400 A W 12x72 steel column is subjected to a load of 300 kips as shown below. Determine the following: 1. Compression stress developed in the column. 2. Bearing stress between steel base plate and concrete footing. 3. Bearing stress between the concrete footing base and the soil. 4. Total shortening of the column (E=30,000 ksi). L=10' "6- י7 18" 18" W 12x72 7'-6" 16"
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- An elevated jogging track is supported at intervals by a wood beam AB (L = 7.5 ft) that is pinned at A and supported by steel rod BC and a steel washer at B. Both the rod (dBC= 3/16 in.) and the washer (dB= 1.0 in.) were designed using a rod tension force of TBC=415 lb. The rod was sized using a factor of safely of 3 against reaching the ultimate stress tru— 60 ksi. An allowable bearing stress sba= 565 psi was used to size the washer at B. A small platform HF is suspended below a section of the elevated track to support some mechanical and electrical equipment. The equipment load is uniform load q = 50 lb/ft and concentrated load WE= 175 lb at mid-span of beam HF. The plan is to drill a hole through beam ABaX £land install the same rod (dBC) and washer) dB) at both D and F to support beam HF. (a) Use s and to check the proposed design for rod DF and washer d,: are they acceptable? (b) Re-check the normal tensile stress in rod BC and bearing stress at 8 if either is inadequate under the additional load from platform HF. Re-design them to meet the original design criteria.If a solid circular rod having an initial diameter D = 0.03 m and initial length L = 0.8 m, is subjected to a tensile force F = 300 kN, the new diameter will be: Given: The rod is made of steel having Young's modulus E = 200 Gpa and a Poisson's ratio = 0.3. Select one: a. Df= 2.993 mm Ob. Df = 10.92 mm Oc. Df= 3.007 mm Od. Df = 30.02 mm Oe. Df = 29.98 mma=2.1m (1) c = 2m b = 3.1m d = 1.8m P = 80 kN WHAT IS THE AXIAL STRESS IN ROD 1 ? ANSWER IN MPa ROUNDED-OFF TO 2 DECIMAL PLACES B dia. of rod 1: = 13mm dia of rod 2 = 11 mm
- The steel column has an outer diameter of 4 in. and inner diameter of 3.5 in. is carrying a load P = 59000 Ibs. The column is separated from the concrete foundation by a 2-in. thick of square bearing plate. Determine the 4 in 3.5 in a. compressive stress of the column in psi. b. bearing stress of the concrete in psi c. punching shear of the steel plate in psi. 7 in.b=3.1m a=2.1m (1) B C = 2m P = 80kN C d = 1.8m WHAT IS THE AXIAL STRESS IN ROD 1 ? ANSWER IN MPa ROUNDED-OFF TO 2 DECIMAL PLACES dia of rod 1 = 13mm dia of rod 2 = 11 mm3. A steel bolt and nut are tightened around an aluminum sleeve. Find the internal forces as the nut is rotated 1 turn (1 turn = 1.5 mm) given the cross sectional areas and the moduli of elasticity for the steel and the aluminum. AST = 150 mm? EST = 200 GPa EAL = 70 GPa AAL = 100 mm? L=150 mm AST Final 1.5 mm Position Al
- 1. A solid square rod is cantilevered at one end. The rod is 0.8 m long and supports a completely reversing transverse load at the other end of 50 kN. The material is AISI 1060 hot-rolled steel (?? =370 MPa,?? =680 MPa ). Use a design factor of 2 and determine the dimensions of the square cross section for the following cases. Neglect any stress concentration. a. The rod must support this load for 100 cycles. b. The rod must support this load for 104 cycles. c. The rod must have infinite life.(CLO 1, 2)Determine the stress in the Aluminum rod (Psi) after the load 68 (kips) is applied. The light rigid bar ABCD is pinned at B and connected to two vertical rods. Assuming that the bar was initially horizontal and the rods stress-free. Steel L= 3 ft A = 0.5 in? E = 29 x 10° psi 4 ft B C D Aluminum L= 4 ft A = 0.75 in? E = 10 x 10° psi 2 ft 2 ft → O a =48335 O b. =41535 Oc =55135 O d. =67375 O e =56155 O f. =57855 Og =53775 Oh =61935The wood column is pinned at its base and top. Take E= 10 GPa and or = 15 MPa. (Figure 1) Figure 150 mm" 25 mm 25 mm 75 mm 75 mm 1 of 1 Part A If the eccentric force P = 11.8 kN is applied to the column, determine the maximum normal stress. Express your answer to three significant figures and include the appropriate units. TIGB = Submit Part B Value Request Answer Submit Units If the eccentric force P = 11.8 kN is applied to the column, investigate whether the column is adequate to support this loading without buckling or yielding. ? O The column is adequate to support this loading without buckling or yielding. O The column is inadequate to support this loading without buckling or yielding. Request Answer
- The composite bar is firmly attached to unyielding supports. Compute the stress in steel caused by the application of the axial load P =40 kips. Express your final answer in ksi and use two decimal places. Aluminum A = 1.25 in.2 E = 10 × 10° psi Steel A = 2.0 in.2 E = 29 × 106 psi 15 in.- 12 in.-Question 38 What is the total length of bar mark 01 Use S1 - 250 mm. Size of column is 300 x 300 mm 02 01 6.2 m 02 LJ4 S1 L/2 THE 03 -Column -04 L = 5m SUPPORT MIDSPAN 4mm 250 mm 250 m OF 120 mm 40 n 120m 400 0-10 mn dn, 10 rm da stimups 2 58,4 100, rest 200 n S10mn dia, 10 mm di srups 2a 5a, 100, est 200 mn O B840 mm O NONE DF THE CHICES O 13240 nm O 2500 mm10/10 find the tensile stress in upper plate in section 3-3 5. 1 4 80 kN 80 kN 8-bolt DIA. 10 MM 80 kN 80 kN 8-bolt DIA. 10 MM 2) 300 mm 8 mm