Research On Seismic Performance Of Precast RC Shear Wall And Limited Length Of Overlap-joint Restraint Grouting-anchoring

Precast concrete structure have construction advantages with standard、precise、energy-saving、efficient building design. Under the external environment in the countryvigorously promote energy conservation, the precast concrete structure are appropriatein extensive use in urban. The core technology of precast concrete structure is aprefabricated site connections, prefabricated connection reliability is the key technology.Harbin Institute of Technology through research and exploration, independent researchand development constraints Restraint grouting-anchoring overlap-joint of steel bar tosolve the connection of precast concrete structures, and which reinforced lap connectionfor precast concrete shear wall system, achieved good results in the actual project. since2008, the lap length of reinforcement and structural measures in-depth experimental andtheoretical studies, give full consideration to the impact of the spiral stirrups thisconstraint measures reinforced lap joint connection, lap steel bars the length of steel baranchorage length of1.0time. The proposed design method safer theoretical calculationsand the corresponding structural requirements.This article is a preliminary study on the basis of its conclusions and applied to8-zone edge by the full scale of the force vertical ribs of large diameter high-levelprecast concrete shear wall structure prefabricated shear wall specimens takenreinforced overlap length is reinforcement anchorage length of1.0times. Productingthree precast concrete shear wall specimens with edge constraint the diameter of thelongitudinal bars12mm,16mm and20mm. Producting three cast-in-place shear wallspecimens, the diameter of the edge constraint of longitudinal reinforcement andprefabricated shear walls correspond to the specimen, specimen size, steel barreinforcement are the same. Seismic performance under low cyclic loading by six shearwall specimens obtained constraints restraint grouting-anchoring precast shear wallspecimens and their corresponding situ shear wall specimen degradation stiffness, loadcapacity, ductility and energy dissipation capacity, and other indicators, and compare.bearing capacity of the precast concrete shear walls with cast-in-place concrete shearwalls, the improvement of the small amplitude. Precast concrete shear walls of thecompression zone spiral stirrups constraints, internal did not happen destruction, in-situconcrete shear wall compression zone of concrete is completely crushing.On an established experimental basis, reinforced overlap length and the mechanicalmodel and the relationship between spiral stirrup to stirrup ratio has been simplified,easier to use in the construction of the housing industry. The same time, the reinforcedlap joint connection detail finite element simulation, compared to the original analysisof test results and simulation results coincide basically good, and reinforced the laplength and anchorage length ratio of less than1.0, the connection is still reliable, with the theoretical calculation and finite element simulation, the minimum overlap length ofthe theory of reinforced, to provide theoretical support for the latter part of the test thenext step to reduce the reinforced overlap length. Improve the setting of the biascalculation of shear wall and concrete shear wall parameter specification, by experimentand FEM simulation experiment shows that the constraints pulp anchor reinforced lapconnectivity is reliable, can be applied to the region of the housing industrydevelopment and application.