Model test study on mechanical performance of spoke truss suspend-dome structure
The spoke truss suspend-dome structure is a new type of structural system developed from the traditional suspend-dome in recent years.It optimizes the upper reticulated shell into a spatial radial pipe truss structure,and the lower part continues to adopt a cable structure.The two are connected by vertical struts to form a self-balanced system,which not only retains the advantages of traditional suspend-dome structure,such as strong spanning ability and beautiful shape,but also solves the problem of weak overall stiffness and poor stability of large-span structure.In order to study the static performance and dynamic characteristics of the spoke truss suspend-dome structure,a 1:10 scale model of the structure is made.The multi-condition static loading test,local cable force relaxation test and structural natural vibration characteristic test are carried out,and the axial force and displacement variation law of the structure under different loads and the distribution characteristics of natural vibration frequency are obtained respectively.The results show that the designed loading scheme meets the requirements of test accuracy.Under the action of uniform load,the upper chord and lower chord of the main truss are always in compression state,the middle member gradually changes from compression to tension with the increase of load,and the innermost member of the ring bar bears the maximum pressure.The internal force of each member increases linearly with the increase of load value,and the node displacement and cable force change evenly.The structure is in the elastic stage within the design load range,and the overall coordinated deformation ability is strong.The field measurement shows that the fundamental frequency of the model is 7.965Hz.The first 10 modes are symmetrical and dominated by the overall mode.Compared with the traditional suspend-dome structure,the structure has greater rigidity and stronger stability.
suspend domemodel teststatic performancevibration responsefinite element simulation
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