Experimental Study On Seismic Performance Of Strengthened Damaged RC Bridge Piers

The main characteristic of seismic damage of reinforced concrete bridge pier damage injury lead to serious damage or even collapse, cause huge economic losses and casualties, at the same time, rebuild or repair the bridge and bridge traffic will lead to a period of time, have a significant impact on earthquake relief work. So the damage of reinforced concrete bridge piers quick fix to quickly restore the traffic network, ensure the timely in earthquake relief work, and save the post-disaster reconstruction funds has the vital significance.For reinforced concrete bridge piers repair reinforcement technology research at home and abroad a lot more, but the study is more of a reinforcement technology are studied, and the lack of some for multiple repair reinforcement technology of the comparison of the effect of construction process and repair. Respectively in this paper, three kinds of fast repair technology, including for reinforcing steel tube reinforcement constraint repair technology, basalt fiber reinforced composite material (BFRP) cloth repair technology, and carbon fiber reinforced composite materials (CFRP) cloth technology to repair wound reinforcement, repair of reinforced concrete bridge pier seismic performance tests have been carried out respectively, and combining the reinforcement effect and economic and applicable aspects doing something to make a comparative analysis.In order to explore various reinforced concrete bridge piers repair reinforcement technology in the restoration of damaged after the earthquake and other cases reinforcement effect, this paper designed the three reinforced concrete model bridge pier, through the pseudo static test on the pier simulation seismic damage; With three different repair reinforcement technology of rapid repair reinforcement, through pseudo static test after repair specimens under low reversed cyclic loading is of hysteresis properties, bearing capacity, deformation capacity, energy dissipation capacity and failure mode. Three kinds of the repaired specimens reinforced specimen of the hysteresis curve more full than the original specimen, the seismic energy dissipation capacity are improved to varying degrees, the steel tube reinforcement technology of horizontal bearing capacity of the specimens increased by33.8%, while using BFRP and CFRP reinforcement technology of the horizontal bearing capacity of the specimens basically remain unchanged;Due to the effect of lateral restraint of the steel tube reinforcement technology and fiber cloth, put three to compression on reinforced concrete and reinforced concrete is to maintain integrity, avoiding longitudinal reinforcement buckling, the old and new concrete in tension and longitudinal bar in front of the loss of lateral restraint can give full play to their respective material performance, and so on under the condition of large lateral rate can still maintain a lateral force basically stable, showing good ductility, steel tube strengthening technology improve the biggest, BFRP reinforcement technology improve the minimum.Combining the actual situation at home and abroad, comparing three repair reinforcement technology complexity of construction technology, durability and economy, etc. This experiment text adopts steel Steel tube reinforcement technology has been used in Yingxiu town in Sichuan province local man builds house at ruins at Yuzixi1bridge repair reinforcement project after the quake. Further research, through experiment and practice summary, for the future of reinforced concrete bridge piers fast repair reinforcement design and construction of the selection and use of technology to provide some theoretical basis and experimental data and practical experience.