A bridge tower transverse seismic structure and its design method

Abstract

The invention relates to a bridge tower transverse anti-seismic structure and a design method thereof. The bridge tower transverse anti-seismic structure comprises a foundation bearing platform and abridge tower arranged on the foundation bearing platform; the bridge tower comprises two symmetrically arranged tower columns and a lower cross beam horizontally arranged between the middle lower parts of the two tower columns; bending energy consumption devices are arranged at the two ends of the lower cross beam; the upper ends of the two tower columns are connected with each other through a plurality of shear energy consumption devices; and axial energy consumption devices are connected between the lower ends of the tower columns and the foundation bearing platform. According to the bridgetower transverse anti-seismic structure, the structural design is reasonable; under the action of an earthquake exceeding a fortification level, the axial energy consumption devices, the bending energy consumption devices and the shear energy consumption devices can preferentially generate elasticoplastic deformation and dissipate energy in sequence to form multiple earthquake fortifications so asto protect key members such as bridge tower columns again being damaged in earthquakes; and moreover, the energy consumption devices possess characteristics of easy changing; and the bridge tower transverse anti-seismic structure can be widely applied to structural design of cable-stayed bridge towers.

Description

Technical field: [0001] The invention relates to a transverse seismic structure of a bridge tower and a design method thereof. Background technique: [0002] Cable-stayed bridges are one of the most commonly used forms of long-span bridges. Among them, the bridge tower is one of the most important components in the cable-stayed bridge system. Under earthquake action, the seismic performance of cable-stayed bridges in the longitudinal bridge direction is generally better; but in the transverse bridge direction, the lateral seismic force is usually the control load of the bridge tower. At present, the bridge seismic design codes of various countries generally require that the pylons of cable-stayed bridges remain elastic under the design earthquake (the return period of the fortification earthquake is 2500 years). This means that the lateral seismic performance of the pylons of the existing cable-stayed bridges can only meet the seismic fortification standards, and when subj...

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Problems solved by technology

So far, none of the patents on bridge pylons involves the improvement of the seismic performance of bridge pylons, which cannot solve the problem that the main stress-bearing components faced by bridge pylons may suffer earthquake damage and the damaged components after the earthquake are difficult to repair.

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