tutorial(20&23th April)

tutorial(20&23th April) - Problem 9.2-3 The...

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Unformatted text preview: Problem 9.2-3 The deflection curve for a cantilever beam AB (see figure) is given by the following equation: 2 v = — JUL—(top — 10sz + 5m — x3) 1201.5! Describe the load acting on the beam. Probe. 9.2-3 and 9.2-4 Solution 9.2-3 Cantilever beam (1013—10sz + 51.3 —x3) Take four consecutive derivatives and obtain: an ._ _fl ._ v LEI“ x} From Eq. (9-12c): q= —Efv’”' =qo(l —£) 4— The load is a downward triangular load of maximum intensity qcr 4— Problem 9.3-9 Derive the equation of the deflection curve for a simple beam AB loaded by a couple M0 at the left-hand support (see figure). Also. determine the maximum def] ection M0 6“. (Note: Use the second—order differential equation of the G deflection curve.) Solution 9.3-9 Simple beam (couple MO) BENDINGvMOMENT aoumon (Bo. 9-12a) Mammm DEFLECTION n .. 3 _ i I = _£ 2 _ 51v —M M00 L) it “flat. 6Lx+3x1) : I} s l ' = 0 d 1 r - Eh =Ma(x__2z)+cl 1: VL 1 anvgove orx. = — — 4—. x2 x3 ‘1 ( 3 ) 51v =Mo(—- --)+ C.x + C2 2 61- Substitute xl into the equation for v: 3.0 v(0} = D C2 = i} MDL 3m 2 _ (v):_xl as. v(L] = 0 C, = -—-— = .M'JL .— 3 9V§El Mo": 6 LE! [These results agree with Case 7. Thble G-2.) v= (2L1—3Lx+x2) — Fraulein 9.3-12 The beam shown in the figure has a roller support at A and a guided support at B. The guided support permits vertical movement but no rotation. Derive the equation of the deflection curve and determine the deflection 55 at end 3 due to the uniform load of intensity q. (Note.- Use the second-order differential equation of the deflecti on curve.) Solution 9.3-12 Béam with a guided support - REACTIONS AND DEFLECI'ION CURVE BENDING-MOMENT EQUATION (EQ. 9—123) qxz Elv" = M = qu — 7 quz qxj a: ' — — — — + 2 6 C1 L3 3 c m) = 0 C1 = 5’? qu’ go: (11.31 E! = — — — — — + v 6 24 3 C2 4x 3 = m — + 4— v 24E:(3L 4-sz r") SqL‘ 5 =— L = 4— “ ( ) 24E] Problem 9.4-5 The distributed load acting on a cantilever beam AB has an intensity 9 given by the expression go cos 17x {213. where go is the maximum intensity of the load (see figure). Derive the equation of the deflection curve, and then determine the deflection 53 at die free end. Use the fourth-order differential equation of the deflection curve (the load equation]. Solution 9.4-5 Cantilever beam (cosine load) LOAD EQUA‘I'ION (EQ. 9-12 B) 3.0. 3 v'{0) = 0 C1 = 0 17x 4 2 En." = —q = —qn cos— = _ E qoLxs — qoL :2 21. u Elv 4., 1? cos 2L + 3” n + C; M _ ' m Elv - -qo(:) SIRE + C, 16%;} 3.12.4 v(0) =0 c4: 4 11' L BvC-l EN” = V Elvmm =0 Cl=2q1: 90" (48 3 m‘ 48 3 379m: 1913) = — L —— L + — ‘— 2 2 v MAE! cosm- 2L mt anx Elv” = qo(—) 005— + + C2 ‘ 7r 2,; L w a, = —v{L) = 24" (a? — 24) 4— 3716‘s: 29013 {These results agnse with Case 10. Table G- 1.) 34:. 2 En!" =M EIv"(L) =0 C2 = - fl 2L 17x grub?" _ 2%sz 3 Elv' = 1.1.4?) Sing + n 1r 4- C3 ...
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