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Compressive Stress-strain of Unreinforced Masonry Boundary Element Prisms

Title:

Compressive Stress-strain of Unreinforced Masonry Boundary Element Prisms

Mohamed, Mohamed Yosry Mohamed ORCID: https://orcid.org/0000-0002-5904-7052 (2018) Compressive Stress-strain of Unreinforced Masonry Boundary Element Prisms. Masters thesis, Concordia University.

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Abstract

Reinforced masonry shear walls (RMSW) with masonry boundary elements (BE) are rectangular walls having integrated masonry BEs at the wall extremities. These BEs can be constructed using half pilaster block (i.e. C-shaped blocks) or regular stretchers. The compressive stress-strain response of the masonry BEs prisms built using stack-bonded C-shaped blocks (C-MSBEP) vary from that of regular stretchers prisms due to the continuity of the grout core (i.e. absence of block’s webs) and the higher grout-to-shell area ratio. Understanding and enhancing the stress-strain response of the masonry BE is a key to enhance the overall response of the RMSW with BEs. One of the challenges limiting the use of RMSW in high-rise buildings is the low compressive strength of masonry compared to reinforced concrete. Many studies showed that for specific block strength increasing the grout strength will not result in a proportional increase in the masonry prism capacity. Although some factors that result in minimizing the grout contribution to the prism strength were previously investigated, a consensus on the main governing factors is yet to be established.
In this study, the compressive stress-strain relationships of half-scale fully-grouted C-MSBEP and its constituents (i.e. masonry shell and grout core) are studied. In total, eight fully-grouted masonry BE prisms, six un-grouted masonry BE shells, eighteen grout core prisms, nine running-bonded fully-grouted stretcher block prisms, and nine stack-bonded fully-grouted stretcher block prisms have been tested under concentric compression loading. Both the un-grouted masonry shells and the grout core prisms had the same height as the grouted C-MSBEPs. The test matrix is composed of two different prisms’ aspect ratios, namely two and five. The grouted stretcher block prisms were grouted using normal strength grout while the grouted C-MSBEPs were grouted using two grout strengths, normal and high strength.
The study covers the effect of prism construction techniques in Canadian and US standards on the stress-strain response of C-MSBEPs, comparing the stress-strain of C-MSBEPs to regular stretcher block prisms, and the effect of the interaction between the masonry shell and the grouted core on the masonry compressive strength. In addition, the effect of treatment, air and wet, on the stress-strain response was also examined on the grout core prisms. Moreover, the stress-strain relationship of the 200 mm x 100 mm grout cylinders is compared to that of the grout core prisms to study the shape and size effects. The results of the grouted C-MSBEPs were compared to four predictive equations from the literature and to the unit strength values provided by the Canadian and US standards to evaluate their ability to predict the peak strength of the grouted BEs.
The stress-strain response of C-MSBEPs was found to be different from that of regular stretcher block prisms and is affected differently by height-to-thickness ratio. Thus, two analytical models were proposed to predict the full stress-strain response of C-MSBEPs and stretcher block prisms. The shape and size effects on grout core prisms are evident especially for normal strength grout. The superposition of the load-displacement response of the grout core and the masonry shell was found to be not comparable to that of the grouted BE. The effect of treatment on the stress-strain relationship of the grout cores was found to be insignificant. The equations available in the literature that were used to predict the capacity of masonry prisms were found to misestimate the experimental results of the tested C-MSBEPs. The US Masonry Structures Joint Committee (MSJC 2013) design standard was found to introduce better estimation for C-MSBEP’s compressive strength compared to the Canadian Standard Association CSA S304 (2014) “Design of Masonry Structures”. Both the CSA A179 (2014) “Mortar and grout for unit masonry” grout cylinders and the ASTM C1019 (2014) “Standard Test Method for Sampling and Testing Grout” grout prisms were found not representing the actual grout stress-strain response within the C-MSBEP, mainly because they do not simulate the effect of grout shrinkage in actual masonry prisms. Therefore, an equation was proposed that considers the different factors affecting the contribution of the grout core to the strength of C-MSBEPs.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Building, Civil and Environmental Engineering
Item Type:Thesis (Masters)
Authors:Mohamed, Mohamed Yosry Mohamed
Institution:Concordia University
Degree Name:M.A. Sc.
Program:Civil Engineering
Date:December 2018
Thesis Supervisor(s):Galal, Khaled
ID Code:984870
Deposited By: Mohamed Mohamed
Deposited On:17 Jun 2019 19:21
Last Modified:17 Jun 2019 19:21

References:

