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Mechanics Of Materials - (3Rd Ed , By Beer, Johnston, & Dewolf) Episode 8

Tham khảo tài liệu 'mechanics of materials - (3rd ed , by beer, johnston, & dewolf) episode 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | PROBLEM 5.77 5.77 and 5.78 For the beam and loading shown design the cross section of the beam knowing that the grade of timber used has an allowable normal stress of 1.75 ksi. SOLUTION c vf Cd CC o .J p iVCtl.S r 3.t kifj 6evutinA fnotnC i a Ma r- 2X8. 7.2 ld -H c.4 kp.i - IỉíIeìỉ - ÍG1 _ u 1-Ị n r ụĩ-37 FcmT Ỡ. SijfOctV e Sđeiìớh S M a - 7 s a - tóY ơ.37 - 6.C7 in. PROBLEM 5.78 5.77 and 5.78 For the beam and loading shown design the cross section of the beam knowing that the grade of timber used has an allowable normal stress of 1.75 ksi. SOLUTION Co s4 r-UC f .slneair A lad r a oi aeH Ý GUKVeC. Mmw 2.S- k.p.f 30 kip. in. CaM k Q . - 3 -T - I7aI4S in Om In LTẨ - in s f bha 4t 2tY 4b - 17. Hl b3 3V N31 r 35._ b 2.V in. I I IJ n ị n i u n I J I n ị D Ũ 1 I n I u Í . Ĩ 9ĨĨ X be m a d loading shown design the cross section of the beam knowing that the grade of timber used has an allowable normal stress of 12 Mpa PROBLEM 5.79 SOLUTION o Me o -Í.H A 4 ô.GX3.cyX er o ỌMa o - 8.ỔX3 24 8 o V UM K -27 kW 8 -8.1 KU Shear A 2.7 kv v - 2.7 -l.skv --4.5 1 8. I - 3.6 VhJ X 3.6- 1.2X3 - o Voc 4e T taAeze V - o 277-aJ S-H QỈ Ỡ. Hn Z4- d - l.s ArecuS 0n 4ar cưrơe A D - i o. Ya.7 - 1.2 5 kU-hH 8 - iXusX-W v -3.375 kKb 8 h c iXl. 3.6 r 2. 16 ÍỐM. kH Ồen lln no o r ts - Mạ o Mo Ồ 4 .21 - - .2 5 bJ- i Mb- 1.2 5-3.375 - -2 6 A M-Ki Me - -2.U 4 2. Ỉ4 - o 1m I - 2.16 ku hq 2. 6 lo u h 12 MPa M O pq. S - r - l8ox o- 80X10 X jt 34 4io 3- ioh L lSo 1 - I8OX O3 ife 18 Is o J X TP and S0 For the beam and loading shown design the cross section of the beam knowing that the grade of timber used has an allowable normal stress of 12 MPa. PROBLEM 5.80 VCW M SOLUTION B c B c 2.5 2. S - 3 K Q o o. s kN Slnftftif A o B V zs kN va zs G.S 9 kN Ve 9 - Í3XCÌ - -V fcv - 9 Areas ư ocler skea diagram A oB SvJx Ồ.Ê cXsV i.S kU-hn 8 K E SVJhc iVvsy r i.7m E o c Sv4y - - 6 7S kM-K-1 c -H D s VUy r - I. s MA - o Ms c o 4 I.S T I.s kkAwi Me I S 6-7S - 5.26 kN Hn Me - S.2S-6.7S - ks kM-nn l.s-us o Mayỉ J IM - 3. .