Effect of Hold-Down Misplacement on Strength and Stiffness of Wood Shear Walls

2005 ◽  
Vol 10 (2) ◽  
pp. 79-87 ◽  
Author(s):  
Daňa J. Lebeda ◽  
Rakesh Gupta ◽  
David V. Rosowsky ◽  
J. Daniel Dolan
Keyword(s):  
Shear Walls ◽  
Strength And Stiffness

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 Experimental and Analytical Study on Seismic Behavior of Strengthened Existing Single Frame Structures with Exterior Cantilevers

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Bo Hu ◽  
Xinyu Wei ◽  
Henglin Lv ◽  
Tribikram Kundu ◽  
Ning Li
Keyword(s):  
Shear Walls ◽  
Shear Wall ◽  
Hysteretic Behavior ◽  
Frame Structures ◽  
Structural Redundancy ◽  
Skeleton Curve ◽  
Rc Frames ◽  
Weak Beam ◽  
Single Frame ◽  
Strength And Stiffness

Three single reinforcement concrete (RC) frames, including 1 reference specimen and 2 specimens strengthened with shear walls, were fabricated and subjected to low cyclic loadings, in order to evaluate seismic performances of strengthened single frame structures with exterior cantilevers. Through comparison and analysis of failure mode, hysteretic behavior, skeleton curve, energy dissipation, strength, and stiffness degradation of the tested frames, the validity of the shear wall-based reinforcement method for single frames was verified. Test results indicate that the stiffness and load-bearing capacities of strengthened frames increased considerably in comparison with the reference frame. A “strong column-weak beam” failure pattern was observed on the cantilever side, and the failure of the shear wall was always prior to the column, which can increase the structural redundancy and improve the failure mechanism and seismic performance of an existing single frame.

scholarly journals In-Plane Strength and Stiffness of Cross-Laminated Timber Shear Walls

Buildings ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 100 ◽  
Author(s):  
Md Shahnewaz ◽  
Shahria Alam ◽  
Thomas Tannert
Keyword(s):  
Energy Dissipation ◽  
Peak Load ◽  
Shear Walls ◽  
Experimental Tests ◽  
Shear Loading ◽  
Peak Displacement ◽  
Cross Laminated Timber ◽  
Type Construction ◽  
Strength And Stiffness ◽  
Single Shear

The research presented herein investigated the in-plane performance of cross-laminated timber (CLT) shear walls for platform-type buildings under lateral loading. Finite element models of CLT connections (i.e., brackets, hold-downs and self-tapping screws) were developed in OpenSees and calibrated against experimental tests to represent the connections’ hysteresis behaviour under cyclic tension and shear loading. The results were incorporated into models of CLT single and coupled shear walls. The results in terms of peak displacement, peak load and energy dissipation were in good agreement when compared to full-scale shear wall tests. Subsequently, a parametric study of 56 single and 40 coupled CLT shear walls was conducted with varying numbers and types of connectors (wall-to-floor and wall-to-wall) for evaluating their seismic performance. It was found that the strength, stiffness and energy dissipation of the single and coupled CLT shear walls increased with an increase in the number of connectors. Single shear walls with hold-downs and brackets performed better under seismic loading compared to walls with brackets only. Similarly, coupled shear walls with four hold-downs performed better compared to walls with two hold-downs. Finally, ductility of coupled shear walls was found to be 31% higher compared to that of single shear walls. The findings from this research are useful for engineers to efficiently design CLT shear walls in platform-type construction.

