Guest editorial: Nonlinear modelling of reinforced concrete structural walls

2019 ◽  
Vol 17 (12) ◽  
pp. 6359-6368 ◽  
Author(s):  
M. Fischinger ◽  
T. Isaković ◽  
K. Kolozvari ◽  
J. Wallace
Keyword(s):  
Reinforced Concrete ◽  
Guest Editorial ◽  
Structural Walls ◽  
Nonlinear Modelling

scholarly journals An estimation method for seismic effects of reinforced concrete non-structural walls to structural frame members

1989 ◽  
Vol 22 (2) ◽  
pp. 90-97
Author(s):  
Masamichi Ohkubo
Keyword(s):  
Reinforced Concrete ◽  
Residential Buildings ◽  
Estimation Method ◽  
Structural Members ◽  
Seismic Effects ◽  
Structural Walls ◽  
High Rise ◽  
Structural Frame ◽  
Weak Points

To resolve the undesirable effects of reinforced concrete non-structural walls to the earthquake behaviour of structural members, weak points (called "Structural Slits") are intentionally provided at the connection between structural members and non-structural walls. This paper presents an estimation method for the stress developed in the "Structural Slits" which are applied to the non-structural walls of reinforced concrete high-rise residential buildings.

Seismic Rehabilitation of a School Building in Cephalonia, Greece

2020 ◽  
pp. 1-20
Author(s):  
Christos Giarlelis ◽  
Evlalia Lamprinou ◽  
Constantinos Repapis
Keyword(s):  
Reinforced Concrete ◽  
Response Spectrum ◽  
Earthquake Sequence ◽  
School Building ◽  
Structural Walls ◽  
Concrete Walls ◽  
Seismic Rehabilitation ◽  
Reinforced Concrete Walls ◽  
Structural Capacity ◽  
Structural Failures

<p>The 2014 earthquake sequence in Cephalonia, Greece, resulted in a number of structural failures. In Argostoli, the capital of the island, a school building suffered light damage; however, the structural assessment following the analysis procedures of the recently published Greek Code for Structural Interventions, showed that seismic strengthening is required. The structure was built on the aftermath of the catastrophic 1953 Ionian earthquake sequence based on older code requirements, which are much outdated, as indicated from the results of both modal response spectrum analyses and non-linear static analyses. The retrofit aims to increase the very low structural capacity of the building and as a means for that the use of concrete jackets is selected. Based on the results of the assessment, it was decided that concrete jackets should be applied to all columns, while large structural walls running along the transversal direction were strengthened with single-sided reinforced concrete jacketing. The interventions are limited by architectural demands and cost considerations. However, analyses of the strengthened structure show that the interventions improve its seismic behaviour adequately. The detailing of interventions is thoroughly presented. What makes this case study interesting is the unusual structural system of the building, which is an ingenious combination of frame elements and lightly reinforced concrete walls and its behaviour to one of the strongest recent Greek earthquakes. The rehabilitation study had to model correctly the structure and propose interventions that were in agreement with the architectural demands and the cost consideration.</p>

Influence of lateral loading direction on the peak shear strength of non-rectangular reinforced concrete squat walls

2019 ◽  
Vol 22 (11) ◽  
pp. 2392-2405 ◽  
Author(s):  
Jiaxing Ma ◽  
Bing Li
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Seismic Waves ◽  
Lateral Loading ◽  
Peak Shear Strength ◽  
Lateral Loads ◽  
Structural Walls ◽  
Finite Element Software ◽  
Loading Direction ◽  
Squat Walls

Peak shear strength is a critical parameter in the evaluation of the seismic performance of structural walls. Different equations have been proposed to predict the peak shear strength of reinforced concrete squat walls in literature, which assume lateral loading is parallel to the web. In reality, however, seismic waves can reach structures from any direction, which necessitates the studies on the behavior of structural walls under various lateral loading directions. Unlike rectangular walls, non-rectangular walls naturally possess the capacity to resist lateral loads in both transverse and longitudinal directions. To explore the peak shear strength of such walls under different lateral loading directions, a widely used nonlinear finite element software Diana 9.4 was utilized in this article. Appropriate modeling approaches were first selected and further validated by simulating relevant experiments. Then a comprehensive parametric study was carried out to investigate the influence of lateral loading directions and other important parameters.

