Research on Performance and Construction Technology of Straddle Monorail Bridges
To solve the current problems of lack of technical standards,complex construction conditions,and high linear accuracy requirements for straddle monorail bridges,the performance and construction technology of straddle type monorail bridges were systematically studied.By conducting actual tests on the static and dynamic stress performance of the straddle type monorail bridge structure,and statistical analysis of measured dynamic and static load data,the force characteristics of cross seat monorails were studied,the relationship between structural fundamental frequency and dynamic coefficient was analyzed.Through regression analysis,after appropriate revisions,a calculation formula suitable for the"structural fundamental frequency dynamic coefficient"of straddle type monorails was preliminarily summarized.Through the study of fatigue design formulas and fatigue effects,fatigue damage correction factors were introduced by studying the load effect ratio spectrum of a train passing through bridges of different spans.Based on the number of operations during the design lifespan,the load effect ratio spectrum within the design lifespan was obtained,as well as the value of the damage correction coefficient.By developing a temporary consolidation system that could be finely tuned in three dimensions,a continuous steel truss beam adjustable temporary consolidation system was proposed,which included three parts:concrete locking blocks at the pier top,temporary members,and adjustable pier body embedded parts,to solve the technical difficulties in construction of difficult adjustment of errors in different directions and high requirements for linear accuracy in the rotation construction of large-span steel truss track beam bridges.
straddle monoraildynamic coefficient of track beamfatigue damage correction coefficientthree-dimensional fine tunedtemporary consolidation system
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