Semi-hinged structure suitable for reducing force on pier, bearing platform and foundation under action of earthquake

Abstract

The invention relates to a semi-hinged structure suitable for reducing force on a pier, a bearing platform and a foundation under the action of an earthquake. The semi-hinged structure can play a rolein the transverse bridge direction and a longitudinal bridge direction of a bridge simultaneously. The semi-hinged structure suitable for reducing the force on the pier, the bearing platform and thefoundation under the action of the earthquake comprises sleeves, truncated rebars, connecting rebars and mortar cushion layers; the pier is arranged on the bearing platform and the truncated rebars are anchored in the pier; the lower ends of the connecting rebars stretch into and are anchored in the bearing platform, and the upper ends of the connecting rebars stretch into and are anchored in thepier; the pier and the bearing platform are connected by the connecting rebars; the mortar cushion layers are poured at the connection positions of the pier and the bearing platform and on the outer sides of the connecting rebars; and the sleeves wrap the connecting rebars at the connection positions of the pier and the bearing platform, and the contact between the connecting rebars and concrete is isolated to avoid stress concentration of the connecting rebars. Compared with the prior art, the internal force of the pier, the bearing platform and the foundation can be reduced by the semi-hinged structure, and the semi-hinged structure suitable for reducing the force on the pier, the bearing platform and the foundation under the action of the earthquake has the advantages that the foundation engineering quantity is reduced, the pier reinforcing bars are reduced, the earthquake damage to the bearing platform and the foundation is reduced, the construction is convenient, the performance is reliable, and the cost is low.

Description

technical field [0001] The invention relates to the fields of bridge engineering and earthquake engineering, in particular to a half-hinge structure suitable for reducing the stress of bridge piers, caps and foundations under earthquake action. Background technique [0002] Under earthquake action, girders, pile foundations, and caps are often used as capacity protection components and designed according to the principle of capacity protection, while bridge piers are often designed as ductile components, so that the piers form an overall ductility mechanism. However, when the cross-sectional size of the bridge piers is large (such as railway piers), it is difficult for the bridge piers to enter the ductility under the earthquake, which will cause the bridge foundation and cap to bear a large earthquake force, see image 3 , Figure 4 , image 3 , Figure 4 It is a picture of the damage of the pile foundation in the Kobe earthquake in Japan. Therefore, the key to the ductil...

AI Technical Summary

Problems solved by technology

However, under the action of earthquakes, such structures often collide with the pile head, causing damage to the pile head; there is no reliable connection between the cap and the foundation, the structure is relatively soft, and the structural displacement response is relatively large under earthquake action; in addition, when the pier is high , this kind of bridge pier still has the problem of overturning under the action of strong earthquakes, which is not suitable for high piers, and the structure is complex, the cost is high, and as a concealed project, it is difficult to inspect and repair after the earthquake

Images