A Study on Retrofit Methods of Shear Walls with New Openings

2008 ◽  
Vol 385-387 ◽  
pp. 861-864
Author(s):  
Hyun Ki Choi ◽  
J.A. Lee ◽  
M.S. Lee ◽  
Yun Cheul Choi ◽  
Chang Sik Choi
Keyword(s):  
Cyclic Loading ◽  
Axial Stress ◽  
Shear Walls ◽  
Shear Wall ◽  
Seismic Retrofit ◽  
Test Results

A series of five shear wall specimens were tested under constant axial stress and reversed lateral cyclic loading in order to evaluate the seismic retrofit methods that had been proposed for shear walls with new openings. The test results showed that the failed specimens had shear fractures and two different retrofit methods had different effects on the strengths of each specimen.

Retrofit of Artificially Perforated Shear Wall in Existing Dominant Wall Structure

2007 ◽  
Vol 348-349 ◽  
pp. 917-920
Author(s):  
Chang Sik Choi ◽  
Yun Cheul Choi ◽  
Hyun Ki Choi ◽  
M.S. Lee
Keyword(s):  
Carbon Fiber ◽  
Axial Stress ◽  
Shear Wall ◽  
Seismic Retrofit ◽  
Lateral Loading ◽  
The Other ◽  
Steel Plates ◽  
Wall Structure ◽  
Test Results ◽  
Different Types

A series of three shear wall specimens were tested under constant axial stress and reversed cyclical lateral loading in order to evaluate the seismic retrofit that had been proposed for the shear wall with the opening induced by remodeling. One of these specimens was tested in the as-built condition and the other two were retrofitted prior to testing. The retrofit involved the use of carbon fiber sheets and steel plates (a thickness of 3mm) over the entire face of the wall. The test results showed that the failed specimens had shear fractures and that two different types of retrofitting strategies had different effects on the strengths of each specimen.

scholarly journals Connection of infill panels in steel plate shear walls

1999 ◽  
Vol 26 (5) ◽  
pp. 549-563 ◽  
Author(s):  
A Schumacher ◽  
G Y Grondin ◽  
G L Kulak
Keyword(s):  
Finite Element ◽  
Cyclic Loading ◽  
Steel Plate ◽  
Shear Walls ◽  
Element Model ◽  
Shear Wall ◽  
Experimental Program ◽  
Steel Plate Shear Wall ◽  
Infill Panels ◽  
Welded Connection

The behaviour under cyclic loading of unstiffened steel plate shear wall panels at their connection to the bounding beams and columns was investigated on full-size panel corner details. Four different infill panel connection details were tested to examine and compare their response to quasi-static cyclic loading. The load versus displacement response of the details showed gradual and stable deterioration at higher loads. The formation of tears in the connection details did not result in a loss of load-carrying capacity. In addition to the experimental program, a finite element model was developed to model the behaviour of one of the infill plate corner connection specimens. Results from the analysis showed that the finite element method can be used to obtain the load versus displacement behaviour of an infill panel-to-boundary member arrangement.Key words: cyclic loading, hysteresis, shear wall, steel, welded connection.

Seismic Performance of Precast Concrete Composite Shear Walls with Multiple Boundary Elements

2019 ◽  
Vol 13 (03n04) ◽  
pp. 1940006
Author(s):  
W. C. Xue ◽  
Y. Li ◽  
L. Cai ◽  
X. Hu
Keyword(s):  
Precast Concrete ◽  
Shear Walls ◽  
Boundary Elements ◽  
Shear Wall ◽  
Control Specimen ◽  
Test Results ◽  
Out Of Plane ◽  
Loading Tests ◽  
Composite Shear ◽  
Scale Shear

Compared with traditional precast concrete composite shear walls (PCCSWs) with two boundary elements adjacent to edges, the PCCSWs with multiple boundary elements investigated in this paper have extra boundary elements at the intersections with other shear walls. In this paper, low reversed cyclic loading tests were conducted on three full-scale shear wall specimens with multiple boundary elements under in-plane loading and two full-scale shear wall specimens under out-of-plane loading. The in-plane loaded specimens included a PCCSW with double precast layers (i.e. precast concrete double skin shear wall, PCDSSW), a PCCSW with single precast layer, and a cast-in-pace (CIP) control specimen, whereas the out-of-plane loaded specimens included a PCDSSW and a CIP control specimen. Test results revealed that all specimens failed in bending. The hysteresis loops of the precast composite specimens were stable but slightly pinching, which were similar to those of the corresponding CIP control specimen. Compared with the CIP specimens, the PCDSSWs showed similar energy dissipation. The loading capacity of the precast composite specimens was generally a little lower than that of the corresponding CIP specimen with difference not more than 15%. In the in-plane loading tests, the PCDSSW reached higher displacement ductility (2.45) than the CIP specimen (1.88), whereas the ductility of the PCCSW with single precast layer was relatively low. Regarding the specimens under out-of-plane loading, the ductility of the PCDSSW (3.83) was close to that of the CIP specimen (3.02). Moreover, the stiffness degradation of the precast composite specimens was found to be comparable to that of the control specimens. Based on the test results, a restoring force model was developed.

