ANALYSIS AND DESIGN OF REINFORCED CONCRETE ... - IJIRT

1 May2016| IJIRT | Volume2 Issue 12| ISSN: 2349-6002 IJIRT143639 INTERNATIONAL JOURNAL OF INNOVATIVE RESEARCH IN TECHNOLOGY360 ANALYSIS AND DESIGN OF REINFORCEDCONCRETE RECTANGULAR SHEAR , Gokul2, Krishna3, of Civil Engineering, Dhanekula Institute ofEngineering & Technology,Vijayawada 521139, Andhra PradeshAbstract:-: Earthquakes are the most criticalloading condition for all land based structureslocated in the seismically active regions. A recentearthquake in India on January 26th, 2001 causedconsiderable damage to a large number of RCChigh-rise buildings andtremendous loss of life.

2 Thereasons were (a) most of the buildings had soft andweak ground storey that provided open space forparking, (b) poor quality of CONCRETE in columns, and(c) poor detailing of the structural DESIGN . Therefore,this incident hasshown that designers and structuralengineers should ensure to offer adequateearthquake resistant provisions with regard toplanning, DESIGN and detailing in high rise buildingsto withstand the effect of an earthquake. As anearthquake resistant system,the use of shear walls isone of the potential options. The use of shear wall-buildings is quite common in some earthquake proneregions.

3 shear walls majorly resist the seismic force,wind forces and even can be build on soils of weakbases by adopting various ground words: Earthquake; Shear Wall; Seismic forces;Structural DESIGN ; INTRODUCTIONS hear walls are vertical elements of the horizontalforce resisting system. shear walls are constructed tocounter the effects of lateral load acting on a residential construction , shear walls are straightexternal walls that typically form a box whichprovides all of the lateral support for the shear walls are designed and constructedproperly, and theywill have the strength and stiffness to resist thehorizontal forces caused by wind, earthquake, anduneven settlement loads, in addition to the weight ofstructure and occupants; create powerful twisting(torsion) forces.

4 These forces can literally tear (shear)a building apart. shear walls are especially importantin high-rise buildings subjected to lateral wind andseismic 1. Rectangular Shear WallSince shear walls carry large horizontalearthquakeforces, the overturning effects on them are large. Thus, DESIGN of their foundations requires special walls should be provided along preferably bothlength and width. However, if they are provided alongonly one direction, a proper grid of beams and columnsin the vertical plane (called a moment-resistant frame)must be provided along the other direction to resiststrong earthquake G+5 Storey Office Building with shear walls isconsidered as shown in table below:Table 1.

5 Dimensions & Parameters ConsideredParametersDimensionsStorey mTotal Building Height (H) mFloor Area37 = Of Wall () mShear Wall And Slab Thickness250 mmColumn And Beam Size350 350 mmMaterialsM 30 & Fe 415 Number Of Shear Walls2 May2016| IJIRT | Volume2 Issue 12| ISSN: 2349-6002 IJIRT143639 INTERNATIONAL JOURNAL OF INNOVATIVE RESEARCH IN TECHNOLOGY361 Fig. 2: Office Building Plan and Column PlanII. DESIGN PARAMETERS (AS PER IS1893:2002)Building is situated in zone factor, Z = factor, I = reduction factor, R=3 Table 2: Lateral forces and shear shows the bar chart with gradual increase inLateral forces from bottom floor to top 3: Lateral Forces on Each shows the bar chart with gradual increase inShear forces from top floor to bottom 4: Shear Forces on Each StoreyIII DESIGN OFRECTANGULAR SHEAR WALLFOR AN OFFICE BUILDINGB ending moment and shear force:Two shear walls are provided in the problem to resistthe seismic forces in each 3.

