Study On The Simplified Calculation Method Of Extra-large Span Steel Truss-concrete Composited Continuous Irgid Frame Birdge

Based on west traffic construction scientific item “steel-concret composite archbridge key design and construction of erect rotation”leaded by tutor，Aimed at theshortcoming of prestressed concrete continuous rigid frame bridge,such as concreteshrinkage, creep that is difficult to control,long risk period,based on the idea“extra-large span steel truss-concrete continuous rigid frame bridge” proposed bytutor,the text do some in-depth research on calculation method of this newstructure,main research as follow：①Based on the preliminary design of support project，proposed a simplifiedcalculate model，do large numbers of analysis using finite element software，clearlyunderstand the structure mechanical performance。②In order to reveal the response of the structure under load，calculate the trussdeflection by theory analysis，and compile programme，demonstrate it’s correctby contrast with finite element method.③Considered bridge panel and shearing bond affect truss by changing it’sstiffness，truss is the still main bearing body, proposed the concept“bridge deck affectcoefficient”,resolve calculation problem when design using partial shearing connection.④Deduce the calculation method of using energy method，calculate connection ofbridge deck affect coefficient and shearing stiffness，compile calculate programme thatcan be reference to project application.⑤Anew concept “shearing sensitive intervals “is proposed in this paper，shearingconnector stiffness clearly affect the structure mechanical performance,a truss-concrete continuous rigid frame bridge,which span is84m+148m+84m,is calculated.