Study On Seismic Behavior Of Composite Steel Reinforced Concreteframework Structure

At present, the reinforced concrete structure has become a variety of building the structure of the most popular, and most of the reinforced concrete structure building design reference period is 50 years., however, there are a large part of the buildings used in the design reference period is affected by various unfavorable factors, such as natural disasters, material performance degradation, using utility change, improper design and construction, environmental erosion, etc. Its use function will also decline gradually along with the extension of use fixed number of year, it is also an irreversible objective laws of nature. Therefore, through the study of the reinforcement of concrete structure reinforcement to prolong its service life has become a new research hotspot in the field of construction projects around the world.This would work, at home and abroad to paste CFRP reinforcement and outsourcing Angle approach to the study on the reinforcement of reinforced concrete structure is relatively mature, but outsourcing Angle steel reinforcement and pasting CFRP strengthening two reinforcement of composite reinforced concrete structure in the form of study is very few and not mature and the mode of a single component taken to reinforce beam, column, mainly concentrated in reinforcement nodes on a single component, such as outsourcing Angle and pasting CFRP compound reinforcement of reinforced concrete frame structure as a whole the experimental study of rare, especially after damage of reinforced concrete frame structure is more rare. Because in practical engineering is often the need for the damage to the overall frame structure of the so this experiment adopts two kinds of Angle steel and CFRP reinforcement material of four common has damaged the reinforced concrete frame structure for composite reinforcement, carbon fiber cloth reinforcement, Angle steel, reinforcement, reinforcement reinforcement in the form of contrast, reoccupy MTS for repeated horizontal loading of low cycle aseismic test and research.Will be one of the common without reinforcement as a control component, the three common used, comparing the different ways to reinforce framework and its low reversed cyclic loading tests are carried out. Primary record in the process of four cross test specimen of load, displacement, crack development and corresponding with strain collection device of Angle steel and CFRP strain are collected. According to the analysis of test results contrast, draw the hysteretic curve and skeleton curve of the specimens, the three different reinforcement schemes of specimen impact on seismic ability of frame structure. The experimental results showed that:(1)composite reinforcement method can delay the degradation of stiffness and bearing capacity of frame, so as to improve its ability to repeatedly load resistance. Especially for the structure bearing capacity to reduce delay, composite reinforcement method than carbon fiber reinforcement method and Angle steel reinforcement method has greatly improved.(2)the hysteretic curve and skeleton curve of the specimens show that damaged after composite reinforced concrete frame is still has strong energy absorption capacity and good ductility.(3)composite reinforcement method can greatly improve the bearing capacity of structure, including the crack load and yield load, ultimate load, and the cracking load, yield load increase was significantly greater than carbon fiber reinforced frame and Angle steel reinforced frame. To a certain extent, steel and carbon fiber is a good way to work together.(4) under the repeated low cycle loads, after reinforcement of reinforced concrete frame has the strong ability of energy dissipation, relative to the BJGKJ framework, composite reinforcement framework FHKJ and carbon fiber reinforced frame TXWBKJ, JGKJ the seismic energy dissipation capacity of the structure are greatly improved.(5) two kinds of carbon fiber and Angle steel reinforcement material can increase the damage of frame structure crack load and yield load, increase the cracking load, Angle steel reinforcement increased by 91%, a 59% increase in carbon fiber reinforced plastics, Angle steel reinforced method of concrete crack limit role than carbon fiber; Increase the yield load:Angle steel reinforcement increased by 40%, a 7% increase in carbon fiber reinforced plastics, Angle steel reinforcement method increase the damage of concrete frame is bigger than the yield load of carbon fiber reinforced method.