Masonry Edge the Storypole Vol7 No1 : Page 21
For our example and given loadings, the results indicate partial reinforce -ment offers an econo mical alternative to 6t spacing for walls shorter than the listed heights in Table 3 . For mason contractors not in high seismic or high wind areas, Table 3 could be used as a point of discus sion with project engineers as to whether they considered partial reinforcement. For any project with its own specific loading conditions, a similar table can be developed. These are worth developing and examining to determine if the economy of the wall design can benefit from partial reinforcement. David T Biggs , PE, SE, DIST M ASCE, HTMS, is principal of Biggs Consulting Engineering in Troy, NY. He specializes in structural forensic engineering, masonry design and historic restoration. He lectures, is involved with research projects and provides consulting for the development of new masonry products. Biggs was a member of the Building Assessment Team that investigated the World Trade Center disaster for FEMA and the American Society of Civil Engineers. He is a Distinguished Member of ASCE, an Honorary Member of The Masonry Society and has been a visiting lecturer at the Czech Technical University in Prague and the University of Minho in Portugal for the European Course Advanced Masters in Structural Analysis of Monuments and Historic Constructions . He is a member of the Masonry Standards Joint Committee and a board member of both The Masonry Society and the Structural Engineering Institute of ASCE. Biggs is also a Great Mind of the Editorial Advisory Board of MasonryEdge/theStoryPole, a leading provider of masonry intelligence, and a partner of Constructive, LLC, prefabricated masonry wall system. biggsconsulting@att.net | 518.495.5739 Economy of Partial Reinforcement Design examples illustrate that under certain conditions (low seismicity and not in high wind areas), partially reinforced masonry walls provide greater economy compared to fully reinforced masonry because the partially reinforced system can: Dan Zechmeister , PE, AIA Detroit Honorary Affiliate member, executive director and structural services director of the Masonry Institute of Michigan, sets the pace infusing members with know ledge and confidence to collaborate with A/E/C in designing and constructing higher performance and more efficient masonry buildings using Masonry for All Its Worth. He has been actively involved on The Story Pole and MasonryEdge/ theStoryPole Editorial Advisory Boards since inception. He is an active member of ASTM, MSJC, the MIOSHA Masonry Wall Bracing Advisory Committee and board member of the AIA Build ing Enclosure Council of Greater Detroit. dan@mim-online.org 248.663.0415 • Decrease amount of grout required in a wall. • Reduce number of bars, lap splices and rebar positioners installed. • Reduce amount of mechanical consolidation and reconsolidation required. • Reduce number of cleanouts required for high-lift grouting. • Increase possible insulation so that overall R-value of the wall increases. • Increase mason’s productivity by installing fewer bars. • Decrease wall weight and footing sizes. # " ! -! These benefits can be compounded by effecting other aspects of the wall that affect economy: • Decrease amount of grout which can reduce thermal bridging. &*!) f; +(!''( #'' #(*(, -)!!, &($$#$!( -$#$&"'($%'#$#)&($#' -!'$#'(&)($#$#(' -) #', %%!($# -$!(&&(#'(!!&' -#&'&$)(*(, )!(, While there has been limited research on 6t, the available work indicates our standards are possibly overly conservative for certain conditions. Perhaps it’s time for the codes to re-evaluate the 6t criteria to larger values. Until then, engineers can effectively use the economy of partial reinforcement. Saving materials is the best thing we can do for improving the sustainability of our wall designs. III SE Michigan Outstate stonycreekservices.com Serving the Great Lakes states and beyond for over 30 years | Specialists in spray foam application Masonry Technology | Innovation Vol 7 No 1 MASONRY EDG E / thestorypole 21 masonryedge.com