High-Rise Buildings under Multi-Hazard Environment: by Mingfeng Huang

By Mingfeng Huang

This e-book discusses performance-based seismic and wind-resistant layout for high-rise development constructions, with a specific specialize in constructing an built-in strategy for performance-based wind engineering, that's presently much less complicated than seismic engineering. This e-book additionally presents a state of the art overview of diverse methodologies, together with computational fluid dynamics (CFD), severe worth research, structural optimization, vibration keep watch over, pushover research, reaction spectrum research, modal parameter id for the evaluation of the wind-resistant and seismic functionality of tall constructions within the layout degree and real tall constructions in use. numerous new structural optimization tools, together with the augmented optimality standards strategy, were constructed and hired within the context of performance-based layout. This publication is a helpful source for college kids, researchers and engineers within the box of civil and structural engineering.

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Quasi-Newton or variable-metric method (Kirsch 1993) uses the Fig. 3 Structural Design Optimization 29 approximate forms of the Hessian matrix and its inverse. Davidson–Fletcher– Powell (DFP) update procedure builds up approximate inverse of the Hessian matrix using only the first derivatives (Fletcher and Powell 1963). Broyden– Fletcher–Goldfarb–Shanno (BFGS) update procedure builds up approximate Hessian matrix rather than its inverse (Kirsch 1993). Constrained problems can often be transformed into unconstrained problems with the help of Lagrange multipliers k.

Chapter 8 discusses the performance assessment of real tall buildings under multihazard environments. Structural dynamic performance of a 270-m high-rise building in Hong Kong was investigated by means of full-scale measurements and wind tunnel tests. Recently proposed fast Bayesian method and traditional random decrement technique (RDT) combined with Hilbert Huang transform (HHT) method were both adopted to identify modal properties including natural frequencies and damping ratios under the typhoon and earthquake events.

1 Performance-Based Engineering and Design 17 Structural damping has remained the most uncertain parameter in the dynamic design of civil engineering structures. Structural damping prediction relies upon a high degree of empiricism that is almost entirely based upon full-scale measurements (Glanville et al. 1996). Several damping empirical models were derived from the analysis of damping data obtained from a wide and homogeneous set of full-scale measurements of buildings and other structures (Lagomarsino 1993; Lagomarsino and Pagnini 1995).

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