Evaluation of the level of seismic protection afforded to reinforced concrete shear wall systems

1999 ◽  
Vol 26 (5) ◽  
pp. 572-589 ◽  
Author(s):  
Brian Stonehouse ◽  
Arthur C Heidebrecht ◽  
M Reza Kianoush
Keyword(s):  
Reinforced Concrete ◽  
Pushover Analysis ◽  
Time History ◽  
Shear Walls ◽  
Shell Element ◽  
Shear Wall ◽  
Lateral Force ◽  
Damage Potential ◽  
Existing Building ◽  
Torsion Element

This paper presents the results of an investigation into the seismic level of protection afforded to reinforced concrete shear wall systems. The vulnerability and damage potential of a 30-storey building consisting of a coupled shear wall as well as noncoupled shear walls as lateral force resisting systems is evaluated. The structure, which is similar to an existing building designed and constructed in Vancouver, is designed in accordance with the 1995 National Building Code of Canada and detailed using the provisions of CAN3-A23.3-M94 (1994). Elastic analysis is performed using both two-dimensional and three-dimensional shell element models for lateral loading with and without the effects of torsion. Element design specifications are used to create moment curvature envelopes to describe the members (beam and wall) deformation characteristics. These characteristics are incorporated into the nonlinear pushover analysis and dynamic inelastic time history analysis. The level of protection investigation illustrates that the coupled and noncoupled shear wall systems exhibit excellent performance following excitations of two and three times the design level earthquake. Maximum interstorey drift and element damage levels are within the acceptable limits for life-safe performance.Key words: seismic, reinforced concrete, shear walls, coupling beams, performance, inelastic, dynamic, design.

scholarly journals Influence of Opening Locations on the Structural Response of Shear Wall

2014 ◽  
Vol 2014 ◽  
pp. 1-18
Author(s):  
G. Muthukumar ◽  
Manoj Kumar
Keyword(s):  
Structural Response ◽  
Time History ◽  
Shear Walls ◽  
Shell Element ◽  
Shear Wall ◽  
Nonlinear Finite Element ◽  
Functional Requirement ◽  
Element Analysis ◽  
Assumed Strain ◽  
Degenerated Shell Element

Shear walls have been conferred as a major lateral load resisting element in a building in any seismic prone zone. It is essential to determine behavior of shear wall in the preelastic and postelastic stage. Shear walls may be provided with openings due to functional requirement of the building. The size and location of opening may play a significant role in the response of shear walls. Though it is a well known fact that size of openings affects the structural response of shear walls significantly, there is no clear consensus on the behavior of shear walls under different opening locations. The present study aims to study the dynamic behavior of shear walls under various opening locations using nonlinear finite element analysis using degenerated shell element with assumed strain approach. Only material nonlinearity has been considered using plasticity approach. A five-parameter Willam-Warnke failure criterion is considered to define the yielding/crushing of the concrete with tensile cutoff. The time history responses have been plotted for all opening cases with and without ductile detailing. The analysis has been done for different damping ratios. It has been observed that the large number of small openings resulted in better displacement response.

scholarly journals Global Retrofitting Strategies for an Existing Three-storied RC School Building in Mandalay, Myanmar

2020 ◽  
Vol 37 (2) ◽  
Author(s):  
Thiri Thwe ◽  
Nang Su Le′ Mya Thwin ◽  
Ne Min Hein
Keyword(s):  
Reinforced Concrete ◽  
Steel Plate ◽  
Pushover Analysis ◽  
Shear Walls ◽  
Earthquake Hazard ◽  
Vulnerability Index ◽  
Seismic Zone ◽  
Index Method ◽  
Steel Plate Shear Walls ◽  
Existing Building

Low to severe earthquakes occur around the world every year, damaging and causing structural failure in buildings. Consequently, seismic improvements are required for existing buildings that are vulnerable to damage by seismic forces. The objective of this study was to investigate retrofitting strategies in terms of their sustainability. Mandalay, Myanmar, was selected as the study area as it is located near the Sagaing fault, which itself is in a strong earthquake zone (seismic zone 4). A three-storied RC building with a non-seismic design was selected as a case study building. An investigation was carried out into the performance and vulnerability of the building under three earthquake hazard levels. The vulnerability index value was calculated using the Priority Index method. Meanwhile, non-linear static pushover analysis was performed to investigate the performance of the existing building using SAP2000 V14 software. Four different types of retrofitting strategies were considered, namely reinforced concrete shear walls with openings, reinforced concrete shear walls without openings, steel plate shear walls, and finally steel bracing. Among these, it was found that the use of steel plate shear walls was the best retrofitting technique, owing to it having the best performance along with the lowest displacement. Its performance level reached up to the Immediate Occupancy (IO) level even under the conditions of a Maximum Consider Earthquake (MCE).

