The tensile strain in steel is less than 0.004 Increase the cross section size of the member so that more steel can be placed, or lower the minimum area of steel requirement in the Model Settings.
However, the cross section size, and the rebar spacing and cover requirements prevent enough rebar from being placed to meet that area of steel requirement.
Unable to provide min steel (As,min) per Model Settings.Ī minimum area of steel was specified in the Model Settings. For a T-beam member in RISA-3D seeing negative bending, the flanges will be ignored. Otherwise, change the beam to be non-composite. Modify the beam's end releases to be pinned, or eliminate a midspan support under the beam. RISA cannot perform a composite design when the slab is in tension. This resulted in a negative bending moment on the beam, which would place the concrete slab in tension. The composite beam has fixed ends, or passes as a continuous member over a support.
Increase the span to a length greater than 1 foot, or ignore design of this member in this short segment.Ĭomposite design not done : Beam is continuous. When a member spans less than 1 foot from support to support then the program cannot perform this design. RISA uses span information to perform concrete member design and rebar optimization. Revise the user defined reinforcement so that it is present at all locations along the member's length. This message means that a user defined reinforcement profile has resulted in a member with zero capacity (and zero reinforcement) at the described location.
See if a code revision now provides guidance on checking web buckling for Tubes, Channels, or WT shapes. The current design code does not address web buckling as a failure state for shapes other than Wide Flange Members. Web Buckling NOT checked for Shear Capacity.īritish Hot Rolled Steel Design has been requested for a Hot Rolled Steel HHS Tube, Channel, or WT shape that has a very slender web. Here is a table containing all possible warnings, the cause, and possible solutions: Warning Number Type in Search keywords: Sum of Reactions. Having a combination of a rigid diaphragm, rigid links, rigid end offsets, top of member offsets, etc., all in a localized place in the model could cause these.įor additional advice on this topic, please see the RISA Tips & Tricks webpage at /post/support. In this rare case forces may be leaving the model at locations other than boundary conditions.