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Experimental study on progressive collapse resistance of steel frames under a sudden column removal scenario

机译:突然拆除立柱情况下钢框架的渐进抗倒塌性能试验研究

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A comprehensive experimental apparatus for the progressive collapse testing of steel frames has been developed. The apparatus is suited for the testing of planar steel frames to study the load transfer process and the progressive collapse resistance of steel structures under a column removal scenario. In order to simulate a sudden removal of a middle column at the ground storey of the frames, a removable column unit has been designed to allow for an instantaneous knock-out by a pendulum hammer during the test. To avoid the out-of-plane instability of the planar steel frames, an out-of-plane restraining system has been designed and integrated into the test apparatus. Weights simulating the desired gravity loads were attached to the test frame through holding baskets, which were designed to minimize unwanted shaking and ensure that the suspended baskets moved together with the deformed steel frames during the tests. Experimental results showed that the column removal mechanism in the test apparatus was effective. Using this apparatus, the dynamic behaviour of three planer steel frames under a column removal scenario was investigated. Based on the measured deformations and strains, the dynamic response, collapse modes, load transfer path of the steel frames after the removal of the middle bottom column are studied. (C) 2018 Elsevier Ltd. All rights reserved.
机译:已经开发出用于钢框架渐进倒塌测试的综合实验设备。该设备适用于测试平面钢框架,以研究卸荷情况下钢结构的载荷传递过程和渐进抗倒塌性。为了模拟中间机架在机架地面的突然移出,设计了可移动的立柱单元,以允许在测试过程中通过摆锤进行瞬时敲除。为了避免平面钢框架的平面外不稳定性,已经设计了平面外约束系统并将其集成到测试设备中。通过支撑篮将模拟所需重力载荷的配重连接到测试框架,该支撑篮旨在最大程度地减少不必要的晃动,并确保悬挂的篮在测试过程中与变形的钢架一起移动。实验结果表明,该测试装置中的色谱柱去除机理是有效的。使用该设备,研究了在拆除立柱的情况下三个平板钢框架的动态行为。根据实测的变形和应变,研究了拆除中底柱后钢框架的动力响应,破坏模式,荷载传递路径。 (C)2018 Elsevier Ltd.保留所有权利。

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