End unbonded unequal strength reinforced concrete beams

A reinforced concrete beam, non-bonded technology, applied in the field of reinforced concrete beams and high-strength reinforced concrete beams, can solve problems such as large residual deformation of longitudinal bars, improve ductility and energy dissipation capacity, be economical, and reduce residual deformation. Effect

Active Publication Date: 2016-08-17
南通翰坤建筑材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the conventional design, the longitudinal reinforcement of the beam is symmetrically reinforced according to the bearing capacity requirements, which will cause the longitudinal reinforcement to reach the yield limit at the same time under the load, resulting in large residual deformation

Method used

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  • End unbonded unequal strength reinforced concrete beams
  • End unbonded unequal strength reinforced concrete beams
  • End unbonded unequal strength reinforced concrete beams

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] 1. Cut the bellows and fill the foam plug.

[0037] The maximum diameter of the longitudinal reinforcement used is d 0 , choose a diameter of 1.5d 0 The bellows, the bellows according to the effective height h of the beam section 0 Make a cut. Make a diameter of 1.5d 0 Cylindrical foam plugs with a height of 1 / 10h 0 , A round hole with a diameter smaller than that of the longitudinal rib is cut out in the center of the foam plug. Secure the foam plugs to both ends of the bellows with 914 adhesive.

[0038] 2. Fix the bellows filled at both ends to the ends of the longitudinal ribs.

[0039] The longitudinal reinforcement passes through the foam plug hole on the corrugated pipe, and the thin steel wire penetrates the corrugated pipe and fixes it with the steel bar.

[0040] 3. Binding of steel cage

[0041] The binding of the reinforcement cage must be carried out in strict accordance with the relevant specifications and drawings.

[0042] 4. Beam formwork and c...

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Abstract

The invention relates to an end unbonded reinforced concrete beam with non-equal strengths, belonging to the structural engineering field. The specific operating steps comprise preparing a corrugated pipe of which two ends are bonded with foam pads, fixing the corrugated pipe and a longitudinal bar, binding a reinforcement cage, pouring a beam formwork and concrete and vibrating. According to the end unbonded reinforced concrete beam, the corrugated pipe is fixed at the end of the longitudinal bar of the beam to achieve locally unbonded effect, the longitudinal bar is composed of an ordinary steel bar and a high-strength steel bar, the ordinary steel bar is yielded firstly under the action of repeated loading, and the high-strength steel bar is kept in an elastic deformation stage, so that the residual deformation of the beam is reduced. The length of the buckling section of the beam can be effectively increased, the energy-dissipating capacity of the beam is improved and the anti-seismic property of the beam is improved.

Description

technical field [0001] The invention relates to a reinforced concrete beam, in particular to a reinforced concrete beam with unequal strength without bonding at the end, and belongs to the field of structural engineering. Background technique [0002] Frequent earthquakes in recent years not only bring huge economic losses, but also seriously affect people's lives. The frame structure accounts for 1 / 3 of the total number of buildings in my country, and it is a relatively reasonable form of earthquake-resistant structure. The frame structure is based on the design concept of "strong column and weak beam" to ensure that the structure can improve the seismic performance of the beam under the premise of reasonable force. Under earthquake action, there will be three types of failure modes in the frame structure: column-hinge mode, beam-column-hinge mode, and beam-column-hinge mixed mode, among which the beam-hinge mode is the most ideal failure mode, that is, the beam end yields...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04C3/20
Inventor 李振宝谢菲解咏平宋坤周宏宇
Owner 南通翰坤建筑材料有限公司
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