Anti-seismic calculation mode superposition method of hybrid structure

Abstract

The invention discloses an anti-seismic calculation mode superposition method of a hybrid structure, which comprises the following steps: S1, establishing a finite element analysis model of the structure, and further obtaining a motion equation, a mass matrix M, a rigidity matrix K and a damping matrix G of the structure; s2, obtaining a circular frequency omega j, a feature vector and a componentmodal internal force vector rj (j = 1... L) through regular modal calculation of the structure, and further calculating a damping coefficient gji (j, i = 1... L) through an equation; and S3, performing calculation by utilizing frequency domain iterative solution or time domain iterative solution to obtain node displacement x (t) or component internal force R (t), wherein t represents time. By implementing the invention, the damping matrix is clear in physical significance and simple in construction process, only one calculation result is provided, the uncertainty of the calculation result when classical damping assumption exists is avoided, and the calculation result is closer to an accurate value.

Description

technical field [0001] The invention belongs to the field of construction and relates to an anti-seismic calculation mode superposition method of a hybrid structure. Background technique [0002] For a single material structure, the modal superposition method is a time-history analysis method with high computational efficiency and low computational cost. my country's seismic code stipulates that for particularly irregular buildings, Class A buildings and high-rise buildings exceeding a certain height, it is appropriate to use the time-history analysis method for supplementary calculations. With the rapid development of my country's economy, a variety of super high-rise buildings, large-span space structures and other hybrid structures composed of different material components have emerged in various places. For example, the core material of super high-rise buildings is reinforced concrete. The component material is steel; the lower chassis material of large stadiums is reinf...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the embodiments of the present invention is that if the viscous damping assumption is adopted in the time-history analysis of the hybrid structure, the construction process of the damping matrix is ​​relatively complicated and the physical meaning is not clear, which may lead to a large difference between the calculated result and the actual value. Large, and the calculation result is not unique, which brings security risks to structural design and operation and maintenance

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