Determination of Seismic parameters of R.C.C. Building Using Shear Core Outrigger, Wall Belt and Truss Belt Systems

Structural analysis has been done since decades to study the behavior of lateral load resisting systems and for that outrigger structural system has done a tremendous job in this regard. The present work is to study high-rise G+10 3D computer model RCC structure under the influence of earthquake forces. The outrigger location used according to Taranath method. Response spectrum method is used for observing the performance of total seven different cases which include regular, shear core, outrigger and wall belt and outrigger and truss belt supported system. These are studied and parameters such as Base shear, column axial forces and member shear forces were examined. Efficient cases for all the parameters have discussed in this article too.


I. INTRODUCTION
The examination of the seismic activities of the earth artificially via structural software reveals that whenever the R.C.C. multistory structure has located around the area of epicenter of any earthquake, the waves creates a harmful effect on it. So, to counteract the lateral forces in the design of tall structures, the parameters to be maintained are strength, resistance against lateral deflection, stability to avoid structural and non-structural destruction. For the design requirements, structural examiners have offered new systems to maintain the above parameters are to use shear wall, truss systems, moment resisting frames, base isolation systems and one of them is outrigger and belt supported systems. In this system, when the structure rotates against lateral effects undergoes deflection and rotation. To counteract this, stiff core is provided in the middle of structure connected by stiff arms that resists the whole structure and transfer all the lateral loads around the beam-column connections. Hence the performance of the multistory building depends upon the stiffness generated system.

II. OBJECTIVE OF THE PRESENT STUDY
The objectives of this work are as follows: x Determination of effective case among general, shear core outrigger and belt wall supported s ystem as well as shear core outrigger and truss supported system. x To determine Base shear response when seismic forces are applied in X, Y and Z direction to the structure. x To examine column Axial Forces for total seven cases with efficient case to determine minimum axial force.
x To find member Shear Forces and Bending Moment values with efficient case of all 7 cases. x To determine and compare member Torsion values.
x To show whether truss is better or shear wall at an optimum outrigger height of structure.

III. PROCEDURE AND 3D MODELLING OF STRUCTURE
In this paper, G + 10 storey residential building with 43.26m height having 5 bays of 3 m each in X direction and 7 bays of 3 m each in Z direction for complete 7 cases that are mentioned in table 1 and figure 1 & 2. Depth of foundation taken as 3m and height of each floor is taken as 3.66m. According to several cases mentioned in table, DFURQ\P VXFK DV 6 WR 6 XVHG WR UHSUHVHQW ³6WUXFWXUH´ DQG 7 7 XVHG WR UHSUHVHQW DV ³7\SH´ ZHUH PDGH Indian Standard code 1893 (part 1): 2002 has used for seismic analysis of all cases, various parameters were taken presumed that the structure has located in seismic zone IV and on rested over hard soil. Several data used in this study for modeling and loadings are as follows: ‡ Response reduction factor R = 5 ‡ Importance factor I = 1 ‡ The fundamental natural period (Ta) for X and Z direction has taken as 1.2978 & 0.8496 seconds 3D models constructed in Staad pro, a complete software tool for analysis has used for total seven Cases and work has evaluated.     /dx.doi.org/10.22161/ijaers.5.9.36  ISSN: 2349-6495(P) | 2456-1908(O) www.ijaers.com Page | 308 Graph 2: Column Axial Force comparison    x Base Shear shows minimum response value other than general structure which seems very effective under seismic effect is Regular building with shear core.
x To resist moment, buildings are recommended to be designed as Shear Core outrigger and wall belt supported system shows least value among all cases. x If column design is the main criteria, building axial forces shows a least value when only Shear Core system will be used. x Shear Core outrigger and wall belt supported system will again be effective in shear forces for both Y and Z directions in members.
x Member torsion values have seen effective and efficient case for building with shear core and wall outriggers.
x Overall parameter controlling case among all is Shear Core outrigger and wall belt supported system.
x Wall belt system is more effective than truss belt system which has seen in this work.