Ch 6. Structures Multimedia Engineering Statics 2-D Trusses: Joints 2-D Trusses: Sections 3-D Trusses Frames and Machines
 Chapter 1. Basics 2. Vectors 3. Forces 4. Moments 5. Rigid Bodies 6. Structures 7. Centroids/Inertia 8. Internal Loads 9. Friction 10. Work & Energy Appendix Basic Math Units Sections Search eBooks Dynamics Statics Mechanics Fluids Thermodynamics Math Author(s): Kurt Gramoll ©Kurt Gramoll

 STATICS - CASE STUDY Introduction Car Driving over Bridge Dimension Diagram At the local highway department, the bridge designer is required to calculate the force in the top horizontal member of a new bridge truss. The member force is need to help determine the correct type of material and the size of the member. What is known: The car mass is 1,500 kg. The car is located at joint 2. The bridge length is 16 m (4 bays). The bridge height is 4 m. Joint 1 is a pin support, and joint 5 is a roller support. Question When the car is over joint 2, what is the force in member 6-7? Approach First, solve for the support reactions. Next, section off part of the truss and apply the three equilibrium equations:     ΣFx = 0     ΣFy = 0     ΣM = 0

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