r = 7, n = 2, 7 > 6. Statically indeterminate to the first degree. (a) Ans. r = 9, n = 3,9 = 9. Statically determinate. (b) Ans. r = 10, n = 2, 10 > 6. Statically indeterminate to the fourth degree. Ans. (c) r= 9, n = 3, 9 = 9. (d) Statically determinate. Ans. Fig. 2–21

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A:

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A:

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A:

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Q: 1) (5 pts) =1", r=1" 3" 1.5" 1.2"

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Q: A W B

A:

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A: Degree of indeterminacy  Di = R - E Di = 4 - 3 = 1 Hence , option (d) will be correct answer.

Equilibrium and Support Reactions

Civil engineers deal with structures that are composed of several members connected or with individual members such as beams and columns. To analyze such structures, the condition of statics must be applied. Under the static condition, the members are considered to be in equilibrium under the action of forces, that is, the members are assumed to be having negligible velocity.