Pier energy-consuming and anti-crushing structure capable of replacing internal energy-consuming reinforcing steel bars of composite board

Abstract

The invention discloses a pier energy-consuming and anti-crushing structure capable of replacing internal energy-consuming reinforcing steel bars of a composite board. The structure is characterized in that two UHPC plates are arranged on an easily-damaged area of a pier assembled by dry joint sections, namely at each of four sides of a pier bottom section; pre-stress is applied by a fine-rolled thread reinforcing bar, so that the UHPC plates are combined with the bottom section to form an integer; hollow passages are reserved between the two UHPC plates, and are used for placing the energy-consuming reinforcing steel bars. According to the pier energy-consuming and anti-crushing structure, the UHPC plates have the property of cracking but not crushing due to the fact that steel fibers are mixed in, so that the inner bottom section is prevented from being crushed under excitation of seismic action; the energy-consuming reinforcing steel bars in the hollow passages are prevented from rusting by utilizing the compact property of the UHPC structures; meanwhile, the UHPC plates around the hollow passages can prevent the energy-consuming reinforcing steel bars from buckling failure while stressed; the energy-consuming reinforcing steel bars are used for improving energy-consuming capacity, under the excitation of seismic action, of the pier assembled by the dry joint sections, so that the pier is guaranteed to have good energy-consuming capacity and can prevent the bottom section from being severely crushed under the excitation of seismic action; and moreover, quick repair on the pier is realized by replacing the UHPC plates and the energy-consuming reinforcing steel bars after an earthquake.

Description

Technical field [0001] The invention relates to a bridge rapid construction technology and an earthquake-resistant design method in a medium-to-high intensity area, in particular to a segment 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 bridge piers have been used in engineering applications in some river-crossing bridges including the Hong Kong-Zhuhai-Macao Bridge and the Canadian Federal Bridge. This type of pier is to divide the pier body into several sections along the vertical direction. The longitudinally stressed steel bars are disconnected 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 pier...

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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