Question

In modern building, there are more than one structural element involve. That include, beam, column, trusses, cable, etc. All of the element are important to be analyse so that it stable and safe to be used Identify truss system in a building nearby you and sketch it into free body diagram. Analyse the system by identifying the support location and type. You are free to assume the load and the length of the system. Identify load for 3 members of your choose and specify if the member in compression, or tension. (CO2-PO1-C3) Example of real truss and free body diagram. Figure 1: Real truss system sketch to free body diagram

Answer 1

Consider above roof truss.

Draw the free Body diagram of truss. 30kn 2oka 10KN 2oka lok loko lokn 30 6251 الا کے ۔ "Ay Take a. a. section x-x to solce forca in member MN, ME and EF Due to symmetry, the reaction forca are Eqreal at supports, hency Ay = By = [10+10+20+367.20 +10+10] -55 ko Find angle, o tand - 2.89 0CF 105 MF = 2.89 m = 38 Find the angle, tan'a 62.579 २.89 105

take a section x- Loka 10kn loka 1 TME Te 18 TEF Ay eingeim 1.5 Find the distance NE MF २.४१ 3.5 5 5 NE = 0.023 m. Take moment about E ZM6=0 1o **s)] (Ay X 305) -(10 x 2.5) - 10 x105) +(TMN COSO) (NE) 55x3.5-40+(Imo cos 38 ](2.023]:=0 TmN=810045 IN (Tersion)

vatical equilibrium, Fy- Tma sino & TMG San Bt Ag 87.045 sin 38 + Tre Sin 62-57 +55 - 10-10-20 TME = -58052 KN ME = 58.52 ko (compressive] Horizontal Equilibrium & Fx=0 Tmn caso + TME Sling + TER=0 87.045 (as 38 - 58.52 sin 62.57 + TFF Ter= - 23.44 KN TEF = 23.44 kN (compresice]

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