IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308 _______________________________________________________________________________________ Volume: 06 Issue: 04 | Apr-2017, Available @ https://ijret.org 1 COMPARISON OF BEHAVIORAL ASPECTS OF HIGH RISE MULTISTORIED STEEL BUILDING WITH MASS PENDULUM SYSTEM AND X- BRACING SYSTEM USING STAAD.PRO V8I SOFTWARE Jemal Bedane Halkiyo 1 , Sultan Bedane Halkiyu 2 , Raju Ramesh Reddy 3 1 Lecturer, Civil Engineering Department, Bule Hora University, Bule Hora, Ethiopia 2 Lecturer, Civil Engineering Department, Bule Hora University, Bule Hora, Ethiopia 3 Professor, Civil Engineering Department, Arba Minch University, Ethiopia Abstract High Rise Multistory steel building developments have been rapidly increasing throughout our Country and worldwide. The lateral deflections of buildings includes bending and shear deflection are challenging part to the designed and existed building. Previously the X-bracing system is more effective to control the deflection of the high rise steel building. In this research, the new system called Mass pendulum Mechanism is introduced to control the lateral deflection of the steel building and the same compared with the X –bracing system. Mass pendulum system which is proved to be the better deflection controlling system is studied in depth and the overall comparison of the system with other deflection controlling mechanisms is outlined and analyzed. The use of this mechanism for design of high rise steel building can increase the lateral stiffness of building and decrease lateral displacements. The maximum reduction in the lateral displacement occurs at an angle of mass 45 degree with the weight of mass equal to 50% of the lateral load. In addition the Mass Pendulum Mechanism reduces bending moments and shear forces in the vertical and horizontal members of load transferring system. Moreover, stability of this system increases and the P-Delta effects decline. So, the columns will be protected against reaching nonlinear state. Finally the mass Pendulum system proved that it’ s economical compare with X-bracing system in terms of structural steel material. Keywords: High-rise steel building, X-bracing system, Mass-pendulum mechanism, Deflection, Lateral deflection, lateral stiffness and Plate stress Abbreviations:- XBS:-X-Bracing System, e-Eccentricity, M-self weight of building, MPS-30 DEGREE- Mass pendulum system at 30 degree, MPS-45 DEGREE- Mass pendulum system at 45 degree, MPS-60 DEGREE- Mass pendulum system at 60 degree. ---------------------------------------------------------------------***--------------------------------------------------------------------- 1. INTRODUCTION The introduction of structural steel to building construction in the late 19th and early 20th centuries, Engineers have recognized that steel building and structures have performed extremely well compared with structures of other types of construction. The selection of structural steel for a building’s framing system brings numerous benefits to a project. Speed of Construction, sustainability, strength and aesthetic, efficient design flexibility are some advantage of steel structure. Comparatively high rise multi story steel buildings are light in weight which makes steel structure very susceptible to lateral load. Engineers overcome the deflection in multistorey steel building by providing bracing. Steel braced frame is one of the structural system used to resist lateral loads in multi-storeyed buildings. X-bracing is more effective system of controlling deflection than the other bracing system. Even though this system controls the deflection of the building caused by the lateral loads, one needs a large quantity material used as a bracing element. Generally, in multistorey steel building, there may be high deflection due to relative light weight of steel to that of concrete and the height of the building. Many researchers steel bracing is a high efficient and economical method of resisting horizontal forces in a frame structure. Bracing has been used to stabilize lateral for the majority of the world’s tallest building structures. Bracing is efficient because the diagonals work in axial stress and therefore call for minimum member sizes in providing stiffness and strength against horizontal shear. The effectiveness of varies types of steel bracing on the structure has also been investigated. More importantly, the reduction in lateral displacement has been found out for different types of bracing system in