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Default modeling procedures locate object boundary conditions along the centroid of the cross section. When a simply supported (pin-pin)

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frame

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object

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is

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modeled

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with

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a

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top-center

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or

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bottom-center

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insertion

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point,

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internal

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constraints

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are

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generated

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which

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have

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the

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effect

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of

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a

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vertical

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offset.

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A

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kinematic

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result

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of

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this

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modeling

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technique

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is

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the

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generation

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of

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longitudinal

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forces

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which

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act

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on

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an

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arm

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about

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the

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neutral

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axis.

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If

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this

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behavior

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is

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not

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desired,

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one

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support

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may be changed from

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a

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pin

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to

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a

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roller

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condition

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such

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that

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horizontal

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reactions

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are

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released.

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This

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behavior

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may

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be

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exhibited

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when

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bridge

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objects

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are

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supported

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by

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bearing

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links

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located

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at

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the

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bottom

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of

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the

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bridge

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girders.

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Presented in Figure 1 are visuals which depict how standard and offset objects:

  • Are displayed in the software interface.

  • Are kinematically related to the analytical model.

  • Respond under flexural loading.

Image Added

Figure 1 - Simply-supported beam with center and bottom-center insertion points



The images from Figure 1, as they appear in SAP2000, are given in Figure 2:

Image Added

Figure 2 - Images as they appear in SAP2000

See Also

Attachments

Metadata

  • Name: Effect of insertion point on beam reactions

  • Description: How insertion point affects horizontal reactions and flexural response of a simply supported beam.

  • Program: SAP2000

  • Program Version: 14.2.3

  • Model ID: 96