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.

The Influence of Structural Damage on the Vibration Characteristics of Shear-Wall Buildings

2012 ◽  
Vol 193-194 ◽  
pp. 1216-1220 ◽  
Author(s):  
Kai Huang ◽  
Li Hua Zou ◽  
Jian Mei Chen
Keyword(s):  
Plastic Zone ◽  
Structural Damage ◽  
Pushover Analysis ◽  
Shear Walls ◽  
Shear Wall ◽  
Internal Force ◽  
Vibration Characteristics ◽  
Wall Structure ◽  
Wall Structures ◽  
The Continuum

To understand the higher modal effect on the accuracy of pushover analysis for shear wall structure, the influence of damage on the vibration characteristics of shear-wall structures is investigated. Employing the continuum technique, the shift of modal shapes and periods for the first three modes is obtained when the plastic zone exists in the bottom of the shear wall. It can be conclude that plastic zone may enhance the higher modal effect when the internal force responses of shear walls are considered. The higher modal contribution can not be neglected when computing the nonlinear earthquake responses of shear wall structures.

Performance of reinforced concrete buildings during the 27 February 2010 Maule (Chile) earthquake

2013 ◽  
Vol 40 (8) ◽  
pp. 693-710 ◽  
Author(s):  
Murat Saatcioglu ◽  
Dan Palermo ◽  
Ahmed Ghobarah ◽  
Denis Mitchell ◽  
Rob Simpson ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Structural Damage ◽  
Vertical Wall ◽  
Shear Walls ◽  
Poor Performance ◽  
Reinforced Concrete Buildings ◽  
Concrete Buildings ◽  
Concrete Frame ◽  
Maule Earthquake ◽  
Observed Damage

The paper presents observed damage in reinforced concrete buildings during the 27 February 2010 Maule earthquake in Chile. Performance of concrete frame and shear wall buildings are discussed with emphasis on seismic deficiencies in design and construction practices. It is shown that the majority of structural damage in multistorey and high-rise buildings can be attributed to poor performance of slender shear walls, without confined boundary elements, suffering from crushing of concrete and buckling of vertical wall reinforcement. Use of irregular buildings, lack of seismic detailing, and the interference of nonstructural elements were commonly observed seismic deficiencies. A comparison is made between Chilean and Canadian design practices with references made to the applicable code clauses. Lessons are drawn from the observed structural performance.

Verification of Adjustment Method of Design Seismic Shear Force of the Frame in RC Frame-Shear Wall Structure

2010 ◽  
Vol 163-167 ◽  
pp. 1736-1743
Author(s):  
Jun Han ◽  
Ying Min Li ◽  
Wei Xian Chen ◽  
Wei Jiang ◽  
Wei Zhao
Keyword(s):  
Shear Force ◽  
Shear Walls ◽  
Shear Wall ◽  
Lateral Force ◽  
Internal Force ◽  
Wall Structure ◽  
Analysis Model ◽  
Reinforced Concrete Frame ◽  
Force System ◽  
Earthquake Force

Reinforced concrete frame-shear wall structure is a double resistance to lateral force system, in which the frames and shear walls work cooperatively and the distributive rule of the earthquake force varies with different earthquake actions. To ensure the frames bear the increasing earthquake shear force and play a role of second defense line due to the internal force re-distribution after the stiffness degradation of shear walls, the elastic design earthquake shear force of the frames should be adjusted. However the adjustment measures applied in Chinese code are proposed according to the design experiences of engineers and lack of the theoretical and computational analytical basis. Moreover, there is a dispute about ignoring the rule of the shear force redistribution along storey or not, it is necessary to further evaluate the rationality of the measures in the code. In this paper, based on a 3-D precise nonlinear frame-shear wall structure analysis model, the re-distributive rule of the internal force under strong earthquake was studied and the adjustment measures of earthquake force in the frames were checked. Finally, some design suggestions were proposed.

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 Experimental Study on the Safety Assessment of Reinforced Concrete Shear Wall Structure with the Correspondence between Damage Image and Index

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Suxia Kou ◽  
Jianmin Zhang ◽  
Jing Ren
Keyword(s):  
Structural Damage ◽  
Safety Assessment ◽  
Failure Modes ◽  
Damage Identification ◽  
Damage Index ◽  
Shear Walls ◽  
Shear Wall ◽  
Design Parameters ◽  
Wall Structure ◽  
Loading Test

The post-disaster emergency rescue and loss evaluation hinges on the timeliness and accuracy of safety assessment of building structures in quake-hit regions. At present, the damage identification of quake-hit buildings in China is mainly conducted based on the experience of the experts. Such an assessment method will inevitably lead to the differences in identification results because each expert has his/her own subjective understanding of the degree of structural damage. In order to solve this problem, the low cyclic loading test of 7 specimens of shear wall is conducted and the hysteretic curves of seven shear walls are drawn. The failure modes and seismic performance of members under different design parameters (axial compression ratio of shear wall, shear span ratio, form of edge member, reinforcement ratio, stirrup ratio of coupling beam, and span height ratio) are compared. By recording the damage images taken at the controlled displacement under each level of load, the corresponding damage indexes are calculated, and the correspondence between the typical component damages and the damage indexes is discovered. After that, the images are compiled into an atlas. The authors calculate the damage index of the overall structure based on the damage indexes of the components and carries out damage identification of RC shear wall structure with the said damage index.