Abo El Ezz, A., Seif Eldin, H. M., and Galal, K. (2015). “Influence of confinement reinforcement on the compression stress-strain of grouted reinforced concrete block masonry boundary elements.” Structures, Elsevier B.V., 2, 32–43.
Albutainy, M., Ashour, A., and Galal, K. (2017). “Effect of Boundary Elements Confinement Level on The Behaviour of Reinforced Masonry Structural Walls with Boundary Elements.” 13th Canadian Masonry Symposium, Halifax, Canada.
ASTM C1019. (2014). “Standard Test Method for Sampling and Testing Grout.” ASTM International, West Conshohocken, PA.
ASTM C109. (2013). “Standard Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or [50-mm] Cube Specimens).” ASTM International, West Conshohocken, PA.
ASTM C1314. (2014). “Standard Test Method for Compressive Strength of Masonry Prisms.” ASTM International, West Conshohocken, PA.
ASTM C140. (2015). “Standard Test Methods for Sampling and Testing Concrete Masonry Units and Related Units.” ASTM International, West Conshohocken, PA.
ASTM C469. (2014). “Standard Test Method for Static Modulus of Elasticity and Poisson’s Ratio of Concrete in Compression.” ASTM International, West Conshohocken, PA.
ASTM C617. (2014). “Standard Practice for Capping Cylindrical Concrete Specimens.” ASTM International, West Conshohocken, PA.
Banting, B. R., and El-Dakhakhni, W. W. (2012). “Force- and displacement-based seismic performance parameters for reinforced masonry structural walls with boundary elements.” Journal of Structural Engineering (United States), 138(12), 1477–1491.
Boult, B. F. (1979). “Concrete Masonry Prism Testing.” ACI Journal Proceedings, 76(24), 513–536.
Chahine, G. N., and Drysdale, R. G. (1989). “Influence of Test Conditions on the Compressive Strength and Behaviour of Faceshell Mortar Bedded Concrete Block Prisms.” 5th Canadian Masonry Symposium, University of British Columbia, Vancouver, B.C., Canada, 651–660.
CSA A165. (2014). “CSA Standards on concrete masonry units.” Canadian Standards Association, Mississauga, ON, Canada.
CSA A179. (2014). “Mortar and grout for unit masonry.” Canadian Standards Association, Toronto, ON, Canada.
CSA S304. (2014). “Design of masonry structures.” Canadian Standards Association, Mississauga, ON, Canada.
Drysdale, R. G., and Hamid, A. A. (1979). “Behavior of Concrete Block Masonry Under Axial Compression.” ACI Journal, 76(6), 707–721.
Drysdale, R. G., and Hamid, A. A. (1982). “Influence of the Characteristics of the Units on the Strength of Block Masonry.” Proceedings of the second North American Masonry Conference, University of Maryland, College Park, MD, USA.
Drysdale, R. G., and Hamid, A. A. (2005). Masonry Structures Behaviour and Design. Canada Masonry Design Centre, Mississauga, ON, Canada.
El-Dakhakhni, W., and Ashour, A. (2017). “Seismic Response of Reinforced-Concrete Masonry Shear-Wall Components and Systems: State of the Art.” Journal of Structural Engineering, 143(9), 03117001.
Ezzeldin, M., El-Dakhakhni, W., and Wiebe, L. (2017). “Experimental Assessment of the System-Level Seismic Performance of an Asymmetrical Reinforced Concrete Block–Wall Building with Boundary Elements.” Journal of Structural Engineering, 143(8), 04017063.
Fahmy, E. H., and Ghoneim, T. G. M. (1995). “Behaviour of Concrete Block Masonry Prisms under Axial Compression.” Canadian Journal of Civil Engineering, 22, 898–915.
Fortes, E. S., Parsekian, G. A., and Fonseca, F. S. (2014). “Relationship between the Compressive Strength of Concrete Masonry and the Compressive Strength of Concrete Masonry Units.” Journal of Materials in Civil Engineering, 27(9), 04014238.
Ganesan, T. P., and Ramamurthy, K. (1992). “Behavior of Concrete Hollow-Block Masonry Prisms under Axial Compression.” Journal of Structural Engineering, 118(7), 1751–1769.
Hamid, A. A., and Chukwunenye, A. (1986). “Compression Behavior of Concrete Masonry Prisms.” Journal of Structural Engineering, 112(3), 605–613.
Hamid, A. A., and Drysdale, R. G. (1979). “Suggested Failure Criteria for Grouted Concrete Masonry Under Axial Compression.” ACI Journal, 76(43), 1047–1061.
Hamid, A. A., Drysdale, R. G., and Heidebrecht, A. C. (1978). “Effect of Grouting on the Strength Characteristics of Concrete Block Masonry.” Proceedings of the North American Masonry Conference, Boulder, CO.
