Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effect of Concrete Masonry Unit Web Thickness on the Compressive Strength of Concentrically and Eccentrically Loaded Hollow Masonry Prisms
ASTM C90 and CSA A165 are the governing standards prescribing allowable concrete masonry unit (CMU) geometry in the United States and Canada, respectively. Since 2011, ASTM C90 has allowed a decreased web thickness of 19 mm regardless of CMU size. Conversely, CSA A165 has maintained historically used minimum web thicknesses that increase with CMU size starting at 26 mm for 100 mm nominal sized CMUs. Thinner webs reduce CMU weight and so result in reduced cost and potential for workplace injury along with improved energy efficiency. No experimental work was identified examining the contribution of CMU webs to the compressive strength of masonry. It was hypothesized that a reduction in web thickness could lead to a decrease in masonry strength since hollow masonry prisms tend to fail due to tensile splitting through the webs of the CMUs. An experimental program was therefore conducted to examine the influence of varying CMU web thickness on the compressive strength of prisms under eccentric and concentric loading. CMUs with web thicknesses meeting the minimum requirements of ASTM C90 and CSA A165 were used to construct five-course tall masonry prisms. Additional parameters investigated included CMU size, nominal CMU strength, and knock-out units. Thirty-two series with six replicates in each for a total of 192 five-course tall prisms were tested: 120 were subject to axial concentric loading, and 72 were subject to eccentric loading. Preliminary results show that differences in the development of the strain gradient are not significant for prisms built using 200 mm CMUs and subject to eccentric loading, but that statistically significant differences in the resulting masonry assemblage strength exist when subject to concentric loading.
Effect of Concrete Masonry Unit Web Thickness on the Compressive Strength of Concentrically and Eccentrically Loaded Hollow Masonry Prisms
ASTM C90 and CSA A165 are the governing standards prescribing allowable concrete masonry unit (CMU) geometry in the United States and Canada, respectively. Since 2011, ASTM C90 has allowed a decreased web thickness of 19 mm regardless of CMU size. Conversely, CSA A165 has maintained historically used minimum web thicknesses that increase with CMU size starting at 26 mm for 100 mm nominal sized CMUs. Thinner webs reduce CMU weight and so result in reduced cost and potential for workplace injury along with improved energy efficiency. No experimental work was identified examining the contribution of CMU webs to the compressive strength of masonry. It was hypothesized that a reduction in web thickness could lead to a decrease in masonry strength since hollow masonry prisms tend to fail due to tensile splitting through the webs of the CMUs. An experimental program was therefore conducted to examine the influence of varying CMU web thickness on the compressive strength of prisms under eccentric and concentric loading. CMUs with web thicknesses meeting the minimum requirements of ASTM C90 and CSA A165 were used to construct five-course tall masonry prisms. Additional parameters investigated included CMU size, nominal CMU strength, and knock-out units. Thirty-two series with six replicates in each for a total of 192 five-course tall prisms were tested: 120 were subject to axial concentric loading, and 72 were subject to eccentric loading. Preliminary results show that differences in the development of the strain gradient are not significant for prisms built using 200 mm CMUs and subject to eccentric loading, but that statistically significant differences in the resulting masonry assemblage strength exist when subject to concentric loading.
Effect of Concrete Masonry Unit Web Thickness on the Compressive Strength of Concentrically and Eccentrically Loaded Hollow Masonry Prisms
Lecture Notes in Civil Engineering
Gupta, Rishi (Herausgeber:in) / Sun, Min (Herausgeber:in) / Brzev, Svetlana (Herausgeber:in) / Alam, M. Shahria (Herausgeber:in) / Ng, Kelvin Tsun Wai (Herausgeber:in) / Li, Jianbing (Herausgeber:in) / El Damatty, Ashraf (Herausgeber:in) / Lim, Clark (Herausgeber:in) / Savkina, Olga V. (Autor:in) / Feldman, Lisa R. (Autor:in)
Canadian Society of Civil Engineering Annual Conference ; 2022 ; Whistler, BC, BC, Canada
Proceedings of the Canadian Society of Civil Engineering Annual Conference 2022 ; Kapitel: 2 ; 13-30
13.01.2024
18 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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