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Experimental Study on Shear Behavior and Behavior at Elevated Temperature of RC Beams Strengthened with High-performance Ferrocement

Author: YanJun
Tutor: ShangShouPing
School: Hunan University
Course: Structural Engineering
Keywords: Reinforcement Peel off Shear High temperature
CLC: TU746.3
Type: Master's thesis
Year: 2007
Downloads: 80
Quote: 6
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Abstract


The existing building structures due to the influence of various factors can not meet the requirements of security bearer or normal use , the need for repair and reinforcement . High-performance composite mortar reinforced steel mesh ( HPF) method as a new reinforcement method has many superior characteristics , increasingly favored by the engineering community . High - performance composite ferrocement strengthened RC beam commonly used on three sides of the U-shaped reinforcement , this reinforcement is prone reinforcement layer peeling , so that the reinforcement layer failure , the bearing capacity is greatly reduced , resulting in the risk of brittle failure . High performance composite mortar steel mesh reinforcement inorganic materials relative to stick steel reinforcement method using organic glue , paste carbon fiber material reinforcement method has excellent high temperature performance . However , the reinforcement method the reinforcement thickness is generally small , its fire resistance , high temperature performance is necessary to conduct an in-depth study . In response to these problems , we designed the five high-performance composite mortar steel mesh reinforcement beams and a comparison beam at room temperature under shear peel performance test . The girder on three sides of the U-shaped reinforcement , debonding form of reinforcement layer peeling mechanism , stripping reinforcement of RC Beams reinforcement . Truss - arch model to consider stripping influence coefficient k shear capacity formula is derived with the test results , use certain reference value of the actual project . Also designed five three-sided U- reinforced beams and a comparison beam the dead load temperature conditions of high temperature performance test , the high temperature of the simulated fire reinforcement beam performance , study of the morphology of the destruction of the specimens , destruction extreme temperatures, and approximate to the time when the destruction as fire resistance , quantitative study of the fire resistance of reinforced beams HPF reinforcement layer structure proposed to consider the fire safety requirements . This paper tests found that the quality of construction is a crucial factor to influence reinforcement effect and refractory properties This article attempts stripped influence coefficient k value , in accordance with the level of construction quality and analysis of the interfacial bonding properties of fire resistance , considered reinforcement of the fire resistance of the specimen interface construction technology requirements.

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CLC: > Industrial Technology > Building Science > Construction > Construction Technology > Building maintenance,repair,demolition > Maintenance, alteration,renovation of the buildings
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