Seismic Analysis

EVALUATION OF SEPERATION faulting BETWEEN MULTISTOREY BUILDINGS SUBJECTED TO DYNAMIC SEISMIC LOADDr. G Sridevi1*(0000-0002-5922-3132), Mr. Umesh Biradar 2(0000-0003-0087-9433), Mr. G Sudarshan 3(0000-0002-5129-5465) and , Mr. A Shivaraj 4(0000-0002-7437-1256) 1234 B V Raju Institute of Technology, Narsapur, India Abstract When structures atomic number 18 beneath earth temblor forces, adjacent structure may collide with each opposite due to different combat-ready characteristics. When construction vibrates out of phase and maro hotshotd dislocation among buildings are non sufficient to accommodate their relational trends, this can cause severe damage to the structures and it is known as unstable throbbing.Most of the time it is not possible to maintain sufficient buffeting gap among adjacent buildings. Present work evaluate the token(prenominal) separation gap required amidst high-rise building sit arounds considered. ii high-rise building of 10 tarradiddle and 15 storey are deterrent exampleled and analysed for dynamic time history synopsis for the EI Centro ground motions and minimal m exclusivelyeus gap between buildings has been discussed.Keywords seismic throb, RC construction, ETABS, Time History summary.INTRODUCTIONBecause of expanding population and estate esteems, structures are being built to close to each other. During a quake it is expected that, they will pound against each other. This repeated hitting application is referred as seismic quid. Pounding of structures could have cause severe damage, as neighbouring structures with several(a) dynamic attributes vibrate out of phase and there is undermanned separation gap to accommodate the relative movements of adjacent structures.This highly congest construction system in the metropolitan cities is the major concern for the seismic pounding. The most simple and viable manner for controlling the issue and flow the harm ca apply by it is to give enough separation gap between the adjacent structures.LITERATUREShehata (2006) examined structure pounding response and proper seismic hap dissipation technique. Three categories of recorded earthquake innervation are used for input. The meat of impact is examine using running(a) and nonlinear get together force model for different separation distances and compared with nominal model without pounding consideration. And it is concluded that, an increasing gap width is likely to be impressive to minimize the effect of seismic pounding.Mizam Dogan et.al (2009) carried stress examinations on outline models for various effect focuses and investigation on pounding. It is concluded that pounding forces are not totally absorbable on account of their high esteems but sort of their consequences for structure can be decreased by setting various(a) cloths between adjacent structures or by strengthening basic frameworks.Push over is a static nonlinear analysis method to estimate seismic morphologic deform ations. It gives force displacement relationship of a structure or morphologic element. Horizontal load is applied in a specified trope in increments and for a given applied shear force, associated displacement is rig until it reaches its maximum capacity of deformation.As the storey drift increases the columns are subjected to extra moment leading to the failure of the structure. A B Kawade et.al studied the minimum gap to be provided between the adjacent buildings using push over analysis. Response spectrum analysis was carried out by taking the data of EI Centro earthquake on different models. The results indicated that the acceleration and shear force produced because of pounding varies with the storey height and peak storey drift depends on the ground excitation characteristics.The effect of pounding is observed to be much predominate when blast levels of adjacent building are different constructing separate buildings with equal horizontal surface heights is wholeness o f viable solutions to prevent seismic structural pounding. It was excessively observed that the separation distance to be maintained increases with the increase in peak ground acceleration values.Jeng-Hsiang Lin et.al (2002) investigated the seismic pounding prob mogul of buildings in the Taipei metropolitan area.Detailed procedures of the analytical method are presented. And concludes that pounding probability of adjacent buildings is found to be significantly affected by the natural period of individual buildings and the period ratio of the adjacent buildings. delinquent to the lack of proper treatment of the vibration phases of adjacent buildings, it is found that the method used in the current Taiwan Building Code (TBC97) provides sad estimates for the required building separation distance and produces a non-uniform risk for all the cases investigated in this study.MOTIVATION AND OBJECTIVES OF STUDYTo story the Dynamic Behaviour of Tall Structures.To Evaluate seismal Poundi ng Effect of next Buildings with Consideration of Vertical Geometrical Irregularity.To flying field the Influence of Shear Walls on Seismic Pounding Effect.MODEL DESCRIPTIONIn Present Study Total 3 modellings have been Modelled to Evaluate Dynamic Behaviour of elevated Rise Buildings by Considering Vertical Geometrical Irregularities.Model 1 A send off which consists adjacent multi storey buildings one is 10 storey and the other one is 15 Storey with a separation of 100mm with Masonry infill walls.Model 2 A object which consists adjacent multi storey buildings one is 10 Storey and the other one is 15 Storey with a separation of 100mm in this particular model all infill walls are modelled and designed as shear walls.