Pier energy dissipation and anti-crushing structure with replaceable composite boards internally provided with steel bar dampers

Abstract

The invention discloses a pier energy dissipation and anti-crushing structure with replaceable composite boards internally provided with steel bar dampers. According to the structure, the replaceable Ultra High Performance Concrete (UHPC) internally provided with steel bar dampers are used for improving the energy dissipation capacity of a dry joint section spliced pier under excitation of an earthquake effect and preventing a bottom section from being crushed. Each of the four edges of a vulnerable region, namely the bottom section of the dry joint section spliced pier is provided with two UHPC boards, prestress is applied through finish rolled threaded reinforcing steel bars to combine the UHPC boards and the bottom section into a whole, and a hole channel is reserved between every two adjacent UHPC boards and used for containing the corresponding steel bar damper composed of a flexible steel core bar and a round steel casing pipe. By the adoption of the structure, the character that UHPC is cracked but not broken due to the mixture of steel fibers is used for preventing the inner bottom section from being crushed under excitation of the earthquake effect, the steel bar dampers in the hole channels are prevented from being rusted by the utilization of the character that the UHPC structure is compact, and the steel bar dampers are used for improving the energy dissipation capacity of the pier under excitation of the earthquake effect.

Description

technical field [0001] The invention relates to a rapid construction technology and an anti-seismic design method of a bridge in a medium-high intensity area, in particular to a segmental assembly technology, an external prestressing technology and a shock absorption and isolation technology using metal materials to consume energy, and belongs to the field of civil engineering. Background technique [0002] Due to the advantages of rapid construction and self-resetting ability, dry joint segmental assembled piers have been applied in some river-crossing and sea-crossing bridges, including the Hong Kong-Zhuhai-Macao Bridge and the Canadian Confederation Bridge. This type of bridge pier divides the pier body into several sections vertically, the longitudinally stressed steel bars are broken at the joints of the sections, and the sections are connected by "dry joints" or filled at the joints. Epoxy resin is used to improve the durability of the piers, and then the segments are ...

AI Technical Summary

Problems solved by technology

Although this method can improve the energy dissipation capacity of the bridge pier, it will also increase the residual deformation of the bridge pier after the earthquake, and the built-in energy dissipation steel bars are not easy to replace after the earthquake

[0004] Aiming at the problem that the bottom section of piers assembled with dry joint sections is easy to be crushed under earthquake excitation, the most widely used method in engineering is to add constraints to the concrete at the bottom section to improve the deformation capacity of the concrete, including adding constraints to the concrete at the bottom section The amount of stirrups, the use of concrete-filled steel tubes to make the bottom segment, or wrapping FRP outside the concrete of the bottom segment can indeed reduce the damage of the bottom segment under earthquake excitation, but the damaged concrete is also difficult to replace after the earthquake question

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