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Int: 5 th Session: 5-2- 1 ENGINEERS MECHANICS ENGINEERS MECHANICS STATICS STATICS CHAPTER5CHAPTER5 Lecture Notes: Professor A. Salam Al-Ammri Suhad Ibraheem.

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Presentation on theme: "Int: 5 th Session: 5-2- 1 ENGINEERS MECHANICS ENGINEERS MECHANICS STATICS STATICS CHAPTER5CHAPTER5 Lecture Notes: Professor A. Salam Al-Ammri Suhad Ibraheem."— Presentation transcript:

1 Int: 5 th Session: ENGINEERS MECHANICS ENGINEERS MECHANICS STATICS STATICS CHAPTER5CHAPTER5 Lecture Notes: Professor A. Salam Al-Ammri Suhad Ibraheem Mohammed Al-Khwarizmi College of Engineering University of Baghdad Professor Dr. A.Salam Al-Ammri & Suhad Ibraheem Mohammad 2/17/2012

2 Int: 5 th Session: Contents 2/17/2012Professor Dr. A.Salam Al-Ammri & Suhad Ibraheem Mohammad

3 Int: 5 th Session: Analysis of Trusses by the Method of Joints 2/17/2012Professor Dr. A.Salam Al-Ammri & Suhad Ibraheem Mohammad

4 Int: 5 th Session: Joints Under Special Loading Conditions Forces in opposite members intersecting in two straight lines at a joint are equal. The forces in two opposite members are equal when a load is aligned with a third member. The third member force is equal to the load (including zero load). The forces in two members connected at a joint are equal if the members are aligned and zero otherwise. 2/17/2012Professor Dr. A.Salam Al-Ammri & Suhad Ibraheem Mohammad

5 Int: 5 th Session: Joints Under Special Loading Conditions 2/17/2012Professor Dr. A.Salam Al-Ammri & Suhad Ibraheem Mohammad

6 Int: 5 th Session: Sample Problem Using the method of joints, determine the force in each member of the truss. Joint A is subjected to only two unknown member forces. 2/17/2012Professor Dr. A.Salam Al-Ammri & Suhad Ibraheem Mohammad

7 Int: 5 th Session: Sample Problem Joint B joint E Joint D 2/17/2012Professor Dr. A.Salam Al-Ammri & Suhad Ibraheem Mohammad

8 Int: 5 th Session: Sample Problem All member forces and support reactions are known at joint C. However, the joint equilibrium requirements may be applied to check the results. 2/17/2012Professor Dr. A.Salam Al-Ammri & Suhad Ibraheem Mohammad

9 Int: 5 th Session: Determine the loads in each of the members by using the method of joints. Draw the free-body diagram. Joint B Sample Problem /17/2012Professor Dr. A.Salam Al-Ammri & Suhad Ibraheem Mohammad

10 Int: 5 th Session: Look at Joint D and find the angle Joint C Sample Problem /17/2012Professor Dr. A.Salam Al-Ammri & Suhad Ibraheem Mohammad

11 Int: 5 th Session: Sample Problem Determine the force in members DB, DC and BC (mention whether they are in T or C), if P1 = 240 lb and P2 = 100 lb. 2/17/2012Professor Dr. A.Salam Al-Ammri & Suhad Ibraheem Mohammad


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