Bridge Truss problem I (simple truss) Moments Principles of EngineeringTM Unit 4 – Lesson 4.1 - Statics Bridge Truss problem I (simple truss) Problem: A 10,000-lb load is carried by the bridge truss as shown. What is the weight being carried at either end (i.e. at ‘A’ and ‘D’) Draw the reaction forces at A and D Choose A as the pivot point. Use ΣM = 0 to solve the reaction force at D. Then use ΣFY = 0 to solve the reaction force at A. B 18 ft A D 24 ft C 44 ft Fc = 10,000. lbs

Bridge Truss problem II (cantilever) Moments Principles of EngineeringTM Unit 4 – Lesson 4.1 - Statics Bridge Truss problem II (cantilever) Problem: A 10,000-lb load is carried by the cantilevered truss as shown. What is the weight being carried at ‘A’ and ‘C’? Draw the reaction forces at A and C Choose A as the pivot point. Use ΣM = 0 to solve the reaction force at C. Then use ΣFY = 0 to solve the reaction force at A. B 18 ft A D 24 ft C 44 ft FD = 10,000. lbs