Unconditionally stable multi-point excitation collapse explicit analysis method for super-large-span bridge

Abstract

The invention discloses an unconditionally stable multi-point excitation collapse explicit analysis method for a super-large-span bridge. The unconditionally stable multi-point excitation collapse explicit analysis method includes the steps: establishing a finite element model of the structure and defining a fiber cross section, then converting the uniformly distributed load of the structure intocentralized quality processing, and obtaining a seismic response image by using a KR algorithm. The unconditional stable explicit integral algorithm applied in the invention can make up the problems of non-convergence caused by iteration, too small step length in a loading path or display integral algorithm, low efficiency precision and the like of the implicit integral method to a great extent. The unconditionally stable multi-point excitation collapse explicit analysis method can obtain a stable solution without time step length requirements, and is high in the efficiency is high when a large-span structure and a complex structure.

Description

technical field [0001] The invention relates to an earthquake response analysis method of a long-span bridge, in particular to an unconditionally stable super-long-span bridge multi-point excitation collapse explicit analysis method. Background technique [0002] By studying the seismic response analysis of bridges under different levels of earthquakes, we can intuitively understand the displacement, acceleration and deformation of bridges in different directions in three-dimensional space through data, so that corresponding solutions can be proposed in order to strengthen various levels. The seismic capacity of bridges under different degrees of earthquakes. [0003] At present, most simulations use the New-markβ algorithm and the central difference method, but these two algorithms need to limit the size of the time step Δt. In New-markβ, only acceleration affects velocity weight β≥0.5 and acceleration affects displacement weight γ≥0.25(0.5+β) 2 , the time step size is un...

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Problems solved by technology

[0004] Purpose of the invention: In view of the deficiencies in the prior art, the purpose of the present invention is to provide an unconditionally stable multi-point excitation collapse explicit analysis method for super long-span bridges, which solves the calculation convergence problem in the seismic response analysis method in the prior art and computational stability issues

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