The document discusses reasons for sway in portal frames, including eccentric or unsymmetrical loading, unsymmetrical shape of the frame, different end conditions of columns, non-uniform member sections, horizontal loading on columns, settlement of supports, and combinations of these factors. It also describes using shear equations to evaluate joint moment or sway, which is an additional unknown for portal frames with sway. General and shear equations for different cases of portal frames with sway are presented.

1. SNS COLLEGE OF ENGINEERING
Kurumbapalayam (Po), Coimbatore – 641 107
An Autonomous Institution
Accredited by NBA – AICTE and Accredited by NAAC – UGC with ‘A’ Grade
Approved by AICTE, New Delhi & Affiliated to Anna University, Chennai
DEPARTMENT OF CIVIL ENGINEERING
COURSE NAME: CE8502 – STRUCTURAL ANALYSIS I
III YEAR/V SEMESTER
Unit 2 – Slope Deflection Method
Topic 6 : Portal Frames with Sway

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SNSCE/ Civil Engg /V sem / Shanmugasundaram N/ Ap/Civil
Reasons for Sway in portal frame
1. Eccentric or unsymmetrical loading.
2. Unsymmetrical shape of the frame.
3. Different end conditions of columns of the portal frame.
4. Non – uniform section of the member of the frame.
5. Horizontal loading on the column of the frame.
6. Settlement of the supports of the frame.
7. A combination of the above.

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1.Eccentric or unsymmetrical loading

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2.Unsymmetrical shape of the frame

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3.Different end conditions of columns

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4.Non – uniform section of the member

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5.Horizontal loading on the column of the frame

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6.Settlement of the supports of the frame

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7.A combination of the above.
The amount of joint moment or sway is not
known and forms an additional unknown.
Shear equation is used to evaluate the
additional unknown.

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General Equation Case 1

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General Equation Case 1
.

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General Equation Case 1

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Shear Equation Case 2

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Shear Equation Case 3

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Shear Equation Case 4

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Shear Equation Case 4

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