Stiffening of Shear Walls

1974 ◽  
Vol 1 (1) ◽  
pp. 85-96
Author(s):  
Paul C. K. Chan ◽  
Arthur C. Heidebrecht
Keyword(s):  
Lateral Displacement ◽  
Shear Walls ◽  
Shear Wall ◽  
Simple Method ◽  
Flat Slab ◽  
Axial Forces ◽  
Overturning Moment ◽  
The Moment ◽  
Exact Computer ◽  
Method Show

In interacting shear wall and flat slab-column construction it is desirable to be able to evaluate the contribution of the columns to the stiffness of the lateral load resisting system. This paper presents a relatively simple method whereby this contribution can be determined, both in terms of the reduction in lateral displacement and the reduction in overturning moment in the shear walls. For the case of a continuous flat slab connection, the bending of the slab induces axial forces into the exterior columns, which therefore causes a portion of the moment to be carried by the columns. Axial forces can also be induced into the exterior columns by means of a very stiff top beam extending from the shear wall to the exterior columns. Design curves are presented for both types of stiffening so that the method can be applied easily by the designer. Comparisons of specific examples with results obtained by a more exact computer-oriented method show that the method gives reliable results.

scholarly journals Experimental Comparison Study on Cyclic Behavior of Coupled Shear Walls with Two-Level-Yielding Steel Coupling Beam and RC Coupling Beam

2018 ◽  
Author(s):  
Guoqiang LI ◽  
Mengde PANG ◽  
Feifei Sun ◽  
Liulian LI ◽  
Jianyun SUN
Keyword(s):  
Energy Dissipation ◽  
Lateral Displacement ◽  
Shear Walls ◽  
Shear Wall ◽  
Cyclic Behavior ◽  
Experimental Comparison ◽  
Coupling Beam ◽  
Coupling Beams ◽  
Coupled Shear Wall ◽  
Steel Coupling Beam

Coupled shear walls are widely used in high rise buildings, since they can not only provide efficient lateral stiffness but also behave outstanding energy dissipation ability especially for earthquake-resistance. Traditionally, the coupling beams are made of reinforced concrete, which are prone to shear failure due to low aspect ratio and greatly reduce the efficiency and ability of energy dissipation.  For overcoming the shortcoming of concrete reinforced coupling beams (RCB), an innovative steel coupling beams called two-level-yielding steel coupling beam (TYSCB) is invented to balance the demand of stiffness and energy dissipation for coupled shear walls. TYSCBs are made of two parallel steel beams with yielding at two different levels.  To verify and investigate the aseismic behaviour improvement of TYSCB-coupled shear walls, two 1/3 scale, 10-storey coupled shear wall specimens with TYSCB and RCB were tested under both gravity and lateral displacement reversals. These two specimens were designed with the same bearing capacity, thus to be easier to compare. The experimental TYSCB specimen demonstrated more robust cyclic performance. Both specimens reached 1% lateral drift, however, the TYSCB-coupled shear wall showed minimal strength degradation. Additionally, a larger amount of energy was dissipated during each test of the TYSCB specimen, compared with the RCB specimen. Based on the experimental results, design recommendations are provided.

scholarly journals Analisis Pengaruh Lokasi Dinding Geser Terhadap Pergeseran Lateral Bangunan Bertingkat Beton Bertulang 5 Lantai

2021 ◽  
Vol 4 (1) ◽  
pp. 16
Author(s):  
Leonardus Setia Budi Wibowo ◽  
Dermawan Zebua
Keyword(s):  
Lateral Displacement ◽  
Shear Walls ◽  
Seismic Loading ◽  
Shear Wall ◽  
Structural System ◽  
Earthquake Force ◽  
Earthquake Resistant ◽  
Story Drift ◽  
Frame System ◽  
Rc Shear Wall

Indonesia is one of the countries in the earthquake region. Therefore, it is necessary to build earthquake-resistant buildings to reduce the risk of material and life losses. Reinforced Concrete (RC) shear walls is one of effective structure element to resist earthquake forces. Applying RC shear wall can effectively reduce the displacement and story-drift of the structure. This research aims to study the effect of shear wall location in symmetric medium-rise building due to seismic loading. The symmetric medium rise-building is analyzed for earthquake force by considering two types of structural system. i.e. Frame system and Dual system. First model is open frame structural system and other three models are dual type structural system. The frame with shear walls at core and centrally placed at exterior frames showed significant reduction more than 80% lateral displacement at the top of structure.

