Safety Assessment Method Of Transverse Overturning Stability Of Single Pier Bridge

It is very important to study the overturning stability of single pier bridge,which is one of the key problems in single pier bridge research.At present,the uncertainties of the parameters in the structure were neglected in the stability evaluation method of single pier bridge,which leads to the unknown safety of the single pier bridge during the actual use.In order to solve the problem of overturning stability assessment of single pier bridge,this paper proposes a method to evaluate the stability coefficient of single pier bridge based on inverse reliability analysis theory considering the randomness of each design variable.This paper was studied mainly from the following aspects:1.Based on the inducting and analyzing of existing research results of structure reliability evaluation,due to not considering the uncertainties in parameters of existed safety assessment of single pier bridge,the safety factor assessment method based on inverse reliability theory was proposed;2.Combining the deterministic analyzing model of single pier bridge and the inverse reliability theory,a new method was proposed to calculate the safety factor,which was easily understood in engineering so that it conveniently used for engineers;3.Taking the example of single pier bridge as the research object,safety factors of overturning stability of single pier bridge were calculating using the inverse reliability,as well as parameter sensitivity analysis,the results of which were compared with the deterministic results,which indicates that ignoring parameters uncertainty will produce overestimation of stability safety level of single pier bridge.Compared to the deterministic safety factor method,the proposed method considers the randomness of each design variable.The safety factor based on the inverse reliability theory analysis quantitatively express the safety of the single pier bridge,making the analysis result more realistic and science.