A Displacement-Based Seismic Design Method for Engineering Structures

Abstract

The invention provides an engineering structure seismic design method based on displacement. The engineering structure seismic design method based on the displacement includes: determining a design code response spectrum according to initial conditions, and building an elastic displacement response spectrum; determining an initial target displacement shape of an engineering structure; enabling an elastic-plastic multi-degree of freedom system to be simplified into an elastic multi-degree of freedom system; performing modal analysis on the elastic multi-degree of freedom system to obtain a target displacement shape of the engineering structure; enabling the elastic multi-degree of freedom system to be simplified into an equivalent single-degree of freedom system; performing seismic design based on the elastic displacement response spectrum; enabling seismic design force to be assigned to the multi-degree of freedom system according to the principle that the seismic design force is in proportion with elastic stiffness, and performing cross section checking calculation and reinforcement design; and solving novel target displacement, comparing size of target displacement values, and guaranteeing convergence of the target displacement. The engineering structure seismic design method based on the displacement enables displacement response of the engineering structure under seismic effect to be close to designed target displacement, thereby achieving effective control of deformation of the engineering structure under the seismic effect and guaranteeing that the engineering structure has enough displacement capacity.

Description

technical field [0001] The invention belongs to the technical field of civil engineering construction, and relates to an engineering structure anti-seismic design method, more specifically, relates to a displacement-based anti-seismic design method of an engineering structure. Background technique [0002] The seismic design of engineering structures is the main means to ensure the safety and applicability of engineering structures when earthquakes occur. The seismic design of engineering structures in various countries is based on the seismic design codes of various countries. [0003] Articles 5.2.1 and 5.2.2 of my country's "Detailed Rules for Seismic Design of Highway Bridges" (JTG / TB02-01-2008) stipulate that the acceleration response spectrum with a damping ratio of 0.05 is used as the design seismic acceleration response spectrum. The seismic load is calculated based on the property coefficient, and the seismic design is carried out. This seismic design method knows t...

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Problems solved by technology

Considering the structural performance target, the expected performance level is only indirectly expressed by the importance coefficient of the structure, and the performance level of the structure has not been specifically quantified, so the structural performance level obtained according to the design is not clear

[0005] 2. The actual seismic capacity of the engineering structure is insufficient

The designed structure can only indirectly establish its seismic performance by providing sufficient stiffness and strength. The structural displacement does not directly participate in the design as a control parameter, so it is impossible to accurately predict the actual seismic performance of the engineering structure. Seismic capacity may still be insufficient

[0006] 3. It is impossible to effectively control the deformation of engineering structures under earthquake action

The design process fails to consider the hysteretic characteristics of the structure, cannot predict the failure mechanism of the structure, and cannot directly consider the internal force redistribution of the structure during the yield process and the degradation of structural strength and stiffness, so it is difficult to grasp the real deformation of the structure under earthquakes reaction

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