Force–displacement behavior of unbonded post-tensioned concrete walls

Hassanli, Reza; ElGawady, Mohamed A.; Mills, Julie E.

doi:10.1016/j.engstruct.2015.10.035

Cited by 28 publications

(30 citation statements)

References 11 publications

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“…1. The maximum compressive stress in the concrete at the decompression point at the column toe, f co , is usually a small value and a linear stress-strain relationship can be considered before the decompression point (Hassanli et al 2016a). Therefore, the compression stress at distance x from the column heel can be expressed as,…”

Section: Force-displacement Response At Decompression Pointmentioning

confidence: 99%

“…The analytical method they developed could effectively predict the lateral behavior of the masonry walls. Hassanli et al (2016a) applied the procedure to concrete walls and showed that it could accurately predict their lateral force behavior. In this study the same procedure was considered, however, it was modified to be appropriate for column members.…”

Section: Analytical Approachmentioning

confidence: 99%

“…No comprehensive study was found in the literature evaluating the plastic hinge length of UPTSCs, hence, the following expression, which was originally developed for wall member (Hassanli et al , 2016a) was adopted in this study,…”

Section: Force-displacement Response Beyond Decompression Pointmentioning

confidence: 99%

“…Self-centering behavior can be induced to the system by employing unbonded post-tensioning (PT) steel. In these systems the residual drifts and the damage to the structure in seismic events are limited, resulting in reduced cost associated with structural repair and business downtime (Hassanli et al 2016a). Self-centering concrete systems can display a ductile response and carry high levels of lateral loads (Henry 2011).…”

Section: Introductionmentioning

confidence: 99%

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Analytical Study of Force–Displacement Behavior and Ductility of Self-centering Segmental Concrete Columns

Hassanli

Youssf

Mills

et al. 2017

Int J Concr Struct Mater

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In this study the behavior of unbonded post-tensioned segmental columns (UPTSCs) was investigated and expressions were proposed to estimate their ductility and neutral axis (NA) depth at ultimate strength. An analytical method was first employed to predict the lateral force-displacement, and its accuracy was verified against experimental results of eight columns. Two stages of parametric study were then performed to investigate the effect of different parameters on the behavior of such columns, including concrete compressive strength, axial stress ratio, diameter and height of the column, axial stress level, duct size, stress ratio of the PT bars, and thickness and ultimate tensile strain of fiber reinforced polymer wraps. It was found that the column's aspect ratio and axial stress ratio were the most influential factors contributing to the ductility, and axial stress ratio and column diameter were the main factors contributing to the NA depth of self-centering columns. While at aspect ratios of less than ten, as the axial stress ratio increased, the ductility increased; at aspect ratios higher than ten, the ductility tended to decrease when the axial stress ratio increased. Using the results of parametric study, nonlinear multivariate regression analyses were performed and new expressions were developed to predict the ductility and NA depth of UPTSCs.

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Section: Force-displacement Response At Decompression Pointmentioning

confidence: 99%

Section: Analytical Approachmentioning

confidence: 99%

Section: Force-displacement Response Beyond Decompression Pointmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analytical Study of Force–Displacement Behavior and Ductility of Self-centering Segmental Concrete Columns

Hassanli

Youssf

Mills

et al. 2017

Int J Concr Struct Mater

Self Cite

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“…Aaleti and Sritharan [139] developed a simplified approach using a trilinear function of the neutral axis depth at a drift of 2%. Hassanli et al [194] developed an analysis procedure to characterize the lateral force behavior of unbonded posttensioned concrete walls (PT-CWs) based on the mechanics of rocking walls and geometric compatibility conditions; the force-displacement curve of unbonded PT-CW could be predicted with a very good accuracy.…”

Section: Analysis Of Monotonic Seismic Behavior and Design Of Drsrs Smentioning

confidence: 99%

High Performance Damage‐Resistant Seismic Resistant Structural Systems for Sustainable and Resilient City: A Review

Wang

Hua

2018

Shock and Vibration

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This paper presents a review of high performance damage-resistant seismic resistant structural (DRSRS) systems for the sustainable and resilient city. Firstly, the motivation and the basic principle as well as methodology of the developing DRSRS system are briefly illustrated. Then, the structural detailing and the seismic behaviors of three types of existing DRSRS systems, namely, the replaceable structural element (RSE), rocking seismic resisting structural (RSRS) system, and self-centering seismic resisting structural (SCSRS) system, are summarized in detail. The theoretical and extensive experimental study results indicated that the three existing types of DRSRS system can minimize the postdamage after loading. Types of energy dissipation devices and dampers, as well as fuse sections, can largely enhance the energy dissipation capacity of the proposed structural system. Many numerical and finite element models have been proposed to analyze the dynamic and static cyclic responses of them. The residual deformation after the dynamic response is smaller compared to that following the cyclic response. Then, the current research challenges of DRSRS system are illustrated, and the new research highlights that emerged in recent years are stated. Finally, the conclusions of this paper are summarized; furthermore, the recommendations for the future studies are pointed out at the end of the paper.

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Theoretical study on the nonlinear contact mechanism of reinforced self‐centering bridge pier system based on the Winkler model

Zhang,

Li,

Zhang

2023

Earthq Engng Struct Dyn

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Self‐centering (SC) bridge piers generally set one or several gaps to avoid the occurrence of plastic hinges and mitigate both damage and residual drifts during major earthquakes. However, the gap opening mechanism also produces new problems in theoretical analyses, such as the strong nonlinear contact motion behavior between adjacent segments. An accurate contact mechanism is therefore significant to describe the gap‐opening process and evaluate the mechanical properties of rocking systems. Firstly, for the low‐damage SC bridge pier system especially with different reinforcement measures in contact segment, this study investigated the nonlinear contact mechanism by decoupling the linear and nonlinear motions of the SC bridge pier system, which were elastic‐body rotation and contact segment bending‐to‐yielding, respectively. Secondly, the entire gap opening process was divided into three stages, and force analysis of the contact segment in each stage was conducted. Subsequently, the differential equations and rotation equation of the contact segment were established and derived based on the Winkler model. The corresponding contact parameters in the equations were obtained. The proposed equation was verified using published experimental data. In addition, finite element analysis (FEA) results showed that the rotation equation can accurately describe the contact state at each moment during the entire nonlinear contact process. Finally, the key parameters describing the contact state is investigated including the contact width, rotation posture, rotation angle, and contact stress. The results show that proposed theory can accurately predict the improvement effect of hysteretic performance for different reinforced measures on the rocking interface, which will be helpful and efficient for the optimal design of reinforced SC bridge pier system.

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Force–displacement behavior of unbonded post-tensioned concrete walls

Cited by 28 publications

References 11 publications

Analytical Study of Force–Displacement Behavior and Ductility of Self-centering Segmental Concrete Columns

Analytical Study of Force–Displacement Behavior and Ductility of Self-centering Segmental Concrete Columns

High Performance Damage‐Resistant Seismic Resistant Structural Systems for Sustainable and Resilient City: A Review

Theoretical study on the nonlinear contact mechanism of reinforced self‐centering bridge pier system based on the Winkler model

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