Variable rigidity energy consumption type joint for connecting tubular pile head with bearing platform

Abstract

The invention relates to a connection joint in a building structure, in particular to a variable rigidity energy consumption type joint for connecting a tubular pile head with a bearing platform. The variable rigidity energy consumption type joint comprises two disc-shaped spring structures of the same structure, a flexible outer packaging shell, a concrete expansion head, multiple bearing platform connecting anchor bolts and multiple pile head connecting anchor bolts. The disc-shaped spring structures are arranged between the bearing platform and the tubular pile head, the flexible outer packaging shell covers the two disc-shaped spring structures, and the concrete expansion head is poured to the tubular pile head. When the joint receives large external bending moment or shearing force or axial force, the spring structures provide certain resistance and can generate proper elastic corners or elastic deformation, seismic energy can be consumed, the bearing platform connecting anchor bolts and the pile head connecting anchor bolts are matched with the two disc-shaped spring structures, compression-resistant, tensile, bending-resistant and shearing-resistant bearing force needed when the static load or the movable load effect is achieved can be provided, and when the external effect disappears, the joint can be elastically reset and can be used without being restored.

Description

technical field [0001] The invention relates to a connection node in a building structure, in particular to a variable stiffness energy-consuming node used for connecting a pipe pile head and a bearing platform. Background technique [0002] my country is a country with frequent earthquakes. High-intensity (greater than 8 degrees) seismic areas are widely distributed. As one of the important forms of pile foundations, prestressed concrete pipe pile foundations must be widely used in high-intensity seismic areas. Seismic design and construction of pile foundations. The force analysis shows that the connection node area between the prestressed pipe pile and the bearing platform is simultaneously subjected to the combined action of the maximum bending moment, shear force and axial force under strong earthquake action. seismic safety is extremely important. However, due to the characteristics of the hollow section of the PHC pipe pile, the pile body is obviously weaker than...

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Problems solved by technology

It is generally believed that the former belongs to the hinge connection node, and the latter belongs to the rigid connection connection node, but in fact the former can also provide a certain resistance to bending moment, and the latter can also produce a certain degree of rotation angle. Under the action of strong earthquakes, the two kinds of nodes are both The seismic energy is consumed at the expense of the destruction of its own materials (such as concrete cracking and crushing, and steel bar yielding). Since the connection nodes between the pile head and the cap are buried in the soil below the ground, it is extremely difficult to damage the above nodes. detection and repair

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