Simplified Calculation Approach of Torsionally Coupled Seismic Response for Base-Isolated Eccentric Structures

Li, Hong‐Nan; Li, Ying; Wu, Xiangxiang

doi:10.1260/136943307781422226

Cited by 5 publications

(4 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, Matsagar and Jangid (2005) investigated the effects of torsional coupling due to isolator parameters on the seismic response of base-isolated buildings. Li et al (2007) proposed a simplified calculation approach of the torsionally coupled seismic response for base-isolated eccentric structures. Mazza (2014) developed a computer code for the non-linear static analysis of spatial framed structures with an asymmetric plan based on arc-length methods.…”

Section: Introductionmentioning

confidence: 99%

Inelastic parametric analysis of two-way asymmetrical multi-storey buildings

Xin-liang

Kuang

2016

Advances in Structural Engineering

View full text Add to dashboard Cite

This article presents a parametric study on the lateral-torsional coupling behaviour of the simplified bidirectional asymmetric multi-storey dual lateral load-resisting model. The implementation process for establishing the simplification model is shown in an illustrative example on a three-storey reinforced concrete building system. Combined with the force–displacement relationships of the lateral load-resisting members and the inter-story restoring force models, the dynamic stiffness matrix and the equations of motion under different loading conditions can also be determined. On this basis, parametric analyses for the systems are carried out through the whole loading process from the elastic stage to the inelastic stage. Effects of uncoupled torsion to lateral frequency ratios (Ω) and the stiffness eccentricities on the frequencies are investigated. The analysis shows that the asymmetrical system with a smaller Ω value has a smaller torsional stiffness and a stronger lateral-torsional coupling effect. The effects of the eccentricities in both directions on the frequencies are remarkably different. Smaller Ω values and greater eccentricities lead to greater reductions in the effects of Ω and eccentricities on the frequencies in the inelastic stage.

show abstract

Section: Introductionmentioning

confidence: 99%

Inelastic parametric analysis of two-way asymmetrical multi-storey buildings

Xin-liang

Kuang

2016

Advances in Structural Engineering

View full text Add to dashboard Cite

show abstract

“…Li et al (2007) focused their studies on the torsional acceleration of the structure . This parameter is important because the seismic action torque is equal to the moment of inertia of the structure multiplied by the torsional acceleration of the structure.…”

Section: Introductionmentioning

confidence: 99%

“…Finally, the response of a six-storey asymmetric building demonstrated the application of the proposed procedure, and the results are compared with the exact response at both edges computed from the integration of the motion equations of the isolated structure. Li et al (2007) focused their studies on the torsional acceleration of the structure θ¨s. This parameter is important because the seismic action torque is equal to the moment of inertia of the structure multiplied by the torsional acceleration of the structure.…”

Section: Introductionmentioning

confidence: 99%

Effect of two horizontal components of earthquake on nonlinear response of torsionally coupled base isolated structures

Khoshnoudian

Azad

2011

Structural Design Tall Build

View full text Add to dashboard Cite

SUMMARY Torsion in base‐isolated structures using bilinear rubber isolators effected by two horizontal components of earthquake simultaneously is investigated under various principal parameters including number of storeys; ratio of uncoupled torsional frequency to lateral frequency in the superstructure; ratio of uncoupled torsional frequency to lateral frequency in the isolation system; mass eccentricity in the superstructure and isolation system; and, in addition, the direction of eccentricity. Structure was supposed a shear structure and it was modeled by using concentrated mass and springs. Isolators are modelled by using nonlinear springs considering the interaction of isolator behaviour in two directions. The effect of variation in considered parameters on the behaviour of the superstructure and isolation system is investigated under seven ground motions. It is demonstrated that the parameters affect asymmetric structure behaviour with respect to symmetric one. The results of our investigations help us to understand the asymmetric structure behaviour under bidirectional earthquake by comparing it with a symmetric one. These results demonstrate that asymmetry in the superstructure or isolation system could have a significant effect on the torsional behaviour of isolated structures. In addition, the results show that the use of rigid superstructures and calculation of dynamic torsion by multiplying eccentricity by the dynamic base shear are unacceptable assumptions. Torsional effect on the isolated structural behaviour is amplified by considering two horizontal components of earthquake and comparing them with just one horizontal component. Copyright © 2010 John Wiley & Sons, Ltd.

show abstract

“…It was concluded that the effects of mass eccentricity (CM) causes more torsional amplifications relative to stiffness eccentricity (CS) (Tena-Colunga and Escamilla-Cruz 2007). Li et al (2007) developed a method to study the torsionally coupled seismic responses of base-isolated structures. Hence, three formulas for different types of soil were proposed employing the torsional structure parameters such as eccentricities, the radius of gyration of the isolator and superstructure, uncoupled torsionlateral frequency ratio in the superstructure as well as lateral acceleration of the structure.…”

mentioning

confidence: 99%

Torsionally Seismic Behavior of Triple Concave Friction Pendulum Bearing

Fallahian

Khoshnoudian

Loghman

2015

Advances in Structural Engineering

View full text Add to dashboard Cite

In this paper, attempts are made to investigate the responses of torsionally coupling base-isolated structure supported on Triple Concave Friction pendulum bearing (TFP) subjected to near field ground motions. Nonlinear dynamic analyses are conducted to study the effects of essential parameters such as superstructure and isolation system eccentricity, and the uncoupled torsional to lateral frequency ratio of superstructure on seismic responses of TFP isolated structures. Further, the responses of base-isolated structure using TFP are compared with the same base-isolated structure using friction pendulum system (FPS) as well as double concave friction pendulum (DCFP). Results indicate that TFP isolated structure significantly outperforms other types of friction bearings. Moreover, increasing effective period causes TFP isolated structures to behave better than the others in reducing torsional responses of structure. It is concluded that effectiveness of TFP isolators in respect to others bearings is negligible on seismic responses of structures through increasing effective damping.

show abstract

Simplified Calculation Approach of Torsionally Coupled Seismic Response for Base-Isolated Eccentric Structures

Cited by 5 publications

References 20 publications

Inelastic parametric analysis of two-way asymmetrical multi-storey buildings

Inelastic parametric analysis of two-way asymmetrical multi-storey buildings

Effect of two horizontal components of earthquake on nonlinear response of torsionally coupled base isolated structures

Torsionally Seismic Behavior of Triple Concave Friction Pendulum Bearing

Contact Info

Product

Resources

About