I am scheduled to give a talk in August about the shear capacity of concrete columns in regards to the AASHTO 400 kip vehicle collision load. So of course this lead me to revisit the “Modified Field Theory for Calculating Shear Strength of Reinforced Concrete Elements” which is the basis for most of the beta/theta factors in the new code.
In that paper there is a note about a software package called Response-2000. Quoting the website,
Response-2000 is an easy to use sectional analysis program that will calculate the strength and ductility of a reinforced concrete cross-section subjected to shear, moment, and axial load. All three loads are considered simultaneously to find the full load-deformation response using the latest research based on the modified compression field theory. The program was developed at the University of Toronto by Evan Bentz in a project supervised by Professor Michael P. Collins.
Response-2000 is able to calculate the strength of traditional beams and columns as well as or better than existing methods and, more importantly, is able to make predictions of shear strengths for sections that cannot easily be modeled today such as circular columns and tapered web beams.
I emailed Professor Bentz and he mentioned that over 33,600 engineers and students in 153 countries have downloaded this software! Wow, I am sure out of the loop but I guess I am now 33,601!
Professor Bentz is working on a new version, available later this year, called Response-2010. The new version includes the flexibility to use any stress-strain curve you want, allows for an XML input file and should be easier to use. Did I mention it was FREE? Professor Bentz was also kind enough to send me a few screenshots.
Professor Bentz explains,
The first shows the new main screen with a sample member in it. The second shows how the new M-N interaction diagrams have all the points kept in them and thus we can examine them all and thus be fairly sure if we’re doing things correctly or not. The last shows a new mode whereby we can look at a particular depth and see how the shear is carried at that depth. This isn’t well shown as a still image as it’s much more instructive to move the cross section up or down or to change the loads and watch the Mohr’s circles change.
So check out Response-2000.