Static Mechanical Property And Construction Simulation Of Two-way Grid Reticulated Domes With Tension Members

With the progress of the times,the continuous improvement of people's requirements on architectrueis not limited to the function and practicality,but also requires aesthetic and meterial efficiency.Large span space structure as a dome structure,requires excellent light transmission effect and lightweight.The traditional triangular meshed rigid reticulated shells is contrary to the above development requirements,while the stability of the quadrilateral meshed reticulatedd shells is poor.In order to solve this problem,a new type of two-way grid reticulated domes with tension members is proposed in this paper.Through the use of ANSYS program to carry out the static performance research and construction simulation research,in order to develop a reasonable structural system and provide a reference for relevant projects.Specific research includes the following aspects:(1)According to the structural characteristics of two-way grid reticulated domes,the advantages and disadvantages of the existing two-way grid reticulated shells with prestressed cablesor rods are analyzed and compared.The principles of the arrangement of the prestressed rods are proposed,and based on whicha new structural system is proposed.(2)Using the APDL language of ANSYS program,the parametric modeling program which is easy to calculate and adjust is prepared,and the normalization step of structural modeling based on ANSYS software is obtained.The numerical modeling method and analysis method of this structure are determined.The rationality of the numerical simulation method and the arrangement of the prestressed rods is validated by analyzing the basic static performance of the typical example.(3)Considering the factors such as structural span,span ratio,uneven load distribution,supporting rod length,initial defect and prestressing force of rods,the static performance of the structure is systematically researched.The influence of parameters on the mechanical properties of the structure is analyzed by the displacement,internal force,ultimate bearing capacity and instability mode of the structure under static action.The basic laws of the structure are summarized the recommended value of the parameters is proposed.The mechanical properties of the structures are verifiedin large span examples,and the applicability of this structural system in large span area is studied.(4)Aiming at the tensioning sequence of the rods during the construction process,several schemes of the prestressing sequence of the in-plane oblique rod and the out-ofplane transverse rod are proposed.The influence of the prestressing sequence on the construction process is studied by features of the maximum displacement and the ultimate bearing capacity of each stage in the process of structural construction.The reasonable construction method suitable for this structure is proposed,which provides theoretical support for practical engineering.