Analysis of Effective Location of Shear Wall for High Rise Building with U – Configuration

2021 ◽  
Vol 23 (2) ◽  
pp. 167-176
Author(s):  
Sekar Mentari ◽  
Rosi Nursani
Keyword(s):  
Lateral Displacement ◽  
Center Of Mass ◽  
Shear Walls ◽  
Shear Wall ◽  
Rotational Axis ◽  
Moment Frame ◽  
Earthquake Loads ◽  
High Rise ◽  
Live Loads ◽  
Special Moment Frame

Indonesia is one of the countries that is prone to earthquakes. In addition to the dead loads, superimposed dead loads, and live loads, the design of buildings in Indonesia must be concerned with earthquake loads. Installing shear walls in the building structure as the Special Moment Frame Dual System is one of a solution to withstand earthquake loads. However, the location of shear walls must be considered, especially in buildings with horizontal irregularities. This study aims to determine the optimum location of the shear walls in a 10-storey building that has U-configuration with dynamic earthquake loads. This research is a numerical simulation ran by modelling the structure with software. To know the effect of the shear wall’s location on a building, several variations of the shear wall configuration with different positions have been conducted. It can be seen the lateral displacement of each floor and the shear force are the response structure to withstand the dynamic earthquake loads. Shear walls that are located close to the center of mass of the building are the optimum variation because the position of the shear wall is the closest to the core area of the building, which is the rotational axis of the building.

scholarly journals COMPUTATIONAL ASSESSMENT FOR SEISMOLOGICAL PERFORMANCE OF MULTISTOREY FLAT SLAB STRUCTURES WITH (AT SPECIFIC POSITIONS) AND WITHOUT SHEAR WALLS

2021 ◽  
Vol 6 (3) ◽  
Author(s):  
Shaikh Jafar Shaikh Ismail ◽  
L. G. Patil
Keyword(s):  
Shear Walls ◽  
Shear Wall ◽  
Lateral Stiffness ◽  
Lateral Loads ◽  
Dead Load ◽  
Flat Slab ◽  
Variable Parameters ◽  
High Rise ◽  
Main Factors ◽  
Seismic Investigation

In present era, there is a huge scarcity of vacant land led to the development of the high rise structures. For the construction of high rise buildings, normal R.C.C. system is not suitable. These problems can overcome by using flat slab system along with shear wall arrangements. It is very essential that the shear wall position should be appropriate in structure so as to achieve the lateral stiffness and solid structure against lateral loads. In this work, two main factors i.e. with drop panels and without drop panels have been considered for 12 storey structures. In each factor 5 models of various locations of shear wall is taken for consideration. For stabilization of variable parameters such as storey displacement, storey stiffness and storey shear etc the seismic investigation & design of structures had carried out in software ETABS. After performing seismic investigation & design of all the structures, result shows that if we provide shear wall at incorrect or inappropriate locations then it will only increase the dead load and cost of the structure. So the final outcomes we have achieved is to provide shear walls at desired position where lateral loads are more predominantly acting on the structures

scholarly journals Seismic Performance of Flat Slab in Tall Buildings with and without Shear wall

2019 ◽  
Vol 9 (1) ◽  
pp. 2672-2675 ◽  
Keyword(s):  
Seismic Performance ◽  
Lateral Displacement ◽  
Tall Buildings ◽  
Shear Wall ◽  
Lateral Force ◽  
Modern Trend ◽  
Base Shear ◽  
Flat Slab ◽  
Industrial Buildings ◽  
Time Period

