Seismic performance analysis method for falling layer frame structure

Abstract

The invention discloses a seismic performance analysis method for a falling layer frame structure. The method comprises step 1 of establishing a falling layer frame structure model on slope land; step2 of selecting a seismic wave according to the principle of achieving consistency of spectral characteristics; step 3 of inputting, by a lower grounding layer column base, the seismic oscillation acceleration time history of the selected seismic wave, and inputting, by an upper grounding layer column base, lambda times the seismic oscillation acceleration time history of the selected seismic wave, wherein lambda is a horizontal seismic oscillation amplification coefficient of an upper ground layer; and step 4 of calculating a seismic performance index, wherein the seismic performance index includes a maximum interlayer displacement angle, the shear force of an upper grounding layer column, the rod end ductility coefficient ratio, and the rod end rate of plastic hinges. According to the seismic performance analysis method for the falling layer frame structure, the technical problem of overestimating the anti-seismic performance of the falling layer frame structure in the prior art is solved, errors of the anti-seismic performance analysis of the falling layer frame structure is corrected, and the anti-seismic performance index which is more in line with the actual seismic demand isobtained.

Description

technical field [0001] The invention belongs to the technical field of mountain buildings, and in particular relates to a method for analyzing the anti-seismic performance of a frame structure with dropped floors. Background technique [0002] The grounding form of mountain buildings is the expression and generalization of the relationship between mountain buildings and mountain topography. It not only determines the degree of change of the mountain surface by the construction of the building, but also determines the structural formation of the building itself. As a common architectural form in mountain architecture, the drop-story frame structure is widely used. The structure is built on the mountain, which can adapt to the terrain well and achieve the ideal architectural effect. The drop-off frame structure is different from the ordinary frame structure. The essential difference is that there are two different grounding layers in the drop-off frame structure, that is, the ...

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Problems solved by technology

However, in the current research on mountainous building structures, the simplified processing method of the seismic performance analysis model of frame structures with dropped floors is mostly the same as that of ordinary frame structures, that is, fixed ends are set at the grounding points, and the upper members are divided into rod units. The upper and lower grounding layers are input consistently. This simplified method does not take into account the amplification effect of the upper grounding layer on the ground motion, resulting in an overestimation of the seismic capacity of the frame structure with the dropped floor and ignoring the damage degree of the dropped layer. The anti-seismic performance design of the floor frame structure is extremely unfavorable, and the seismic capacity of the designed drop-story frame structure is not enough to deal with the actual earthquake, so it brings great safety hazards

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