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Seismic Analysis of Multistoreyed RC Building Due to Mass Irregularity by Time History Analysis
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Seismic Analysis of Multistoreyed RC Building Due to Mass Irregularity by Time History Analysis
1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 621 SEISMIC ANALYSIS OF MULTISTOREYED RC BUILDING DUE TO MASS IRREGULARITY BY TIME HISTORY ANALYSIS Sampath Nagod1 , Prof. A.J.Zende2 ¹Student of Master of Technology in Structural Engineering BLDEA’s V.P. Dr. P.G Halakatti College of Engineering and Technology, Vijayapur - Karnataka, India. ²Professor at Civil Engineering Department BLDEA’s V.P. Dr. P.G Halakatti College of Engineering and Technology, Vijayapur - Karnataka, India. ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - From earthquakes history, it can be observed that if the structures are not appropriately analyzed and constructed with necessary quality, then it may lead great damage and loss to human lives. We can see many of structures are fully or partially damaged due to earthquake. So, there is need to establish seismic responses of buildings. Seismic analysis of the structure is done to determine seismic responses by time history analysis which is one of the important techniques for structuralseismicanalysisespecially when the evaluated structural response is non- linear in nature. To perform such an analysis, a representative earthquake time history is required for the structure being evaluated. In this present work non-linear dynamicanalysis of 12 storeyed RC building having mass irregularity considering Bhuj earthquake time history is carried out using ETABS software. Then, Lead Rubber Bearing is manually designed and isolator properties are assigned to the building. Various parameters like Base shear, Time period and Storey displacement are determined for regular and mass irregular buildings with fixed base and base isolated condition and compared with each other. Key Words: Base isolation, Mass irregularity, Time history analysis, Bhuj earthquake. 1. INTRODUCTION 1.1 General All over the world, there is much need of construction of high-rise multi-storey buildings due to the urbanizationand increase in population. These multi-storey structures are unsafe when they are subjected to the earthquakes. While earthquake engineering is noticeably progressed,structures failures are found wherever strong disturbances caused due to the motion of the earth. Earthquake forces are unpredictable. Environmental loads like an earthquake are harmful and last only for the small durationbutcausesevere damage to the structures and harm lives of people. Yearly near 1.5 crore, people lose their lives due to the earthquake that strikes the earth. The multi-storey structure generally subject to failure due to seismic forces at the location where there is a weakness. The weakness of structuresisduetothe presence of irregularities in stiffness, strength and mass. Earthquake code IS 1893 is used to design multi-storey buildings. But Ahmedabad during Bhuj earthquake, because of mass irregularity the buildings got severely damaged. Excess mass leads in reduction of ductility of vertical load resisting elements and increase inertia forces and thus increase the tendency towards collapse. Excess mass on upper floors has a more unfavorable effect than those at lower floors. Thus there is the necessity of designing these structures for earthquake loading so that they sustain moderatetostrongearthquakeforces.Multi-storeybuildings and their structural members can be protected against earthquake forces by installing structural isolation devices. The technique used to avoid earthquake damage by separating the structure from the ground known as base isolation. 1.2 Base Isolation Base isolation is a technique in which during an earthquake, separating the superstructure or reducing the lateral movements of building superstructure from the movement of ground or foundation is done. The bearings of base isolation are designed in such a way that they are stiff vertically and flexible horizontally to allowforthedifference in lateral movement while still supporting the superstructure. The structures with base isolation are different than that of fixed base structure, in which the connection between the superstructure and the foundation are rigid and the superstructure translationinall directionis constrained. Behavior of the building with base isolators is shown in below fig Figure 1.1: Behaviour of the buildingwith BaseIsolators
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 622 The main aspire of base isolation is to decrease the earthquake force produced on building’s superstructure. To some amount by reducing the superstructure’s spectral acceleration, the lessening in seismic forceatsuperstructure is achieved. By mounting the base isolated structure fundamental period and through damping caused by dissipation energy within bearing the accelerations are reduced. The effect of base isolated and fixed base building on spectral acceleration is shown in fig below. Figure1.2: Effect of Seismic Isolation on Spectral Acceleration Due to the reduced lateral stiffnessofisolatedstructures, the effective period of the superstructure is increased. The stiff structures with the small period the base isolation are most effective. Below equation shows the relation between effective period and the stiffness. T = 2π√ (M/K) As, ↓K => ↑ T Where, T = Period (sec.) K = Stiffness (kN/mm) M = Mass (N –Sec.2/mm) 1.3 Objectives of the Study In the present study, the work includes the analysis of a 12 storey reinforced concrete mass irregular building in accordance with IS1893-2002 provisions; one with fixed base and other with base isolated. The objectives of the study are as follows; 1. To carry out modeling and analysis of multi- storeyed RC building with and without mass irregularity by using ETABS software and study the effect of seismic forces on different models. 