Analysis And Verification On Seismic Performance Of Masonry Building With Concrete Frame-Shear Wall Structure On First Two Stories

Masonry building with concrete frame-shear wall structure on ground stories costs relatively low, easy to construct, therefore this style of buildings is prevalent in small and middle cities. However,"upper's weight is heavier than bottom, and upper's stiffness is stronger than bottom"is one of the characters of this structure system, belonging to vertical irregular structures. So nowadays, this kind of structures is studied by many academics, but relatively few researches are about the masonry building with concrete frame-shear wall structure on first two stories which generally applied to the low intensity area that can satisfy the requirement of large space at the bottom, and the researches mainly by means of experiments, which is confined to specific actual engineering, and costs time together with labor and factors that considered in an experiment are limited. While theoretical research based on story model, can only reflect the macroscopical performance of structure.Therefore, it is necessary to conduct digital simulation analysis, making consider more factors possible at the same time. This paper uses ABAQUS finite element analysis software to build a three-dimensional model and to carry on dynamic elastic-plastic time history analysis and static elastic-plastic Pushover analysis in order to analyze the seismic performance of Masonry building with concrete frame-shear wall structure on first two stories. Analyze effects on seismic performance of the structures under the conditions of different lateral stiffness ratios between the 2nd floor and the 3rd floor, different bottom-frame spans with the same story stiffness ratio and different details in transition-stories.According to the analysis, the paper comes to conclusions below:①The results of this sample conform with similar experiments', suggesting that this method is applicable and efficient to analyze nonlinear response of masonry building with concrete frame-shear wall structure on first two stories.②Masonry building with concrete frame-shear wall structure on first two stories designed according to the code for seismic design of buildings has considerable seismic resistance, which can satisfy"undamaged under minor earthquake,repairable under moderate earthquake,collapse prevention under severe earthquake"three-standard requirements in seismic zone of intensity 7.③As the story stiffness ratio becomes smaller; the structure's weak story moves from the bottom frame to upper masonry story. When the story stiffness ratio is 1.5, the model appears better seismic capacity, which is bottom has good energy dissipation capacity. Under the consequence, upper masonry story deformation unapt too large.It is recommended that the story stiffness ratio should be controlled at 1.5 or so in seismic zone of intensity 7.④Larger bottom-frame span with the same story stiffness ratio appears bigger general displacement under seismic action. Strengthening the details of transition story according the new code can efficiently improve damaged situations of its walls but increase the deformation of bottom- frame at the same time, which, however, satisfy the code requirement.⑤There is no big difference between the results of Pushover analysis and time-history analysis. The static elastic-plastic Pushover analysis method based on ABAQUS used as a simple nonlinear method to analyze the weak links and deformation capacity of masonry building with concrete frame-shear wall structure on first two stories is meaningful in engineering appliance.