Mechanical Characteristics Analysis And Experiment Studies On The Continuous Curved Box-girders Bridge

Continuous bridge’ maximal feature is to utilize pivot’ hogging moment to reduce the midspan’s agging moment so as to severalty section’s stress are more uniformity and aggrandizement bridge’span capacity.Basket type section possess bulking property well section torsion resistant moment of inertia large.Along with our traffic oceanographical development, city overpast even more development promptitude, camber beam bridges’ application are abroad in our country bridge construction for its strong adaptation road line style、curve grace and others features.Yet, along with linear intricacy, so as to its stress property gotten intricacy.Once be in trouble, people who do not know about fact sometimes think its engineering quality, thereby initiate people’s social dissatisfaction emotion, and bring negative impacts on social stability and solidarity.Yet, some questions are owing to design specifications itself lie definite vice, the bridge has inborn problem after designing.Scholar expand numerous studies both here and abroad are aimed at camber beam’s curvature problem.Now, internal bridge design norm about curve bridge design has not special supervise norm, most design staff are still reference straight pontine design when they design curve bridge,it may be appropriate toward radius of curvature major camber beam, however, curve bridge in service arisen a variety of condition from reis could known it is by all appearances discrepancy camber beam pontine weighted property when the radius of curvature lesser camber beam bridge.So if we want to solve these issue,we must recognize the stress characteristically of camber beam bridge in real and summarize out the rule of conversion of camber beam bridge stress characteristic to supervise practice.This text adopts finite element method to built different radius of curvature’s model、 simulation manifold behaviour and comprised it with equal span diameter’straight bridge on static performance and dynamic characteristics to arrive at rule.And built a model based on a real curve beam bridge and scene activity test to evaluate its working order in actuel. This text mostly carry out development work as follows based on a actuel four striden curve series case beam bridge:1. Expound a variety of pathology of camber beam bridge and analyze pathology’form cause;Summarize and analyze stress property of camber beam bridge.2. Derivate camber beam bridge computational finite element method in order to analyze efect of curvature on bridge stress characteristic, adopt shl163board shell cell in ansys to built different curvature finite element model.Simulate a variety of behaviour under different curvature bridge’static performance and contrast static force response result in camber beam bridge inside and outside.Meanwhile, built finite element model whose central angle range from0degree to180..extraction each curvature’s front five exponent frequency and array type and contrast result with each others.Arrive at several conclusions as follows:(1) When camber beam bridge under besides deflection load, its deflection and stress calculation result maxima increase24%compare to beeline beam bridge owing to camber beam bridge proper crankle coupling acting, these point inter-alia with caution at camber beam camber beam.(2)extractive deflection and stress calculation proven inside cost less than homologous straight bridge result while outer-side just the reverse when load act on camber beam bridge cross section cross section.(3)curve beam bridge’ verticality vibration frequency value decrease along with curvature aggrandizement and basically assume tail wire sex-change with curvature.(4)camber beam bridge’s vibration of lower order mostly give priority to verticality vibration,however torsional vibration dawn to vibration of lower order along with curvature.3. definitude series case beam bridge static load test’ commonly process and proceed approach on each link critical technology problem.Adopt ansys’s shell63board cell to built finite element model.Carry out this bridge’s static load test and test key sectional static force response.Evaluate structural static force usability on static force response test result.4. definitude series case beam bridge dynamic load test’ commonly process and proceed investigation on the sample frequency’ set and kinetic parameter’ identification solution.Stipulate for power measuring point’ disposal scheme based on result of vibration mode.Adopt environment inspirit method to shock excitation on bridge structure to test each power measuring point’ time interval response.Adopt advanced ERA method to identify out kinetic parameter from dynamic response and evaluate bridge’ dynamic behaviour based on kinetic parameter.