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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Shake table test of a two-story steel building seismically retrofitted using gravity-controlled rocking braced frame system
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Shake table test of a two-story steel building seismically retrofitted using gravity-controlled rocking braced frame system

机译：使用重力控制摇动支撑框架系统进行地震改装的两层钢结构的摇头表测试

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This article describes a shake table test program that was conducted to investigate the seismic behavior of a half-scale two-story gravity-controlled rocking braced steel frame building. In this system, braced frame columns are designed to uplift from the foundation under severe earthquakes to reduce the seismic force demands on the frame members. Self-centering capacity is solely provided by the gravity loads carried by the rocking frame. Energy dissipative devices are added at the base of the braced frame columns to control drifts. The system can be used for new structures as well as the retrofit of seismically deficient structures. In the test program, the specimen represented a gravity-controlled rocking frame that had been proposed for seismic retrofit in a previous study. The test structure was subjected to ground motions expected for two site classes in two seismically active regions in Canada. Three different energy dissipative devices located at the rocking interface were studied: friction, friction spring dampers, and steel bars yielding in tension and elastically buckling in compression. The focus of the tests was on peak axial loads in the columns and additional moments and shears in the beams resulting from column impact upon rocking. Axial loads in the braces and columns from higher mode response were also examined. The tests revealed significant increases in beam forces due to column impacts. Large axial forces due to the second vibration mode response were measured in the second story braces. A numerical model is proposed to accurately predict the measured force demands.
机译：本文介绍了一个摇动表测试程序，以研究半尺度的两层重力控制摇动钢架建筑的地震行为。在该系统中，支撑框架柱设计成从严格地震下的基础上抬起，以减少框架构件上的地震力所需的要求。自定心容量仅由摇摆框架承载的重力载荷提供。能量耗散装置在支撑框架柱的底部添加以控制漂移。该系统可用于新结构以及地震缺陷结构的改造。在测试程序中，标本代表了重力控制的摇摆框架，该摇动框架已经在先前的研究中提出了用于地震改造。在加拿大两种地震活动区域中，预期的测试结构预期的地面运动。研究了位于摇摆界面的三种不同的能量耗散装置：摩擦，摩擦弹簧阻尼器和钢筋，伸张张力和弹性屈曲。测试的焦点是柱子轴向载荷的峰值轴向载荷以及由柱撞击撞击产生的梁中的额外时刻和剪切。还检查了括号中的轴向载荷和来自较高模式响应的柱。由于柱子冲击，测试显示梁力的显着增加。由于第二振动模式响应引起的大轴向力在第二层括号中测量。提出了一种数值模型，以准确地预测测量的力要求。

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