HW%202%20solution - CE4401 Fall 2009 Homework #2 Due...

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Unformatted text preview: CE4401 Fall 2009 Homework #2 Due Wednesday September 23 Show all of your work for all calculations. Itemize from where in the AISC Manual or Specification you are getting your data (especially the more obscure data relating to clearances and spacings). This is important: it must be clear what you are doing and why. Use short statements to describe your work where helpful. Note: for calculations, always use the decimal tabulated dimensions of the sections, not their nominal or fractional dimensions. 1. The connection shown below is used at the ends of a 20’ tension member. What is the design strength of this tension member? For fracture on net area, check all possible failure patterns. Does this member meet the serviceability requirements? Assume A572/50 steel (Grade 50, Fy= 50 ksi, E, = 65 ksi) and 0.75” A325 HSS bolts. e —— Q Q O Q j ér O O O 0 % g P —— Pu O 0 o O ‘1 e L8x4xl/2 channel i i i i i i s = 2.5" = Bolt pitch . L5 = 1.5" = Distance from centroid of bolt hole to sheared end g = 2.25" = Bolt gage e = 1.5" tf = Thickness of angle Not to scale 2. For the truss shown below, design tension members 1, 3, and 7. Use the following maximum factored forces (note that all 3 members are NOT controlled by the same load combination, also note that these loads are different than the results from HWl). Member # Maximum Factored Force gkipsz Governing Load Combination l 172 Load Case 3 3 51 ., Load Case 2 7 81 Load Case 2 Design Criteria: Use A572/50 steel, Fy = 50 ksi, E, = 65 ksi. Assume the members will be welded together with longitudinal welds only Use double angles only. Assume the members are connected by a 3/8” thick gusset plate. Assume the price of fabricated steel is $3.00/lb. Determine the total minimum cost (i.e., minimum weight) of the three tension members specified below from this truss. Be sure to specify if the angle are placed long or short legs back to back if you use a double angle with unequal legs. Include a check for the L/r serviceability limit state and determine if fillers are required. If so, indicate where they should be placed 7/97 (1) i @ i @ i @ //O// V Pt F2 % H———4@16'=64’—————>§' Problem 3. The frame shown is unbraced against sidesway. Assume that all columns are Wl4x6l and that all girders are W21x68. All columns are oriented in the strong axis bending in the frame Find the effective length factors for columns GF GH, and EF. E E E i as?) E E S i E E i i E E E E E E E E i i i E E E E i E § § 3 t“ % g § i i g E g g E i i 3 E LEM i, K mm L a i: ._ 3 m .f 1% F» a 3 My 5 a. T: M» .sww f3 E/g/ mfg/Ema my? MW , 9: VA, W ‘3? 7.? «4» 2w (3, 59 a m m f D 3 L .M M??? 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HW%202%20solution - CE4401 Fall 2009 Homework #2 Due...

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