Research On Risk Assessment Of Full Framing Bracket In Mountainous Area

Full framing bracket is a commonly used bridge construction method for highway interchanges in mountainous areas,because it has a large number of turnovers,a short turnover time,and the use of less auxiliary equipment,which reduces waste of manpower and resources.However,the collapse of full-frame stents for various reasons is not uncommon,which will cause a large number of casualties and economic losses.This article relies on the key technology research project of the Yunnan Provincial Department of Transportation “Research on Special Risk Assessment Techniques for Highway full framing Bracket Construction Safety”,using finite element software and accident data to conduct research on the safety issues of full framing bracket overpass in mountainous areas,with the aim of constructing the risk of full framing bracket in mountainous areas Evaluation system.details as follows:(1)Through the investigation of the data of the overpass in the mountainous area and the review of the literature,the characteristics of the cradle in the mountainous area are explained,and different evaluation methods are compared.(2)Based on the characteristics of the full framing bracket in the mountainous area,the finite element modeling of each indicator of the full framing bracket design index is performed.By comparing the changes in the various parameters,the changes in the buckling capacity are brought about.The design indexes were quantified according to the change of the buckling load,and the buckling bearing capacity was found to change regularly in the modeling.A fast calculation software was made to perform trial and check calculations on the full-frame support.(3)Based on the data of the full-frame stent accident,construct the key factors of the full-frame stent accident risk,and use Kent’s ideas to quantify the stent accident.(4)Optimize the weights of various indicators of the full framing stent based on buckling bearing capacity and accident data,and use the matter-element extension model to perform risk assessment of the full framing stent.(5)Combined with the case study of the overpass in the mountainous area of Yunnan province,the feasibility of the matter-element extension theory in the risk assessment of full framing stent was verified.