Performance Evaluation Of Dry Connection Precast Concrete Structure Considering Cumulative Damage

Currently the central and local governments have repeatedly issued policies and relevant documents to promote the development of construction industrialization.Chinese construction industry has turned into green,industrialized and informational development.The dry connection precast frame has no wet operation on site,and the components are prefabricated to a high degree.The construction is green and efficient,so as to realize rapid maintenance after earthquake with energy consumption device,which is more in line with the requirements of architectural industrial development.Accurate and comprehensive evaluation of structural performance is based on performance-based seismic design,this paper evaluates the joint and frame levels in an all-round and multi-dimensional way according to the performance of prestressed and energy-dissipated prefabricated frames,which lays a foundation for the performance-based seismic design theoretical development in dry connection precast frames.In this paper,the prestressed reinforcement-energy dissipation prefabricated beam-column joint is analyzed theoretically,and the mechanical characteristics and stress mechanism of the joint are illustrated.Based on Open Sees platform,a general numerical simulation model of prestressed reinforcement-energy dissipation prefabricated beam column joint is proposed,and the typical tests designed for three different energy dissipation devices,such as energy dissipation angle steel,energy dissipation rod and damper,are used to verify the general model.The general model is used to analyze the key parameters related to the self-reset and energy dissipation ability.And the mechanical characteristics of the prestressed reinforcement-energy dissipation prefabricated beam-column joint are further studied.Moreover,the performance of the dry connection precast joint is comprehensively evaluated from the joint level.A simplified model of prestressed reinforcement-energy dissipation prefabricated beam column joints with friction dampers as energy dissipation devices is proposed,and the accuracy of the model is verified.The numerical simulation is carried out at the frame level,and the results show that the simplified model greatly improves the convergence and computational efficiency of the numerical simulation.Based on OPENSEES platform,the numerical models of multi-storey cast-in-place frame and prestressed reinforcement-energy dissipation prefabricated frame were established.Seven suitable ground motions were selected based on the target response spectrum method,and the elastic-plastic time history analysis of the four numerical models was carried out.Vertex displacement,maximum interlayer drift and residual drift were selected as evaluation indexes,the seismic performance of multi-storey cast-in-place frame,high-rise cast-in-place frame,multi-storey fabricated frame and high-rise fabricated frame under frequent earthquake,fortification earthquake and rare earthquake was studied,and the performance of dry connection precast frame is evaluated from multi-dimensional frame level.The basic principles and methods of incremental dynamic analysis and vulnerability analysis were discussed,and the incremental dynamic analysis and vulnerability analysis were carried out for the numerical models of multi-storey cast-in-place frame and prestressed reinforcement-energy dissipation prefabricated frame.The peak acceleration PGA and the basic periodic spectrum acceleration S a（7）T ₁（8）were picked as Intensity Measure,and the maximum inter story displacement angle and residual displacement angle were taken as the Damage Measure.The seismic performance of the dry connection precast frame under different ground motion strength and the probability of exceeding a certain limit state under a specific ground motion strength were evaluated.Earthquake action often appears in the form of earthquake clusters,and the aftershocks that cannot be ignored are often followed by the main earthquake.It is of great significance to study the performance of structures under cumulative damage.This paper selected 10 mainshocks and aftershocks with maximum accelerations of the same earthquake at the same station from the PEER platform,spliced them together and inserted a certain time interval to form the main＆aftershock ground motions.The main＆aftershock ground motions were applied to cast-in-place frame to simulate the cumulative damage;the aftershock ground motions were also applied to prestressed reinforcement-energy dissipation fabricated frame to analyse the state of quick repair after earthquake and replacement of energy dissipation devices.Through IDA analysis and vulnerability analysis,the performance of the fabricated frame after rapid repair was evaluated.