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Investigating the vulnerability of nonductile reinforced concrete columns in moderate seismic regions to gravity load collapse

机译：调查抗导电钢筋混凝土柱在中等地震区重力载荷塌陷中的脆弱性

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摘要

Reinforced concrete (RC) columns are important components of the lateral load-resisting structural system of RC buildings. In moderate seismic regions, where stringent seismic reinforcement detailing requirements are usually not considered, RC columns are categorized as nonductile. Postearthquake studies have shown that gravity load collapse of RC columns can trigger the progressive collapse of RC buildings. The current study presents the seismic response behavior of nonductile RC columns in moderate seismic regions, with a particular focus on gravity load collapse. Six RC columns, three with lap splices and three without lap splices with variable aspect ratios, were tested under reversed cyclic loading. Experimental results show that the column failing in shear could tolerate the maximum drift in order of 2.7-3.5%, whereas the columns failed in flexural mode could achieve the maximum drift of 4.5%. For the columns with lap splice, the lateral strength was significantly degraded, but all spliced columns could sustain gravity load even when their displacements were more than 4% drift. This very large drift without axial collapse, observed in the current study, is associated with the splice slip causing the large rotation just above the splice region.
机译：钢筋混凝土（RC）柱是RC建筑物横向载荷结构系统的重要组成部分。在通常不考虑规定要求的严格地震增强件的中等地震区域中，RC柱被分类为导域。 Postearthquake研究表明，RC柱的重力载荷塌陷可以触发RC建筑的逐步崩溃。目前的研究呈现了中等地震区中导网RC柱的地震反应行为，特别侧重于重力载荷塌陷。在反转的循环载荷下测试六个RC柱，三个带有液体接头的三个没有搭接接头，其中具有可变纵横比。实验结果表明，剪切失效的柱可以耐受2.7-3.5％的最大漂移，而弯曲模式下的柱子可能会达到4.5％的最大漂移。对于带液体拼接的柱，横向强度显着降低，但即使它们的位移超过4％漂移，所有拼接柱也可以维持重力负载。在目前的研究中观察到这种情况非常大的漂移，在目前的研究中观察到，与剪接区域上方的剪接滑移有关。

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