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Optimal weakening and damping using polynomial control for seismically excited nonlinear structures

Earthquake Engineering and Engineering Vibration 2009年第4期8卷 607-616页

作者： Gian Paolo Cimellaro Department of Structural & Geotechnical Engineering(DISTR)

This paper presents an approach for the optimal design of a new retrofit technique called weakening and damping that is valid for civil engineering inelastic structures. An alternative design methodology is developed with respect to the existing ones that is able to determine the locations and the magnitude of weakening and/or softening of structural elements and adding damping while insuring structural stability. An optimal polynomial controller that is a summation of polynomials in nonlinear states is used in Phase I of the method to reduce the peak response quantities of seismically excited nonlinear or hysteretic systems. The main advantage of the optimal polynomial controller is that it is able to automatically stabilize the structural system. The optimal design of a shear-type structure is used as an example to illustrate the feasibility of the proposed approach, which leads to a reduction of both peak inter-story drifts and peak total accelerations.

关键词： weakening and damping optimal design optimal polynomial controller inter-story drift acceleration

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A SIMPLE RELOCATION STRATEGY FOR OPTIMAL PLACEMENT OF DAMPERS OF BUILDING STRUCTURES

A SIMPLE RELOCATION STRATEGY FOR OPTIMAL PLACEMENT OF DAMPER...

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第六届海峡两岸及香港钢及组合结构技术研讨会—2010

作者： L.J.Leu Department of Civil Engineering National Taiwan University

This paper proposes a simple and effective approach for allocating dampers in multi-story shear *** approach consists of the following ***,dampers are placed uniformly at each story of some selected bays of the shear ***,the time-history seismic analysis is ***,relocate dampers by moving dampers located at the stories with lower inter-story drift ratios to the stories with higher inter-story drift ratios. Repeat the former process until the prescribed stop criterion is *** linear and nonlinear viscous dampers(with two exponents,including 0.3 and 0.5) are used in this *** results are compared with those obtained using the simplified sequential search algorithm (SSSA).It is found that the proposed approach requires much fewer number of time-history analysis than that using the SSSA while their accuracy is *** is also found that the efficiency of the proposed approach for allocating non-linear viscous dampers is comparable to or better than for allocating linear viscous dampers.

关键词： Optimal Damper Placement SSSA Viscous Damper inter-story drift

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