The Curve Beam Bridge’s Crankle Coupling Effect Influence Factors Analysis

With the rapid development of China’s transportation construction, the curvedgirder bridge has been increasingly widely used in the field of bridgeconstruction.Based on the existing curve bridge theoretical studies, using finiteelement software midas Civil, modeling and analysis by grillage method for curvedgirder bridge unique "torsion coupling" effect and its impact on the parametersstudied, the main contents are as follows:①In reviewing the course of development inside and outside the curveLiangqiao Guo, based on a variety of computing theory and summarizes the relativecharacteristics and scope of the various theories of curved girder bridge; thenpresented its unique "torsion force from the characteristic curve of the bridge coupling"effect, and a brief description of the study of the meaning and value of the content.②Analysis of curve bridge "torsion coupling" effect and mathematical principlesanalytic solution, micro-beams by the equilibrium equations of the mathematicalmodel, the theoretical geometric equations and the derivation of the relationshipbetween internal forces and deformation, draw curved girder bridge "torsioncoupling" effect the main factors, including factors radius of curvature, sectionaldimensions, diaphragm layout, location and load bearing arrangement and so on.③By contrast curve characteristics and application bridge is now morecommonly used finite element analysis method described herein Grillage unit bridgecurve modeling analysis of suitability; then expounded grillage element methodsimulation modeling theory and modeling process modeling and calculationprocessing analysis points made the necessary instructions.④Finite element calculation software midas Civil grillage method modelinganalysis, by changing the parameters affecting, take different radii of curvature, theheight of the beam, the number of single-span diaphragms arranged lane position andbearing eccentric loads carried by the force and deformation bridge calculatedcontrast, the effects of different parameters on the analysis results curved girderbridge "torsion coupling" effect.The analysis results show that the curve beam bridge with the increase of radiusof curvature, the mechanical characteristics under the influence of the crankle coupling effect is more and more weak, when the radius of curvature r <90m,"crankle coupling effect on structure is very clear, when the curvature radius of90<r<190m, the impact on the structure change is relatively weak, when the radius ofcurvature r>190m, the impact on the structure change is very weak, eventuallyconverge with those of straight girder bridge mechanical characteristics; Radius ofcurvature of the bend torsion coupling effect is very obvious, the influence of theheight of the girder, transverse diaphragm set location, quantity, load bearing of theoffset while it is possible to "bend torsion coupling effect of curve beam bridge on theimproved, but the impact is relatively small, the effect is not obvious; But the supportof the lateral migration can effectively adjust the counteracting force and section sizeof the torque.Therefore, the value of the curve in bridge design radius of curvature in thetopography and surface features not restricted route requirements should be using alarge radius of curvature; when the cross-sectional dimensions selected in flexuralrigidity to meet the requirements under the premise should try to increase torsionalstiffness, torsional stiffness ratio decreases so, it bridges the curve section of lowpriority to select the design of highly torsion beam and the moment of inertia of alarge closed box section; while bearing arrangement should be considered bearingtorsional set and certain bearing eccentricity.