RC Structure Reliability Design For Expected Service Life And Its FRP Strengthening And Monitoring

As for the reinforced concrete(RC) building structure in aggressive environment, and with the threat of earthquake, researches on its reliability design, seismic performance analysis and FRP strengthening and monitoring are conducted in the three levels of structure elements, global structure and city buildings.Firstly, a practical reliability design method of RC structure with expected service life is proposed in this paper. The typical RC elements are designed basing on the principle of Chinese unified standard for reliability design of building structure(GB 50068-2001). The resistance attenuation of each element is considered in the design process, and the statistical parameters of the elements are assumed to be the same as the investigated results of China. In the process of the calculating of the element reliability attenuation in expected service life, several load combination and different load ratio of dead load to live load are considered. In order to ensure that structure reliability in expected service life satisfies the requirement of today's code, a method of choosing the initial reliability index of structure basing on the length of expected service life and the structure resistance attenuation is proposed and the corresponding durability reduction factor is chosen by an optimum algorithm. An example is given to verify the method proposed in this paper.Secondly, the influence of lateral force in pushover analysis(POA) is evaluated. Three structures of five, ten and fifteen stories are designed in accordance with Chinese code for seismic design of building. Typical earthquake records are selected and artificial earthquake wave under consideration are designed according to the response spectrum of Chinese code. Nonlinear time history analysis(NL-THA) to each building with the eight earthquake wave altogether as input are conducted, and the pushover analysis(POA) and the capacity-Demand-Diagram methods(CDDM) analysis with five common lateral force patterns are carried out on each building. Interstory drifts of each structures obtained from NL-THA and CDDM analysis are compared. The selection of lateral force pattern is commenced in terms of the floor numbers of building and...