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However, the ratio of the friction energy to the input energy is roughly constant for the seismic motions of which maximum velocity is 0.3 ~ 0.5m/s.

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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 seismic design load of such buildings in Japan. Although the seismic response reduction effect with load slipping, hereinafter referred to as the load slipping effect (slip 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 slip effect for an elasto-plastic frame, shaking table tests were carried out on a single-story elasto-plastic steel frame while varying the experimental parameters including the yield shear force of the frame. In order to incorporate the slip effect for various designs of general buildings, an analytical model with load slipping was constructed based on the results of static experiments. Based on the results of the shaking table tests and seismic response analyses, following results were found. 1) The slip effect was increased with decreasing dynamic friction coefficient of the weight and increasing maximum velocity of input seismic motion.2) The slip effect was increased with increasing maximum slip displacement and cumulative displacement of 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.