Inelastic analysis of a reinforced concrete shear wall building according to the National Building Code of Canada 2005

2006 ◽  
Vol 33 (7) ◽  
pp. 854-871 ◽  
Author(s):  
M Panneton ◽  
P Léger ◽  
R Tremblay
Keyword(s):  
Reinforced Concrete ◽  
Three Dimensional ◽  
Time History ◽  
Shear Walls ◽  
Shear Wall ◽  
Fundamental Period ◽  
Building Code ◽  
Base Shear ◽  
Inelastic Analysis ◽  
The Impact

An eight-storey reinforced concrete shear wall building located in Montréal and designed according to the 1995 National Building Code of Canada (NBCC) and the Canadian Standards Association standard CSA-A23.3-94 is studied to evaluate the impact of new requirements for inclusion in new editions of the NBCC and CSA-A23.3. Static and modal analyses were conducted according to the 2005 NBCC (draft 2003) and CSA-A23.3-04 (draft 4) procedures, and three-dimensional dynamic inelastic time history analysis was performed using three earthquake records. The building is braced by four flat shear walls and three cores. Various estimates of the fundamental period of vibration based on empirical expressions presented in the literature or structural models with different stiffness assumptions were examined. The analysis also permitted the study of the displacement and force demand on the lateral load resisting system. It was found that the base shear from the 2005 NBCC is 29% higher than the 1995 NBCC value when code empirical formulae are used for the fundamental period of vibration.Key words: building, shear wall, inelastic seismic response, NBCC, CSA-A23.3 design of concrete structures.

scholarly journals Shear Walls Induced RC Structures

2021 ◽  
Vol 12 (2) ◽  
pp. 1827-1834
Author(s):  
Kesava Rao B, Et. al.
Keyword(s):  
Dynamic Analysis ◽  
Response Spectrum ◽  
Pushover Analysis ◽  
Shear Walls ◽  
Shear Wall ◽  
Lateral Force ◽  
Wind Pressure ◽  
Earthquake Response ◽  
Rc Structures ◽  
Seismic Forces

In recent years, the construction of skyscrapers has been on the rise to overcome the shortage of land. These buildings are subject to an external lateral force, such as an earthquake and wind pressure. Pushover analysis (POA) has been broadly used in predicting the earthquake response of structures, and shear walls have been shown to be lateral drag elements. Therefore, in the present work, the effect of placing a shear wall on the periphery symmetrically, the periphery asymmetrically and in the center of the building is performed using the ETABS software. Using the response spectrum methodand thetime history method, a dynamic analysis is performed. Responses such as floor shear, floor displacement, and lateral floor shifts due to seismic forces are evaluated for various locations of the shear wall. According to the results and analysis, the shear wall on the symmetrical periphery of the structure is reducing the displacement and deviation of the floor compared to other cases.

Study of the Seismic Performance of Composite Shear Walls with Embedded Steel Truss For Use in High-rise Buildings

Bauingenieur ◽  
2020 ◽  
Vol 95 (11) ◽  
pp. S 12-S 21
Author(s):  
Rudolf Heuer ◽  
Andreas Kolbisch ◽  
Ali Khazei
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Seismic Performance ◽  
Time History ◽  
Shear Walls ◽  
Shear Wall ◽  
Time History Analysis ◽  
Braced Frames ◽  
History Analysis ◽  
Composite Wall

Abstract The composite wall with encased steel braces (ESB wall) is a novel type of steel–concrete composite wall that consists of a steel braced frame embedded in reinforced concrete. This arrangement is supposed to enhance the seismic performance of the wall, as the steel columns encased in the boundary elements can increase the flexural strength of the wall and the steel braces encased in the web can increase the shear strength. ESB walls have seen use in super tall building structures constructed in regions of high seismicity. The ESB walls are commonly used on stories where the shear force demand is very high. Currently, no design guidelines exist for the design of ESB Walls in the Eurocode. More research is required before a distinct set of guidelines can be prescribed for the design of ESB Walls. The present research will investigate behavior of composite walls with encased steel braces (ESB walls). Time history analysis will be performed to examine the shear strength and stiffness of the ESB walls. In this study, two frames with three floors and five floors will be modeled in ABAQUS software. Then the X- shaped braces and inverted V brace is added to frames. Later, reinforced concrete shear wall will be added to braced frames, so the steel braces encased in the reinforced concrete shear wall. Time history analysis, on the braced frames will be done Compare and note with each other. The results of the study are in good agreement with those of previous studies. However, none of these studies examined the effect of using V- and X-shaped struts and shear walls simultaneously, nor did they examine which struts reinforce the structures more strongly against earthquake vibrations. This has led the study to examine the effect of these reinforcements under various earthquakes. In future studies, reinforced concrete structures can also be used in addition to steel structures, and the results can be compared. In addition, these braces can also be used in other parts of the building. To meet this objective, one can use the very important data provided in this thesis, and ultimately better and more accurate results can be extracted using this approach. The main aim of this thesis is to study the effect of increasing the number of floors on how to extend the stress on the building structure. To this end, the number of floors increased from three to five. Therefore, it can be concluded that an increase in the number of floors also more than 5 storey causes stress values, but these modes are quite consistent with the three- and five-storey buildings.

scholarly journals Response of a reinforced concrete shear wall structure during the 1972 Managua earthquake

