Optimum Position of Shear Wall in Soft Story.pptx

Optimum Position of Shear Wall in Soft Story

1. OPTIMUM POSITION OF SHEAR WALL IN SOFT STOREY BUILDING SUBJECTED TO SEISMIC LOAD Guided by, Presented by, Mrs. Tincy Anna Yohannan n a m e Asst. Professor S 8 B T E C H D e pt. of civil Engineering R e g . n o : 1

2. INDEX INTRODUCTION NEED FOR STUDY LITERATURE REVIEW SCOPE AND OBJECTIVES METHODOLOGY RESULT AND DISCUSSION CONCLUSION REFERENCE 2 D e p artment of c i vil engineering

3. INTRODUCTION Earthquake goes on creating disasters such as failure of structure and fatality. Shear wall is one of the most popular means of protecting a structure against earthquake forces . Shear walls are typically light-framed or braced wooden walls with shear panels, reinforced concrete walls, reinforced masonry walls, or steel plates. 3

4. CONTD… Available shapes for shear walls are W, U, C, T, H and box sections . shear wall can be either planar, open sections, or closed sections around elevators and stair cases . In this study, main fo Study is conducted on RC framed soft storey building. 4

5. NEED FOR STUDY To determine optimum positioning of shear wall in soft storey building subjected to seismic loading 5

6. LITERATURE REVIEW AUTHOR STUDY FINDINGS Mishra et al., (2015) A Comparative Study of Different Configuration of Shear Wall Location in Soft Storey Building Subjected to Seismic Load Peripheral position of SW is best suited Intermediate configuration will be more economical Tarun et al., (2016) Optimum Position of Shear Walls in Multistorey buildings Building with Box type shear wall at center of geometry is ideal. 6 Table 1 Literature Review

7. CONTD AUTHOR STUDY FINDINGS Chandurkar et al., (2013) Seismic Analysis of RCC Building with and without Shear wall SW s provide an efficient bracing system and offer great potential for lateral load resistance Ayala et al., (2002) Review of seismic strengthening guidelines for RC buildings SW s are most effective and economic method SWs increases stiffness and lateral load strength to existing buildings. 7

8. CONTD… AUTHOR STUDY FINDINGS Anshuman et al., (2011) Solution of Shear Wall Location in Multi-storey Building top deflection was reduced and reached within the permissible deflection after providing the shear wall. Sezen et al (2003) Drift control and damage in tall buildings Buildings constructed using SWs as primary lateral load resisting system 8

9. INFERENCE FROM LITERATURE REVIEW SWs provide an efficient bracing system and offer great potential for lateral load resistance SWs are most effective and economic method 9

10. SCOPE AND OBJECTIVES SCOPE T o conduct the comparative study of different position of shear wall location in soft storey building subjected to seismic load using STAAD PRO 10

11. CONTD… OBJECTIVE To determine the optimum positioning of Shear walls How they react to seismic load To determine displacement To check storey drift 11

12. METHODOLOGY 12 Fig 1 Flow chart of methodology

13. MODELING DETAILS Type of structure - Special Moment Resisting Frame, SMRF No of bays - 5 bays (along both direction a span of 4m each) Number of stories - G +11 Storey height - floor to floor height is 3m, ground floor to first f loor height is 2.8m Beam dimension - 0.25m×0.25m Inner column dimension - 0.35m×0.35m Outer column dimension - 0.4m×0.4m Slab thickness - 0.15m 13

14. CONTD… Shear wall thickness - 0.2m Total height of the building - 32.8 Support condition - fixed Zone factor - 0.1 Importance factor - 1 Response reduction factor - 5 Rock and soil site factor - 1 Damping ratio - 5 Period in X and Z direction - 0.5 14

15. CASES USED FOR ANALYSIS Case 1 - Conventional frame or bare frame ( building without shear wall) Case 2 – Building with shear walls at core Case 3 – Building with shear wall at intermediate Case 4 – Building with shear wall at periphery 15

16. CONTD… 16 Fig 2 Plan of building with and without shear wall

17. CONTD… 17 Fig 3 Elevation of building with and without shear wall

18. CONTD… 18 Fig 4 Isometric view of building with and without shear wall

19. CONTD… 19 Fig 5 3D rendered view of building with and without shear wall

20. LOAD COMBINATIONS 1.5×(Dead load + Live load) 1.2×(Dead load + Live load ± Earthquake load) 1.5×(Dead load ± Earthquake load) 0.9Dead load ± 1.5 Earthquake load 20

