NEW 375 Lecture08(2) - Statically Indeterminate problems...

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Unformatted text preview: Statically Indeterminate problems Given: Cross-section Areas: Modulus of Elasticity EXAMPLE PROBLEM 1. BEHAVIOR OF A REINFORCED CONCRETE COLUMN UNDER AXIAL LOADING 2 2 2 1 . 20 3 . 4 4 . 24 in A in A in A A A Con St Ccon St g = = = + = psi E psi E Con St 6 7 10 3 10 9 . 2 = = Cross- section FIND: Con St Con St P P , , EXAMPLE cross-section STEP 1: FORCE and EQUIBRIUM ? ? 50 = = = = Con St P P k F P St P St P Con P Con P = + = + Con St P P P + = Con St P P + = 50 (Eq.1) NOTE:Two unknowns STEP 2: DEFORMATION / GEOMETRY OF FIT Con St = = ASSUMING NO SLIDE BETWEEN CONCRETE AND STEEL BARS, THEY ARE SUBJECTED TO COMPRESSION SIMULTANEOUSLY . THEREFORE (Eq. 2) STEP 3: APPLY FORCE-DEFORMATION RELATIONSHIP: Con Con St St EA PL EA PL = = = Con Con Con Con St St St St A E L P A E L P = 3 30 1 . 20 3 . 4 Con St P P (Eq....
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NEW 375 Lecture08(2) - Statically Indeterminate problems...

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