The Research Of Vibration Reduction Mechanism On A New Type Joint-prefabricated Structure

At present,architectural industrialization is vigorously promoted to extend the application of fabricated structure under the policy of government.However,many problems exist in the technology and quality of fabricated structure.The design of fabricated structure is the same as cast-in-place structure.which leads to some difficulities in the construction of joints.It also affects the overall Anti-seismic ability of fabricated concrete strucutre.Thus,according to the current development of fabricated structure and the demand of application in the future,a new type of energy dissipation joint is proposed,which utilize lead laminated rubber to consume energy.The deformation ability of joints and the overall Anti-seismic level of fabricated structure is promoted through the influence of lead laminated rubber.The main contents and conclusions are as follows:(1)I-shaped steel joints with Lead laminated rubber is designed.Fine modeling is conducted in the ABAQUS.By comparison between the lead laminated rubber and ordinary I-shaped steel joints,the bearing capacity of two joints is nearly the same.The stress of lead laminated rubber joints near the location of I-shaped steel decreases to some extent.The addition of energy consumption joints slow the progression of collapse and rise of stress during the hardening range.When the displacement reaches its peak,the decreasing rate of joints stress significantly slows down under the effect of lead laminated rubber.The ductility is greatly improved,which shows good energy dissipation performance of Joints in late-stage.(2)Comparison of mechanical property between the lead laminated rubber joints and cast-in-place joints is conducted,the results show that the crack development of lead laminated rubber joints is relatively low.Reinforcement of beam yields late and the peak displacement is large.Under the effect of I-shaped steel joints with Lead laminated rubber,the decreasing rate of bearing capacity is delayed,which shows great ductility and late-stage energy dissipation capacity.(3)The Anti-seismic performance of cast-in-place frame structure and I-shaped steel joints with Lead laminated rubber frame structure is studied.Compared with cast-in-place frame structure,the crack development of first-story beam and column concrete is lower with the same horizontal displacement.The yield time of rebar near the first-story joints is late.The simulation results also indicate that I-shaped steel joints with Lead laminated rubber delay the decreasing rate of bearing capacity of frame structure.The overall ductility of frame structure is promoted.Good late-stage energy dissipation capacity is presented.By comparison of different length of beams,the crush degree of concrete near the intersection of I-shaped is lower when the distance between the joints and the edge of beam is farther.The rebar in the edge of beam will yield sooner.