Research On Seismic Performance Of A High-Rise Prefabricated Isolated Structure

With the rapid progress of China’s urbanization process, urban residentialdemand for quantity and quality are increasing. In contrast with the current widelyused cast-in-situ concrete structure, modern prefabricated industrialized buildingpossess many significant advantages. Therefore, the large-scale application ofprefabricated industrial building has become an important feature of theindustrialization of modern residential construction. Seismic isolation technology isone of the most innovative means in the field of earthquake engineering and structuralengineering. It breaks through the traditional strategy of passive seismic designmethod, which is a more active philosophy of structure design. Application ofadvanced seismic isolation technology into the modern fabricated structure, not onlyto adapt to the growing requirements of the degree of commercialization of ourresidential, but also to meet the need to continuously improve the seismic safety ofthe owners of residential products, which represents one of the important developmentdirection of future residential construction, with an important "milestone" and a broadmarket prospect. Based on more than good industrial prospects, research on thehigh-rise isolation technology used in modern prefabricated industrial high-risebuilding is carried out. The main research contents in this thesis are listed as follows:Firstly, a high-rise fabricated isolation structure is designed according tofortification intensity of7, and the capacity of the isolation layer is estimated in therare earthquake. Considering the impact of the additional moment brought by themaximum horizontal displacement in the rare earthquake, the isolation layer isdesigned.Secondly, according to relevant research data for a large number of domestic andforeign prefabricated frame joints, two new high-rise fabricated isolation structureisolation layer prefabricated Joints are put forward. According to the typicalbeam-column joints of the foregoing actual isolation layer, a new fabricated joints anda cast-in-situ joints are designed and its low cyclic loading test is conducted.Comparing the results of failure modes, hysteretic behavior, ductiliy, energydissipation capacity, bearing capacity and stiffness degradation from the fabricatedjoints and cast-in-situ joints, the seismic performance of the fabricated joints isstudied, and a reference for engineering practice are presented. Thirdly, The superstructure and substructure of isolated high-rise building mayenter the state of plastic under severe earthquakes. Considering the particularity of thehigh-rise inter-story isolation building, and the non-linear performance of theisolation layer and its upper and lower parts, three-dimensional nonlinear fiberelement model is built using nonlinear analysis software Perform3D. Comparisonbetween isolated structure and non-isolated structure is presented according to thereasonable material constitutive model and calculation method. The results show thatthe superstructure and substructure of isolation layer is still in elastic state in the rarecase of earthquake. And acceleration response of the isolated structure is significantlyreduced, ensuring the comfort of personnel in the building and normal use function ofequipment.Finally, the damage failure mode of high-rise isolation structure were discussedunder mega earthquake through incremental dynamic analysis(PGA). Horizontaldeformation of the isolation layer, the tensile and compressive stress of the isolationbearing, the maximum inter-story drift and other limit IDA curve were analyzed. Theanalysis of the results shows that the maximum elastic-plastic inter-story drift occurin the isolation layer up one level. Damage first occurred in the isolation layer and theupper part (one or two story) frame beam components, and with the increase of thepeak ground acceleration (PGA), plastic deformation of the upper part of the structureup along the floor. The control factors of the failure mode of a isolated high-risefabricated structure in this thesis is the maximum inter-story drift.