Prestressed concrete constraining buckling-restrained brace

Abstract

The invention discloses a prestressed concrete constraining buckling-restrained brace. The brace comprises a cross inner core member, concrete-filled square steel tube constraining members, a hard rubber plate, long bolt shank positioning parts and prestressed tendons, wherein four concrete-filled square steel tube constraining members are made of prestressed thin-wall steel tube concrete and attached to the cross inner core member closely to form a stressed whole; the cross inner core member is made of two pieces of low-intensity high-stretchability hot rolled section steel with a T-shaped cross section, and an inner surface and an outer surface are attached to the hard rubber plate; and a circular hole is arranged in the middle of the buckling-restrained brace, and the long bolt shank positioning parts penetrate through the circular hole and connect the cross inner core member, concrete-filled square steel tube constraining members and the hard rubber plate. The prestressed concrete constraining buckling-restrained brace has the advantages that the constraining effects of concrete can be implemented fully, the cross section size of the member is reduced, high efficiency and economy are achieved.

Description

technical field [0001] The invention relates to a buckling-resistant support constrained by prestressed concrete, which belongs to the technical field of structural engineering. Background technique [0002] The ordinary steel bracing in the steel bracing frame structure will be destabilized under compression under the action of moderate and large earthquakes, resulting in a sudden decrease in the stiffness and bearing capacity of the floor, affecting the seismic safety of the structure. As a new type of anti-lateral force component, the anti-buckling brace maintains elasticity under small earthquakes and provides lateral stiffness for the main structure; under moderate and large earthquakes, the core components first enter yield and protect the main frame , and consume a large amount of seismic input energy. [0003] At present, buckling-resistant braces are mainly divided into two categories according to the peripheral restraint materials and combinations, namely steel an...

AI Technical Summary

Problems solved by technology

The former anti-buckling support has the following problems: (1) The dimensional accuracy is controlled high during fabrication, and it is difficult to ensure that the reserved gap between the inner core member and the peripheral constraining member meets the accuracy requirements; (2) Since the peripheral constraining Under the action of bending moment, and the tensile strength of concrete is very low, its cracking load limits the contribution of concrete to stiffness and bearing capacity, and cannot effectively restrain the core members, so the section of buckling-resistant support members is often relatively thick

However, calculations show that the concrete inside the rectangular steel tubes does not contribute much to the restraint of the buckling brace due to premature cracking

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