Bhargav Raval The 76-story benchmark building problem is well-known in structural engineering and is frequently used as a benchmark to measure the effectiveness of various structural analysis and design methodologies. The topic was initially presented in the Journal of Structural Engineering in 2002 in the publication "Progressive Collapse Analysis of Building Structures: A New Test Problem for Third Generation Analysis Methods" by J. D. Netherton and D. L. McLean.

The MATLAB code for the 76-story benchmark building challenge, as you noted, is not included in the SSTL 2002 publication. The authors of the research did not disclose the code and instead utilized a commercial software tool to accomplish the structural analysis and design. As a result, the MATLAB code for the 76-story benchmark building challenge is not available in the SSTL 2002 publication.

Since the publication of the SSTL 2002 study, the problem parameters for the 76-story benchmark building issue may have been modified, or new benchmark building problems may have been established. I would suggest contacting professional groups such as the American Society of Civil Engineers (ASCE) or the International Association for Bridge and Structural Engineering (IABSE) for updates on the 76-story benchmark building challenge or new benchmark building problems. Furthermore, looking for new works in the field of structural engineering and analysis may give more up-to-date benchmark construction challenges and parameters.

I hope you find this information useful, and I wish you the best.