Structural and Nonstructural Performance Evaluation of Self-Centering, Concentrically Braced Frames under Seismic Loading

Dyanati, Mojtaba; Huang, Qindan; Roke, David A.

doi:10.1061/9780784413357.210

Cited by 11 publications

(6 citation statements)

References 11 publications

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“…The capacities for non-structural components are also obtained from ASCE-41 (2007), in which non-structural components are categorized as drift sensitive (i.e., exterior walls and heavy partitions) and acceleration sensitive (e.g., HVAC and fire suppression systems) components. The capacities for non-structural elements are defined based on to previous work by Dyanati et al (2014) and are presented in Table 6.1.…”

Section: Seismic Fragility Assessmentmentioning

confidence: 99%

Seismic performance assessment of self-centering dual systems with different configurations

Kafaeikivi

2016

Structures

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Concentrically braced frame (CBF) systems have limited capacity for lateral displacement, causing structural damage that leads to high post-earthquake costs under moderate earthquakes. Self-centering concentrically braced frame (SC-CBF) systems have been developed to soften the lateral force-lateral drift response of the system without causing structural damage; however, the construction cost of SC-CBF systems is expected to be high due to the precision required in fabrication and erection. To take advantage of the ductility of SC-CBFs and the economy of conventional CBFs, a novel dual system has been proposed in which the lower stories of the lateral force resisting system are SC-CBFs and the upper stories are conventional CBFs. The SC-CBF is intended to act as a ductile sub-structure for the CBF, reducing the construction costs and post-earthquake costs. This study presents the design basis of the dual system and an investigation of the influence of dual system configuration on structural performance. To achieve this goal and demonstrate the effectiveness of the proposed dual system, a probabilistic performance assessment is conducted in this study, considering both structural and nonstructural components. Firstly, eight prototype buildings are designed with the same configurations and gravity systems but different lateral load resisting systems (CBF and iv dual systems). Then, nonlinear time history analysis is performed using 3D numerical modeling to obtain seismic responses under a suite of ground motions. Next, probabilistic demand models are developed to predict the selected engineering demand parameters. To develop probabilistic demand models, several intensity measures are investigated to determine the best link between ground motion properties and structural and nonstructural responses. The demand model parameters are estimated from regression analysis based on the responses obtained from nonlinear time history analysis of the finite element models. Moreover, hazard analysis is performed to quantify the seismic hazard for the structures. Three different locations inside the United States are considered in the hazard analysis: Los Angeles (high-seismic zone), Seattle (moderate-seismic zone), and Boston (low-seismic zone). Using detailed demand models, the corresponding capacity limits, and calculated intensity hazards, seismic fragility curves and engineering demand hazard curves are developed for three performance levels for structural and non-structural components. Finally, loss analysis is conducted to estimate expected annual loss and payoff periods for different structural systems. The results of this study show that the dual system can be an efficient structural system for mid-rise buildings in high-seismic zones. Moreover, the time in which the higher initial construction costs of the dual systems are compensated by lower earthquake-induced losses in the lifetime of structures is calculated and presented for different configurations of the dual system. v ACKNOWLEDGEMENTS The research presented in ...

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Section: Seismic Fragility Assessmentmentioning

confidence: 99%

Seismic performance assessment of self-centering dual systems with different configurations

Kafaeikivi

2016

Structures

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“…They found that the dual system is less vulnerable than a conventional CBF system. Dyanati et al (2013Dyanati et al ( , 2014 compared CBF and SC-CBF systems using their fragility curves and found that an SC-CBF system is less likely to exceed a given performance level than a conventional CBF system.…”

Section: Relevant Prior Researchmentioning

confidence: 99%

Seismic Response Prediction of Self-Centering, Concentrically-Braced Frames Using Genetic Programming

Gandomi

Roke

2014

Structures Congress 2014

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One of the commonly used earthquake-resistant structural systems is the conventional concentrically braced frame (CBF) system, which is widely used in the US. However, CBFs have limited drift capacity prior to a brace buckling occurrence. Selfcentering concentrically braced frame (SC-CBF) systems have been recently developed to increase drift capacity prior to initiation of damage and to minimize residual drift. SC-CBF systems have more complex behaviors than conventional CBFs: the seismic response of SC-CBF systems depends on many new parameters such as rocking behavior, post-tensioning bars, and energy dissipation elements. Additionally, uncertainty of earthquake properties affects the system response. An accurate prediction of roof drift is essential to the design of SC-CBF systems. In this study, a robust modelling tool, genetic programming, is used to predict the peak roof drift response under seismic loading. At first, the design and analysis procedure of the SC-CBF is automated in this study, as is not available in current design software. Three levels of complexity are considered for the numerical models: i. Linear materials and geometry ii. Nonlinear materials and linear geometry iii. Nonlinear materials and nonlinear geometry I would like to thank my research advisor and chair of my thesis committee, Dr. David A Roke, for his constant guidance, support, direction, and advice for the past couple of years. I would also like to thank the following people for their contributions to my research: the civil engineering department staff, particularly Ms. Kimberly Stone for their support, and fellow students Amir H. Alavi and Parvin Arjmandi for their helps. Most importantly, I would like to extend my sincerest thanks to my friends and family who have offered help and inspiration along the way. I extend a special thanks to my parents their counsel and immense contribution throughout my academic life. vii

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“…For instance, application of post-tensioning re-centering systems to the precast structure have been studied by Priestley et al (1999) and bracing systems providing energy dissipation capacity and restoring force have been developed (Chou et al, 2016; Christopoulos et al, 2008; Miller et al, 2012). Post-tensioned tendons have been used in pre-stressed precast shear walls, reinforced concrete moment frames (Rahman and Sritharan, 2007), and steel-braced frames (Dyanati et al, 2014; Eatherton et al, 2014; Roke and Jeffers, 2012) to provide stiffness and restoring force. The super-elastic property of shape memory alloy has been used to produce damping devices having both energy dissipation and self-centering capability (Dolce and Cardone, 2006; Ingalkar 2014).…”

Section: Introductionmentioning

confidence: 99%

Seismic retrofit of structures using rotational friction dampers with restoring force

Naeem

Kim

2020

Advances in Structural Engineering

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In this study, the seismic performance of a rotational friction damper with restoring force is presented. The torsional spring friction damper consists of rotational friction pads with the heavy duty torsional springs attached on both sides of the friction damper. An analytical model and a design procedure for the damper are developed using capacity spectrum method. A parametric study is carried out to investigate the influence of the torsional spring in the response of the structure when subjected to ground motions. The seismic performances of steel structures retrofitted with the torsional spring friction damper and conventional rotational friction dampers are evaluated using fragility analysis, which shows that the structure retrofitted with the torsional spring friction damper has the smallest probability of reaching the specific limit states.

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Structural and Nonstructural Performance Evaluation of Self-Centering, Concentrically Braced Frames under Seismic Loading

Cited by 11 publications

References 11 publications

Seismic performance assessment of self-centering dual systems with different configurations

Seismic performance assessment of self-centering dual systems with different configurations

Seismic Response Prediction of Self-Centering, Concentrically-Braced Frames Using Genetic Programming

Seismic retrofit of structures using rotational friction dampers with restoring force

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