Concrete Filled Steel Tube Arch Pipe Concrete Hydration Heat And Perfusion Solutions

The extradosed cable-stayed bridge is in continuous beam bridge with tra-ditional cable-stayed bridge on the basis of the development of a new type ofcomposite structure bridge, because of its beautiful appearance, economic performance and maturity of the technology, to be able to develop quickly, especiall-y in the city of bridges can be a very good application. For this type of bridg-e main beam under axial pressure, not only, but also bear a considerable partof the bending moment and shear force, the stress state is complex, the spaceeffect phenomenon is very outstanding. With this kind of bridge span and gird-er transverse width increasing, the Box Girder Cantilever longer, box girder sh-ear lag effect is more obvious. Studies have shown that, due to the shear lageffect caused by the construction process in some cases box beam internal forc-e values than into bridge state force, makes some construction internal force tobecome the design control value.This article take the Chongqing Hechuan bridgeⅠ as engineering background, using the MIDAS software to establish the bridge geometry space truss m-odel, on the main beam construction process simulation, for the overall stress a-nalysis of main girder in stages; through the establishment of the whole bridgemodel, the main beam entity of the overall analysis, the bridge of long cantilever box girder space stress distribution characteristics. The main research cont-ents are as follows:First, use MIDAS/CIVIL for the bridge in bridge finite element analysis,a brief introduction to the simulation method, computational analysis of the bri-dge during the construction of the largest cantilever bridge and into the state o-f the internal condition, summed up space stress distribution characteristics, forthe whole bridge local and integral finite element analysis provide a basis;In second, against the background of engineering bridge, unfolding entityfinite element simulation analysis, study its construction process in the largestcantilever girder bridge and into the state of distribution, and the comparativeanalysis of plane linkage model results, while the tower girder consolidation period of partial analyses, summarizes the rule of design and construction to provide the related basis;In third, in view of the concrete filled steel tube structure in the cavity i- n concrete after perfusion defects such as phenomenon, using ultrasonic detecti-on method of steel core concrete slab calculation analysisLast, against the background of engineering for the long cantilever box gird-er of cable-stayed bridge with low towers, will affect the main beam stressdistr-ibution of sensitivity to several parameters were studied, in order to get reason-able structural arrangement and economic structure, at the same time as similarbridge research preparation.