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"Time-Dependent Seismic Reliability of Aging Structures" by Cao Wang and Lip H. Teh

The capacity deterioration of structures over time may impair their seismic structural reliability significantly, and, thus, they should be taken into account when assessing their seismic performance. In this study, a closed-form solution was proposed for time-dependent seismic reliability analysis of deteriorating structures. The capacity deterioration on the temporal scale was captured by the generalized capacity and deterioration function, and the Fréchet distribution was used to describe the probabilistic behavior of the peak ground acceleration. The deterioration of structural seismic capacity was modeled by a power function of time, and, thus, it was a nonlinear process if the exponent was other than 1. For a representative case, with some minor assumptions about the probability models of the deterioration process and of the seismic hazard, the proposed reliability analysis method was further simplified without the computation of integrals, which is beneficial for use in practic ....

Aging Structures , Closed Form Solution , Eneralized Capacity Deterioration , Eismic Reliability , Ime Dependent Reliability ,

"Estimation of time-dependent reliability of aging structures under cor" by Cao Wang

This paper proposes explicit approaches for time-dependent reliability assessment of aging structures, taking into account the correlation associated with the load process and that arising from the resistance deterioration process. For the load process, temporal correlation may arise due to the impacts of underlying common causes. With this regard, a closed-form solution is developed for structural reliability, which models the sequence of load effects as a Markov process. Furthermore, the resistance deterioration is by nature a non-increasing stochastic process with autocorrelation on the temporal scale. The Gamma process is used to describe the stochastic behaviour of resistance deterioration, based on which an explicit reliability method is derived. The proposed reliability methods are straightforward to implement and thus are promising to be adopted in practical engineering regarding the safety evaluation of aging structures. Illustrative examples are presented to demonstrate the a ....

Closed Form Solution , Road Process , Esistance Deterioration , Emporal Correlation , Ime Dependent Reliability , மூடப்பட்டது வடிவம் தீர்வு ,