Tall buildings structure has been a considerable increase in both residential and commercial as well as modern Trend structures. There are two systems comprise the most attractive and commonly used now a days are flat slab and shear wall system. Flat slab is most widely used system in reinforced concrete construction in offices, industrial buildings etc. It supports floor slab without beams. When it comes to seismic performance or lateral force flat slab tall buildings without shear wall is relatively less when compared to with shearwall.in this study I have done two models of flats slab tall buildings one with shear wall and another one without shear wall by using ETABS software. The comparison of analysis results will take place in order to see how both a buildings are performing under lateral and seismic loads and finding a seismic parameters like time period, base shear, lateral displacement, and storey displacement are checked out.

scholarly journals Effect of Location of Shear wall on Torsional Performance of Symmetric and Asymmetric High Rise Building

2021 ◽  
Vol 9 (VI) ◽  
pp. 5237-5243
Author(s):  
Hridya. K
Keyword(s):  
Shear Walls ◽  
Shear Wall ◽  
Lateral Loads ◽  
Base Shear ◽  
Flat Slab ◽  
High Rise ◽  
High Rise Building ◽  
Wide Range ◽  
The Cost ◽  
Post Tensioned

Torsion force is a load that is a applied to a building through torque. The torque applied creates a shear stress. If a torsion force is large enough, it can cause a building to undergo a twisting action. The main aim of the project is to study the effect of location of shear wall on torsional performance of symmetric and asymmetric high-rise building ,post tensioned slabs are being used in the construction of building hence the thesis also analyze these post tensioned slab structures by changing shear wall configuration. Post tensioned slab structures have weak resistance to lateral loads. so to provide stiffness to structures against lateral forces shear walls are used. A study of 30 storey building in zone III, is considered and determine various parameters like base shear, storey drift, and storey displacement.post-tensioning is a mature technology as it provide efficient, economic and elegant structural solutions for a wide range of applications. Post-tensioned flat slab could be a better option compared to RCC flat slab, in respect of the cost of project and time of construction. ETABS 2017 software is used for the analysis.

scholarly journals Determination of Optimum Position of Shear Wall in an Irregular Building for Zone III & IV

2019 ◽  
Vol 9 (1) ◽  
pp. 174-183
Keyword(s):  
Comparative Study ◽  
Lateral Displacement ◽  
Shear Walls ◽  
Shear Wall ◽  
Lateral Stiffness ◽  
Base Shear ◽  
Modeling And Analysis ◽  
Lateral Forces ◽  
Optimum Position ◽  
External Forces

Stiffness is the property of the structure that is responsible for absorbing the external forces. For the case a multistory building, when the height of the building increases, the lateral stiffness of the building decreases. With low lateral stiffness, the building becomes more vulnerable to lateral forces like wind and earthquake. In order to prevent the structure from damage from the lateral forces, lateral stiffness is induced in the structure by means of shear walls. With the introduction of shear wall, we observe a considerable decrement in lateral displacement and increase in base shear. The resistance of lateral forces in terms of magnitude by shear wall depends on its location in the building. In this paper, a G+15 storey building is considered. The building is irregular in nature (T shaped). A comparative study is done to obtain the optimum position of shear wall in the structure. For optimization, the total length of the shear wall in the structure is kept constant. The whole modeling and analysis is done by ETABS v. 2016. The comparative study is done on the basis of base shear, storey displacement & storey drift. The above values are calculated by the dynamic approach of analysis of building subjected to seismic loading.

