Ch 6 Lecture Notes updated 4_22_07

Ch 6 Lecture Notes updated 4_22_07 - FRAMES AND MACHINES:...

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Chapter 6: Truss and Frame: Definitions and Loading Characteristics TRUSS: DEFINITION A structure made of a number of bars connected at their extrimities is said to form a truss Examples Loading and Force Characteristics If we neglect the weights of the bars and external loadings are at the joints, each bar is a two-force member i.e., reactions at the ends are equal and opposite, and along the direction of the bar
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Force Type on Bar: Tensile and Compressive Tensile Bar Stretches Compressive Bar Shortens Load Distribution in Bars: Various Methods Entire Truss Method of Joints Method of Sections Problem Ax=0, Ay=500N, Ey=700N
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FRAME : DEFINITION If at least one bar is connected at a point other than ends of another bar, the structure is said to be a FRAME EXAMPLE Differences in Force Characteristics between a TRUSS and FRAME All truss members are two-force members unless loads or weights act at points inside a bar All frame members are not two-force members. The reactions at the joints may have components normal to the connecting bars
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Unformatted text preview: FRAMES AND MACHINES: APPLICATIONS These internal structures are not trusses since the linkages are not two-force members ANALYZING A TRUCK AND TRAILER AS A FRAME ANALYZING A MACHINE Solution Flowchart Problem 6.13 Continued Problem 6.13 Continued Problem 6.13 Continued BC 2 kN(T) T 1 kN(C) BE T = = -Solution Solution Flowchart Solution Flowchart Use Method of Sections to Find Axial Forces in Members BD, CD and CE Problem 6.41 Continued Problem 6.83 Continued Solution FBD of the LHS of Section shown Equations of Equilibrium Solution Problem 6.98 Continued Total Number of Unknowns = 9 Total Number of Equations = 9 Problem is solvable Note that BD is a Two-Force Member Sectional FBDs Problem 6.103 Continued FBD of Entire Frame Solution Flowchart Problem 6.103 Continued Final Solution: Load Distribution on Link ABC FBD of Weight W s e c t i o n FBD of Body Below the section shown Problem 6.80 continued. . Problem 6.80 continued. ....
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Ch 6 Lecture Notes updated 4_22_07 - FRAMES AND MACHINES:...

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