| Metal sheet has high strength and large in-plane stiffness,but it is susceptible to deformation when subjected to out-of-plane loads,making it difficult to control.In order to increase the out-of-plane stiffness of metal sheet,prestressing can be applied to make it a load-bearing structure.Based on the design concept of combining "enclosure + structure" in large-span space structures,the "cable-stayed metal sheet structure" system is proposed by combining the cable-stayed structure system with metal sheet.This article selects 5083 aluminum alloy with good corrosion resistance and processability as the metal sheet material.Through three-dimensional modeling,model testing,and finite element numerical simulation,the structural construction process,system modeling methods,multi-parameter optimization,and mechanical properties are studied..The main content is as follows:(1)The finite element analysis model of 1 span 2 trusses of cable-stayed sheet metal structure was established,and the influence of 4 construction methods on the static properties of the cable-stayed sheet metal structure was studied,and the optimal construction method was obtained.The finite element analysis model of the construction process of 6 trusses of 1span cable-stayed sheet metal structure and the finite element analysis model of structural joints was established to study the static properties of the structural system and joints.The equal scale model test was carried out to compare the test data with the simulated data.The results show that the optimal construction method is the tension cable-stayed method;the displacement and stress values of the four designed nodes meet the requirements;and the variation trends of the measured and simulated data during the construction process are the same.Given the presence of multiple sources of error,the construction method is considered feasible.(2)Based on Rhino software,the basic logic of parametric modeling and progra mming is given;By using the control variable method,the study investigates the effec ts of parameters such as span ratio,metal sheet thickness,cable cross-sectional area,a nd cable position on the static performance of the structure,and determines the appro priate ranges for each parameter.The results show that when the independent variable is span ratio,the appropriate value for the span ratio is 0.35;when the independent variable is metal sheet thickness,the appropriate range for thickness is 0.3mm to 0.8m m;when the independent variable is cable diameter,the appropriate diameter is around 10mm;and when the independent variable is cable position,the cable position should be determined by the equal arc length method.(3)In this paper,a reasonable construction scheme is selected for a long span p roject using cable-stayed metal sheet.The finite element model of the project is establ ished,and the static properties under six kinds of load combinations are studied.The results show that under the vertical live load,the sheet metal deforms downward,resis ting the upward deformation caused by the prestressed load,and the stress of the shee t metal decreases.The wind suction load and temperature rise will cause the upward and lateral deformation of the sheet metal,which will increase the stress of the sheet metal and the stay cable,and decrease the stress of the back cable.In this case,it is necessary to control the stress of the back cable to avoid the withdrawal of the wor k due to relaxation. |
