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VIS Concrete Design Program – Shear at Frame Members

By vis In Videos

02

Nov
2020

Frame Shear – VIS can do Strength and Capacity Design for all columns and beams, applying all code requirements for both the normal and seismic conditions. 

Compliance with all code detailing provisions is also checked. 

Compliance with all code detailing provisions is also checked. Furthermore, if your ductility class is H, joint panels at beam-column intersections are designed and checked.

This video is about shear design in frame elements. Wall elements are dealt with in a separate video.

VIS looks at shear from different design perspectives: strength, capacity, and code detailing. The procedures are simple and straight forward.

If you want to do design, select a beam, click on Strength and then Shear Design…. Here you can see the minimum areas of required reinforcing along with the various beam segments. This is based on beam internal forces as resulting from analysis and considering the pertaining load combinations.

Next click on Capacity and then Shear Design.

Same thing, but from the capacity point of view. Shear reinforcing is provided, based on the theoretical shear forces balancing out the resisting moments of the beam end sections. These shear forces are increased by a factor determined by the ductility class.

Of course, to activate the Capacity functions, first, you must have longitudinal reinforcing already assigned. Columns? Same thing.

An axial force is included in the calculations to account for increased shear capacity. Ok. Now say you have already designed the beam and assigned some reinforcing and want to check it. Just follow the same procedure as before, clicking on the Check buttons instead. In place of required areas, you get Demand/Capacity ratios at the various segments along the beam.

Finally, click on Detailing Provisions and them Frame Check. Compliance with all code detailing provisions is checked and comprehensive explanations are offered.

Doing Detailing Provisions, you not only check transverse reinforcing for shear, but also for the many other requirements where this reinforcing is needed. From providing restraint to compression rebars to meeting confinement obligations in critical regions.

If your ductility class is H, you can also check shear capacity of joint panels at beam-column intersections. Just select the joint and click on Capacity and Joint Design or Joint Check and you get all the required results.

Shear design is performed based on the strut and tie method as outlined by code. Go to General Settings, click on General and select the Shear tab. As you see, you can select the type of shear truss mechanism. Either variable or fixed angle. The default is variable. If you choose fixed, you can experiment with different angles and see how the results are affected. 

  • Read more in our blog

If you would like to know more about VIS

Contact us on info@vis-concretedesign.com, or see our youtube channel.

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