Effect Of Precast Concrete Infilled Wall On Seismic Performance Of Frame Structure

With the development of fabricated structures,great changes have taken place in the construction modes.The infilled wall is improtant in construction;masonry infilled wall is no longer suitable for prefabricated structures.Against this background,the concrete infilled wall,as a suitable infilled wall for fabricated structures,is used in constructions.Previous studies show that infilled walls have a considerable impact on the performance of frame structure.Although a large number of scholars made a lot of researches of the infilled frame structure,previous studies mostly focused on the masonry infilled frame structure or that of masonry infilled steel frame.That is to say,few of them focused on the concrete infilled walls,and analysis of influence factors in this frame structure is relatively insufficient.Contents of this paper are as follows.(1)summarizing the current domestic on the interface shear strength and the influence of infilled walls on the structure,this paper obtaines the interface connecting bar shear bearing capacity calculating method and equivalent strut model of infilled wall.In this paper,the equivalent contact surface theory is used to simulate the shear capacity between concrete infilled walls and frames.It can make up for the shortcomings of the direct establishment of the steel model,taking the shear capacity of the reinforcing bars into consideration.(2)Compared with traditional masonry infilled walls,concrete infilled walls are with greater rigidity,better integrity and stronger bearing capacity.Based on previous studies,,this paper analyzes the impacts of 4 factors on the performance through finite element software ATENA.(3)Due to the complexity of finite element analysis of infilled walls,its popularization at wide range in practical engineering is comparatively difficult.Therefore,many simplified models,aimed at the calculation of infilled walls,are put forward.Integrating with results of finite element analysis,this paper verifies the rationality of existing equivalent models of infilled walls to concrete infilled walls,and makes necessary adjustment,thus providing the basis for practical engineering to consider impacts of concrete infilled walls on the performance of frame structure.(4)This paper introduces the theory of Pushover analysis and the process of using SAP2000 to achieve Pushover analysis.Through engineering projects,this paper introduces details in prefabricated frame structure,such as composite plates,composite beams,frame columns and tying nodes in concrete infilled walls,and makes Pushover analysis of practical engineering modeling.By the comparison of top displacement-base shear,performance point and inter-story displacement angle in the modeling,this paper studies on impacts of concrete infilled walls on bearing capacity,deformability and rigidity of frame structure.(5)Estimating horizontal seismic load by means of equivalent base shear method,this paper probes into the impacts of different infilled walls on structural natural period,and calculates the impacts of the former on structural horizontal seismic load.Besides,via collecting the rules of infilled walls on structural performance in standards of various countries,combining modal analysis of practical engineering,this paper evaluates taking value methods of vibration period in concrete infilled walls-frame structure and gives suggestions for standards in China.