Reliability Analysis Of A Rigid Frame Bridge With High Pier Large Span During Construction Period

The basket symmetrical cantilever construction, which is often used, is one way of large-span bridge construction. With the length of cantilever longer, the risk is increased as well. The results of investigation indicate that accidents are more frequent during construction period than using period. So analysis and study of structure reliability during construction period must be emphasized. Reliability analysis for structure can reveal safety of construction structure in order to determine a reasonable plan and provide reference.On the basis of structure reliability principles, this essay studies the reliability of prestressed-concrete rigid-frame bridge with high-pier and large-span during construction period.1. Based on the features of rigid frame bridge with high-pier and large-span, the resistance of high pier and probability model of load and correlative formulas under largest cantilever and imbalanced load conditions are established.2. The random nature of load construction is analyzed. According to analyze various factors on change of reliability index, casting girder,construction live load,concrete intensity,wind load,construction distribution load deviation and basket falling ,which influence on construction reliability of rigid frame bridge with high-pier and large-span, are obtained. In the practical construction, the direct and indirect factors which have relatively great influence on reliability indexβgreatly should be controlled strictly.3. According to calculations and examples, this method can effectively analyze the reliability of rigid frame bridge with high-pier and large-span during construction period.4. Wind load has great influence on construction, but the self error of casting girder and basket load have greater influence, especially, basket falling is directly responsible for the safety of construction. Construction distribution load has minor influence on the reliability of construction.5. As for cantilever rigid frame bridge with high pier and large span, it is the...