MD MUSTAKHEEM AHMED.ppt

DEPARTMENT OF CIVIL ENGINEERING VEERAPPA NISTY COLLEGE OF ENGINEERING Design and investigation of hishrise structures WHEN IT IS BRACED WITH SHEAR WALL AND SOFT STOREY AT DIFFERENT LEVEL BY PERFORMING RESPONSE SPECTRUM ANALYSIS AND TIME HISTORY. Under the Guidance of; PRESENTED BY PROF LOKESH .g Md mustakheem ahmed (USN: 3VN18CSE07) ( asst. professor and coordinator dept of structural engg) 1

OVERVIEW  INTRODUCTION  OBJECTIVES  LITERATURE REVIEW  METHODOLOGY  RESULTS & DISCUSSION  CONCLUSIONS  FUTURE WORK 2

INTRODUCTION  We are growing in a physical modern era, where the development business has been driving over numerous different perspectives. As the time has advanced different building technique has been used to make structure more immense.  Now a days because of the height and seismic zone element the designers have to take care of lateral masses which includes earthquake and wind forces.  This structures which has to sustain the action of Gravity loadings and the dynamic loadings has to be designed in such a way that it will be not fragile or brittle that they fail under the action of low intensity of earthquakes. The earthquakes are the major cause of destruction for human life & property. These Earthquakes are caused due to the predominate shaking of ground , which in turn release a large amount of strain energy producing different types of waves which in turn effect the stability of the structure. . 3

 On the other hand, the movement of the ground during the earthquake is cyclic The Earthquake effects impacts are due to the Path of load distributed , source of Earthquake generated and site conditions .  When the height of building increases the sway or lateral displacement increases which causes additional forces in the members.  In this present study a concrete building is studied with the introduction of shear walls and soft storey under the action of seismic forces. 4

SHEAR WALL AND SOFT STOREY  Shear wall is a structural member in a reinforced concrete framed structure to withstand lateral forces which include wind forces. Shear partitions are commonly used in high-rise buildings impacted to lateral wind and seismic forces. A soft story building is multi –storey building in which one or more floors have windows wide doors large unobstructed commercial spaces ,or other openings in places where shear would normally be required for stability as a matter of earthquake soft storey's are generally used for parking spaces 5

Location of Shear Walls in a Building Shear wall at corner Shear wall in Y direction The shape and plan role of the shear wall affects the conduct of the structure significantly and Structurally, the excellent position for the shear walls is within the centre of every half of the structure. This is rarely practical, so they can be positioned at the corners also. 6

OBJECIVES OF THE STUDY  To perform analysis on G+15 story building & determine the behavior of RC framed multistory building  Adopting different locations of SW and studying the structural behavior  Adopting SW and CW to analysis the effect of the loading on structure. 7

 Performing analysis by removing infill walls and making it a soft storey on different storey to identify the behavior.  Studying the comparative results by performing ESM, RSA, THA methods.  Identifying the Time period , Base Shear , Storey Drift & Displacement of the structure. 8

LITERATURE REVIEW  ANIL BARAL 2012 Anil Baral has conducted a case study on the seismic response of RC framed Structure for different Shear wall position , under his study he has performed analysis on a RC framed Structure G+9 under the seismic zone V. In his model a multistoried 10 floor building , he as adopted shear wall in different position , like L shaped & I shaped and has added a core wall at Center for lift core .  P.P CHANDRUKAR P. P. Chandrukar has conducted a case study on the seismic response of RC framed Structure with and without Shear wall , under his study he has performed analysis on a RC framed Structure G+9 under the seismic zone iv . In his model a multistoried 10 floor building , he as adopted shear wall in shorter span which In turn tends to be a economical for this structure . 9

METHODOLOGY PLAN DETAILS For this study a G+15 storey building each storey of height 3.5 m is modeled. The structure is designed as per Indian Standard code of practice for seismic resistance design of building. The structure is modeled using ETABS 2017, 08 different models were prepared having at different levels under the action of seismic loading. 10

 General DESIGN DATA  Plan dimensions  No. of storeys : 22 x 24.5m  Grade of concrete : G+15 : M-40 for columns  Grade of reinforcement M-30 for beams, slabs  Size of columns : Fy-500  Size of beams : 300 X 1500 mm,300x1200  Slab thickness : 300 X 600 mm  Storey height : 150 mm  Shear wall : 3.35 m : 300 mm thick 11

 Earthquake Parameters :4 (As per IS1893-2016) : 1.2 : 5(SMRF) 1) EQ zone : Rigid 2) Importance factor 3) Response reduction factor : 3 KN/sq m 4) Diaphragm : 1.5 KN/sq m : 15.675 KN/sq m  Loading Parameters (As per IS 875-part 2) 1) Live Load 2) Floor Finish 3) Wall Load 12

MODEL DESCRIPTION MODEL-1 MODEL-2  REGULAR MODEL  REGULAR MODEL WITH SHEAR WALL AT CORNERS It is a basic model with 15 storey's in this model infill masonry is considered & This model has a shear wall at corner shear analysis has been performed by Etabs ( walls are provided in L type direction with dynamic analysis) the subtraction of columns and beams. RENDER VIEW PLAN 13

MODEL-3 MODEL-4 This model comprises of further Model 4 is as similar to that of 3rd model modification with respect to the model 2 except the shear walls are provided in Y which includes termination of all the columns direction. which includes termination of that lies in direction all the columns that lies in Y direction eliminated with respective to the regular model. 14

MODEL-5 MODEL-6 model with shear wall at corner and core wall This model has a soft storey's from story 1 at center which includes termination of all the to story 3 in order to provide parking in columns that exist in the corner as well as at building. Soft story is that in which all beams loads nothing but wall loads are eliminated the centre 15

