Seismic Analysis Of Gymnasium Building Based On Moderate Earthquake Performance Design

Gymnasium building is the main place for schools,especially primary and secondary schools,to carry out sports and cultural activities.The first or second floor of the multi-story gymnasium may also be a student dining hall or sports classroom,and the top floor is usually an indoor blue stadium with a steel mesh roof.After the Wenchuan earthquake,the seismic fortification categories of primary and secondary school buildings,such as gymnasium,were divided into key fortification categories.In the event of the earthquake,the gymnasium building with large space may also take on the important mission of the temporary rescue command center.It can be seen from this that we have put forward higher seismic performance requirements for the mixed structure of gymnasium.In the rare earthquake,in addition to ensuring that it does not have serious harm,we can see that we have put forward higher seismic performance requirements for the mixed structure of gymnasium.In addition to the collapse of life safety,we should also ensure that it does not have serious damage to its use function,at least to ensure that it can be used as an important mission as a temporary rescue place after simple restoration.At present,the bearing capacity of structural members is calculated by the combination of small earthquakes and the adjustment coefficient of seismic action in gymnasium buildings in China,supplemented by various seismic technical measures and structural requirements.It is difficult to ensure and predict the seismic performance of structures under rare earthquakes.The large spatial structure of gymnasium building and the lack of row columns with Y-direction connecting beams make structural designers often meet the limit value of interstory displacement angle required by the code by increasing the section size of members in the design.This leads to the low axial compression ratio and reinforcement ratio of columns.Whether the design of moderate earthquake performance can enhance the seismic performance of gymnasium buildings by improving the reinforcement ratio of concrete Liang Zhu is worth going deep into.studyIn this paper,two gymnasium buildings with single layer attached frame and two gymnasium buildings with open active chamber at the top are selected.Through the performance design of medium earthquake and the conventional design of small earthquake,the elastic-plastic time history analysis is carried out by using the large-scale finite element software ABAQUS.The interstory displacement angle,base shear force,plastic development and component damage of gymnasium buildings under different design methods are compared.The main contents of this paper are as follows:(1)In this paper,the performance-based design method and the conventional method,the elastic design of small earthquakes,are briefly introduced,and the selection of seismic waves is also introduced.(2)For the gymnasium buildings,the conventional design of small earthquakes and the performance design of moderate earthquakes are adopted,and the three-dimensional structural model is established by using the finite element software ABAQUS,and the elastic-plastic dynamic time history analysis of rare,fortification and frequent earthquakes is carried out.(3)The dynamic elastic-plastic results of large earthquake,medium earthquake and small earthquake in gymnasium building model are analyzed.the results show that in rare earthquakes,fortification earthquakes,The maximum interstory displacement angle of the structure designed by different methods under the action of frequent earthquakes meets the requirements of the code,and the gymnasium model does not collapse under rare earthquakes.(4)The lack of Y-direction connecting beam in the row column of gymnasium leads to the large displacement angle between the Y direction of the row column.(5)The dynamic elastic-plastic analysis results of gymnasium structure designed by moderate earthquake performance design and small earthquake conventional design are compared.the gymnasium building designed by moderate earthquake elastic design has displacement angle,floor shear force and overturning bending moment between theunderstory of rare earthquake.The layer acceleration is better than the conventional design of small earthquakes.In this paper,it is considered that the limit value of interstory displacement angle of 1 ? 550 stipulated in the Code for Seismic Design of buildings for the performance design of mixed structures in gymnasium can be properly relaxed after in-depth study.In this paper,the plastic development and failure mode of gymnasium buildings are studied.The results show that the damage of the upper grid is lighter than that of the lower frame.