Mechanical Performance Under Cyclic Test Of Mongolia Yurts Of Cold-formed Thin-walled Steel

Mongolian yurt is a building structure with ethnic characteristics,it’s also a totem and symbol of grassland culture.The tourism industry in the grassland region is developing rapidly,and it is increasingly demanding a new type of grassland building structure with large span and large space.The traditional yurt structure has not met the requirements of current development due to various constraints.Taking into account the current national policy orientation of green development and the performance advantages of cold-formed thin-walled steel in low-rise building construction,the cold-formed thin-walled double-limb C steel inserting plate is used on the basis of unchanging the shape characteristics and function of the grassland building and the function of the house.In the form of a section,the component is a new type of grassland building spatial structure.The main research contents of this paper are as follows:According to the laboratory conditions,a reasonable structural section size is designed for the cold-formed thin-walled steel new yurt structural system.The test object is a cold-formed thin-walled yurt structural specimen with slopes of 10°and 30°.The specimens were subjected to a horizontal single-point low-cycle reciprocating load,and the force behavior and test data of the specimen under load were observed and analyzed.The results show that the joints of the structure are reliable.Seismic code requirements;the ductility coefficients of specimens with slopes of 10° and 30° are 8.35 and 6.82,respectively,the bearing capacity degradation coefficients are maintained above 0.97,and the energy dissipation coefficients are between 1.22~1.52 and 0.8 ~ 1.16,respectively.The hysteresis coefficient is between 0.19~0.24 and 0.13~0.18.It shows that the displacement and deformation ability of this structural system is more prominent,the bearing capacity is degraded stably,and it has high bearing capacity and seismic resistance.Compared with the test specimen with a slope of 10 °,the bearing capacity of the test specimen at 30 ° is slightly improved,but the initial stiffness,ductility,energy consumption capacity,plastic deformation capacity,and overall structural stability are reduced to varying degrees.Through the study of the damage mechanism of the structural system,it was found that the cold-formed steel yurt structure meets the seismic fortification requirements of “strong columns,weak beams,strong nodes,and weak members”,and the key nodes have reliable transmission force,which is an ideal new grassland area building structural form.In ANSYS finite element dynamic analysis,it is found by modal analysis that the disadvantageous location of the cold-formed steel yurt is located at the wall beam,beam and ring beam.The dynamic time-history analysis of the yurt structure with different slopes was carried out under the action of different seismic waves,and the displacement and acceleration values of the column top of the yurt structure were compared and analyzed.The value is about 10% greater than the 10 ° yurt,but in the Z direction,the average column displacement and acceleration of the 30 ° specimen are smaller than the 10 ° specimen.It is obtained that as the slope increases,the rigidity of the structure in the X / Y direction will be reduced,but the stability of the structure in the Z direction will be strengthened.In this paper,the mechanical properties of a new type of yurt structure of cold-formed thin-walled steel are comprehensively analyzed through experiments and finite element methods.The research results can provide a certain reference for the application of housing structural engineering and the development of cold-formed steel in grassland areas.