Design of a Tall Building in the Framework of Performance-Based Wind Engineering

Abstract eng:
The authors have proposed recently a general theoretic setup for the performance-based design of structures under wind actions [1]: the study has been developed in the framework of PerformanceBased Wind Engineering (PBWE). The procedure considers performances related to safety or functionality and comfort, and consists of the following steps: (a) defining the Aeolian hazard at the site, in terms of the parameters of a specific model of the wind velocity field; (b) defining the models of the wind-structure interaction phenomena and their relevant parameters; (c) analyzing the structural response, mainly in the context of stochastic dynamics; (d) defining and evaluating indicators of the structural damage; (e) defining the decision variables that are appropriate to quantify the performances required for the structure, in terms of consequences of damage (personal damages, restoration costs, costs due to loss or out-of-service, variations of users comfort, etc.); (f) evaluating the structural risk on the basis of the probabilistic characterization of the decision variables; (g) optimizing design, that is minimizing risk, by appropriate techniques of decision analysis. The procedure has been applied to the risk assessment of a long-span suspension bridge [1] and a tall building [2]. In both cases, the study has been aimed at the probabilistic modeling of the wind field and the structural response. Only a conventional measure of risk has been derived, and simplified models of the relevant parameters have been adopted, as the main aim of the study was checking the feasibility and usefulness of the procedure. In this paper, the procedure is applied in a consistent manner, by considering different performance levels, related to both safety and serviceability, and adopting refined probabilistic models of the parameters characterizing the wind field, the wind-structure interaction and the structural properties. In detail, the probabilistic dependence of the parameters characterizing the wind-structure interaction on the basic parameters of the wind field and the structural properties is investigated in detail. Also the probabilistic structure of the peak factor that is adopted to evaluate the maximum response in frequency domain is investigated. The considered example case is a high-rise building; analyses are carried out in time and frequency domains, in order to characterize the structural response, in terms of floor acceleration, inter-storey drift and element resistance. With reference to any performance level, the risk is expressed in terms of the complementary cumulative probability distribution function of a decision variable that is the measurable attribute that represents the specific structural performance. The risks corresponding to different performance levels are compared in order to optimize the design of the structure. References [1] Ciampoli M, Petrini, F., Augusti G., 2009. A Procedure for the Performance-Based Wind Engineering. In: Proceedings of the Tenth International Conference on Structural Safety and Reliability (ICOSSAR’09), 13-17 September, Osaka, Japan. Boca Raton: CRC press [CD-ROM]. [2] F. Petrini, M. Ciampoli, M. Barbato. Performance-Based Design of Tall Buildings under Wind Action. In: Proc of the 2010 Structures Congress/North American Steel Construction Conference (NASCC), Orlando, USA; 2010.

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