Abstract
The critical responses are investigated for a high-rise building with a deformation-concentration seismic control system under double and multi impulses representing pulse-type and long-duration ground motions, respectively. The critical responses were studied for an elastic-plastic multi-degree-of-freedom (MDOF) shear building model under a double impulse and a multi impulse in the previous papers. However, it seems difficult to derive the critical response for a realistic three-dimensional (3-D) nonlinear frame model with a deformation-concentration seismic control system under such double and multi impulses. The criteria on the criticality of the double and multi impulses for the elastic-plastic MDOF shear building model derived in the previous research are extended to this realistic controlled 3-D frame model by regarding the sum of base story shear forces of both main and sub buildings as a key quantity. In the analysis, the concepts of “Double Impulse Pushover (DIP)” and “Multi Impulse Pushover (MIP)” introduced before are used effectively for clarifying the progressive performances for the increasing input level. The analyses of total input energy, frame hysteretic energy and damper dissipation energy are conducted and the criticality of the input derived based on the above-mentioned criteria is investigated in detail.
Highlights
In the early stage of earthquake resistant design of building structures and infrastructures, near-fault ground motions were recorded extensively all over the world and used as principal design ground motions (Bertero et al, 1978; Mavroeidis et al, 2004; Kojima and Takewaki 2015a)
Compared to an elastic-plastic SDOF model and an elasticplastic single MDOF shear building model, it is complicated to derive the critical response for such complex 3-D nonlinear frames with connected sub frames
A new approach aimed for multi frames was developed based on a criterion on the criticality of input timing of the double and multi impulses for the elasticplastic multi-frame model and the concepts of “Double Impulse Pushover (DIP)” and “Multi Impulse Pushover (MIP)” introduced in the previous paper were extended
Summary
In the early stage of earthquake resistant design of building structures and infrastructures, near-fault ground motions were recorded extensively all over the world and used as principal design ground motions (Bertero et al, 1978; Mavroeidis et al, 2004; Kojima and Takewaki 2015a). It can be observed that the excessive interstory drift responses of the main and sub frames in the first story do not appear different from in the case under the double impulses It appears that the maximum responses under all the input levels attain the minimum for Cd 2.0 × 104[kNs/m] and those responses for Cd 4.0 × 104 [kNs/m] exhibit larger values.
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