| Compared with developed countries such as Europe,America and Japan,China’s high-rise building assembly rate is relatively low.One of the important reasons is that there is a lack of high-rise structural systems suitable for prefabricated assembly construction and relevant theories such as seismic and wind resistance cannot keep up with the development demand.In addition to the assembly structure system introduced from abroad,domestic lack of independent innovation suitable for the assembly of the construction of high-rise structural system.,Therefore,how to develop innovative and new high-rise structural systems suitable for assembling or semi-assembling construction on the basis of existing structural systems will help improve the level of China’s building industrialization and play a very important role in promoting the development of high-rise building industry.To this end,a new type of prefabricated double-steel concrete composite shear wall is proposed.The new kind assembled shear wall adopts a combination of “partial assembly and partial cast-in-place”,which can not only ensure the assembly integrity of prefabricated concrete shear wall,but also has simple and convenient assembly applicability and high bearing capacity.6 slices of the two-story prefabricated double-tube high-strength concrete shearing walls with single-span scale ratio of 1:3 and shear span ratio of 1.53 were designed and subjected to a pseudo-static test to study the seismic performance of such prefabricated shear walls.The main parameters of the test include axial compression ratio,steel tube area ratio and out-of-plane eccentricity and vertical steel pipe connection method.The seismic performance reference indicators include hysteretic behavior,stiffness,deformation capacity and energy consumption.The test results show that all the six specimens represent a bending shear composite failure and resulting in more cracks with wider distribution.Before the specimen reaches the yield displacement,the cracks are mainly concentrated in the lower section of the wall,and most of them are horizontal bending cracks;Since the specimen reached the yield displacement,with the increase of displacement and load,more curved shear cracks appear in the upper section of the wall.All the six specimens have high initial stiffness and bearing capacity,slow stiffness degradation,full hysteresis loop,good ductility and energy dissipation;reliable vertical connection,slower stiffness degradation,good ductilityand energy dissipation performance,the components are still in good seismic performance even under the conditions of high axial compression ratio and large off-plane loading.There is no shear failure and slippage at the joint layer of the bottom layer and the joint between the upper and lower walls,which means it’s completely equivalent to the integrity of the walls cast-in-place.Based on the experimental research,the mechanical model of this kind of shear wall was established with the nonlinear finite element software ABAQUS,by reasonably simplifying the boundary,contact conditions and joints.The numerical simulation of horizontal monotonic displacement loading was carried out to compare with the test results.The test and simulation prove that the new kind assembled shear wall has good seismic performance and can solve the problem of joint connection of prefabricated concrete-filled shear walls better,which can be applied to high-rise and super high-rise buildings. |
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