| The displacement-based earthquake loss assessment methodology (DBELA) has been developed in recent years, it uses the mechanics derived relationship between the structural displacement capacity, the vibration period and original height to obtain the displacement capacity and the displacement demand function which given in terms of limit states, structural material and geometrical properties. By plotted the displacement capacity spectrum with the displacement demand spectrum of a single earthquake scenario in the same coordinate, the structural vulnerability can be easily obtained by comparing the height of performance point and the structural height. As the seismic vulnerability assessment method is to be implemented in the urban scale, and structural parameters are different from one building to another. So, the influence of parameter variation should be considered. The structural parameter database used for establishing the vulnerability model is huge, so it is necessary to rational allocate the parameter field research workload according to the results of the sensitivity of the parameters. In this paper, we will solve two problems:the probabilistic calculation method and the parameter sensitivity.Based on the mechanics derived equation of displacement capacity and displacement demand, we establish the limit state function. Taking advantage of the first order reliability method(FORM) to calculate the failure probability of limit state function. Then we verified the accuracy of FORM. Seismic vulnerability assessment on the beam-sway RC structure indicates that this method can obtain the vulnerability analysis result easily by the probability distribution of structural parameters.In this paper, the sensitivity of the field classification, peak ground acceleration, the mean and variance of the structural parameters have been analyzed by the proposed probabilistic method. The quantified results are used to distribute the workload. |
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