To use the method of joints to solve for the forces in a truss. The truss shown in (Figure 1) is subjected to a force PPP = 240 NN and has dimensions L1 = 1.8 mm and L2 = 3.6 mm . Part A Part complete Since all of the joints have more than two unknowns, begin by finding a support reaction. What is the vertical reaction at C? Let a positive force act up. Express your answer to three significant figures with appropriate units. Part B Part complete Now joint CC has two unknowns. Use the equilibrium of joint CC to calculate the force in CDCD. Use a negative sign to indicate compression. Express your answer to three significant figures with appropriate units. Part C Part complete Use the equilibrium of joint CC to calculate the force in BCBC. Use a negative sign to indicate compression. Express your answer to three significant figures with appropriate units. Part D Part complete Use the equilibrium of joint B to calculate the force in BD. Use a negative sign to indicate compression. Express your answer to three significant figures with appropriate units. Part E Part complete Use the equilibrium of joint B to calculate the force in AB. Use a negative sign to indicate compression. Express your answer to three significant figures with appropriate units. Part F Use the equilibrium of joint D to calculate the force in AD. Use a negative sign to indicate compression. Express your answer to three significant figures with appropriate units.

Steel Design (Activate Learning with these NEW titles from Engineering!)

6th Edition

ISBN:9781337094740

Author:Segui, William T.

Publisher:Segui, William T.

Chapter3: Tension Members

Section: Chapter Questions

Problem 3.3.1P

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Learning Goal:

To use the method of joints to solve for the forces in a truss.

The truss shown in (Figure 1) is subjected to a force PPP = 240 NN and has dimensions L1 = 1.8 mm and L2 = 3.6 mm .

Part A

Part complete

Since all of the joints have more than two unknowns, begin by finding a support reaction. What is the vertical reaction at C? Let a positive force act up.