The bars ACE and BCD are supported by a pin and slot arrangement at C. ACE is supported by a pin at A, and bar BCD is fixed to the ground at B. а. Draw a FBD of the bar ACE. Determine all support reactions at A, and determine the slot reaction at C. b. Draw a FBD of bar BCD, and determine all the support reactions at B. l0lb ft M = ISo dbft = Soeb 3 ft ft 3 ft A 4 ft 4 ft ......Y...... C ---..Y......

The structure shown below is a simplified tower crane. It carries a shipping crate suspended from B that has a weight of 116 kN . The main jib DCB (in green) has a weight of 17 kN concentrated in the center of the beam. This is pinned to the main body at D and is supported by a cable that is routed through pulleys at F and G and is attached to a concrete counterweight J. The main body AEFG (in yellow) is fixed to the ground at A.   Various geometry: h1= 26.5 m h2= 3.9 m h3= 5.1 m l1= 12.8 m l2= 17 m l3= 4.3 mm θ= 57.6 degrees   Assumptions :  The main body AEFG can be considered massless. The cable CFGJ is massless. The pulleys at F and G can be considered massless, frictionless, and of negligible diameter. All bodies are considered rigid.   Questions:  Determine the weight of counterweight J in order for the main jib DCB to be horizontal. Determine the magnitude of the x and y components of force at pin D. Determine the reactions at fixed support A.

Determine the reactions at supports A and B. As part of your solution draw a complete Free Body Diagram. Note that the roller at B is placed on an inclined plane.

Do not round off intermediate values when using them to solve subsequent values; however, they may be written up to 4 decimal places in the answer sheets. Final answers should be rounded off up to 4 DECIMAL PLACES. Box the final answers.