Combined shock absorption system of high-speed railway bridge and design method of combined shock absorption system

Abstract

The invention discloses a combined shock absorption system of a high-speed railway bridge and a design method of the combined shock absorption system. The combined shock absorption system is used for reducing and controlling damage to and destruction of the high-speed railway bridge in a strong earthquake. Firstly, a design scheme of a combined shock absorption and limiting system with earthquake-proof bars and cable limiters used is provided on the basis of a function separate support design concept, earthquake response of the bridge is reduced through yield energy consumption of the earthquake-proof bars, and the cable limiters are used for controlling oversize deformation of the earthquake-proof bars and preventing damage caused by bridge fall; secondly, in the framework of performance-based seismic design, design methods of the earthquake-proof bars and the cable limiters are provided under the conditions of frequent earthquakes, design earthquakes and rare occurrence earthquakes respectively; accordingly, the earthquake response of the high-speed railway bridge is reduced, the earthquake-proof property of the structure is improved, and the combined shock absorption system of the high-speed railway bridge and the design method of the combined shock absorption system are particularly suitable for bridge structures suffering from near-fault pulse-like ground motions.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, and relates to a combined damping system and its anti-seismic design method, more specifically, to a high-speed railway bridge combined damping system and its anti-seismic design method using anti-vibration rods and cable stoppers. design method. Background technique [0002] The operating mileage and construction scale of my country's high-speed railways rank among the top in the world, and are gradually extending to western provinces. The terrain in western my country is mostly mountainous, with strong neotectonic activity and extensive development of faults (fault zones). Large active faults can stretch for hundreds or even thousands of kilometers, with high seismic hazard. In the construction of high-speed railways, bridges account for a considerable proportion. In the west, it is inevitable that they are adjacent to or cross active faults. At the same time, there may be unexplore...

AI Technical Summary

Problems solved by technology

However, compared with highway bridges, high-speed railway bridges have much stricter control indicators for beam displacement. For high-speed railway bridges using anti-seismic rods, it is difficult to effectively control the relative displacement of pier beams under rare earthquakes due to the low stiffness of the anti-seismic rods after yielding. , especially under the action of near-fault ground motion with velocity pulse waveform (Wang Yan, Xie Xu, Shen Yonggang. Research on Seismic Response of Railway Shock-absorbing Bridges Under Near-field Earthquake[J]. Journal of Railway Science. 2012,34( 12):102-109.)

The current function-based seismic design lacks a comprehensive design method and does not introduce cable stoppers to control the relative displacement of pier beams

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