21. CONTD… 21 Fig 6 Case 1 subjected to Earthquake loading in +X direction

22. CONTD… 22 Fig 7 Case 2 subjected to Earthquake loading in +X direction

23. CONTD… 23 Fig 8 Case 3 subjected to Earthquake loading in +X direction

24. CONTD… 24 Fig 9 Case 4 subjected to Earthquake loading in +X direction

25. CONTD… 25 Fig 10 Case 1 subjected to Earthquake loading in +Z direction

26. CONTD… 26 Fig 11 Case 2 subjected to Earthquake loading in +Z direction

27. CONTD… 27 Fig 12 Case 3 subjected to Earthquake loading in +Z direction

28. CONTD… 28 Fig 13 Case 4 subjected to Earthquake loading in +Z direction

29. RESULT AND DISCUSSION 29 Fig 14 Case 1 deflection due to seismic load along +X direction

30. CONTD… 30 Fig 15 Case 2 deflection due to seismic load along +X direction

31. CONTD… 31 Fig 16 Case 3 deflection due to seismic load along +X direction

32. CONTD… 32 Fig 17 Case 4 deflection due to seismic load along +X direction

33. CONTD… 33 Fig 18 Case 1 deflection value at each storey due to seismic load along +X direction

34. CONTD… 34 Fig 19 Case 2 deflection value at each storey due to seismic load along +X direction

35. CONTD… 35 Fig 20 Case 3 deflection value at each storey due to seismic load along +X direction

36. CONTD… 36 Fig 21 Case 4 deflection value at each storey due to seismic load along +X direction

37. CONTD… 37 Fig 22 Case 1 Deflection due to seismic load along +Z direction

38. CONTD… 38 Fig 23 Case 2 Deflection due to seismic load along +Z direction

39. CONTD… 39 Fig 24 Case 3 Deflection due to seismic load along +Z direction

40. CONTD… 40 Fig 25 Case 4 Deflection due to seismic load along +Z direction

41. CONTD… 41 Fig 26 Case 1 deflection value at each storey due to seismic load along +Z direction

42. CONTD… 42 Fig 27 Case 2 deflection value at each storey due to seismic load along +Z direction

43. CONTD… 43 Fig 28 Case 3 deflection value at each storey due to seismic load along +Z direction

44. CONTD… 44 Fig 29 Case 4 deflection value at each storey due to seismic load along +Z direction

45. CONTD… Height Displacement Case 1 Case 2 Case 3 Case 4 m mm mm mm mm 2.8 1.251 0.437 0.387 0.265 5.8 3.94 1.392 1.249 0.852 8.8 7.05 2.542 2.329 1.648 11.8 10.25 3.8 3.565 2.62 14.8 13.403 5.134 4.934 3.725 17.8 16.423 6.52 6.408 4.925 20.8 19.223 7.915 7.948 6.185 23.8 21.713 9.257 9.49 7.474 26.8 23.791 10.46 10.944 8.77 29.8 25.358 11.524 12.182 10.066 32.8 26.384 12.078 13.07 11.27 45 Table 2 Lateral displacements +X direction

46. CONTD… Height Displacement Case 1 Case 2 Case 3 Case 4 mm mm mm mm mm 2.8 2.573 0.898 0.795 0.545 5.8 8.1 2.862 2.569 1.751 8.8 14.566 5.227 4.788 3.388 11.8 21.072 7.812 7.329 5.386 14.8 27.556 10.556 10.143 7.659 17.8 33.763 13.404 13.175 10.125 20.8 39.521 16.272 16.34 12.715 23.8 44.639 19.031 19.511 15.365 26.8 48.91 21.505 22.5 18.03 29.8 52.136 23.488 25.044 20.695 32.8 54.243 24.831 26.871 23.17 46 Table 3 Lateral displacements +Z direction

47. CONTD… 47 Fig 30 Comparison of Displacement in +X direction

48. CONTD… 48 Fig 31 Comparison of Displacement in +Z direction

49. CONTD… Height Drift Case 1 Case 2 Case3 Case 4 mm mm mm mm mm 2.8 1.206 0.082 0.057 0.048 5.8 2.617 0.242 0.125 0.091 8.8 3.025 0.416 0.18 0.111 11.8 3.096 0.59 0.231 0.124 14.8 3.026 0.762 0.281 0.132 17.8 2.968 0.93 0.332 0.135 20.8 2.629 1.091 0.383 0.135 23.8 2.304 1.23 0.429 0.13 26.8 1.89 1.327 0.463 0.117 29.8 1.401 1.358 0.471 0.091 32.8 0.907 1.298 0.437 0.037 49 Table 4 Storey drift at each storey

