Load Investigation During Construction Of Long-Span Continuous Beam Bridge By Cantilever Casting

The structural resistance and the load action vary obviously with time and influence the safety of bridge greatly during construction, and there is no sufficient consideration about them. This is one of the important reasons which cause accidents during construction more than that in service period.This thesis reviews the existing state of research to domestic and international reliability, analyses the rules and characteristics of bridge load, describes the importance of bridge load inverstigation during construction. The method of anti-error least squares of weighted distance is put forward. The nonstationary time series random process model is established. The corresponding formulas are deduced. The programs based on method of anti-error least squares of weighted distance and the nonstationary time series random process model are developed by language MATLAB.According to the site investigation and statistical analysis results of XiangYin Bridge across the XiangJiang River, the loads during construction are classified. The established load model during construction and the deduced formula of action to the structure are proved to be accurate by compareing with the actually measured data. The conclusion of this paper could serve the study and disign of long span bridge, and give the sample model and reference for reliable testing.