Computerized Integration Of Isolation And Energy Dissipation Elements And Research On Their Applications In Performance-based Seismic Design Of Prefabricated Concrete Shear Wall Structures

The prefabricated concrete shear wall(PCSW)structure is an important part of prefabricated structure,which has advantages of high efficiency in construction,energy saving and environmentally friendly,good anti-seismic performance,and flexible structural arrangement.But compared to cast-in-situ shear walls,prefabricated one has worse integrity and costs much.This limits its application in high-rise structures and high anti-seismic fortification intensity areas.Damping and isolation technology is an effective method to improve structural anti-seismic performance and reduce the cost of structural engineering.The combination of prefabricated shear wall with damping and isolation technology can reduce the energy consumption of the original structure and improve the anti-seismic performance of the prefabricated shear wall structure,which is the development trend of PCSW structure.Based on the current research status of PCSW structures and seismic isolation technology,and considering the requirements of the research group’s selfdeveloped program,this work provides seismic absorption technical support to complete selfdeveloped program,and then aiming at the combination of prefabricated shear wall with damping and isolation technology,proposes the design method which can be applied to PCSW isolation structure and energy-dissipating structure.Based on the analysis of the above conditions,this work has finished the following content.(1)The integration and verification of the damping and isolation device in DUT 2014,a self-developed finite element program platform,is carried out.The zero-length element,the improved Bouc-Wen model(BWBN material model)and the Maxwell model are integrated into the self-developed finite element program platform-DUT 2014.At the same time,3D frame model is built in DUT 2014 and OpenSees to verify the accuracy and reliability of zero-length element,BWBN model and Maxwell model.The comparison analysis with OpenSees shows that the integrated element and materials have excellent accuracy,which improves the simulation of the damping and isolation devices and provides technical support for the subsequent work.(2)The seismic design method of prefabricated concrete shear wall isolation structure with semi-rigid horizontal joints is proposed.In view of the horizontal joint dry connection of prefabricated concrete shear wall structures in China and abroad,the evaluation index system of horizontal joint dry connection is proposed,and the qualitative evaluation is carried out to select a connection which is widely used.Then,considering the semi-rigidity of the connection,the equivalent bending stiffness of the shear wall structure is determined,and combined with the seismic isolation technology,the two-mass points direct analysis method is used to perform the elastic design of the prefabricated concrete shear wall isolation structure.Finally,appropriate restoring force models are selected to analyze the seismic performance of the structure under the multi-level earthquakes.The comparative analysis of the two-mass points direct analysis method and the finite element model shows that the prefabricated concrete shear wall isolation structure designed by this method has high accuracy,which can be used in the preliminary design of the structure and provides the basic information of structural model for subsequent time history analysis.Seismic performance analysis of the structure under multi-level earthquakes shows that the designed prefabricated concrete shear wall isolation structure meets the proposed performance goals of story drifts and deformation of the isolation bearing,and ensures the rationality and economy of the structure design.(3)The seismic design method of the prefabricated concrete shear wall energy dissipation structure with energy dissipation coupling beam is proposed.The existing widely-used semirigid connection of beam to wall is selected and the rotational stiffness of the connection is determined.Then the energy-dissipating beams is combined with PCSW structures to form a PCSW structure with energy-dissipating beams.Aiming at reducing the seismic structure requirement of the main structure by half degree,the PCSW structure with energy-dissipating beams is designed for frequent earthquakes.Then,the relevant parameters of the energy dissipation connecting beam and semi-rigid joint constructions are determined.Finally the appropriate restorative force models are selected to verify the structure under the rare earthquakes.The structural design shows that the "reverse design" method of half-degree reduction can accurately calculate the design parameters of the energy-dissipation damping devices,effectively and reasonably determine the size of the structural components,and make the structural design more economical and reasonable.