Experimental characterization of quick mechanical connecting systems for cold-formed steel structures

2016 ◽  
Vol 20 (7) ◽  
pp. 1098-1110 ◽  
Author(s):  
Luigi Fiorino ◽  
Vincenzo Macillo ◽  
Raffaele Landolfo
Keyword(s):  
Shear Walls ◽  
Steel Structures ◽  
Structural Behaviour ◽  
Modular Systems ◽  
Cyclic Shear ◽  
Steel Connections ◽  
Modular Units ◽  
Cold Formed Steel ◽  
Strength And Stiffness ◽  
Reliable Solution

Among the several available building systems, constructions involving cold-formed steel profiles represent an efficient and reliable solution. These systems are very suitable to be used in pre-fabricated modular constructions, thanks to their lightness and possibility to automate the building process. In these systems, connections are usually made with self-tapping screws and play a key role both in fabrication, for reducing assembling times of modular units, and in structural behaviour, particularly for sheathing-braced solutions. In a framework of the European project ELISSA (Energy Efficient LIghtweight-Sustainable-SAfe-Steel Construction), which was devoted to the development and demonstration of cold-formed steel modular systems, an experimental campaign on quick connecting systems alternative to screws was carried out. This article shows the results of this experimental activity, consisting of monotonic and cyclic shear tests on connection systems. In particular, the tested specimens are clinching for steel-to-steel connections, whereas the fasteners used for panel-to-steel connections of walls and floors are ballistic nails. Tests results provided important information on the shear response of the connections with particular reference to the values of strength and stiffness, which are the main parameters for developing the seismic design of sheathed shear walls.

scholarly journals The study of shear wall uses in buildings during the architecture design process

2021 ◽  
Vol 907 (1) ◽  
pp. 012002
Author(s):  
Livian Teddy ◽  
Husnul Hidayat ◽  
Dessa Andriyali A
Keyword(s):  
Design Process ◽  
Shear Walls ◽  
Architecture Design ◽  
Optimal Position ◽  
Building Models ◽  
Earthquake Resistant ◽  
Prone Area ◽  
Strength And Stiffness ◽  
Optimal Area ◽  
Matlab Programming

Abstract In Indonesia, an earthquake-prone area, building designs must be earthquake resistant, and using shear walls is one of the ways to make buildings more earthquake resistant. However, determining the requirements and optimal position of shear walls is difficult. Miscalculating in their positioning can cause torsion and other unpredictable behavior. Previous studies were done to know shear walls’ optimal areas and positioning. The first way was trial and error, but this method was ineffective and took a long time. The second way, MATLAB programming, is actually very effective since the needs and orientation of the walls can be determined precisely. Nevertheless, not all structural engineers and architects master the programming language. This study, therefore, proposes relatively simple formulas and procedures to determine the optimal area and positioning of shear walls for architects preliminary design during architecture design process. The accuracy test for the formulas and procedures was carried out using ETABS simulation experiments on 10 building models with various irregular categories. The result showed the formulas and procedures proposed in this study were quite accurate in calculating the needs and position of shear walls. Optimal conditions, furthermore, were quite easy to achieve in symmetrical geometric compositions (1 or 2 axes) while organic or random geometric compositions were quite difficult to achieve. When the use of shear walls achieves optimal condition, the strength and stiffness of a building are increased, and the distribution of its strength and stiffness is relatively even, hence anticipating deformation behavior and reducing building eccentricity.

scholarly journals Application Of The Distributed Plasticity Concept In Quick Nonlinear Analysis Of Reinforced Concrete Shear Walls

2015 ◽  
Vol 5 (1) ◽  
pp. 109-118
Author(s):  
F. S. Trifa ◽  
A. Cătărig
Keyword(s):  
Reinforced Concrete ◽  
Calculation Method ◽  
Poisson Ratio ◽  
Shear Walls ◽  
Calculation Model ◽  
Shear Deformations ◽  
Strength Capacity ◽  
Strength And Stiffness ◽  
Simplified Calculation ◽  
Experimental Researches

