| The Disc-buckled full support system has the advantages of high bearing capacity,strong structural integrity and simple erection.It is widely used in the field of formwork support.However,due to various problems,support instability and collapse accidents are common.There are many risk factors in the construction process of support,and the safety risk of support is becoming more and more prominent.So,study the stability of disk lock steel tubular scaffold analysis and safety risk assessment is of great significance.In this thesis,through the theoretical analysis of the stability of the disc-type full-hall support,taking a ramp bridge project as the background,the structural stability of the disc-type full-hall support is checked.Through the combination of actual engineering and finite element simulation,the factors affecting the stability of the Disc-buckled full support are analyzed,and the safety risk assessment of the Disc-buckled full support is carried out.The main contents of the thesis are as follows:(1).Based on the engineering background of a ramp bridge disc buckle full framing,the probabilistic limit state design method is used to check the disc buckle full framing structure.Combined with the actual support engineering parameters,Midas/Civil finite element software is used to model the full hall support,and the results are compared with the measured engineering results.The results show that the finite element model of the disk-buckle full hall support can truly simulate the stress situation of the support structure,and verify the safety and stability of the full hall support structure.(2).Finite element numerical modeling analysis of factors influencing the button type full framing design structure to support the effect on the stability of the security.Through the control variables,the changes of different factors and parameters on the critical buckling load of the support were studied.The variation law of the bearing capacity of the Disc-buckled full support system is obtained.(3).With reference to relevant literature and specifications,various risk factors affecting the safety of disc-buckled full support are analyzed,and the safety risk assessment index system of disc-buckled full support is constructed.A comprehensive weighting method combining analytic hierarchy process and entropy weight method is proposed to determine the weight of support index,and a safety risk assessment model of disc buckle full support based on matter-element extension theory evaluation method is established.(4).Application of safety risk assessment model in engineering example of disc buckle full support,and the safety risk assessment of the disc-type full hall support is carried out to obtain the risk level of the disc-type full hall support project.Analysis proves the matter-element extension and comprehensive empowerment theory in disc full support project feasibility in the evaluation of security risks. |
