Probabilistic Analysis of Indeterminate Highway Bridges Considering Material Nonlinearity

摘要: i Abstract With ever-reducing maintenance budgets and ever-deteriorating bridge infrastructure, the assessment of existing bridges is vital. Reliability analysis techniques are becoming increasingly popular in structural safety structures. Commonly, a component based approach used reliability techniques. Traditional procedures often employ conservative definition failure, that deemed to have failed when strength capacity has been exceeded at single cross section. As result, component's degree redundancy ductility ignored, giving an estimate load carrying component. Therefore, this dissertation focused on development procedure which accounts for material behaviour indeterminate beams. The representative group steel composite beams examined. response each beam subjected combination both dead live assessed using one-dimensional nonlinear finite element (NFEA) model. Response Surface Method (RSM) then replace NFEA model with approximated explicitly-known polynomial function. This allows First Order (FORM) be performed. developed compared traditional regard three limit states. These states defined as elastic member first formation plastic hinge ultimate failure. Ultimate failure occurs collapse mechanism formed. structure consists annual maximum traffic loading events determined from Monte Carlo Simulation (MCS) Weighin Motion (WIM) data. modelling realistic loads highlights practicality developed. may act foundation evaluation method accounting nonlinearity