2. To design and study the effectivenessofleadrubber bearing used as a base isolation system 3. To carry out comparison between fixed base and base isolated building by Time history analysis considering Bhuj earthquake record and obtaining different parameters such as Base shear, Time period and Storey displacement. 2. METHODLOGY In this study, 12 storied reinforced concrete building with and without base isolation are considered. In addition to that, mass irregularity is also taken into consideration by providing heavy mass at 11th floor. The RC frame with infill panels is modeled for Indian seismic zone V IS: 1893-2002 having medium stiff soil. Time history analysis is performed on buildings using ETABS software. 2.1 Models considered for analysis Model 1: Building with fixed base Model 2: Building with base isolation Model 3: Mass Irregular Building with fixed base Model 4: Mass IrregularBuildingwithbaseisolation 2.3 Structural specifications 2.3.1Member properties Table 2.1: Member properties No of storey 12 Size of Building 20 x 12m Spacing of frames in X direction 5m Spacing of frames in Y direction 4m Size of Beam 300 x 450mm Size of Column 300 x 500mm Storey height 3m Thickness of slab 150mm Thickness of wall 230mm Height of parapet wall 1m 2.3.2Load intensities Table 2.2: Load intensities Live load on Roof 1.5 kN/m² Live load on Floor 3.0 kN/m² Floor finish 1.0 kN/m² Swimming pool 18 kN/m² 2.3.3Material properties Table 2.3: Material properties Grade of Concrete M25 Grade of Steel Fe415 Figure 2.1: Plan of Building
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 623 Figure 2.2: 3D view of Building Lead Rubber Bearing is used as a baseisolator.Afteranalysis of fixed base RC building with and without mass irregularity using E-TABS software, the maximum vertical reaction is obtained for respective models. By using this vertical reaction lead rubber bearing is designed manually and the properties obtained by design are used as base isolator properties for model 2 and model 4. 2.4 Lead Rubber Bearing Properties Table 2.4: Summary of Lead Rubber Bearing Properties Properties Building without mass irregularity Building with mass irregularity Axial load on column 4981kN 5330kN Required stiffness (keff) 5011.26 kN/m 5362.38 kN/m Bearing horizontal stiffness (Kb) 1005.93 kN/m 1078.93 kN/m Vertical stiffness (Kv) 889963.50 kN/m 992048.12kN/m Yield force (F) 75.13 kN 80.40 kN Stiffness ratio 0.1 0.1 Damping 0.05 0.05 3. RESULTS AND DISCUSSION 3.1 Base Shear From the obtained results, it is observed that for a 12 storey RC Base Isolated buildingwithoutmassirregularityanalyzed by Time history analysis (Bhuj earthquake), Base Shear is decreased by 38.68% in the X direction and by 49.47% in Y direction compared to a fixed base building without mass irregularity. Similarly, Fixed base building with mass irregularity analyzed by Time history analysis (Bhuj earthquake), Base Shear is increased by 31.08% in X direction whereas decreased by 14% in Y direction compared to a fixed base building without mass irregularity. Figure 3.1: Base Shear Comparison 3.2 Time Period From the obtained results, it is observed that for a 12 storey RC Base Isolated buildingwithoutmassirregularityanalyzed by Time history analysis (Bhuj earthquake), Time Period is increased by 26.77% in the X direction and by 28.46% in Y direction compared to a fixed base building without mass irregularity. Similarly, Fixed base building with mass irregularity analyzed by Time history analysis (Bhuj earthquake), Time Period is increased by 8% in X and Y direction compared to a fixed base building without mass irregularity. Figure 3.2: Time Period Comparison
4.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 624 3.3 Storey Displacement From the obtained results, it is observed that for a 12 storey RC Base Isolated buildingwithoutmassirregularityanalyzed by Time history analysis (Bhuj earthquake), storey displacement is increased by 25.147% in the X direction whereas decreased by 31.964% in Y directioncomparedtoa fixed base building without mass irregularity. Similarly, Fixed base building with mass irregularity analyzedbyTime history analysis (Bhuj earthquake), storey displacement is decreased by 7.199% in X direction and by 4.472% in Y direction compared to a fixed base building without mass irregularity Table 3.1: Storey Displacement along X direction Storey Model 1 Model 2 Model 3 Model 4 12 101.4 126.9 93.8 106.6 11 98 123.6 91.9 103.7 10 93.2 118.2 88.4 98 9 87.5 110.7 83.5 90.7 8 79.6 101.9 78 82.1 7 69.4 92.1 73.8 72.9 6 58.5 81.6 69.2 66.8 5 49 71 62.4 61.5 4 38.7 61.6 52.8 56.2 3 28.4 52.7 40.3 50.7 2 18.3 43.7 25.4 43.6 1 7.3 33.2 10 33.8 Base 0 13.7 0 15 Figure 3.3: Storey Displacement in X direction Table 3.2: Storey Displacement along Y direction Storey Model 1 Model 2 Model 3 Model 4 12 136.4 92.8 130.3 98.9 11 131.2 91.1 125.1 96.9 10 121.9 88.5 113.8 93.2 9 109.1 84.9 99.5 88.6 8 94.3 80.4 84 83.6 7 80.6 75.1 69.1 78.2 6 71.9 69.2 57.5 72.4 5 65.6 62.8 50.3 66.1 4 56.3 56.1 42 59.6 3 43.8 49.9 32.2 52.7 2 28.9 43.3 21.5 45 1 12.6 34.4 9.6 35.4 Base 0 10 0 10.5 Figure 3.4: Storey Displacement in Y direction 4. CONCLUSION From the analysis and results, it is observed that the base isolator and mass irregularity in a building influence on the seismic response of a building. Bycomparingtheresponseof the structure, following conclusions are made. 1. The Base shear is decreased by about 40% in the base isolated building when compared to the fixed base building. It is also observed thattheBaseshear is increased by about 30% in mass irregular building compared to the regular building. 2. As compared to all four models studied, Base shear is found to be minimum in a regular building with base isolators.
