Question

Problem 10.22 Consider the frame shown in (Figure 1). Assume the supports at A and B are fixed. EI is constant. Part A Determine the internal end moment MAD acting on member AD of the frame at A measured clockwise. Express your answer to three significant figures and include the appropriate units. Enter positive value if the moment is clockwise and negative value if the moment is con μΑ ? MAD = 73.6 kNm Submit Previous Answers Request Answer X Incorrect; Try Again; One attempt remaining Part B Determine the internal end moment MDA acting on member AD of the frame at D measured clockwise. Express your answer to three significant figures and include the appropriate units. Enter positive value if the moment is clockwise and negative value if the moment is cou Figure < 1 of 1 > НА ? D MpA= -9.2 KN.m 3 m Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining 30 kN/m 3 m Part
I know the answer to A is -25.9 from the answer I requested

Answer 1

I think you did mistake in writing the answer of part A. I checked from moment distribution also the answer is -15.9 instead -25.9 as mentioned.

3면 8 30kNm ㄴ 3m solving by slope deflection method MfiAn = - Wl? 20 30x32 13. SKN - 20 MA DA = WL 30x 3 30 9 KN-m 30 Mfoc Myco Mfce = Mfec = 0 We know M DA + Moc=0 .. (1) and Mcot Me =0 .. (ii) Mon = Mfoa + 2E프(200+9a - ) PI MOA = 9 + 4E49. { e. Seo 3 Moc = Mfoc + 트프 (200 + 3 Moc = 4 EIO +2 EI Oc 뜰 3 Putting in is Q EI S. + 2 ETS. - - 2 7 ... (ii)

Meo= Ma co + 2 61 (20.+00 36 ) ८ Mco Y EI Oc + 2/3 EIO. 3 E CB Mfcet 2EI ( 20c + OB - 38 ) 3 McB = 4 EI Oc {09-S=0} 3 Putting in rio SEIO + 2 EIO, (10:0 Solving (in & rin we get OC - 0.9 EI 00=-3-6 ET : Partai MAD = MFAD +2E1 (200+ Oo) E = -13.5 + 2 EI | 0 + 3.6 EI = -13.5 -2.4 -159 knom Part B: Moas 9+ 4EI (-32) 3 - 4.2 knom

Post C. - () + (-) 204 Moc 3. 51 3 Port D: WN T (-) 을 + () J W Mco=YEI EI PortE: 게 Mcg = 4 El () K3 Part fi MBC 2 EL (29st ) - Ce = o laim ६