Stiffness and energy degradation of wood frame shear walls

1998 ◽  
Vol 25 (3) ◽  
pp. 412-423 ◽  
Author(s):  
Harry W Shenton III ◽  
David W Dinehart ◽  
Timothy E Elliott
Keyword(s):  
Energy Dissipation ◽  
Cyclic Loading ◽  
Oriented Strand Board ◽  
Test Procedure ◽  
Shear Walls ◽  
Shear Wall ◽  
Effective Stiffness ◽  
Seismic Shear ◽  
Wall Stiffness ◽  
Wood Frame

Tests have been conducted on wood frame shear walls to characterize the degradation of stiffness and energy dissipation that occurs under cyclic loading. A total of eight walls were tested, four sheathed in plywood and four sheathed in oriented-strand board. The tests were conducted in accordance with a draft test procedure recently proposed by the Structural Engineers Association of Southern California, which is based on a sequential phased displacement command input. The results indicate that effective stiffness decreases linearly with continued cycling at the same displacement and decreases with increasing amplitudes of displacement. Furthermore, the energy dissipation capacity of the wall decreases by 15-20% with the first cycle at a given amplitude, then decreases slightly with continued cycling at the same amplitude. The changes in effective stiffness and energy dissipation are generally independent of the type of sheathing for loads less than the wall ultimate, suggesting that the wall performance under cyclic loading is influenced more by the fastener and frame behavior. The results presented should be useful for design and for verifying hysteretic models of the shear wall behavior.Key words: cyclic, dynamic, energy dissipation, experimental, seismic, shear wall, stiffness, testing, timber, wood frame.

scholarly journals Experimental Study on Precast Concrete Shear Walls with Different Hollow Slabs

2014 ◽  
Vol 8 (1) ◽  
pp. 166-171 ◽  
Author(s):  
Qinyan Zhao ◽  
Zhongyong Zhang ◽  
Jiliang Liu ◽  
Mingjin Chu
Keyword(s):  
Experimental Study ◽  
Cyclic Loading ◽  
Failure Mode ◽  
Shear Failure ◽  
Precast Concrete ◽  
Shear Walls ◽  
Test Results ◽  
Mechanical Behaviors ◽  
Low Cyclic Loading

To study mechanical behaviors of shear walls built with precast two-way hollow slabs, two shear walls with different details of hollow slabs were quasi-statically tested under low cyclic loading. The failure mode was analyzed, which vertical macro-cracks appeared on walls due to the details of hollow slabs. Brittle shear failure can be avoided in terms of the failure behaviors evolved from integral wall to the combination of wall and columns. Test results also show that that dimension of transverse holes can affect compressive capacity of the walls when it is larger than that of longitudinal holes in the hollow slab.

Seismic performance of concrete walls reinforced by high-strength bars: cyclic loading test and numerical simulation

2021 ◽  
Author(s):  
Xiangyong Ni ◽  
Shuangyin Cao ◽  
Hassan Aoude
Keyword(s):  
Energy Dissipation ◽  
Cyclic Loading ◽  
Seismic Performance ◽  
Numerical Study ◽  
Shear Walls ◽  
High Strength ◽  
Test Results ◽  
3D Fem ◽  
Seismic Behaviour ◽  
Loading Test

This study examines the influence of cross-section shape on the seismic behaviour of high-strength steel reinforced concrete shear walls (HSS-RC) designed with Grade HRB 600 MPa reinforcement. As part of the study, two flexure-dominant walls with rectangular and T-shaped cross-sections, are tested under reversed cyclic loading. Seismic performance is evaluated by studying the failure characteristics, hysteretic curves, energy dissipation, ductility and reinforcing bar strains in the two walls. As part of the numerical study, two-dimensional (2D) and three-dimensional (3D) finite element modelling (FEM) are used to predict the seismic response of the rectangular and T-shaped walls, respectively. The test results show that compared to the rectangular wall, the flange in the T-shaped HSS-RC wall increased strength, energy dissipation and stiffness, but decreased ductility. The analytical hysteretic curves calculated using 2D and 3D FEM analyses show good agreement with the experimental test results.

