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Structures 2 > Structural Continuity > Flashcards

Structural Continuity Flashcards

1
Q

Why do beams that are continuous over multiple supports require a different method of analysis than single span simply supported beams?

A

They are statically indeterminate (simply supported beams are statically determinate)

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2
Q

In multiple span continuous beams, will load in one span produce stress the other spans?

A

Yes

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3
Q

What does the deflection method for indeterminate beams actually solve?

A

The center reaction

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4
Q

What generally is the sign of the interior reaction moment found in a continuous beam? (assume gravity loads)

A

negative

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5
Q

The beam shown to the right is:
______________________
/`/\``````/\

A

Statically indeterminate

Continuous over two spans

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6
Q

Which of the loading patterns shown below will yield the largest NEGATIVE moment for the center of middle span of the 5-Span continuous beam?

A.
_LL\_\_\_\_\_LL\_\_\_\_\_\_LL_
DL_DL_DL_DL_DL_DL_
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
/\`````/\``````/\``````/\``````/\``````/\
B.
\_\_\_\_LL\_\_\_\_\_\_LL\_\_\_\_\_
DL_DL_DL_DL_DL_DL_
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
/\`````/\``````/\``````/\``````/\``````/\
C.
\_\_\_\_\_\_\_\_LL\_\_\_\_\_\_\_\_\_
DL_DL_DL_DL_DL_DL_
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
/\`````/\``````/\``````/\``````/\``````/\
D.
_LL\_\_\_\_\_LL\_\_LL\_\_\_\_\_\_
DL_DL_DL_DL_DL_DL_
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
/\`````/\``````/\``````/\``````/\``````/\
A

B

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7
Q

If a continuous beam over two spans carries a distributed load that causes a positive moment within each span, what is the sign of the moment at the interior support?

A

Negative

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8
Q

Why would a continuous beam over multiple supports require less material than a series of simply supported beams to support the same load?

A

The overall maximum moment is smaller

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9
Q

In the Three Moment Theorem equation, where are the slope components located in the two spans?

A

They are located on the rignt side of the first span and on the left side of the second span.

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10
Q

What makes continuous beams statically indeterminate?

A

Continuous beams having 3 or more supports will have 4 or more reactions which is more than can be solved with the 3 equations of static equilibrium.

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11
Q

The “deflection method” to solve two continuous spans has what limitations in application?

A

It applies only to symmetric spans with symmetric loads

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12
Q

What method of analysis can be used for continuous beams of two unequal spans with asymmetrical loading?

A

Either the slope method or the three-moment method

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13
Q

What method of analysis can be used for a continuous beam of any number
of spans?

A

Three-moment method

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14
Q

Which method of analysis should be used in order to determine all reacting forces for a continuous beam involving more than a two-span condition?

A

The Three-Moment Theorem

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15
Q

Why is the analysis of a two-hinged frame different from that of a three hinged frame?

A

The removal of the third hinge makes the two-hinged frame statically indeterminate.

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16
Q

Beside continuous beams, what is another example of a statically indeterminate structure?

A

Two hinge frame

17
Q

In a ridged frame system, will flexure in a beam have any effect on a column?

A

Yes

18
Q

How many continuous spans can be solved with the 3-moment equation?

A

Any number, but it requires an additional equation for every additional span

19
Q

In solving indeterminate beams, what does the slope method actually solve for?

A

The slope method solves for the moment at the middle support.

20
Q

In the “deflection method” does the solution vary depending on E or I?

A

No

21
Q

Will a multiple span beam, with gravity loads, always contain both negative and positive moments?

A

yes

22
Q

What was the cause of the oscillation on the Millennia Bridge in London?

A

The synchronous movement of the pedestrians caused by the oscillation
of the bridge

23
Q

In comparing the two frames with identical dimensions and loading, which would
have the higher maximum moment: a 3-hinged arch or a ridged frame?

A

3-hinged arch

24
Q

In a continuous beam, what is the point of contraflexure?

A

A point on the beam between the upward and downward curvature
Also a point of zero moment

25
Q

What is the value of the moment at the point of contraflexure?

A

zero

26
Q

For a single span beam with both ends fixed, where is the moment the greatest?

A

At the support

27
Q

In using the 3-moment equation to solve continuous span beams, how are the
support reactions determined?

A

By constructing FBDs of each span

Structures 2 (10 decks)

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