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Effect of Steel Jacketing on Seismic Vulnerability of Pile-Supported Wharves
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Abstract
Pile-supported wharf structures are a common type of berthing facilities in seaports which have exhibited considerable vulnerabilities to moderate to strong ground motions. Considering the undeniable role of pile-supported wharves on the effective performance of seaports and hence world's economy, seismic vulnerability assessment and retrofit of these vital structures is a key issue. In this paper, effect of steel jacketing, as a retrofit measure, on the seismic vulnerability of a typical pile supported wharf is investigated. The seismic vulnerability of structures is usually expressed in the form of fragility curves. These curves show the probability of exceeding a damage from a predefined damage state under a suit of ground motions. In addition, these curves provide a helpful tool for evaluating the effect of retrofit measures on the seismic performance of structures under a wide range of seismic loading levels. In this paper, detailed three dimensional models of a pile supported wharf including the as-built and retrofitted wharf are constructed. Incremental dynamic analysis (IDA) is performed using eight ground motion records to study nonlinear dynamic responses of the wharf. Then, based on the seismic responses and predefined damage states, the fragility curves of the as-built and retrofitted wharf are established. Finally, the efficiency of the retrofit technique on the seismic response of the structure is evaluated by comparing the fragility curves before and after the retrofit. It is observed that the level of damage probability for the retrofitted wharf is less than that of the as-built one for all level of seismic excitations. This paper can help decision makers to compare the results of steel jacketing method with another methods and select suitable retrofit technique for pile supported wharves.
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