Seismic response of structural walls: recent developments

2001 ◽  
Vol 28 (6) ◽  
pp. 922-937 ◽  
Author(s):  
T Paulay
Keyword(s):  
Reinforced Concrete ◽  
Seismic Response ◽  
Seismic Design ◽  
Limit State ◽  
Lateral Force ◽  
Structural Walls ◽  
Structural Class ◽  
Response Component ◽  
Displacement Ductility ◽  
Ductility Capacity

It is postulated that for purposes of seismic design, the ductile behaviour of lateral force-resisting wall components, elements, and indeed the entire system can be satisfactorily simulated by bilinear force–displacement modeling. This enables displacement relationships between the system and its constituent components at a particular limit state to be readily established. To this end, some widely used fallacies, relevant to the transition from the elastic to the plastic domain of behaviour, are exposed. A redefinition of stiffness and yield displacement allows more realistic predictions of the important feature of seismic response, component displacements, to be made. The concepts are rational, yet very simple. Their applications are interwoven with the designer's intentions. Contrary to current design practice, whereby a specific global displacement ductility capacity is prescribed for a particular structural class, the designer can determine the acceptable displacement demand to be imposed on the system. This should protect critical components against excessive displacements. Specific intended displacement demands and capacities of systems comprising reinforced concrete cantilever and coupled walls can be estimated.Key words: ductility, displacements, reinforced concrete, seismic design, stiffness, structural walls.

Performance of School Buildings in Turkey During the 1999 Düzce and the 2003 Bingöl Earthquakes

2009 ◽  
Vol 25 (2) ◽  
pp. 239-256 ◽  
Author(s):  
Turel Gur ◽  
AliCihan Pay ◽  
Julio A. Ramirez ◽  
Mete A. Sozen ◽  
Arvid M. Johnson ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
School Buildings ◽  
Floor Plan ◽  
Structural System ◽  
Concrete Frames ◽  
Structural Walls ◽  
Concrete Walls ◽  
Moment Resisting Frame ◽  
Moment Resisting ◽  
The Moment

Several school buildings were surveyed in the disaster areas of the Marmara (17 August 1999, [Formula: see text]), Düzce (12 November 1999, [Formula: see text]), and Bingöl (1 May 2003, [Formula: see text]) earthquakes in Turkey. Among them, 21 reinforced concrete buildings were found to have an identical floor plan. Lateral load resisting structural system consisted of reinforced concrete frames (moment-resisting frame) in 16 of the buildings and structural concrete walls integrated with the moment-resisting frame (dual system) in the remaining five buildings. The number of stories above ground in these buildings ranged from two to four. These school buildings provide a nearly ideal test of the effect of a single important structural characteristic on the performance of buildings with structural designs that are uniform in all other respects. Our observation is that the presence of structural walls improves the behavior of reinforced concrete systems drastically.

UTILIZATION OF STEEL FIBERS IN DIAGONALLY REINFORCED CONCRETE COUPLING BEAMS AS ADDITIONAL TRANSVERSE REINFORCEMENTS

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Hyun-Do Yun ◽  
Seok-Joon Jang ◽  
Sun-Woo Kim ◽  
Wan-Shin Park
Keyword(s):  
Reinforced Concrete ◽  
Volume Fraction ◽  
Reinforced Concrete Beam ◽  
Steel Fibers ◽  
Coupling Beam ◽  
Coupling Beams ◽  
Structural Walls ◽  
Cyclic Shear ◽  
Double Curvature ◽  
Structural Behaviors

The purpose of this study is to investigate the feasibility of using hooked-end steel fibers as additional transverse reinforcements such as cross ties and leg bars for diagonally reinforced concrete (DRC) coupling beams aligned vertically over coupled special structural walls. Three 1/3-scale short beams were made and tested under cyclic shear in a double curvature condition. All specimens have the same reinforcement configuration except for transverse reinforcing details and the clear span length-to-section depth ratio (lnh) of 2.0. Reinforced concrete (RC) coupling beam (RC-CB) was designed with full confinement of diagonally reinforced concrete beam section based on the seismic design provisions of the ACI 318-14 Code. To improve the constructability without sacrificing strength and ductility, the fiber contents in the FRC0.75-CB and FRC1.50-CB specimens replacing additional transverse bars with steel fibers were 0.75% and 1.50% at volume fraction, respectively. Test results revealed that additional transverse reinforcement in the diagonally reinforced coupling beams have a significant effect on the cracking and structural behaviors. For diagonally reinforced coupling beams with only hoops and without crossties and legs of hoop, the addition of steel fiber at volume fraction of more than 0.75% to concrete provides equal cracking and structural behaviors as compared to those of diagonally reinforced coupling beam with full confinement details.

Numerical Modeling of Rectangular Reinforced Concrete Structural Walls

2017 ◽  
Vol 143 (6) ◽  
pp. 04017031 ◽  
Author(s):  
Farhad Dashti ◽  
Rajesh P. Dhakal ◽  
Stefano Pampanin
Keyword(s):  
Numerical Modeling ◽  
Reinforced Concrete ◽  
Structural Walls
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