The performance-based design method and calculation system of high-speed railway seismic isolation bridge based on energy balance principle (EEDP)

Abstract

Based on the energy balance principle (EEDP), the performance objective of high-speed railway bridges is put forward, two energy balance coefficients are calculated, an equivalent single degree of freedom system is established, and finally the performance-based design of high-speed railway bridges under different seismic fortification levels is realized. Based on the energy balance principle (EEDP), a performance-based design and calculation system for high-speed railway bridges is developed. The system includes: a seismic response spectrum conversion module, an energy balance coefficient calculation module, a design parameter calculation module and an EEDP design value and time-history analysis module. The energy balance coefficient calculation module is realized by gamma a calculation module in OpenSees, a gamma b calculation module in OpenSees and a MATLAB matching and fitting module, and the energy balance coefficient calculation module is realized by the gamma a calculation modulein OpenSees, the gamma b calculation module in OpenSees and the MATLAB matching and fitting module. The design parameter calculation module is composed of a beam body-Support-pier two-degree of freedom first mode of vibration solving module and a bearing after-sliding stiffness solving module.

Description

technical field [0001] The invention relates to a performance-based design method and a calculation system for high-speed railway shock-absorbing and isolation bridges based on the principle of energy balance (EEDP), and belongs to the technical field of railway engineering application calculation and design. Background technique [0002] In recent years, China's high-speed railway has developed rapidly. High-speed railways are mainly built in the way of "replacing roads with bridges". Bridges account for more than 50% of the line, and more than 90% of them are simply supported girder bridges. sexual demands. At the same time, as a country with a high incidence of earthquakes, most of the planned high-speed railway networks in China pass through high-intensity earthquake zones of 7 degrees and above, and high-speed railway bridges inevitably face serious earthquake threats. As a lifeline engineering bridge, it is of great significance to ensure the safety of life and struc...

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Problems solved by technology

Among domestic scholars, Wang Changfeng et al. proposed a non-iterative calculation method suitable for the design of seismically isolated bridges based on the relationship between the maximum displacement of the bilinear system and the maximum displacement of the elastic system, but in this method, the design parameters of the bridge need to be estimated in advance

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