Earthquake damage control system for thin-walled hollow bridge piers

Abstract

The invention discloses a novel earthquake damage control system for a thin-wall hollow pier. The novel earthquake damage control system comprises a pier base, a thin-wall hollow pier, high-tenacity fiber-enhanced cement-based composite material expanded sections, an unbonded prestressed tendon and steel energy consumption elements, wherein the thin-wall hollow pier is arranged on the upper end surface of the pier base, so that the torsional strength and the energy-dissipating capacity of the thin-wall pier are improved. The high-tenacity fiber-enhanced cement-based composite material expanded sections are arranged on the inner side and the outer side of the lower part of thin-wall hollow pier; a series of steel energy consumption elements are arranged in the thin-wall hollow pier along the pier height; the lower part of the unbonded prestressed tendon is anchored on the pier base; and the upper part of the unbonded prestressed tendon is anchored at the center of the first steel energy consumption element from bottom to top. By virtue of the unbonded prestressed tendon, the self-resetting capacity of the pier after the earthquake is provided; and the crack width of the pier after the earthquake is reduced. By virtue of the high-tenacity fiber-enhanced cement-based composite material expanded sections, the axis-compression ratio of the bottom section of the thin-wall hollow pier is reduced; the shear-bearing capacity and the anti-bending capacity of the thin-wall hollow pier are increased; and the steel energy consumption elements can be arranged as rapid exchange components, so that the repairability after the earthquake is increased.

Description

technical field [0001] The invention relates to a novel bridge structure system, in particular to a thin-walled hollow bridge pier utilizing prestressed tendons, high-toughness fiber-reinforced cement-based composite material (ECC) and steel plate energy-dissipating devices. Background technique [0002] Thin-walled hollow piers are widely used in high-pier and long-span bridge structures, which belong to the "throat" of traffic lifeline projects. Once damaged after an earthquake, it will cause extremely serious losses. The weak points of seismic resistance of thin-walled hollow piers are mainly reflected in: (1) Since thin-walled hollow piers are generally high piers, even a small residual displacement angle can cause a large lateral deformation of the top of the pier, so the control of such structures The post-earthquake residual displacement is extremely important. (2) Thin-walled hollow piers have weak shear and torsional resistance, and are prone to shear and torsional...

AI Technical Summary

Problems solved by technology

(2) Thin-walled hollow piers are weak in shear and torsional resistance, prone to shear and torsional damage under earthquakes, and thin-walled structures are prone to local and overall instability damage

(3) The bottom of a large number of thin-walled hollow piers is located underwater. Once cracked under the action of an earthquake, the durability of the piers will be seriously affected, and post-earthquake repairs are extremely difficult

Therefore, it is difficult to control the earthquake damage of such piers.

During the 2008 Wenchuan Earthquake, the thin-walled hollow piers of the Miaoziping Bridge were cracked and damaged. Since some of the piers were underwater, their durability could not be satisfied and they had to be repaired, which cost a lot of money.

Therefore, adopting a suitable seismic damage control design method to reduce the seismic damage of thin-walled hollow piers has always been the goal pursued by engineers, and it has not been solved well.

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