Precast Prestressed Concrete Shear Wall Seismic Research

At present, most of the multilayer and high-rise residential buildings are cast-in-place concrete structure, with the rapid development of real estate industry and social economic in the past few years,Industrialized production of high degree construction building structure and the quality of the product and not in the process of construction that will waste a lot of raw materials, construction site conditions lead to low efficiency of the complex work impact on the environment in which the faults appears gradually, How to avoid the disadvantages and the realization of reinforced concrete shear wall structure of the industrialization development becomes an important research direction. This paper puts forward the precast prestressing shearwall structure system which use post-tensioned method to assemble the precast prestressing shearwall into whole wall structure,it can improve the anti-crack performance, integrity and stiffnessand make the structure have good recovery capability after earthquake,compared to cast-in-place shearwall,it have many technology and economic advantagesIn order to study the structure of the system in performance characteristics, the structure of the system to typical section of the wall limb, for example:one word of cross section shape of cross section shape and T word both limbs of cross section of the form of precast prestressed steel wall through the connection of the specimens of further research, based on this and with section form of cast-in-situ wall, compared to the analysis of their similarities and differences, and by using the program ABAQUS were used respectively to the simulation of the displacement control low cyclic loading and displacement monotonous increasing loading of the mode of analyzed compare the seismic performance performance, also on the basis of a door model design precast prestressed concrete shear wall structure model to study the earthquake in under the action of dynamic response, mainly from the following content on:(1)Through the pre-production of three different section of the precast prestressed concrete type shear wall from the test model based on the results of tests, using ABAQUS software testing model simulation specimens horizontal low cyclic loading test. The simulation results show that the failure of the main focus on wall and fixed the beam and wall and wall body taking located between the department of coupling beam, these parts of the structure is weak positions, and the test results are consistent.(2) Strength grade of concrete in C30-C45range and axial compression ratio in the range of0.1-0.5precast prestressed concrete shear wall model is drab level load to the whole process of elastic-plastic calculation. The calculation results show that, with the strength of concrete levels increase three different section type specimens of limit load, load increase displacement curve and the slope of the increase reflects the increase the stiffness of the specimen cracking load becomes larger, at the same time specimens loaddeflection curves back and the peaks of the ultimate load of slow growth rate, t-shaped section form of loaddeflection curves for the decline than other two cross section shape is obvious; Along with the increase of the axial compressive ratio of different section type of wall loaddeflection curves show first increases, then decreases the change trend, when the axial compression than in a certain range increases, the axial pressure reduces the concrete and steel reinforced the principal tensile stress, and postpone the occurrence of crack and crack width and the increase of the axial compressive ratio when too high, it will weaken the wall shear capacity. When the axial compression ratio is0.4basic achieve maximum capacity specimens, when the axial compression ratio0.5when the bearing capacity of the specimen has not increased and the downward trend, the biggest reason suggests control wall of the axial compressive ratio of0.4within limits.(3) Through the analysis and the simplified SAP2000software of a typical family of precast prestressed15layer shear wall structure model under the action of earthquake the dynamic response. The decomposition of the vibration model respectively by means of response spectrum method and schedule obtained in the analysis structure under the action of the maximal displacement and floor of displacements Angle. The calculation results show that in such structure layout and layer, the structure of the layers of the maximum displacement Angle does not exceed standard of shear wall structure between layers of the biggest displacement Angle limit regulations. Their choice of El, Taft, Lan4-2three kinds of seismic wave function, the structure of the floor the maximal displacement between layers, the maximum displacement Angle and basal shear difference, of which Taft wave in under the action of the structure of the dynamic response to the most obvious, close to the code for the shear wall structure, the biggest layer displacement Angle between1/120of the limit. Floor of displacements Angle increases with the largest number of the change trend of:first increases, then decreases, in the middle a floor to achieve the maximum displacement Angle between the layers. The structure of input earthquake waves, by looking at the change of displacement Angle between the layers structure of the lateral stiffness mutations found parts and mutation degree, this structure in the X to the seismic wave displacement between graphics is obviously "fingers" shape, in the fourth layer structure that the lateral stiffness have mutations, design should take specific measures.