyclic loading,shear resistance mechanism,concrete panel thickness,finite element
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