Variable-stiffness energy-dissipating joints for pipe pile heads and caps

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 connecting node in a building structure, in particular to a variable-rigidity energy-dissipating node used for connecting pipe pile heads and caps. Background technique [0002] my country is a country with frequent earthquakes, and high-intensity (greater than 8) earthquake areas are widely distributed. Prestressed concrete pipe pile foundation is one of the important forms of pile foundation. If it is to be popularized and applied in high-intensity earthquake areas, it must involve pipe Seismic design and construction of pile foundations. The mechanical analysis shows that when a strong earthquake occurs, the connection node area between the prestressed pipe pile and the cap is subjected to the combined action of the maximum bending moment, shear force and axial force at the same time, and the internal stress situation is very complicated. Seismic safety is extremely important. However, due to the characteristics of the ho...

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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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