Research On Analysis Of Mechanical Performance And Construction Key Technologies Of A New Type Of Tensile Beam Suspendome Structure

Based on the traditional suspen dome structure,the tensile beam suspendome structure is a rigid and flexible spatial prestressed hybrid structure.The middle circle is adjusted to be single-layer and parallel radial cables and tensile beams,and its shape is novel.Based on the project background of Qingdao Citizen Fitness Center,this dissertation studies the mechanical properties and construction key technologies of the tensile beam suspendome structure,including structural static and dynamic performance analysis,detailed analysis of the whole construction process,construction monitoring,coupled random error analysis,cable clamp anti sliding performance analysis,etc.The specific research content and conclusions are as follows:Firstly,the combination analysis of ultimate bearing capacity state and normal service limit state is carried out under the action of dead,live,wind and temperature loads,and the key response of the structure is obtained,which shows that it has good mechanical properties.The basic dynamic characteristics of the structure are grasped by modal analysis,and the structural vibration mode is reflected in the bending of the central depression area.Secondly,in the analysis of prestressed tension process,the incremental ratio force finding method is improved,and the original linear fitting is replaced by quadratic parabola fitting,which improves the analysis efficiency;in the analysis of ring cable lifting,the nonlinear dynamic finite element shape finding method(NDFEM)based on parabola fitting is adopted to solve the static unbalance problem of super large displacement which is difficult to converge.In order to overcome the problem that the vibration frequency of the short cable is disturbed by many factors,the bending stiffness is identified according to the measured multi-step natural frequency,and the accurate formula of the relationship between cable force and natural frequency is established to calculate the cable force.The deviation of the measured cable force meets the specification requirements.Then,in order to determine the control standard of tensile beam suspendome,the coupling random error analysis method based on cable length,external connection node and tension force is proposed.Based on ANSYS~?software,the APDL program for error analysis of cable structure is compiled.The distribution mode of sample error and response error is analyzed,and the influence of confidence interval guarantee rate and sample size on response error is explored.The error distribution law of the structure is summarized and explained,and the error control mode and standard are determined.Furthermore,a comprehensive theoretical analysis and experimental study are carried out for the key cable clamp joints in cable structures.Based on the theory of transversely isotropic materials and generalized Hooke's law,a theoretical model is established to calculate the attenuation value of the fastening force of the cable clamp high-strength bolt caused by the tension of the cable.In this dissertation,a new anti slip test method of cable clamp is proposed,which fully considers the cable tension force,and real-time monitoring of various responses including the tightening force of high-strength bolts.Based on the experimental study,the three stages and failure mechanism of cable clamp slip are revealed and summarized,and relevant suggestions for the design and construction of cable clamp are given.Finally,this dissertation summarizes the above research work and achievements,and looks forward to the direction of further research.