MODEL-7 MODEL-8 In this model infilled with masonry framed Model 8 is as similar to that of seventh model where storey 3,4,5 has been considered as soft except the shear walls are provided in corners stoerys and have performed direction. in this model Infilled with masonry frame & Soft storey has been considered on different alternate storeys & Shear wall are also been used and have been Performed by Etabs (Dynamic analysis) . 16

RESULTS AND DISCUSSIONS  BASE SHEAR  TIME PERIOD  STOREY DISPLACEMENT  STOREY DRIFT 17

BASE SHEAR BASE SHEAR(KN) EQUIVALENT TIME HISTORY RESPONSE ANALYSIS SPECTRUM M.NO STATIC ANALYSIS METHOD UX UY UX UY UX UY 6533.587 1 4032.75 6354.1 4032.62 6533.976 4029.675 5 2 6529.88 9449.3 6529.66 9449.49 6529.474 9015.16 6515.102 3 7234.77 6515.1 6080.95 6190.37 7235.789 9 4 4271.6 10036 4271.53 10035.84 4272.601 10036 5 8376.1 11773 27169.785 13584.89 8376.099 11773 5537.664 6 3501.02 5995.7 1943.48 5495.58 3501.069 7 7 3444.63 5440.9 3443.28 5440.938 31206.83 44921.28 8 6656.84 7113.7 3328.25 3556.769 6656.849 7113.724 18

TIME PERIOD TIME PERIOD 3.5 3 MODEL EQUIVALE TIME RESPONSE EQUIVALENT NO NT STATIC HISTORY SPECTRUM 2.5 STATIC METHOD ANALYSIS ANALYSIS 2 METHOD 1 2.67 2.78 2.892 1.5 TIME HISTORY 2 1.724 1.724 1.724 1 ANALYSIS 3 2.429 2.429 2.429 4 1.322 1.322 1.322 0.5 RESPONSE 5 1.252 1.245 1.245 0 SPECTRUM 6 2.643 2.743 2.743 12345678 ANALYSIS 7 2.42 2.42 2.334 8 1.269 1.269 1.269 19

STOREY DISPLACEMENT STOREY DISPLACEMENT (MM) MODLE1 ESM THM RSM STOREY UX UY UX UY UX UY 16 15 51.503 36.872 67.049 95.557 47.554 10.996 14 13 50.419 35.745 65.671 93.243 46.668 10.742 12 11 48.773 34.331 60.916 90.272 45.383 10.412 10 9 46.614 32.600 63.875 86.540 43.711 9.996 8 7 44.010 30.567 61.557 82.048 41.684 9.495 6 5 41.030 28.269 58.690 76.839 39.333 8.916 4 3 37.738 25.745 55.276 70.973 36.684 8.264 2 1 34.195 23.040 51.332 64.517 33.759 7.547 BASE 30.457 20.195 46.887 57.818 30.578 6.767 26.575 17.252 41.983 50.643 27.159 5.931 22.594 14.252 36.669 43.038 23.516 5.042 18.555 11.235 31.006 35.088 19.662 4.105 14.497 8.255 25.070 26.894 15.610 3.128 10.451 5.387 90.467 18.606 11.381 2.129 6.417 2.767 56.982 10.467 6.991 1.148 1.939 0.676 14.904 9.904 2.083 0.291 0.000 0.000 0.000 0.000 0.000 0.000 20

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STOREY DRIFT STOREY DRIFT (MM) MODE ESM THM RSM L1 UX UY UX UY UX UY 22 STORE Y 0.0003 0.0003 0.0003 0.0006 0.0003 0.0003 16 0.0005 0.0004 0.0005 0.0008 0.0005 0.0004 15 0.0006 0.0005 0.0006 0.0010 0.0006 0.0005 14 0.0008 0.0006 0.0008 0.0011 0.0007 0.0006 13 0.0009 0.0007 0.0009 0.0013 0.0008 0.0006 12 0.0010 0.0008 0.0010 0.0014 0.0009 0.0007 11 0.0011 0.0008 0.0011 0.0015 0.0010 0.0007 10 0.0011 0.0008 0.0011 0.0015 0.0010 0.0007 9 0.0012 0.0009 0.0012 0.0016 0.0011 0.0008 8 0.0012 0.0009 0.0012 0.0016 0.0011 0.0008 7 0.0012 0.0009 0.0012 0.0016 0.0012 0.0008 6 0.0012 0.0009 0.0012 0.0016 0.0012 0.0008 5 0.0012 0.0009 0.0012 0.0016 0.0013 0.0008 4 0.0012 0.0008 0.0012 0.0015 0.0013 0.0008 3 0.0013 0.0006 0.0013 0.0015 0.0015 0.0006 2 0.0008 0.0003 0.0008 0.0006 0.0008 0.0003 1 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 BASE

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CONCLUSIONS  Time History Analysis and Response Spectrum Analysis method have been selected and there information and diagrams have been plotted previously.  The storey displacement was found to be more at model 6 as compared to that of other models  The storey drift mainly for the structure is observed to be much less at the top and bottom and barely will increase at middle of the structure  The time period was found to be more as compared to equivalent static method which consist of response spectrum analysis which was found to be 2.89 seconds  Base shear is high in case of earthquake due to zone 4 and severe seismic conditions  The seismic condition of a structure in x direction is more critical in model 2 &3 as the corner columns in y direction is removed  Provision of shear wall is relatively more efficient in case of the seismic forces 24

FUTURE WORK  Additional study can be carried out by using different Terrain categories.  Different zone factors can also be used to performed further seismic analysis.  Further analysis can be done by using shear walls at distinctive places in a structure.  Use of core walls at desired locations in building can be further carried out. 25