RBL Balaji

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    Comparative study on seismicparameters of RCC building based on

    Force based and Displacement baseddesign.Department of Civil Engineering

    School of Mechanical and Building Sciences

    VIT UniversityChennai Campus

     guide

    Dr. I.YAMINISRIVALLI

    Presentation by,

    N. BALAJI

    (1MS!1"#$%

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      CONTENT

    • INTRODUCTION

    • O!"ECTI#E

    • $ET%ODO&O'(

    • RE)U&T)

    • REFERENCE)

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    INTRODUCTION

    • In force based design T*e structure +asdesigned up to yield during t*e design ofeart*,ua-e t*e elastic part of t*e

    response up to yield only e/amined.• %o+ever t*e real displacements of t*e

    structure is un-no+n

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    •  0*ere as in displacement based design t*e realdeformation of eac* member of t*e structure+as e/amined t*ere are t+o approac*es to dot*e displacement based design.

    •  One is design from t*e beginning of t*estructure for a certain displacement. T*e designdisplacement +as usually determined byultimate capacity consideration.

    • )econd is c*ec- of an already pre designedstructure and ma-e improvements only tomember t*at *ave problem.

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     Ob1ective

    •  T*e main ob1ective of t*e study +asto compare t*e parameters of forcebased and displacement based

    design.

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    METHODOLOGY Revie of literature

    Study of displacement !ased

    design

    "inding !ase shear and displacement ductility

    demand for column displacement !ased

    design#

    Design of multi$storey frame

     !y force !ased method#

    Study of force !ased design

    Multi$storey frame as %nalysed

     !y e&uivalent static response

    spectrum method using ST%%D

    'R(#

    "inal report

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    Force based design

    • In design '23 store building +asmodelled using staad pro and t*eanalysis and design carried out

    separately for static loads 4D&2&&5 andstatic plus dynamic loads4D&2&&2E65. byta-ing 7one factor as 8.9: and 7one III

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    )T;;D $ODE&

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    Reinforcement details

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    Displacement based design

    • In displacement based design t*e structure+ill be designed as ta-ing real displacementsof structure under service condition

     • Initially t*e structure +as analysed by using

    response spectrum met*od after t*atma/imum forces and displacements of eac*

    storey are noted. From t*at t*e displacementsof individual mass are given by

      < = yi > 4yc?/c5

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    Results

    Forces(F)(KN)

    Displacements( ȳ )(mm)

    1.4 8

    !.1! @AB

    11." A

    1!.#$ @9

    1.1! 3B

    $.$1 99A@

    %.1 9BA@

    #1.!" 9B

    ##.&1 9B

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    8 @88 A88 :88 88 9888 9@88 9A88

    8

    988

    @88

    B88

    A88

    88

    :88

     

     T*e grap* is plotted bet+een force4/a/is5 and displacementis on 4ya/is5

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    •  T*e base s*ear calculation

    Fbase=-e >yd=B@.@ -N

    •  T*e displacement ductility demand for t*estructure is

      G= yd?y=9.9A@

    0*ere yd is t*e design displacement and y ist*e yield displacement.

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    conclusion

    • !y considering t*e results it *as beenconcluded t*at. t*e design is safe and +e-no+ t*e real displacements of t*e

    structure from t*is +e can calculate eac*store design force in terms of base s*eartotal displacement design +ill be done inne/t p*ase

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    References

    9.Nigel priestley et al displacementbased seismic design .europeansc*ool for advanced studies inreduction of seismic ris-paviaitaly.

    @.'.$.Calvi$.".N.priestley and$.".Ho+als-y Displacement basedseismic design of structure

    IU))pavia italy nort* carlinastate university

    B. Ra-es*-.goelcalifornia polytec*nic

    state universitysan luis obispo andanil -.c*o ra universit of california

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