Novel energy dissipation and shock absorption type inter-tower connection structure of framing connected-tower cable-stayed bridge

Abstract

The invention relates to a novel energy dissipation and shock absorption inter-tower connection structure of a framing tower-connected cable-stayed bridge. The structure comprises bridge tower bearing platforms, bridge tower columns are fixed to the bridge tower bearing platforms, the bridge tower columns are divided into upper tower columns and lower tower columns through bridge tower cross beams arranged on the bridge tower columns, and the bottom ends of two bridge towers are connected through a combined structure bearing platform straining beam between the bridge tower bearing platforms; inter-tower steel box inclined struts are arranged between tower limbs of the lower tower columns, so that the two bridge towers form local connection; and steel corbels are installed on the tower columns at the positions of the bridge tower cross beams, and dampers are installed between the two bridge towers through the steel corbels. According to the framing tower connecting structure form provided by the invention, on the basis of not influencing the construction period of the bridge tower and not increasing the construction difficulty, the transverse bridge direction earthquake response of the bridge tower is greatly reduced, and the anti-seismic property, the safety and the economical efficiency of the bridge tower are greatly improved.

Description

technical field [0001] The invention relates to the technical field of bridge structures, in particular to a novel energy-dissipating and shock-absorbing connection structure between pylons of a cable-stayed bridge with framing pylons. Background technique [0002] my country has a vast territory and numerous mountains and rivers. In order to cross deep valleys and large rivers and meet the growing transportation needs, long-span cable-bearing bridges have gradually been widely used due to their unique advantages, mainly including cable-stayed bridges, suspension bridges, and cable-stayed suspension bridges. Hanging combination system, etc. Among them, within the span range of 200-800m, the cable-stayed bridge has good economy, and compared with the suspension bridge, its vertical stiffness and torsional stiffness are larger, the stability against wind vibration is good, and the construction difficulty is low, so It has developed rapidly in the past 20 years. [0003] With ...

AI Technical Summary

Problems solved by technology

One is a separate tower column, that is, two bridges, the bridge towers are basically not connected with each other, and are essentially two independent cable-stayed bridges. Although the force is clear, the seismic design is still designed according to a single bridge tower. The size is generally larger and the economic indicators are often higher

The second type is double-width partially connected bridge towers, that is, the cross-beams between the towers are set at the lower cross-beams of the two bridge towers to connect them, or the entire lower tower limbs are partially connected, and the middle and upper tower limbs are completely separated; The transverse connection between the bridge towers increases the transverse stiffness of the bridge towers, and compared with the single bridge, it can significantly reduce the seismic response of the bridge tower foundation in the transverse bridge direction. , the seismic response at the bottom of the upper tower column is relatively large, requiring a larger cross-sectional size; and the construction of the local connection between the beams between the towers and the lower tower limbs is complicated, which reduces the economy of the bridge

The third type is the shared pylon pylon, that is, the double-width bridge shares the inner pylon. It has a simple structure, high lateral rigidity, good stability, and relatively low cost. The layout is asymmetrical, and the spatial effect of structural force and deformation is significant; in addition, due to the shared inner tower limbs, the force change of one bridge will not only affect the bridge itself, but also affect the other bridge through the shared inner tower limbs The coupling effect is significant; moreover, the common-tower bridge tower form is only suitable for H-shaped bridge towers, because the free length of the upper tower columns is relatively large, which is not conducive to earthquake resistance

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