Torsional coupling effects in the earthquake response of asymmetric buildings

1986 ◽  
Vol 8 (4) ◽  
pp. 222-236 ◽  
Author(s):  
A.M. Chandler ◽  
G.L. Hutchinson
Keyword(s):  
Earthquake Response ◽  
Coupling Effects ◽  
Asymmetric Buildings ◽  
Torsional Coupling

scholarly journals Metamodel Approaches in Predicting the Seismic Response of Asymmetric Buildings

2021 ◽  
Author(s):  
Philip Luke Karuthedath ◽  
Deepak Sahu ◽  
Robin Davis P
Keyword(s):  
Seismic Response ◽  
Computational Effort ◽  
High Dimensional Model Representation ◽  
Centre Of Mass ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Asymmetric Buildings ◽  
Torsional Coupling ◽  
Computationally Intensive ◽  
Free Vibration Response

Asymmetry formed as a result of the eccentricity between the positions of Centre of Mass and Centre of Stiffness can cause undesired torsional coupling and can weaken the seismic performance of buildings and structures. This dynamic response is further affected by the randomness in material, geometric and loading properties caused as a result of uncertainties in construction and functioning. Stochastic analyses methods such as Monte Carlo Simulation have been found to accurately characterize this randomness and uncertainty, but are computationally intensive as well as expensive. This necessitates the need for alternative analyses methods that are much simpler and can fairly represent the uncertainties while preserving the similarity in results. The present investigation considers the various metamodel approaches in non-statistical stochastic analyses methods in determining the seismic response of asymmetric buildings. The study observes the efficiency of the High Dimensional Model Representation (HDMR) approach in accurately predicting the free vibration response of a reinforced concrete frame with the least number of samplings points as well as computational effort as compared to other response surface methods. For further validation, a non-linear reliability analysis was carried out at HDMR sampling points to obtain the seismic fragility of the building considered, the results of which satisfied the fragility obtained using conventional methods.

scholarly journals A modified approach to earthquake resistant design of torsionally coupled buildings

1988 ◽  
Vol 21 (2) ◽  
pp. 140-153 ◽  
Author(s):  
A. M. Chandler ◽  
G. L. Hutchinson
Keyword(s):  
Time History ◽  
Dynamic Responses ◽  
Building Model ◽  
Asymmetric Buildings ◽  
Building Models ◽  
Earthquake Resistant Design ◽  
Modal Coupling ◽  
Torsional Coupling ◽  
Lateral Displacements ◽  
Coupled Buildings

All major building codes employ empirical procedures to account for modal coupling between the lateral and torsional responses of a structure. These procedures are implemented using expressions
defining an equivalent static design torque. The provisions are based largely on the results of parametric investigations of the earthquake response of simple single-storey building models, which are found to
be representative of regular multi-storey structures. This paper presents results obtained by the analysis of the time-history earth- quake response of a single storey mono-symmetric building model, leading to the development of an alternative approach for defining the design torque for torsionally coupled buildings. The procedure is based on the concept of effective eccentricity, in which the design lateral displacements of key structural members on the edge of the building are matched to the results of a dynamic analysis. A close approximation to the dynamic responses is derived over the relevant ranges of the important parameters. These parameters include the ratio of torsional to translational natural frequencies, which strongly influences the magnitude of torsional coupling effects in asymmetric buildings.

Influence of the Isolated Layer Damping Distribution of the Lateral-Torsional Coupling Isolated System on Earthquake Response

2011 ◽  
Vol 368-373 ◽  
pp. 1186-1191
Author(s):  
Xiang Zhen Li ◽  
Yi Feng Xie ◽  
Bing Li
Keyword(s):  
Dynamic Equations ◽  
Simplified Model ◽  
Earthquake Response ◽  
Dynamic Parameters ◽  
Structure Dynamic ◽  
Torsion Effect ◽  
Torsional Coupling

On the basis of the simplified model of lateral-torsional coupling isolated structure, dynamic equations of non-proportional damping isolated system of lateral-torsional coupling is established, and the influence of the isolated layer and the superstructure damping dynamic parameters on earthquake response is calculated and analyzed. The results show that, by reasonable adjustment of the damping distribution of the isolated layer, the torsion effect of the superstructure can be significantly reduced, and the basis displacement as well as rotation can be better suppressed, providing a basis for the design of the isolated layer damper reasonable distribution.

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