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{live-template:Test Problem}

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When a simply supported (pin-pin) [frame|kb:Frame] object is insertedmodeled with a top -center or bottom -center insertion point, the program generates internal [constraints|kb:constraint] thatare generated essentiallywhich have the effect of verticallya offsettingvertical theoffset. frameA inkinematic theresult modelof thatthis ismodeling usedtechnique foris analysisthe asgeneration illustratedof inlongitudinal figureforces below. This results in longitudinal force acting which act on an arm about the neutral axis of the section. ThisIf isthis kinematically correct behavior. If this is not thedesired, desiredusers behavior,may changingchange one support from a pin to a roller willcondition givesuch youthat zero horizontal reactions and zero moments at the supportsare released.

SimilarThis behavior canmay be observedexhibited alsowhen for [bridge objects|kb:bridge modeler] that are supported by [bearing links|kb:link] located at the bottom of the bridge girders.

Visuals depicting how standard and offset elements 1). are illustrated in the software interface; 2). are kinematically related to the analytical model; and 3). respond under flexural loading are presented in Figure 1:

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!fig 1 - pined beam with top center and bottom center insertion points.png|align=center,border=1,hspace=30px!

The screenshot below illustrates this behavior for the attached model.!

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

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The images from Figure 1, as they appear in [SAP2000|sap2000:home], are given in Figure 2:

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!fig 2 - general view, reactions and moments.png|hspace=30pxalign=center,border=1!

{center-text}Figure 2 - Images as they appear in SAP2000{center-text}


h1. See alsoAlso

* [Verification Example 1-011 |doc:Verification examples]
1-011

h1. Attachments

* [SAP2000 V14.2.3Model Model|Effect of insertion point on beam reactions^model A V14.2.3.zip] (Zippedzipped SDB file)