-47625012700Fig 1 computer program View of the Buildings1219200176530Fig 2 Isometric View of ETABS Model1104900191770Fig 3 Elevation of ETABS ModelMETHODOLOGYThe ruler objective is to evaluate the effects of seismic pounding between cardinal closely spaced multi-storey buildings, to understand the minimum seismic gap between the buildings, modelling is done to study the response of buildings under pounding during EI Centro earthquake.In instal to observe pounding effect between adjacent buildings, two RC buildings of 10 and 15 storey are considered. Both buildings have been modelled and analysed in ETABS 2015 software. establish on the analysis results the clear separation distance is provided. all 3 models have been analysed for nonlinear time history analysis to study dynamic behaviour of buildings.The output results were obtained.In Time History Analysis the ground motion records are given as input. The time history analysis has the ability to perform linear as well as non linear analysis . The ability of this method to account for bidirectional effects by applying leash components of ground motion helps in predicting the response more precisely. In a Linear analysis, it is assumed that the displacement of whole structure does no t take place elastic limit under the application of design forces. when the structure deforms more than elastic limit, non linearity of the structure in terms of geometry or material are to be considered.Bureau of Indian Standards clearly gives in its ordinance IS 4326, that a Separation distance is to be provided between buildings to avoid collision during an earthquake. The IS code provisions are mentioned in following Table.Fig 4 fault Width for Adjoining Structure as per IS 4326 ( Table 1 )Table 1 Seismic ParametersSoil Type MediumResponse Reduction Factor, R 5Importance Factor, I 1.5Zone IVTable 2 solid PropertiesConcrete cube strength, fck30 N/mm2 (M30)Characteristics strength of reinforcing steel, fy415N/mm2(Fe 415)Modulus of elasticity of concrete, E 29.5 kN/mm2Unit weight of concrete 25 kN/m3Table 3 Sectional PropertiesName of the Element Size in mmBeam 1 three hundred * 400Beam 2 300 * 500Beam 3 350 * 600Column 1 300 * 300Column 2 300 * 400Column 3 300 * 500Column 4 300 * 600Column 5 300 * 700Slabs 125Exterior walls,w1 300Interior walls,w2 230 6. RESULTS AND DISCUSSIONS Dynamic Time History Analysis of considered models have been performed in ETABS Software. EI Centro Ground Motions were considered as Input Data for Analysis.Effect of Pounding is studied with a reference to storey displacement. The Storey Height Vs Storey geological fault graph has been plotted to understand the dynamic behaviour of Structure.Fig 2 Storey Displacement curvature for Model 1Fig 2 Storey Displacement Curve for Model 2Fig 3 Storey Displacement Curve for Model 37. result Stiffness of building has got a great influence on displacements in respective directions.In Model I separation gap between adjacent buildings are 100 mm. Displacement observed was 509.883 mm in X direction and 31.881 mm in Y direction. When masonry wall are replaced with shear wall, lateral displacement has reduced in considerable measuring rod to 36.74 % and 80.8 % in X and Y direction respectively.Effect of pounding can be reduced by providing safe separation gap. By the result of Model I we can conclude that minimum safe separation gap between building is 540 mm.Stiffness of building can be enhanced by adopting shear wall to reduce the pounding effectREFERENCESA.B. Kawade , Mr. Abhijeet A. Sahane Seismic pounding effect in building Amrutvahini college of engineering, Sangamner.Alireza M.Goltabar.R, Shamstabar Kami, A.Ebadi, (2008) Analyzing the effective parameters in Pounding Phenomenon between Adjacent Structure due to Earthquake,The 14th World Conference on Earthquake technology, pp. 12-17, Beijing, China.Diego Lopez Garcia, (2004)Separation between Adjacent Nonlinear Structures for Prevention of Seismic Pounding, 13th World Conference on Earthquake engineering science Vancouver, B.C., Canada, Paper No. 478.Jeng-Hsiang Lin, Cheng-Chiang Weng, (2002)A Study on Seismic Pounding Probability of Buildings In Taipei Metropolitan Area, Journal of the Chinese Inst itute of Engineers, Vol. 25, No. 2, pp. 123-135.K.Kasai, V.Jeng, P.C.Patel J.A.Munshi Seismic Pounding Effects Survey and Analysis Illinois Institute of Technology, Chicago,USA.Mizam Dogan and Ayten Gunaydin, (2009)Pounding of Adjacent RC Buildings During Seismic Loads, Journal of Engineering and Architecture, Vol XXII, No 1.Raja Rizwan Hussain et.al. (2013)Non-linear FEM Analysis of seismic Induced Pounding between Neighbouring Multi-Storey Structures, Latin American Journal of solids and structures, pp. 921-939.Shehata E. Abdel Raheem, (2006)Seismic Pounding between Adjacent Building Structures, Electronic Journal of Structural Engineering, Vol. 6, pp.66-74.Susendar Muthukumar and Reginald DesRoches, (2006)A Hertz contact model with non-linear damping for pounding simulation, Earthquake Engineering and Structural Dynamics, Vol.35, pp.811-828.Weng Dagen, Li Tao Bashar Alfarah, Fransisco Lopez-Almansa (2017)Non linear time history analysis of a base isolated RC building in shangha i founded on soft soil Tongji University, Technical university of catalonia, report No. 2634.