Transcription of NCMA TEK
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NCMA TEK
INTRODUCTION Engineered design of concrete masonry uses sectionSURSHUWLHV WR GHWHUPLQH VWUHQJWK VWLIIQHVV DQG GH HFWLRQ characteristics. These design philosophies are summa-rized inAllowable Stress Design of Concrete Masonry,Strength Design of Concrete Masonry andPost-Tensioned Concrete Masonry Wall Design(refs. 1, 2, 3).SECTION PROPERTIES Tables 1 through 13 summarize section propertiesof grouted and ungrouted 4-, 6-, 8-, 10-, 12-, 14- and16-in. (102-, 152-, 203-, 254-, 305-, 356- and 406-mm) wide concrete masonry walls, based on:x standard unit dimensions are based on the mini-mum face shell and web thickness requirements of6 WDQGDUG 6 SHFL FDWLRQ IRU /RDGEHDULQJ &RQFUHWH Masonry Units, ASTM C 90-06 (ref. 4) as shownin Figure 1, except as noted in Tables 8 through that prior to ASTM C 90-06, two minimumface shell thicknesses for units 10-in. (254-mm)DQG ZLGHU ZHUH VSHFL HG :LWK WKH LQWURGXFWLRQ of ASTM C 90-06, the two face shell thicknesseswere replaced with one minimum thickness require-ment (11/4 in.)
FOOTNOTES: A Net cross-sectional properties determined from a vertical plane that coincides with the face shells of the units. Net cross-sectional properties are to be used for determining stress and strain resulting from the application of load. B Average cross-sectional properties determined from two vertical planes calculated as the average of the net and solid proper-
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