## Multi-Storey Drift Example: Done by hand! (Video)

Have questions about how MASS Determines drift values? Have no fear! (and prepared to dive deep into hand calculations)   The drift calculation added to MASS Version 4.0 are used in the ductility verification as well as to check a design against inter-storey drift limits can be difficult to reproduce Read more…

## Why are different envelope curves plotted for the same Group?

For the most part, there is one envelope curve shared between storeys with the same cross section… with one exception!   We all encounter deep, philosophical questions that shake us to the very core. It has been estimated that masonry shear wall P-M Diagrams are one of the lagging causes Read more…

## Why ISN’T the Factored Shear Force Scaled up for a Seismic Design?

While you might not have expected it, MASS has it’s reasons for leaving your factored shear alone – even with earthquake loads applied   As covered in a series of posts available here, it is common for designs to be greatly affected by the additional considerations for seismic design. All Read more…

## Why is masonry shear resistance reduced for seismic effects in a shear wall design?

When Shear Resistance is Reduced, Have No Fear! Seeing the masonry component of a shear wall’s shear resistance is a part of everyday life in these uncertain times. There are three scenarios where any increased expected damage resulting from higher ductility will reduce the degree to which the masonry can Read more…

## Bonus Post: What happens when you treat a Multi-Storey Design as an Element when Increasing Factored in-Plane Shear ?

Does changing the analysis method effect the final results?   The process shown here is how MASS internally performs the analysis because the design is all done at the element level. If you are interested in how Vf,seismic is determined having only the information for one element available, this page Read more…

## Checking Vf,seismic for a Shear Wall Element

Taking seismic effects into account in MASS can be confusing. Seeing factored shear forces scaled up by over 100% in some cases may seem larger than expected. The main post found here outlines the clauses being invoked here where the requirements are broken down into two parts: (a) and (b). Read more…

## Why is the Factored Shear Force Scaled up on a Shear Wall Design?

Explaining these clauses and how they are applied   Questions about the seismic effects on shear resistance? Click here for a separate post. This page covers the scaling up of seismic forces applied to the wall. You may have noticed after running a few designs in the newly released MASS Read more…

## Checking Vf,seismic for a Multi-Storey Shear Wall

Taking seismic effects into account in MASS can be confusing. Seeing factored shear forces scaled up by over 100% in some cases may seem larger than expected. The main post found here outlines the clauses being invoked here where the requirements are broken down into two parts: A and B. Read more…