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什么情况下会发生大偏心受压破坏?简要描述其破坏过程。

问答题
2022-01-04 15:47
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正确答案

其发生于轴向力N的相对偏心距较大,且受拉钢筋配置得不太多时。在靠近轴向力作用的一侧受压,另一侧受拉。随着荷载的增加,首先在受拉区产生横向裂缝,荷载不断增加,受拉区的裂缝随之不断地开展,在破坏前主裂缝逐渐明显,受拉钢筋的应力达到屈服强度,进入流幅阶段,受拉变形的发展大于受压变形,中性轴向受压区移动,然后使混凝土受压区高速迅速减小,最后受压区边缘混凝土达到其极限压应变值。出现纵向裂缝而混凝土被压碎,构件即告破坏。


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