| As a main form of large-span spatial structure,the suspended-dome structure is widely used in various important public buildings because it can reduce the structural member stress,the structural displacement,and the horizontal thrust at the support and can improve the overall stability by introducing prestress in the cable-strut system.In actual engineering,the prestress is mostly applied by tensioning hoop cable,but there is friction slip between hoop cable and the cable-strut joint,which will cause prestress friction loss and thus affect the overall static performance of the structure.This paper is based on the project of National Natural Science Foundation of China(51708067): A study on the friction slip mechanism of cable of suspended-dome structure and its effect on structural performance,and friction slip of the cable-joint contact pair was investigated by a combination of experimental study and numerical simulation,and the influence of the variability of the friction slip coefficient on the static performance of the suspended-dome structure was analyzed by ANSYS.The main research work of this paper is as follows.(1)Considering the effects of tension and angle of cable segments on the friction slip of the cable,the parameterization experiment of friction slip of the cable-joint contact pair was carried out by independently designing and producing the cable-strut joints with different angles of cable segments to analyze the prestress loss of the cable and stress distribution laws of twisted wires along the length direction and along the circumference of the cable section.(2)Based on the Spatial Coordinate Transformation Theory,the internal geometry of the cable was analyzed,and the refine finite element models of cable-joint contact pair considering friction slip were established by Auto CAD 和 ABAQUS.The numerical simulation results were compared with the experimental results.The prestress loss of the cable under each load level was analyzed,the stress distribution laws between the straight section and the bent section of the cable were compared,and the contact state between the wires was studied.A bending-tensioning numerical simulation method is provided that is highly similar to actual engineering and can be applied to long cable with large section.(3)Friction slip coefficient was introduced,and the experimental results were compared with the numerical simulation results to clarify the effects of tension,angle of cable segments and twist distance on the friction slip coefficient,and the preliminary study on the value-taking of friction slip coefficient was completed.(4)Taking a gymnasium in Shandong as an example,the corresponding overall model of the suspended-dome structure was established by ANSYS.Different friction slip coefficients were efficiently introduced in the analysis to investigate the influence law of the variability of friction slip coefficient in the construction stage on the deformation and member axial force of the upper reticulated shell,and the axial force of oblique cable of the cable-strut system to accurately grasp the static performance of the suspended-dome structure and ensure the safety and reliability of the structure. |
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