The Static Analysis And Temperature Effect Of Span Prestressed Concrete Continuous Rigid Frame Birdge

With the development of bridge building andconstruction technology,prestressedconcretecontinuous rigid frame bridge are more and more applied because of the span,easeof construction,engineering and low cost advantages. In some of the span prestressedconcrete continuous rigid frame bridge, the cantilever construction is the most popular. Themost critical of the cantilever construction are to meet the bridge deck linear and the load ofthe construction process. The construction monitoring can provide technical guidance andtechnical services in the process of construction to ensure the quality of the cantileverconstruction. In the large size of the bridge structure,the influence of the temperature effecton the structure cannot be ignored, especially large-size concrete hydration heat impact andtemperature stress of the solar radiation. The same time, the close are also a vital criticalconditions of the continuous rigid frame bridge and the close quality determines the successclose quality determines the success or failure of the bridge construction, so it has beensubject to the extensive attention of the engineering staff. The Article take large spanprestressed concrete continuous rigid frame box girder bridge of ruchen high speed road–shandianjiang bridge as the research background, and using finite element analysis softwareMidas, ANSYS, FBR to calculate the static analysis, hydration heat, solar radiation of themain beam and the influence of joint temperature, and research the occurring problems oftenof the prestressed concrete continuous rigid frame bridge.1. Utilizing the finite element analysis software Midas and FBR to build the finiteelement model of the whole bridge for shandianjiang bridge, and analysis the bridge staticwith bridge construction scheme and construction monitoring program, and compared withthe two calculation results under different conditions, and compared with the theory value andthe measured value and the difference is very small.It confirmed that the selected constructionconfirmed that the selected construction control scheme is reasonable and effective for thecontrol of bridge construction and provide scientific guidance for the construction process.2.It test the hydration heat in pouring0~#early for shandianjiang bridge, and calculate thetransient simulation of the heat of hydration process by using the solid element-solid70~#offinite element analysis software ANSYS, and compared with the measured results andcalculated results. The two data indicate that the temperature trend of the concrete within10hours pouring is basically the same, in line with the variation that the early rise, the latedecline and the last stabilized. The temperature of the structure10hours after is stabilized.High temperature is easily form the early cracks on the bridge structure. Measuringthe temperature gradient embedded in the bridge cross-section in the solar radiation andcalculating the box girder stress. The results show that: the maximum tensile stress occurs inthe roof contact with the web, and the stress value reached2.859MPa,so it should be takenseriously enough in the design and construction.3. According the years of climate data of bridge site, assuming four closure temperature,and calculate the bridge in different situation by using the finite element analysis softwareMidas. In the different close temperatures, the most unfavorable combination of stress in thestructure of the normal use in the limit state of the main beam is remains the same, thepile bottom sections is the most unfavorable cross-section of the force structure.The largertemperature loads have a greater stress on continuous rigid frame bridge pier and piles,and general it was become the control load of structural and design.So it should try to choosea low temperature to close.