Static & Dynamic Analysis Of Continuous Rigid Frame Bridge And Measure Test On Concrete Stress

Based on the design of a continious rigid frame brigde called Tianchi JinShaJiang Bridge under construction, a finite element model of entire bridge was established with beam element using MIDAS/CIVIL, which is a large-scale finite element software. Concrete stress and deformation in construction stages are analyzed considering the influence of concrete's time-dependent effect as a result of shrinkage and creep on the structure. Meanwhile, the structural bahaviour in operation stage is reexamined and analyzed according to [code for design of highway reinforced concrete and prestressed concrete bridges andculverts(JTG D62-2004)]. Also in this thesis, the characteristic of natural vibration of the bridge is researched, including natural frequency and period of vibration, and the earthquake response is calculated with response spectrum method to analyze whether the structure's earthquake resistance does satisfy the design requirements.Another subject of this thesis is to study the separation of actual strain by concrete stress test. According to the characteristic of cantilevering construction method, concrete's creep factor is obtained combining limited creep test data and theoretical formula, and creep strain was calculated using effective elastic model method by age-adjusted, then the creep is separated. By this separation theoretical stress of concrete in the girder is found to correspond fairly well with the measured results. Therefore, the author has not only understood the static and dynamic performance of continual rigid frame bridge comprehensively and mastered the computation analysis method of this kind of large-scale bridge, but also elaborated the separation of actual strain in the concrete stress test procedure.