Abstract The paper presents a simplified calculation method to predict, as accurate as possible, the most important characteristics of the behaviour of the slender reinforced concrete shear walls in the inelastic range: failure mode, strength capacity, flexural and shear deformations, sectional and element ductility. The formulation is based on nonlinear beam element with taking into account the influence of shear, both on strength and stiffness of the wall. The principal parameters incorporated in the calculation model are: the rectangular shape of the cross section, the aspect ratio of the wall, the most accurate constitutive relationships for the compressed concrete and for the reinforcement steel, both in compression and in tension (including the strengthening of the steel after yielding), the variation of the Poisson ratio of the concrete, the amount and distribution of the vertical reinforcement. The model uses the concept of distributed (smeared) plasticity along the element and so the flexural deformations are computed by integrating the actual curvatures on the height of the wall. The shear deformations are also calculated, in agreement with the results of some recent experimental researches. The calculation method was then applied to two experimental wall specimens and their force – horizontal top displacement curves were plotted.

scholarly journals Investigating the behavior of boundary elements in steel shear walls with different connections

2021 ◽  
Vol 30 (4) ◽  
Author(s):  
Bi Ying
Keyword(s):  
Energy Dissipation ◽  
Shear Walls ◽  
High Strength ◽  
Shear Wall ◽  
High Ductility ◽  
Steel Shear Wall ◽  
Different Types ◽  
Energy Dissipation Capacity ◽  
Strength And Stiffness ◽  
Free Beam

In the recent five decades, steel shear walls have been one of the most important systems in the construction and rehabilitation of many structures. The system has many advantages including high strength and stiffness, high ductility and excellent energy dissipation capacity. Steel shear walls are made and executed in different types. These include walls with and without stiffeners as well as composites. Recent research shows that they are a type of steel shear wall in which the infill plate is slightly away from the boundary members. In fact, there is no connection between the infill plate and one of boundary members. Therefore, in this study, the behavior of traditional one-story-one-span steel shear walls with 4 different lengths was investigated. For comparison, walls in which the sheet was attached only to a beam or column were examined. Obtained results from the study showed that the lateral bearing capacity of samples with free beam or free column is less than that of samples with full connection, on average 20%. Also, the strength of the samples with free column is slightly higher than the samples with free beam. In addition, boundary members, especially columns, are much less affected by forces in free-column specimens than in other specimens, and this could decreases economical costs.

scholarly journals Seismic behaviour of post-tensioned concrete shear wall: a review

2021 ◽  
Vol 10 (1) ◽  
pp. 1-11
Author(s):  
Sneha Benoy ◽  
Asha Joseph
Keyword(s):  
Shear Walls ◽  
Shear Wall ◽  
Primary Objective ◽  
Critical Study ◽  
Seismic Behaviour ◽  
High Rise ◽  
Wall Construction ◽  
Strength And Stiffness ◽  
Integral Feature ◽  
Post Tensioned

Shear walls are specifically meant to withstand lateral forces exerted by either wind or earthquake loads on a structure. Due to their superior strength and stiffness, shear walls have been an integral feature of mid-rise and high- rise structures over the past two decades. Various studies have been performed in this field. Usage of post-tensioned tendons in the traditional shear wall is one of the major advancements in recent times so as to increase the stiffness and reduce the damage incurred by destructive earthquakes. The key advantage of post-tensioned shear walls is the potential to re-centre after a devastating earthquake which is lacking in conventional reinforced concrete (RC) shear walls that rely on yielding creating large deformations. Moreover, compared with conventional shear wall construction, post-tensioned shear walls can reduce the use of vertical mild steel reinforcement. This results in materials being used more effectively and eliminates congestion. This paper seeks to review and analyze the research studies based on post- tensioned shear wall focusing on works published within the last decade. Firstly, the benefits of using post-tensioned shear walls in seismically active areas are illustrated. The behaviour and parameters controlling the performance of post-tensioned shear walls are then studied. A critical study of the factors responsible for the performance of post- tensioned shear wall is the primary objective of this review. Keywords- Shear Wall, Post-Tensioning, Energy-Dissipation, Self-Centering

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