Hassanli, R., ElGawady, M. A., and Mills, J. E. (2015). “Effect of dimensions on the compressive strength of concrete masonry prisms.” Advances in Civil Engineering Materials, 4(1).
Hedstrom, E. G., and Hogan, M. B. (1990). “The Properties of Masonry Cgrout in Concrete Masonry.” Masonry: Components to Assemblages, ASTM STP 1063, ASTM International, 47–62.
Khalaf, F. M. (1996). “Factors Influencing Compressive Strength of Concrete Masonry Prisms.” Magazine of Concrete Research, 48(175), 95–101.
Khalaf, F. M., Hendry, A. W., and Fairbairn, D. R. (1994). “Study of the compressive strength of blockwork masonry.” ACI Structural Journal, 91(4), 367–375.
Klinger, T. S. C. and R. E. (1986). “Compressive Strength of Concrete Masonry Prisms.” ACI Journal Proceedings, 83(1), 88–97.
Korany, Y., and Glanville, J. (2005). “Comparing Masonry Compressive Strength in Various Codes.” Concrete International, 27(07), 35–40.
Malhotra, V. M. (1976). “Are 4 x 8 Inch Concrete Cylinders as Good as 6 x 12 Inch Cylinders for Quality Control of Concrete?” ACI Journal Proceedings, 73(1), 33–36.
Mander, J. B., Priestley, M. J. N., and Park, R. (1988a). “Theoretical Stress-Strain Model for Confined Concrete.” Journal of Structural Engineering, 114(8), 1804–1826.
Mander, J. B., Priestley, M. J. N., and Park, R. (1988b). “Observed Stress-Strain Behavior of Confined Concrete.” Journal of Structural Engineering, 114(8), 1827–1849.
Martins, R. O. G., Nalon, G. H., Alvarenga, R. de C. S. S. A., Pedroti, L. G., and Ribeiro, J. C. L. (2018). “Influence of blocks and grout on compressive strength and stiffness of concrete masonry prisms.” Construction and Building Materials, Elsevier Ltd, 182, 233–241.
Maurenbrecher, A. H. P. (1980a). “Effect of the test procedures on compressive strength of masonry prisms.” 2nd Canadian Masonry Symposium, Carleton University, Ottawa, ON , Canada, 119–132.
Maurenbrecher, A. H. P. (1980b). “Effect of the test procedures on compressive strength of masonry prisms.” 2nd Canadian Masonry Symposium, (922), 119–132.
MSJC. (2013). “Building Code Requirements for Masonry Structures.” TMS 602-13/ACI 530.1-13/ASCE 6-13, Masonry Society Joint Committee, Longmont, CO.
NCMA. (2014). “Evaluating The Compressive Strength of Concrete Masonry.” National Concrete Masonry Association, Herndon, Virginia.
Neville, A. M. (1956). “The influence of size of concrete test cubes on me all strength and standard deviation.” Magazine of Concrete Research, 8(23), 101–110.
NZS. (2004). “Design of Reinforced Concrete Masonry Structures.” 4230:2004, New Zealand Standards, Wellington, New Zealand.
Obaidat, A. T., Abo El Ezz, A., and Galal, K. (2017). “Compression behaviour of confined concrete masonry boundary elements.” Engineering Structures, Elsevier Ltd, 132, 562–575.
Obaidat, A. T., Ashour, A., and Galal, K. (2018). “Stress-strain behaviour of C-shaped confined concrete masonry boundary elements of reinforced masonry shear walls.” Journal of Structural Engineering, 144(8).
Priestley, M. J. N., and Chai Yuk Hon. (1984). “Prediction of Masonry Compression Strength Part:1.” New Zealand Concrete Construction, 28, 11–14.
Rizaee, S., Hagel, M. D., Kaheh, P., and Shrive, N. (2016). “Comparison of compressive strength of concrete block masonry prisms and solid concrete prisms.” 16th International Brick and Block Masonry Conference: IBMAC, London, UK, 1839–1846.
Romagna, R. H., and Roman, H. R. (2002). “Compressive Strength of Grouted and Un-grouted Concrete Block Masonry.” Proceedings of the British Masonry Society, 399–404.
Sarhat, S. R. (2016). “The Size Effect and Strain Effect in Reinforced Masonry.” Carleton University.
Sarhat, S. R., and Sherwood, E. G. (2014). “The prediction of compressive strength of ungrouted hollow concrete block masonry.” Construction and Building Materials, Elsevier Ltd, 58, 111–121.
Scrivener, J. C., and Baker, L. R. (1988). “Factors Influencing Grouted Masonry Prism Compressive Strength.” Proceedings of 8th International Brick/Block Masonry Conference, Ireland, 874–883.
Shedid, M. T., El-Dakhakhni, W. W., and Drysdale, R. G. (2010). “Alternative Strategies to Enhance the Seismic Performance of Reinforced Concrete-Block Shear Wall Systems.” Journal of Structural Engineering, 136(6), 676–689.
Sturgeon, G. R., Longworth, J., and Warwaruk, J. (1980). An Investigation of Reinforced Concrete Block Masonry Columns. University of Alberta Structural Engineering Report No. 91, