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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 ,

CNN Early Start With John Berman and Christine Romans July 15, 2014 09:38:00

States and has the potential to make costs spike for 5 million americans and complicate the obamacare process. the already complicated process. weeks before programs are scheduled to run out of money, president obama will make a big push today for more funding for infrastructure projects. house republicans are taking action. they are expected to vote on a bill to extend funding for the federal highways until the middle of next year. democrats say it s not comprehensive enough to fix the aging structures and delays a long-term solution. moving ahead to update the emergency alert system on television. it would allow the president to enter a code in order to speak to the entire country all at once in the event of a national emergency. the current system is not capable of reaching the whole population in a single broadcast. it will be open today and open for public comment for 30 days. ....

Mo Ney , Obamacare Process , Big Push , 5 Million , White House , Infrastructure Projects , Aging Structures , Emergency Alert System On Television ,