50. CONTD… 50 Fig 32 Comparison of Storey drifts

51. CONTD… 51 Fig 33 Case 1 a xial force due to seismic load along +X direction

52. CONTD… 52 Fig 34 Case 2 axial force due to seismic load along +X direction

53. CONTD… 53 Fig 35 Case 3 axial force due to seismic load along +X direction

54. CONTD… 54 Fig 36 Case 4 axial force due to seismic load along +X direction

55. CONTD… 55 Fig 37 Case 1 axial force due to seismic load along +Z direction

56. CONTD… 56 Fig 38 Case 2 axial force due to seismic load along +Z direction

57. CONTD… 57 Fig 39 Case 3 axial force due to seismic load along +Z direction

58. CONTD… 58 Fig 40 Case 4 axial force due to seismic load along +Z direction

59. CONTD… 59 Fig 41 Case 1 Bending moment in X direction due to seismic load in +X direction

60. CONTD… 60 Fig 42 Case 2 Bending moment in X direction due to seismic load in +X direction

61. CONTD… 61 Fig 43 Case 3 Bending moment in X direction due to seismic load in +X direction

62. CONTD… 62 Fig 44 Case 4 Bending moment in X direction due to seismic load in +X direction

63. CONTD… 63 Fig 45 Case 1 b ending moment in X direction due to seismic load in +Z direction

64. CONTD… 64 Fig 46 Case 2 bending moment in X direction due to seismic load in +Z direction

65. CONTD… 65 Fig 47 Case 3 bending moment in X direction due to seismic load in +Z direction

66. CONTD… 66 Fig 48 Case 4 bending moment in X direction due to seismic load in +Z direction

67. CONTD… 67 Fig 49 Case 1 bending moment in Z direction due to seismic load in +X direction

68. CONTD… 68 Fig 50 Case 2 bending moment in Z direction due to seismic load in +X direction

69. CONTD… 69 Fig 51 Case 3 bending moment in Z direction due to seismic load in +X direction

70. CONTD… 70 Fig 52 Case 4 bending moment in Z direction due to seismic load in +X direction

71. CONTD… 71 Fig 53 Case 1 bending moment in Z direction due to seismic load in +Z direction

72. CONTD… 72 Fig 54 Case 2 bending moment in Z direction due to seismic load in +Z direction

73. CONTD… 73 Fig 55 Case 3 bending moment in Z direction due to seismic load in +Z direction

74. CONTD… 74 Fig 56 Case 4 bending moment in Z direction due to seismic load in +Z direction

75. CONCLUSION In all the systems, the storey drift is within the permissible limits. The lateral displacement in X-direction and Z-direction is restricted more by peripherally configured shear wall making building structure safe to shear failure. The shear wall make the structure safe by enhancing stiffness, ductility and reducing lateral and vertical drift of the storey. Apart from structural advantages shear walls are cost efficient also. 75

76. CONTD… To further increase the effectiveness of the structure, earthquake resisting techniques such as seismic dampers and base isolation can be used. That among all other possibilities, case 4 is the ideal framing technique for high rise buildings. 76

77. REFERENCE R.S.Mishra et al., (2015), “A Comparative Study of Different Configuration of Shear Wall Location in Soft Storey Building Subjected to Seismic Load” International Research Journal of Engineering and Technology (IRJET ). Tarun et al., (2016), “Optimum Position of shear walls in multistory buildings” International Journal of Trend in Research and Development, Volume 3, ISSN 2394-9333 Chandurkar et al, (2013) “Seismic Analysis of RCC Building with and without Shear wall”, International Journel of Modern Engineering3, 1805-1810 77

78. CONTD… Ayala et al., (2002 ), “Review of seismic strengthening guidelines for reinforced concrete buildings in developing countries”, Paper presented at the 12 th European Earthquake engineering conference, Barbican Centre, London. Anshumn et al., (2011), “Solution of shear wall location in Multi-storey building.” International Journal of Civil Engineering, Vol. 2 and 9, No.2, Pages 493-506. Sezen et al., (2003) “Drift control and damage in tall buildings” Engineering structure 18, 957- 966 78