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The following are some of the limitations or features not supported with curved members: Tapered section propertiesComposite decksPRIS ROUND sections Beta angleMember releases, global or tangentMember SpringsMember offsetsMember end springsPhysical membersMember Tension/compression Any span loads except "Uniform load throughout the length in global directions", such as: Member Loads - UMOM, CON, CMOM, LIN, TRAPArea Load, One Way, Floor LoadWind Load, Prestress, PoststressTemperature load, StrainFixed End LoadSnow LoadMoving load ImperfectionsGeometric stiffness, Pdelta, buckling, Pdelta KG with/without dynamicsMass for dynamics will not include the effect of the member cg being off the chord lineIntermediate section displacements, and hence the deflection diagramIntermediate section forces, and hence the bending moment and other forces diagram
Steel or concrete design at any location other than nodesMember selectionWeld design
*Limitations faced with curved beams in designing:
It is not advisable to perform steel design on curved members using STAAD. The reasons are :
Due to all these limitations, modeling the curved beams using a series of straight segments might be a better option.