​FUNDAMENTAL EXPERIMENT AND ANALYTICAL STUDY OF SEISMIC RESPONSE REDUCTION EFFECT WITH LOAD SLIDING OF AN ELASTOPLASTIC FRAME ADDITIVE DAMPING RATIO BY LOAD SLIDING

Year 2018, Volume: 3 Issue: 2, 54 - 67, 01.04.2018

Ryo Sasakı Kunıakı Yamagıshı

Abstract

The design load for structural design and for calculating the seismic force of building the live load of which is larger than the dead load, such as warehouses, is set depending on the engineering judgment of structural designers because there is no regulation regarding the design load of such buildings in Japan. Although the seismic response reduction effect with load sliding, hereinafter referred to as the load sliding effect slide effect , is not considered in typical structural design, consideration of this effect may contribute to a rational structural design. In the present study, in order to obtain the basic characteristics of the slide effect for an elastoplastic frame, including the yield shear force of the frame, shaking table tests were carried out on a single-story elastoplastic steel frame while varying the experimental parameters. In order to incorporate the slide effect for various designs of general buildings, an analytical model with load sliding was constructed based on the results of static experiments. In addition, the additive damping ratio due to the slide effect was analytically calculated in order to evaluate the slide effect using design variable. Based on the results of the shaking table tests and seismic response analyses, we found the followings: 1 The slide effect increased with decreasing dynamic friction coefficient of the weight and increasing maximum velocity of the input seismic motion. 2 The slide effect increased with increasing maximum sliding displacement and cumulative sliding displacement of the weight. 3 The response tendencies of the frame and weight of the analytical results for the parameters of interest generally agreed with the experimental results. 4 The additive damping ratio due to weight sliding increased with increasing mass ratio and decreasing coefficient of dynamic friction of the weight

Keywords

structural design, seismic force, elastoplastic frame, slide effect

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