Galvanized welded steel wire mesh beam end structure and method for improving ductility of beam end bottom pressure zone
A technology of steel wire mesh and monofilament, which is applied to the beam end structure of galvanized welded steel wire mesh and the ductility of the lower compression zone of the enhanced beam end, the beam end structure and its enhanced ductility, and can solve the problem that the energy dissipation capacity of the beam end has not been fully utilized , the limit state of bearing capacity is not considered, and the loss of bearing capacity is not considered, so as to achieve the effect of simple and fast construction, low construction difficulty and energy consumption
Inactive Publication Date: 2013-04-10
BEIJING UNIV OF TECH
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Problems solved by technology
The steel bars parallel to the beam ribs in the slab participate in the joint work of the steel bars at the beam end to resist the negative bending moment. At present, in the structural design, only the stiffness increase coefficient is used approximately in the overall calculation of the structure and in the limit state of normal use to consider this effect. The load-carrying capacity limit state of the beam is often not considered
In the limit state of bearing capacity, due to the participation of the floor, the rigidity of the upper area of the beam end is enhanced. As the concrete at the lower part of the beam end is crushed and slag falls off, the bearing capacity is quickly lost, the energy dissipation capacity of the beam end is not fully utilized, and the ductility is very low. Difference
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[0026] 1. Steel bar binding
[0027] The production and binding of beam reinforcement must be carried out in strict accordance with the drawings and specifications. After the longitudinal reinforcement 6 at the bottom of the beam, the longitudinal reinforcement 7 at the upper part of the beam, and the stirrup 5 of the beam are bound and formed, stepping on them is strictly prohibited to prevent deformation of the reinforcement cage.
[0028] 2. Wire mesh cutting and bending
[0029] The length H of galvanized welded steel wire mesh 0 Take the greater value of 1.5 times the beam height and 500mm, width B 0 is 2(L-a′ s -5mm)+2(B-2×5mm)+2S, where L is beam height, B is beam section width, S is lap width of beam top galvanized welded steel mesh, a' s is the distance from the resultant force point of the longitudinal reinforcement on the upper part of the beam to the compression edge of the section.
[0030] The specific bending steps are:
[0031] Take the middle line of galv...
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The invention relates to a galvanized welded steel wire mesh beam end structure and a method for improving ductility of a beam end bottom pressure zone, and belongs to the field of building engineering construction technologies. In the invention, a galvanized welded steel wire mesh is tied to the outer side of a beam end steel reinforcement cage and concrete is poured, and thus realize the methodfor improving ductility of a beam end plastic hinge zone surrounded by two sides and the bottom is realized. The method comprises concretely the following steps of steel reinforcement colligation, steel wire mesh clipping and bending, galvanized welded steel wire mesh installation and concrete pouring and vibration. The galvanized welded steel wire mesh beam end structure and the method can improve ductility of a beam, and working conditions of concrete in a beam end pressure zone.
Description
technical field [0001] The invention relates to a beam end structure and a method for enhancing ductility thereof, in particular to a beam end structure of galvanized welded steel wire mesh and a method for enhancing the ductility of the compression zone at the lower part of the beam end, belonging to the technical field of construction engineering. Background technique [0002] High-rise buildings generally adopt cast-in-place floors or prefabricated floors, and the floor is used as the effective flange of the beam to form a T-shaped cross-section beam, which improves the rigidity of the floor beam. The steel bars parallel to the beam ribs in the slab participate in the joint work of the steel bars at the beam end to resist the negative bending moment. At present, in the structural design, only the stiffness increase coefficient is used approximately in the overall calculation of the structure and in the limit state of normal use to consider this effect. The limit state of ...
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IPC IPC(8): E04C3/20E04C5/02E04C5/04E04G21/12
Inventor李振宝赵培忠张德晶
OwnerBEIJING UNIV OF TECH