The Effect Of Setting Inclined Brace On Reinforced Concrete Rfame Cruciform Jointsby

With the rapid development of national economy, the concrete structure is widelyused in many fields, such as industrial&civil buildimg, factories and bridges,especially on high-rise buildings, because of its good mechanical properties, economicperformance and service performance. The twelfth five-year project was carried out inthis year, that the reinforced concrete was promoted and developed has long-standingand actual meaning under the demand of developing low-carbon economy and greeneconomy globally, reinforced concrete industry plays a important role in propelling thecontinuous and stable increase of the whole national economy.In the earthquake, it can be seen that many destructions of concrete structurebuildings resulted from the failure destruction of beam-column nodes, so the structuralanti-seismic weak link of the reinforced concrete is the beam-column joints. Interrelateddesign standard at domestic is not perfect in controlling beam-column connections atpresent, Code for design of concrete structures and Technical specification for concretestructures of tall building just put out detailed provisions and constructive demands forthe fixtures in beam-column connections, and the measure for firming connections isjust confided to the connection of fixture, not involved the inclined brace’s application.In order to reduce the losses coming from connections brittle fracture, develop bearingcapacity in connection area, and improve the working property of beam-columnconnections, suppose to set up the batter brace in connection’s area and do somenumerical simulation and analysis, accordingly to provide theoretical basis and digitalevidence for further completing the interrelated design standards and strengthening itsfeasibility in project.Aimed at cruciform beam-column joints of disabled reinforced concrete framestructure in earthquake, this paper used the concrete structure design principle astheoretical foundation, and applied the concrete constitutive relation computation modelof uniaxial compression and the doubly straight line computation model of rebarcomplete elastoplasticity, and used the concrete damage plasticity as the researchpremise, and used large finite element software ABAQUS6.9.1, and selected concreteC30, rebar HRB335and stirrup HPB235, and adopted different section forms and sizebeam-column connection nodes and the inclined brace, and utilized embeddedtechnique to simulate the bonding of rebar and con crete, and modeled two typescruciform beam-column joints, and comparatively analyzed the mechanical properties of nodes which are pre and post set inclined brace. The results indicate that the nodesbearing capacity used inclined brace strengthening is stronger than that unused inclinedbrace. The nodes used inclined brace are three times as strong as that unused inclinedbrace under the same load. After appearance of bearing capacity limitation, the failureof cruciform beam-column joints starts inclined brace, and will take place the failure inbeam-column connection regions.