Seismic strengthening of structures

Abstract: Shear Wall And Steel Bracing Systems Are Most Widely Used In Medium To High Rise Buildings To Provide Stiffness, Strength And Energy Dissipation Required To Resist Lateral Load Imposed By Earthquakes And Wind. In The Past Shear Wall And Steel Bracing Have Been Proved As Most Feasible Solution For Seismic Retrofitting Or Strengthening Of Buildings. The Newly Adopted Performance Evaluation Methodology And Capacity Design Principles Are Examples Of These Important Advancements In Seismic Engineering. Many Existing Rc Buildings Need To Retrofit To Overcome Weaknesses To Resist Seismic Loads. Therefore, There Is An Essential Need To Upgrade The Seismic Performance Of Existing Rc Buildings So That They Can Meet The Requirements Of The New Performance-Based Seismic Design Techniques.
In This Paper, Seismic Performance of RC Building Rehabilitated With Shear Wall and Concentrated Steel Bracing. An Earthquake Load Is Calculated And Applied On Nine Stories Building Located In Zone Iii. A Comparison Has Been Made Between The Effectiveness Of Different Types Of Steel Bracings With Concrete Shear Wall At Different Locations Of The Building. The Performance Of The Building Is Evaluated In Terms Of Story Drifts, Lateral Displacements, Bending Moments And Base Shear.
Keywords: Retrofit, Seismic Strengthening, Steel bracings, Shear walls.
Title: A Comparative Study of Seismic Strengthening of RC Buildings by Steel Bracings and Concrete Shear walls
Author: Yaseer Alashkar, Sohaib Nazar, Mohammad Ahmed
International Journal of Civil and Structural Engineering Research
ISSN 2348-7607 (Online)
Research Publish Journals

Shear wall and Steel bracing systems are most widely used in medium to high rise buildings to provide stiffness, strength and energy dissipation required to resist lateral load imposed by earthquakes and wind. In the past shear wall and steel bracing have been proved as most feasible solution for seismic retrofitting or strengthening of buildings. The newly adopted performance evaluation methodology and capacity design principles are examples of these important advancements in seismic engineering. Many existing RC buildings need to retrofit to overcome weaknesses to resist seismic loads. Therefore, there is an essential need to upgrade the seismic performance of existing RC buildings so that they can meet the requirements of the new performancebased seismic design techniques. In this paper, seismic performance of RC building rehabilitated with shear wall and concentrated steel bracing. An earthquake load is calculated and applied on nine stories building located in zone III. A compa...

Seismic rehabilitation of structures is dragged attention of many researches worldwide and accordingly several techniques are developed till date. However the major shortcomings correlate with high cost, long time for construction and special knowledge and skill. This paper focuses on seismic strengthening of reinforced concrete structures by Post-Tensioned Metal Strap (PTMS) technique. By strengthening beam-column joints and critical elements using this technique, a considerable gain in strength and ductility of the whole structure is achieved. To evaluate seismic response and overall structural capacity, the results from a bare and strengthened frame tested under the BANDIT project were analysed using DRAIN-3DX analysis. The analytical models were studied under varying peak ground accelerations of 0.05 g to 0.35 g. From several analytical results and their correlation with experimental results from previous works, strengthening by PTMS technique is found to be efficient in increas...