TB-Lecture18-Post-tensioning-Concrete-Slabs

TB-Lecture18-Post-tensioning-Concrete-Slabs - EGN-5439 The...

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Unformatted text preview: EGN-5439 The Design of Tall Buildings EGN Lecture #18 Post-tensioned Concrete Slabs Basic Concepts Conventionally Reinforced Structures Versus Post-Tensioned Concrete Structures "( ) * ( * ( + + & + ** ! " $ # %& ' # "( ) * ( * ( + + & + ** + ,( ( -*/ . , / 0 1 ! % 2 3 "( ) * ( * ( + + & + ** / 4 4 % 2 5 $# % 6 * & % % ! "( ) * ( * ( + + & + ** / . , 1 & 7 5 "( ) * ( * ( + + & + ** PRESTRESSING 1928 Eugene Freyssinet (France) PRE-TENSIONING HOYER (German Eng.) (1938) POST-TENSIONING FREYSSINET Steel is tensioned prior to casting of the concrete Steel strands are tensioned after concrete has been cast "( ) * ( * ( + + & + ** "( 8* ( " * ) * + +48: 9 * : $: IN THE LAST DECADE 1990-2000 65% PRE-TENSION (PRECAST) 35% POST-TENSION PRETENSIONING PRETENSIONING ! ! ! POST-TENSIONING POST # " " $ ! ! ! ! ! ! % ! "( ) * ( * ( + + & + ** 8* ( " * ) 13% HOLLOW CORE SLAB 37% ARCHITECTURAL ELEMENTS * + +48: 9 * : $: 20% BRIDGES 30% STRUCTURAL MEMBERS 25% BRIDGES 7% EARTH WORK RETAINING STRUCTURES 8% NUCLEAR AND TANKS 60% BUILDINGS ( )' ' " '% ; ' ' %% '' "( ) * ( * ( + + & + ** ! # " / & . < / / = "( ) * ( * ( + + & + ** "( # $ $ %$ " > &, ? ,, ?> 3" ) : :: :: : > &, ? > , : > " ) :: : : :? : , >7&, ? >@, : > " ) :: : : :? : , # ( # , %. A & / B&, ? B,, ? > " ) :: : :: , % A #A A= A% ' : A "( ) * ( * ( + + & + ** & .= ' (# C >C 2 '; ! ( '! .= 9 6 %% . ) + -' . *, $ / 2C < % +/ ," "( ) * ( * ( + + & + ** "( 0 # 1 D ( ; 2 $ .: : @$ 5 : 7$ "( ) * ( * ( + + & + ** "( !' ! -$ / " M Demand M Resisting Results of structural analysis EQUILIBRIUM EQUATIONS STRAIN COMPATIBILITY MATERIAL STRENGTH vDemand vProvided 00 $ #$ ; # 3$ #$ E " " 2 ? # 1 2 $ #$ 2 E " " 2 ? 2 2 2 # 2 21 B #$ 4 '& $ $% 2 E " " 1 2 1 B % # 2 ? 2 2 2 # 2 %! E " " 1 2 1 B ? # 2 0 ? 0 0# 5 * F * , $& $+ . . + E8 $, + ( & (* 00 0 0 " ( 8* 6 " * & &- * + *& + 9 +( 0 0# 5 * F * , $& $+ . . + E8 $, + ( & (* 00 0 0 " ( 8* 6 " * & &- * + *& + 9 +( # 6 5 0 # # # # 7 80 0 07 7 7 %2 1 7 # 0 0 EXTRUSION PROCESS USED TO PRODUCE UNBONDED SINGLE STRAND TENDONS 0 0 + 0 0 9 ...
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This note was uploaded on 08/29/2011 for the course CES 4600 taught by Professor Staff during the Fall '08 term at FIU.

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