Elastic Performances of Short Pier Shear Wall Subjected to Lateral Loading

2011 ◽  
Vol 368-373 ◽  
pp. 1227-1230
Author(s):  
Shi Mei Liu ◽  
Dong Sheng Huang
Keyword(s):  
Cross Section ◽  
Shear Walls ◽  
Shear Wall ◽  
Lateral Loading ◽  
Deflection Curve ◽  
Element Analysis ◽  
Horizontal Section ◽  
Mechanical Performances ◽  
The Moment ◽  
Minimum Ratio

The formulas to define the minimum ratio of length-to-thickness of the pier cross section of short-pier shear wall is presented, by which the short pier shear wall is distinguished from the irregular cross-section column frame numerically. According to the results of finite element analysis of typical short-pier shear walls, the elastic mechanical performances of them were investigated. Conclusions were achieved that the flange width hardly influence on the moment of piers but significantly influence on the magnitude of stresses in the horizontal section and the top displacements of walls; the deflection curve of short-pier shear wall is flexural-shearing type, equations and diagrams to define the position of the contra-flexural point in the curve are provided.

scholarly journals Some aspects of shear wall design

1972 ◽  
Vol 5 (3) ◽  
pp. 89-105
Author(s):  
T. Paulay
Keyword(s):  
Structural Damage ◽  
Lateral Displacement ◽  
Shear Walls ◽  
Shear Wall ◽  
Lateral Stiffness ◽  
Lateral Loads ◽  
Potential Strength ◽  
The Subject ◽  
Seismic Origin

The usefulness of certain walls in the structural planning of multistorey buildings
in particular has long been recognised. When external or internal walls are situated in advantageous positions they can be very efficient in resisting lateral loads originating from wind or earthquakes. In addition to the potential strength, which shear walls possess, they offer considerable lateral stiffness and thus can protect a building against non-structural damage that arises when lateral displacement or sway becomes excessive during a moderate seismic disturbance. Only in the last few years did the 
subject receive more attention and many aspects of the behaviour of shear walls are still
 being studied and evaluated. Because of necessary space limitations relevant features, which have been treated in well known publications, will be mentioned very briefly here, but reference to the appropriate source will be made. Other aspects, which are now understood a little better because of more recent research efforts, are presented in more detail. Emphasis is placed on features of behaviour relevant to loading of seismic origin rather than on design recipes.

scholarly journals Effective Shape of RC Frame Building with their Optimum Location of Shear Wall

2019 ◽  
Vol 9 (2) ◽  
pp. 5283-5288
Keyword(s):  
Lateral Displacement ◽  
Tall Buildings ◽  
Shear Walls ◽  
Shear Wall ◽  
Lateral Load ◽  
Rc Frame ◽  
Optimum Location ◽  
Wall Area ◽  
Building Models ◽  
Prime Concern

As per the previous records of earthquakes, there is an increase in the demand of use of earthquake resisting structures. So it is necessary and prime concern of designer to design and analyses the structures by considering seismic effect to provide adequate safety to structure against lateral loads. Many existing RC frame buildings located in seismic zones are deficient to withstand earthquakes. Insufficient lateral resistances, improper shape and poor detailing of reinforcement are the main reasons for inadequate seismic performance of multi-storey building. Shear wall system is one of the most commonly used lateral-load resisting technique for high-rise buildings. Shear walls have very high in-plane strength and stiffness, which can be used simultaneously for resisting large horizontal and gravity loads. In tall buildings, it is very important to ensure adequate lateral stiffness to resist lateral load. The aim of this work is to determine the most effective shape of building with their optimum location of shear wall in multi-storey buildings. For this purpose five different shaped (i.e. square shape, rectangular shape, T-shape, U-shape and H-shape) fifteen storeyed building models each has been with their optimum location of shear wall. Building plan area and shear wall area are same for all different shaped fifteen storeyed building models. Models are analyzed in earthquake zone IV for comparing storey displacement, storey drift, storey shear and time period of buildings. Earthquake load is calculated as per IS: 1893-2016 (Part-1), the various parameters like response reduction factor, importance factor, zone factor are taken from IS: 1893-2016 (Part-1) and are applied to the buildings located in Zone IV. The buildings are modeled and analyzed using software ETAB 2017 and finally concluded that the square shaped building with their optimum location of shear wall is more effective other than different shaped buildings to control the lateral displacement in up to 15 stories buildings.

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