scholarly journals EVALUASI PERBANDINGAN SIMPANGAN STRUKTUR SRPM AKIBAT PERMODELAN STRUKTUR YANG BERBEDA

2018 ◽  
Vol 4 (1) ◽  
Author(s):  
Tondi Amirsyah Putera ◽  
Ade Faisal ◽  
Suprayetno .
Keyword(s):  
Line Element ◽  
System Modeling ◽  
Level Structure ◽  
Shear Walls ◽  
Element Model ◽  
Shear Wall ◽  
Lateral Force ◽  
Dimensional Structure ◽  
Wall Structure ◽  
Solid Element

Struktur bangunan bertingkat rawan terhadap gaya lateral, terutama akibat gaya yang ditimbulkan oleh gempa. Indonesia juga termasuk ke dalam wilayah yang memiliki instensitas terjadi gempa yang tinggi. Dalam menghitung struktur bangunan bertingkat ada 2 cara, yakni dengan sistem rangka pemikul momen (SRPM) dan kombinasi SRPM dengan shear wall. Pada proses perencanaan umumnya dinding geser dimodelkan sebagai element solid pada program komputer. Pemakaian element solid ini akan memakan waktu analisa seiring dengan semakin bertambahnya tinggi bangunan. Dinding geser juga dapat dimodelkan dengan element garis (line). Untuk itu studi ini bertujuan membandingkan hasil yang diperoleh bila dinding geser dimodelkan sebagai element solid dan element garis. Pada studi ini terdapat 3 pemodelan struktur, yaitu 1 model strktur tanpa dinding geser, dan 2 model truktur dengan dinding geser (model dinding geser solid element dan model dinding geser  line element). Semua input beban, tingkat kekakuan dan dimensi struktur adalah sama, yang berbeda hanyalah model shear wall yang digunakan. Gedung ini memiliki tingggi 40 meter (10 lantai), tinggi tiap lantai 4 meter. Berdasarkan hasil analisis tersebut diperoleh bahwa terjadi perbedaan perioda getar, simpangan, gaya geser dasar dan gaya-gaya dalam karena pemodelan sistem struktur penahan gaya geser yang berbeda-beda.  Kata Kunci : Dinding Geser, Pemodelan Struktur, Simpangan   ABSTRACT The structure of multi-storey buildings are vulnerable to lateral force, especially due to the force created by the earthquake. Indonesia is also included in the territory which has instensitas an earthquake is high. In calculating the structure of multi-storey buildings there are two ways, namely as moment resisting frame system (MRF) and combination of MRF with shear wall. The development of science and technology has given rise to one of the solutions to improve the performance of high-level structure, namely the installation of shear walls to add structural rigidity and absorbs shear forces along with the high structure. The goal of this studi is to determine the difference of some parameters made of a combination of structural design of the building with MRF and MRF with shear wall. In this study, there are 3 modeling of structures, namely 1 models structure without shear walls, and two models of structures are at the shear wall (solid element model of shear walls and shear wall model line element). All input load, stiffness and dimensional structure is the same, just different shear wall models used. This building has 40 meters (10 floors) of height, which is the height of each floor 4 meters. The results of the analysis indicates that the significant deviation occurs due to system modeling of shear wall is different. Keywords: Shear Wall, Structure Modelling, Displacement

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.

Study on the shear wall structure with combined form of replaceable devices

2017 ◽  
Vol 21 (9) ◽  
pp. 1327-1348
Author(s):  
Cong Chen ◽  
Renjie Xiao ◽  
Xilin Lu ◽  
Yun Chen
Keyword(s):  
Shear Walls ◽  
Shear Wall ◽  
Performance Comparison ◽  
Wall Structure ◽  
Structural Part ◽  
Coupled Shear Wall ◽  
Wall Structures ◽  
Strength And Stiffness ◽  
Energy Dissipated ◽  
Resilient Structure

Structure with replaceable devices is a type of earthquake resilient structure developed to restore the structure immediately after strong earthquakes. Current researches focus on one type of the replaceable device located in the structural part that is most likely to be damaged; however, plastic deformation would not be limited in a specific part but expand to other parts. To concentrate possible damage in shear wall structures, combined form of replaceable devices was introduced in this article. Based on previous studies, combined form of replaceable coupling beam and replaceable wall foot was used in a coupled shear wall. Influences of the dimension and location of the replaceable devices to the strength and stiffness of the shear wall were investigated through numerical modeling, which was verified by experimental data. Performance comparison between the shear walls with one type and combined form of replaceable devices and the conventional coupled shear wall was performed. In general, the shear wall with combined form of replaceable devices is shown to be better energy dissipated, and proper dimensions and locations of the replaceable devices should be determined.

scholarly journals The shear strength of shear walls

1970 ◽  
Vol 3 (4) ◽  
pp. 148-162
Author(s):  
T. Paulay
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Concrete Beams ◽  
Shear Walls ◽  
Shear Wall ◽  
Reinforced Concrete Beams ◽  
Research Projects ◽  
Deep Beams ◽  
Current Recommendation ◽  
The University

To enable a comparison between the shear strength of shear walls and that of reinforced concrete beams to be made, the behaviour of the latter is briefly reviewed. The findings of research projects, related to deep beams and the effects of repeated cyclic loading, are summarised. More detailed information on the shear strength of deep beams, tested at the University of Canterbury, is presented, Particular problems associated with four classes of typical shear walls of multi-storey structures are briefly highlighted. The current recommendation of the
 SEAOC code, as applied to shear walls, are critically examined and certain
anomalies, which may ensue from their interpretation, are illustrated. Areas of research, related to the full evaluation of reinforced concrete shear wall
 behaviour, are suggested. The paper concludes with a number of design recommendations which suggest themselves from this review.

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