| The large-span space structures have attracted the attention of architects of many countries because of its beautiful shape and good performance.Although the large-span space structures started late in China,it has developed rapidly.At present,there are still a large number of large-span space structures under construction.Such structures are usually of low self-weight and less damping,They are sensitive to dynamic loads(strong winds and earthquakes).Vibrations will appear more obviously under the action of dynamic loads,which will adversely affect the normal use of buildings.China is a country where earthquakes and typhoons are common,so earthquake and wind resistance research is very important for the safety design of large-span space structures.Studies have shown that structural vibration control devices can effectively reduce the seismic response of structures and reduce structural damage.Among them,applying Bulking Restrained Brace(BRB)to buildings provides a new method for vibration control of large-span space structures.As a kind of anti-lateral force member.Compared with the traditional brace,the core element of buckling-resistant brace can yield when it is subjected to axial tensile and compressive loads,thereby dissipating the energy input from the external dynamic loads and reducing the dynamic response of the building.However,most of the existing anti-buckling supports are all-steel type and concrete grouting type,which are heavy and complicated to process,so they cannot be applied to light-weight large-span space structures.Therefore,it is necessary to developing a lightweight buckling-restrained brace suitable for large-span space structures.In this paper,the aluminum alloy material is used as the restraining part of the anti-buckling support which is widely used in industry,and a new type of lightweight buckling-resistant brace is designed by improving the ordinary steel pipe buckling-resistant brace.The overall design and theoretical checking analysis of the light buckling-resistant brace are carried out in this paper,and the reasonable reliability of this design was proved.Six triple-tube anti-buckling restraint bar and fifteen double-tube anti-buckling restraint bar are manufactured successively in this paper.The tension-compression reciprocating tests of these specimens are carried out by MTS fatigue testing machine,the study analyzes the hysteretic energy dissipation characteristics,ultimate bearing capacity and component failure characteristics of these specimens and related design parameters to the impact of performance.Based on the skeleton curve and hysteresis curve of the light anti-buckling constrained member,a bilinear restoring force model of this type of specimen was obtained.Finally,the ANSYS finite element software was used to model and analyze the single-layer reticulated shell model with light-weight buckling-resistant brace members.By inputting differentseismic waves,the vibration-damping effect of the light-weight buckling-resistant brace members on the large-span space structure was verified.The research shows that the light weight buckling-resistant brace developed in this paper is light in weight,easy to manufacture,and has a good and stable energy consumption effect.by making holes in the core tube to make the core unit yield in advance,it can automatically distinguish between the yield section and the non-yield section,which can be avoided The shortcomings of the common anti-buckling restraint members are too much reinforcement at the end.this light-weight buckling-resistant brace has a good damping effect on the single-layer spherical reticulated shell. |
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