Problem 4: Members AB and BC can each support a maximum compressive force of 750 lb, and members AD, DC, and BD can support a maximum tensile force of 1900 lb. If a = 7 ft, determine the greatest load P the truss can support. D.

For the truss shown below, the area of all bars is 1.8 in?; E is 30,000 kips/in? 1) determined the static determinacy of the truss 2) determine the vertical deflection at C if the truss is ONLY subjected to the force at B 2) determine the vertical deflection at C if the truss is ONLY subjected to the force P at C 3) when the truss is subjected to both forces at B and C, determine the value of the force P if the vertical deflection at C is to be zero a kips P=? 30 E 20' 20'

A scissors truss supports three forces at joints B, C, and D as shown in the figure below. The forces have magnitudes F₁ = 20 kip, F₂ = 35 kip, and F3 = 45 kip. The truss is held in equilibrium by a pin at point A and a roller at point E. Note that sides ABC, CDE, AFD, and BFE are straight lines, and member CF is vertical. Joint F lies s= 24 ft to the right and h = 8 ft above joint A, and joint C lies h = 8 ft above joint F. Use the method of joints to determine the force in each member of the truss, and indicate whether they are in tension or compression. Note: Express tension forces as positive (+) and compression forces as negative (-). A A S B F₁ F₂ F C LLM D S E OIOIO 777777 h h

The portion of the truss shown represents the upper part of a power transmission line tower. For the given loading, determine the force in each of the members located above members HJ. State whether 2. each member is in tension or compression. Ans: AB = DF = 2.29 kN T; AC = EF = 2.29 kN C; BD = 2.21 kN T; BC = DE = 0.60 kN C; BE = EH = 0; CE = 2.21 kN C; CH = EJ = 1.20 kN C %3D