5.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 625 3. Time period of a building increased by about 27% by the use of base isolators which leads to less transfer of lateral forces at the time of an earthquake. It is also observed that mass irregular building have about 8% increased time period compared to the regular building. 4. At the base, fixed base buildings have zero displacementswhereasbase isolatedbuildingshave a considerable amount of bottom displacement. 5. Storey displacement is increased by 25% in the buildings with base isolators compared to the buildings with a fixed base.Displacementisreduced by 7% in mass irregular buildings compared to regular buildings. Finally, it can be recommended that Time History analysis shall be carried out for the multi-storeyed buildings before their construction for earthquake function with a high magnitude such as Bhuj earthquake time history as considered in present study along with consideration of mass irregularity in buildings. 5. REFERENCES 1. IITK-BMTPC EQTips – National Information Centre of Earthquake Engineering (www.nicee.org) EQ Tip6 2. C.P. Providakis “Effect of LRB isolators and supplemental viscous dampers on seismic isolated buildings under near-fault excitations” Engineering Structures ELSEVIER 2007 3. Naveen K, Dr. H.R Prabhakara and Dr. H Eramma “Base Isolation of Mass Irregular RC Multi-Storey Building” International Journal of Research in Engineering and Technology. 4. Ms. Minal Ashok Somwanshi and Mrs. Rina N. Pantawane “Seismic AnalysisofFixedBaseandBase Isolated Building Structures.” International Journal of Multidisciplinary and Current Searches. July/August 2015. 5. Mr. Pathan Irfan Khan, Dr. Mrs. N.R.Dhamge “Review Paper on Seismic Analysis of Multistoried RCC Building Due To Mass Irregularity” International Journal of Science & Engineering Development Research June 2016 6. Vinodkumar Parma, G.S.Hiremath “ Effect of Base Isolation in Multistoried RC Irregular Building using Time history analysis.” International Journal of Research in Engineering and Technology. 7. Ashish R. Akhare, Tejas R. Wankhade “Seismic Performance of RC Structures using different Base Isolators.” International Journal of Engineering Science and research Technology. May 2014. 8. Syed Ahmed Kabeer K I, Sanjeev kumar K.S “Comparision of Two Similar Buildings with and without Base Isolation.” International Journal of Advanced Researches, Ideas and Innovations in Technology. October 2014. 9. Jyothi. C. Hawaldar, Dr. D. K. Kulkarni “Earthquake Analysis Of A G+12 Storey Building With And Without Infill For Bhuj And Koyna Earthquake Functions” International Journal of Research in Engineering and Technology. August 2015 10. Moussa Leblouba “Combined System for Seismic Protection of Buildings.” International Symposium on Strong Vrancea Earthquakes and Risk Mitigations. October 2007. 11. L. Di Sarno, E. Chioccarelli and E. Cosenza “Seismic Assessment of an Irregular Base Isolated Hospital.” The 14th Word ConferenceonEarthquake Engineering. October12-17, 2008, Beijing, China. 12. H.P. Santosh, K. S. Manjunath, K. Satish Kumar “Seismic Analysis of Low to Medium Rise Buildings for Base Isolations.” International Journal of Research in Engineering and Technology. 13. Sonali Anilduke, Amay Khedikar “Comaprision of Building for Seismic Response by using Base Isolation.” International Journal of Research in Engineering and Technology. 14. Abdolrahim Jalali and Peyman Narjabadifam “Optimum Modal Characteristics for Multistory Buildings Isolated with LRB’s.” 4th International Conference on Earthquake Engineering. Taipei, Taiwan. October 12-13, 2006. 15. Indian Standard Criteria for Earthquake Resistant Design of Structures IS 1893(Part 1): 2002. 16. Ductility Detailing of RC Structures Subjected to Seismic Forces IS 13920 : 1993
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