Prestressed concrete-filled steel tube buckling-restrained supporting member
A technology of anti-buckling bracing and concrete-filled steel tubes, which is applied to building components, earthquake resistance, etc., can solve the problems of reducing the energy consumption capacity of buckling-resistant bracing components, reducing the bending stiffness of peripheral constrained components, and weakening the bending stiffness, so as to improve the peripheral constraints. Rigidity, save material, improve the effect of bearing capacity
Inactive Publication Date: 2015-11-11
TSINGHUA UNIV
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Problems solved by technology
Due to the low tensile strength of concrete in the traditional anti-buckling support members, the concrete will be cracked under the action of a small bending moment, thereby reducing the bending stiffness of the peripheral restraint members, and because the concrete is impossible to crack under tension Restoration, so this weakening of the bending stiffness of the peripheral constraining members is permanent, which will seriously reduce the energy dissipation capacity of the buckling-resistant bracing members under the action of moderate and large earthquakes
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[0015] By comparing the traditional anti-buckling bracing member and the prestressed steel pipe constrained anti-buckling bracing member proposed by the present invention, the difference in mechanical performance between the two will be further explained. Note that the inner core of the anti-buckling brace bears axial pressure N, assume that the extrusion force between the peripheral constraining member and the inner core member is distributed in a single-wave sinusoidal pattern, and the amplitude of the mid-span extrusion force is q 0 , axial pressure N and q 0 Satisfy a linear relationship between them, that is, the distribution function of the extrusion force is q=q 0 sin(πx / L), where L is the length of the peripheral constraining member. The outer restraint members are in bending state under the action of extrusion force, and the mid-span bending moment is the largest, so the mid-span concrete is most likely to crack. After applying prestress to the outer restraint membe...
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The invention relates to a prestressed concrete-filled steel tube buckling-restrained supporting member, comprising a concrete-filled steel tube buckling-restrained supporting member. The prestressed concrete-filled steel tube buckling-restrained supporting member is characterized by further comprising prestressed cables; four prestressed cables are evenly distributed on the circumference of a core dissipative member along full length of the supporting member; at two ends of a peripheral restraining member, the prestressed cables apply prestress to concrete. The peripheral restraining member extends out from the end of the core dissipative member of the buckling-restrained supporting member; section is enlarged, an extension of great flexural rigidity is formed; the extension is hinged to or rigidly connected with a frame member through connecting boards and high-strength bolts. After the concrete is prestressed, the problem of early cracking of the concrete caused by bending of the peripheral restraining concrete-filled steel tube member is solved, the flexural rigidity of the peripheral retraining member is never decreased due to tensile cracking of the concrete, the characteristic, namely high compressive bearing capacity, of the concrete is made full use, and bearing capacity of the buckling-restrained supporting member is improved.
Description
technical field [0001] The invention relates to a novel prestressed concrete-filled-steel-concrete constrained anti-buckling support member, which aims to provide a support energy-dissipating member with greater bearing capacity and better performance, and provide the structure with lateral force resistance under the action of small earthquakes. Energy dissipation and shock absorption under the action of moderate and large earthquakes. It belongs to the technical field of structural engineering. Background technique [0002] The anti-buckling support member is generally composed of two parts: the inner core member and the outer restraint member. It is a new type of lateral force-resistant member with excellent energy dissipation and shock absorption effects. Under the action of small earthquakes, the inner core of the anti-buckling support members maintains elasticity, providing sufficient lateral stiffness for the main structure; Under the action of repeated compressive l...
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IPC IPC(8): E04B1/98
Inventor 郭彦林陈航朱博莉
Owner TSINGHUA UNIV