1974 ◽  
Vol 7 (3) ◽  
pp. 95-104
Author(s):  
V. V. Bertero ◽  
S. A. Mahin ◽  
J. Hollings
Keyword(s):  
Reinforced Concrete ◽  
Structural Damage ◽  
Flexible Structures ◽  
Shear Walls ◽  
Shear Wall ◽  
Lateral Force ◽  
Wall Structure ◽  
Nonlinear Analyses ◽  
Observed Damage ◽  
Code Type

The 1972 Managua, Nicaragua earthquake was a severe test of modern earthquake resistant design and construction procedures. This paper examines the behaviour of the 18-story reinforced concrete Banco de America building which performed exceptionally well during the earthquake. Although the building suffered some structural and non-structural damage, its large, symmetrically located, coupled shear walls limited this damage to levels significantly below those observed in
more flexible structures. Several linear elastic and nonlinear analyses were conducted to evaluate the building's behaviour and determine the probable cause of the observed damage. Both static and dynamic elastic analyses were used to determine the members that would have failed and the consequence of these failures on the subsequent dynamic response. The effects of biaxial ground motions, foundation flexibility and ground motion characteristics were considered in the elastic investigations. To get a better idea of the dynamic behaviour of the principal lateral force resisting system considered in the design, nonlinear analyses were performed for the coupled shear wall cores as constructed and for the idealized case where the coupling girders were assumed to have unlimited ductility. Even code type static analyses satisfactorily identified the damaged regions. The principal design deficiency was the low shear strength of the coupling girders. However, the nonlinear results indicated that had these girders been able to develop their flexural capacity they would have suffered substantial numbers of reversals and the shear walls would have been subjected to undesirable states of stress. The analytical results as well as the building’s performance demonstrated that buildings with coupled shear walls combined with moment resisting frames offer excellent protection against seismic excitations, minimizing nonstructural damage while providing several lines of defense in the event of localized failure. Design and repair recommendations are offered.

Effect of configuration of shear walls at story plan to seismic behavior of high-rise reinforced concrete buildings

2020 ◽  
Vol 6 (1) ◽  
pp. 31
Author(s):  
Mustafa Tolga Çöğürcü ◽  
Mehmet Uzun
Keyword(s):  
Reinforced Concrete ◽  
Time History ◽  
Shear Walls ◽  
Horizontal Displacement ◽  
Shear Wall ◽  
Building Model ◽  
High Rise ◽  
History Analysis ◽  
Earthquake Load ◽  
Load Mode

In developing countries, the need for shelter, working area, shopping and entertainment centers is increasing due to the increasing population effect. In order to meet this need, it is necessary to turn to high-rise buildings. Significant damages have been observed as a result of insufficient horizontal displacement stiffness of high-rise buildings in major earthquakes in previous years. It is known that as the height of the structure increases, the displacement demand of the structure also increases. Since it is accepted that the structure will make inelastic deformation in the design of the structure, these displacements increase to very high levels as the number of stories increases. For this reason, damages can be much higher than expected. In order to limit the level of damage that may occur in high-rise buildings, the horizontal displacement of buildings is limited in many regulations in our age. This limitation is possible by increasing the rigidity of the structures against horizontal displacement. In recent years, the use of shear wall has increased due to the horizontal displacement limitation in the regulations. The use of shear walls in buildings limits the horizontal displacement. However, the choice of where the shear walls will be placed on the plan is very important. Failure to place the shear walls correctly may result in additional loads in the structure. It can also lead to torsional irregularity. In this study, a 10-storey reinforced concrete building model was created. Shear wall at the rate of 1% of the plan area of the building was used in the building. The shear walls are arranged in different geometric shapes and different layouts. The earthquake analysis of 5 different models were performed. Equivalent Earthquake Load, Mode Superposition and Time History Analysis methods were used for earthquake analysis. The results were compared and a proposal was made for the geometry and configuration of the shear wall.

Study on Seismic Behavior of the L-Shape Steel Reinforced Concrete Short-Pier Shear Wall with Different Concrete Strength

2013 ◽  
Vol 353-356 ◽  
pp. 1990-1999
Author(s):  
Yi Sheng Su ◽  
Er Cong Meng ◽  
Zu Lin Xiao ◽  
Yun Dong Pi ◽  
Yi Bin Yang
Keyword(s):  
Numerical Simulation ◽  
Reinforced Concrete ◽  
Seismic Performance ◽  
Seismic Behavior ◽  
Concrete Strength ◽  
Shear Walls ◽  
Shear Wall ◽  
Simulation Software ◽  
Steel Reinforced Concrete ◽  
Shrinkage Effect

In order to discuss the effect of different concrete strength on the seismic behavior of the L-shape steel reinforced concrete (SRC) short-pier shear wall , this article analyze three L-shape steel reinforced concrete short-pier shear walls of different concrete strength with the numerical simulation software ABAQUS, revealing the effects of concrete strength on the walls seismic behavior. The results of the study show that the concrete strength obviously influence the seismic performance. With the concrete strength grade rise, the bearing capacity of the shear wall becomes large, the ductility becomes low, the pinch shrinkage effect of the hysteresis loop becomes more obvious.

Sign in / Sign up

Export Citation Format

Share Document