International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 09 Issue: 05 | May 2022
p-ISSN: 2395-0072
www.irjet.net
SHEAR WALL ANALYSIS & DESIGN OPTIMIZATION IN HIGH RISE BUILDINGS Mohammed Saadat Hasan Imtiyaz1, Mohd Arbaz Khan2, Adil Ahmed Bhameshan3 Mohd Khaleel Uddin4 Students, Department of Civil Engineering 4 Asst Professor of Civil Engineering ISL Engineering College, Hyderabad, Telangana ---------------------------------------------------------------------***--------------------------------------------------------------------1.1.1 Planning Abstract - Wind and seismic loads are assessed on a 191, 2, 3 UG
story residential building with and without shear walls. The building has four flats on each storey and is located in zone 2. Shear walls in the shape of a L were erected at the elevator and stairwell, as well as at the building's corners. During the analytical phase, vertical loads, moments, lateral forces, and torsion moments were compared for both situations at each floor. Optimization techniques are used to address structural engineering issues. The most difficult high-rise buildings are handled utilising design optimization approaches that include both size and topological optimization. Stability, safety, and response to various types of loads are all considered. Optimization of the wall-frame construction is a component of the project. The displacement, internal stresses, and intensities of this wall and core system were determined when exposed to varied loadings. Key Words: Shear Walls, Optimization, Lateral Forces, Bending Moments, Torsional Moments, Storey Drifts, Maximum Displacements, Internal Stresses, Intensities
1. INTRODUCTION
"The response of any structure during an earthquake is a dynamic phenomenon and the principles of dynamics must be used to explain the behavior of the buildings during ground motions. Two broad approaches of earthquakes analysis of multistoried structure in present day are: I. Equivalent static approach II. Dynamic method of analysis.
1.1 PLANNING AND DESIGN OF BUILDING FROM SEISMIC VIEW POINT Certain factors should be taken into consideration in planning and design of multistory buildings in seismic zones; these factors are established from damage study of buildings during the earthquakes. |
2. Two adjacent buildings or adjacent blocks of the same buildings should be separated enough to avoid damage due to pounding action. Impact absorbing pads may be interposed between the blocks to avoid pounding damage. 3. Earthquake resisting elements in the form of bracing shear walls or suitable column arrangements should be provided in both the directions of the building. 4. Shear walls should be well distributed over the plans. If the functional requirements dictate adoption of geometrical, asymmetry in the plan of the building, it will be appropriate to adjust the moments of inertia of shear walls so that the center of inertia of shear walls and the center of mass of the building in each storey coincides with the center of stiffness
1.1.2 Design principles
Structurally a multistory building may consist of a frame with rigid connections, a frame with braces, parallel sets of shear wall, box units or a combination of these sets of elements. design of multistory buildings for earthquake motions requires the consideration of several factors such as probable intensity of earthquake, stiffness of the structure and its ductility and without impairing its functional utility.
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1. The torsion effect in building should be minimized in unsymmetrical plans such as T, L or U shapes and unsymmetrical elevations should be avoided.
Impact Factor value: 7.529
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1. In elastic studies indicate the desirability of various storeys for adequate behavior. The inverted parabolic distribution of seismic force is appropriate to take off its effect. This will also suffice against whipping effect in top storey of building. 2. Ductility demands in lower storey may be smaller compared to higher stories unless special care is taken against large displacements. A more or less uniform distribution of ductility is desirable for seismic view point. "Strong column weak girder" will be good basis of design for withstanding severe shock of earthquake. 3. Design for torsion needs special consideration. Even for symmetrical buildings an eccentricity of at least 5% of the dimension of the building in plan should considered to compute torsion shear. 4. Continuity in structural members is desirable since it provides multiple path of load resistance. Therefore rigid or semi rigid connections in steel and monolithic connections in concrete are desirable even when braces or shear walls are used.
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