Monotonic and Cyclic Tests of Round Bamboo Shear Walls

2012 ◽  
Vol 517 ◽  
pp. 135-140 ◽  
Author(s):  
Zhi Li ◽  
Yan Xiao ◽  
Bo Shan ◽  
Lei Li ◽  
Rui Wang
Keyword(s):  
Mechanical Properties ◽  
Cyclic Loading ◽  
Shear Walls ◽  
Loading Conditions ◽  
Test Results ◽  
Cyclic Tests ◽  
Lateral Resistance ◽  
Load Displacement

This paper reports the first step of a study to evaluate the lateral resistance capacity of Round bamboo shear walls and its mechanical properties under Monotonic and cyclic loading conditions. The bamboo shear walls are built with round bamboo as its stub and with ply-bamboo sheet as its sheathing. Load-displacement curves of six round bamboo shear walls, with three different connection types, were obtained in this experiment, and the test results showed that the lateral resistance capacity of round bamboo shear walls can exceed 4.0kN/m, satisfying the projects requirement. A combination of nail and panel failures were observed in the test.

scholarly journals Evaluation of Simplified Methods for Estimating Shear Capacity Using JNES/NUPEC Low-Rise Concrete Shear Wall Cyclic Test Data

2008 ◽  
Author(s):  
Jinsuo Nie ◽  
Joseph I. Braverman ◽  
Charles H. Hofmayer ◽  
Syed A. Ali
Keyword(s):  
Reinforced Concrete ◽  
Test Data ◽  
Shear Walls ◽  
Shear Wall ◽  
Interaction Effects ◽  
Shear Capacity ◽  
Single Element ◽  
Test Results ◽  
Adjustment Factor ◽  
Aspect Ratios

The simplified methods in current codes for determining the shear capacity of reinforced concrete shear walls had mostly been validated using the test results of single-element shear walls. Recently available JNES/NUPEC test data of reinforced concrete shear walls under multi-directional cyclic loadings provided a unique opportunity to investigate the adequacy of the simplified methods for use in situations with strong interaction effects. A total of 11 test specimens with aspect ratios between 0.47 and 0.87 have been used in the assessment. Two simplified methods from the ACI 349-01 standard [1] and one from the ASCE 43-05 standard [2] have been evaluated. This paper also presents the development of an adjustment factor to consider the aspect ratio and the development of two approaches to consider interaction effects for one of the simplified methods. It concludes with the insights on the applicability of the code methods when interaction effects exist.

Behavior of steel–concrete composite bolted connector in precast reinforced concrete shear wall

2019 ◽  
Vol 22 (12) ◽  
pp. 2572-2582 ◽  
Author(s):  
Hongbo Jiang ◽  
Hongxing Qiu ◽  
Jian Sun ◽  
Yuan Yang
Keyword(s):  
Failure Modes ◽  
Shear Failure ◽  
Concrete Strength ◽  
Shear Walls ◽  
Tensile Loading ◽  
Shear Wall ◽  
Bearing Failure ◽  
Test Results ◽  
Bolted Connection ◽  
Bolt Diameter

An assembling method of precast shear walls was previously proposed using steel–concrete composite bolted connectors. To further investigate the effectiveness and mechanical behavior of the proposed composite connector, 11 specimens were fabricated and tested under monotonic tensile loading. The test results provided comprehensive data (e.g. load, deformation, failure mode) on the effects of variation in the thickness of steel cap plate, concrete strength, bolt tension, and bolt diameter. Two typical failure modes were observed in the test: bearing failure and bolt shear failure. Finally, the equations for calculating the ultimate strength and yield strength of steel–concrete composite bolted connector are proposed in this article by reference to those of conventional bolted connection. The proposed calculations are demonstrated to be accurate enough through verification with the experimental data.

Cyclic Loading Response of Composite Corrugated Steel Plate Shear Walls - Smart Technic

2021 ◽  
Vol 14 (4) ◽  
pp. 131-145
Author(s):  
Nabaa Salah Hassan
Keyword(s):  
Cyclic Loading ◽  
Steel Plate ◽  
Shear Walls ◽  
Shear Wall ◽  
Structural Elements ◽  
Structural Element ◽  
Steel Plate Shear Walls ◽  
Composite Shear Wall ◽  
Steel Shear Wall ◽  
Composite Shear

The structural element within the whole structure contains structural elements like beams, slabs, columns and reinforced concrete walls. One of the most vertical structural elements is shear wall that built to giving stability to the building, resisting lateral force such as earthquake and wind and to reduce the building deformations.  In present study, the analysis of corrugated vertical steel plate shear walls using finite element method by ABAQUS software is examined. Four different modes are analysed in which the first model is vertical corrugated steel shear wall plate, second is the composite shear wall with full interaction, third is the composite shear wall and finally the fourth model is composite shear wall with gap between concrete panel and steel frame to check out the full performance of different shear wall under the effects of cyclic loadings. Displacement, drift and energy dissipation will investigate throughout analysis.  Analysis results indicated that the gap and composite action between steel and concrete panel play an important role on the performance of shear wall under cyclic loading. The decrease in displacement of composite shear wall as compared with the steel shear wall reach 11.86%.

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