6 Factored Shear Force & Bending Moment05001000150020001st2nd3rd4th5th6th roofweightLateral forces0100020003000400050001st2nd3rd4th5 th6thShear forcesFloorWeight() (kN)Height(m)(x106) DESIGN lateralforce (kN)Shear(kN) May2016| IJIRT | Volume2 Issue 12| ISSN: 2349-6002 IJIRT143639 INTERNATIONAL JOURNAL OF INNOVATIVE RESEARCH IN TECHNOLOGY362 Factored shear force (Vu) KNFactored bending moment(Mu) KNmFactored axial KNMoment of resistance (Mu) KNmProvide 9 # 20 mm diameter bars @ 450 mm c/c in thevertical direction in two for shear:Factored shear force (Vu) = KNNominal shear stress () = = KN/m2 DESIGN shear stress = KN/m2 Nominal shear stress () > DESIGN shear stress( c)Hence, horizontal reinforcement needs to be 44 # 20 mm diameter bars @ 450 mm c/c inthe horizontal direction in two : Reinforcement Detailing for Shear WallIV.

7 ANALYSIS OF RECTANGULAR SHEARWALL USING STAAD-PROThe shear wall is analysed in staad-pro. Fig 6 showinggeometric Structure of a (G+5) building in anisometric : Isometric View of Structure in supports are assigned and property is assignedto the a property means to providedimensions such as width, thickness etc to beams Columns Shear wall Slabs etc. May2016| IJIRT | Volume2 Issue 12| ISSN: 2349-6002 IJIRT143639 INTERNATIONAL JOURNAL OF INNOVATIVE RESEARCH IN TECHNOLOGY363 Fig. 7: Property to Beams and : Surface Thickness to Shear WallAssigning loads and seismic parameters to the loads are given along Y rangeMinimum: m;Maximum: mFig.

8 9: Assigning of Floor LoadsEarthquake loads are assigned to the structure in X andZ directions and CONCRETE DESIGN is done for beams : DESIGN of : DESIGN of ColumnsThe shear wall is designed as per IS code provisions. May2016| IJIRT | Volume2 Issue 12| ISSN: 2349-6002 IJIRT143639 INTERNATIONAL JOURNAL OF INNOVATIVE RESEARCH IN : Shear Wall DesignV. RESULTSDEFLECTION:Deflection along X-direction:As per IS: 456 CODE, the maximum deflection shouldnot exceed H/500. Here H / 500 = 21150/500 = maximum deflection obtained is mmwhich is less than it is safe fromdeflectionalong : Deflection along :Deflection along Z-directionDeflection along Z-direction:As per IS 456:2000 CODE the maximum deflectionshould not exceed H / 500 = 21150/500 = mmThe maximumdeflection obtained is mmwhich is less than it is safe fromdeflection along SHAPES:A mode shape is a specific patternofvibrationexecuted by a mechanical system at aspecificfrequency.

9 Different mode shapes will beassociated with different : Mode Shape 1 in Dead Load Condition May2016| IJIRT | Volume2 Issue 12| ISSN: 2349-6002 IJIRT143639 INTERNATIONAL JOURNAL OF INNOVATIVE RESEARCH IN : Mode Shape 2 inDead Load : Mode Shape 3 in Dead Load : Von-Mises StressSTRESS:Maximum stress is obtained at the bottom ofthe stress is obtained at thetop ofthe structure Refer in SCOPE FOR THE FUTURE WORKS hear walls are considered to be a gift to the futureconstruction industry. It s since their arrival in marketthere topic was always a topic of interest. Shear wallsare the structures usually build to balance lateral loadsacting on the structure.

10 Where the lateral loads aremost predominantly wind and earth quake loads. Andpredominantly earthquake loads are more intense intheir effect on the building structures. Earthquakes arebecoming more intense due to the key reason that isground water displacement. Hence in order toovercome the diverse effects of earthquake it s alwaysbest to save ourselves from future other subjects related to this research havebeen identified that it needs further and analytical research works neededlater are summarized below. More research works should be done to finda better way to simulate the behaviour ofshear walls under cyclic loads.