Study On The Seismic Performance Of Corrugated Pipe Through-hole Grouted Shear Wall And Its Use In Elevator Retrofitting

In order to reduce the difficulty of assembling precast shear walls as well as to reduce the construction cost,this paper proposes a precast shear wall assembled by using corrugated pipe through-hole reinforcement grouting connection technology.The shear wall consists of two parts: precast and cast-in-place,where the precast part is made of metal pipes,rectangular hoop reinforcement and ordinary concrete casting;after transporting the precast part to the construction site,the longitudinal reinforcement in the shear wall is inserted into the pipes in the proposed assembled shear wall and injected with grout,and the complete shear wall is formed after maintenance and setting.Compared with the traditional sleeve grouting connection,the connection technology proposed in this paper belongs to the direct connection of reinforcement,the longitudinal reinforcement can be directly transferred,and the construction tolerance is large,as well as the number of connections between the longitudinal reinforcement in the prefabricated shear wall structure can be reduced,thus reducing the difficulty and cost of assembly construction,which has good prospects for engineering applications.Therefore,one cast-in-place concrete shear wall with two corrugated pipe through-hole grouted shear walls is designed in this paper,and the main research contents and conclusions are as follows:(1)The seismic performance indexes such as bearing capacity,hysteresis performance,ductility coefficient,stiffness degradation tendency and energy dissipation capacity were summarized and compared through low circumferential reciprocal load tests on cast-in-place concrete shear walls and corrugated through-hole grouted shear walls.The test results show that the ductility coefficient,energy dissipation capacity and initial stiffness of corrugated through-hole grouted shear walls are better than those of cast-in-place concrete shear walls,and their damage modes and bearing capacities are basically equivalent to those of cast-in-place concrete shear walls.The direct connection of corrugated pipe through-hole reinforcement grouting can better transfer the stress between reinforcement and reduce the number of reinforcement connections,and more importantly that the specimens with truncated reinforcement inside the pipes in the middle section of the corrugated pipe through-hole grouting shear wall body still have out good seismic performance.(2)Based on ABAQUS platform,a finite element model of corrugated pipe through-hole grouted shear wall was established and simulated for low circumferential reciprocal loading test.The results show that the hysteresis curve and skeleton curve of the model are in good agreement with the test results,and on this basis,the parameters of the diameter of the reinforcement in the pipes,the axial pressure ratio,the inner diameter of the pipes and the wall thickness of the pipes are expanded.The increase of the corrugated tube wall thickness has a small increase of the bearing capacity of the overall specimen and the lateral deformation capacity is reduced.With the increase of axial pressure ratio,the horizontal bearing capacity of corrugated pipe through-hole grouted shear wall series wall increases,but the lateral deformation is limited.(3)The corrugated tube through-hole grouted shear walls were applied to an elevator addition project in a unit building in Pudong New Area,Shanghai.The overall performance calculation analysis of the elevator shaft,the seismic performance test study of the partially prefabricated whole and the safety index of the corrugated pipe through-hole grouted shear wall in the structural application of the retrofitted elevator were carried out.In addition,the structural selection,assembly,transportation and production construction of the retrofitted elevator shaft were deepened,and the optimization scheme of the corrugated tube through-hole grouted shear wall in the application of the retrofitted elevator project was proposed.