Research On Seismic Performance Of Prefabricated Concrete Frame Structure With Energy Dissipation Cladding Panel

With the development of building industrialization and prefabricated buildings in China,precast concrete sandwich panels(PCSPs),as a high-performance enclosure component,have been widely used.A line connection,in which the PCSP and top beam are connected along the beam length direction using reinforcing bars,is generally adopted in China with emphasis on avoiding the plastic regions at the beam ends.In addition,the PCSP and bottom beam are connected using angle steels.Using such connection,the PCSP needs to exhibit sliding deformation to accommodate structural deformation under the earthquake load,which can be realized using long bolt holes on the bolt connection.To utilize the relative deformation to improve the seismic performance of the structure in this paper,a novel connection,in which U-shaped steel dampers are adopted to connect the PCSP and structure at the bottom instead of angle steels,is proposed.U-shaped steel plate damper can dissipate energy when relative sliding deformation occurs between the PCSP and main structure,so as to reduce seismic response and damage state of structure.In this paper,the damping system composed of U-shaped steel plate damper and PCSP is named ‘Energy Dissipation Cladding Panel(EDCP)’.To fully investigate the seismic response,damage characteristics of prefabricated concrete frame structures with EDCP and the collaborative mechanism of vibration reduction of EDCP and the main structure,the main work of this paper are as follows:(1)The previous pseudo static tests of the prefabricated concrete wall-frame structure with EDCP and the U-shaped steel plate dampers are briefly introduced,which were conducted by the research team.Based on the experimental data,the modeling methods of the fine and two simplified finite element models using the MSC.Marc software are proposed.Different scales finite element models can be applied to the numerical simulation of component and structure levels,respectively.The rationality and reliability of the modeling methods are validated by comparing the predicted results and experimental results.(2)An 8-story fabricated concrete frame structure with EDCP was designed,and the number and setup scheme of U-shaped steel plate dampers in the structure are determined.Dynamic and time-historical analysis of the structures with and without EDCPs are conducted using the validated simplified finite element modeling method,in which 5 natural and 2 artificial ground motions were selected and generated as the seismic input to the structures.The collaborative damping effect and seismic damage characteristics of such structure are clarified by comparing the seismic response of the structures with and without EDCP.An elastoplastic dynamic analysis of the shock-absorbing structure and the structure without EDCP was carried out by using a simplified finite element modeling method after verification,selecting 5 natural ground motion records and 2 artificial waves.(3)Parametric analysis is performed for the critical design parameters of the fabricated concrete frame structure with EDCP Perform parameter analysis on the overall structure according to the key design parameters of the assembled concrete frame structure with EDCP.The change law of the structural damping performance and mechanism under different stiffness ratios,yield force ratios and cladding panel hole size is counted.The influence of the opening size of the cladding panel on the seismic performance of the structure is analyzed.Meanwhile,the influence of different damper setup schemes on the damping effect is studied,and thus clarifies the optimal setup schemes of the U-shaped steel plate damper.