Engineering Mechanics - Statics Episode 2 Part 3 ppsx

Engineering Mechanics - Statics Chapter 6The Pratt bridge truss is subjected to the loading shown.. Engineering Mechanics - Statics Chapter 6Determine the force in members CD, CJ, KJ, an

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Determine the force in each member of the truss and state if the members are in tension or

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Engineering Mechanics - Statics Chapter 6

Positvive means Tension, Negative means Compression

− 0 0

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− 6.69 3.46

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Joint I F2 + ( FGI FCI + − FAI ) cos ( ) θ = 0

FHI FBI − +(FGI FAI − − FCI)sin ( ) θ = 0

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− 0

− 2.15

− 8.08

The Howe bridge truss is subjected to the loading shown Determine the force in members DE,

EH, and HG, and state if the members are in tension or compression.

Units Used:

kN = 10 3 N

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The Pratt bridge truss is subjected to the loading shown Determine the force in members LD,

LK, CD, and KD, and state if the members are in tension or compression.

Units Used:

kN = 10 3 N

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− 112.5 50

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Problem 6-32

The Pratt bridge truss is subjected to the loading shown Determine the force in members JI,

JE, and DE, and state if the members are in tension or compression.

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− 75

The roof truss supports the vertical loading shown Determine the force in members BC, CK,

and KJ and state if these members are in tension or compression.

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Determine the force in members CD, CJ, KJ, and DJ of the truss which serves to support the

deck of a bridge State if these members are in tension or compression.

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− 0 9.375

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Determine the force in members EI and JI of the truss which serves to support the deck of a

bridge State if these members are in tension or compression.

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− 0

Determine the force developed in members GB and GF of the bridge truss and state if these

members are in tension or compression.

Given:

F1 = 600 lb

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− 0 8.49

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Determine the force in members IC and CG of the truss and state if these members are in tension

or compression Also, indicate all zero-force members.

By inspection of joints B, D, H and I.

AB, BC, CD, DE, HI, and GI are all zero-force members.

− 9 5.625

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By inspection of joints B, D, H and I.

AB, BC, CD, DE, HI, and GI are all zero-force members.

− 5.625

Determine the force in members BC, HC, and HG After the truss is sectioned use a single

equation of equilibrium for the calculation of each force State if these members are in tension

or compression.

Units Used:

kN = 10 3 N

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Problem 6-43

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− 3.207 6.8

− 9.155 9.155

Determine the force in members OE, LE, and LK of the Baltimore truss and state if the

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⎜⎝ ⎞⎟ ⎟⎠

1.5 2

F2

− ( ) a − F3 2a ( ) − F4 3a ( ) + Ey 4a ( ) = 0

( ) Solution:

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− 1 2

Determine the force in members KJ, JN, and CD, and state if the members are in tension or

compression Also indicate all zero-force members.

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F a b

2 +

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FBG = 1 kN Initial Guesses

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− 1.803 8

The skewed truss carries the load shown Determine the force in members CB, BE, and EF

and state if these members are in tension or compression Assume that all joints are pinned.

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Determine the force developed in members BC and CH of the roof truss and state if the

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Determine the force in members CD

and GF of the truss and state if the

members are in tension or

compression Also indicate all

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Determine the force in members DE, DL,

and ML of the roof truss and state if the

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Ay F1 − − F2 − F3 + FDE sin ( ) θ − FDL sin ( ) φ = 0

FML FDL cos + ( ) φ + FDE cos ( ) θ = 0

− 3.8

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− 142

Determine the force in each member of the space truss and state if the members are in tension or

compression.The truss is supported by short links at B, C, and D.

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− 175

− 25 79.1

Determine the force in each member of the space truss and state if the members are in tension

or compression.The truss is supported by short links at A, B, and C.

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Positive (T) Negative (C)

− 0 667 300

− 0

− 786 391

− 0

The space truss is supported by a

ball-and-socket joint at D and short

links at C and E Determine the

force in each member and state if

the members are in tension or

compression.

Given:

F1

0 0 500

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0 0

b

− 0

− 0 0 266.667

− 500

− 0

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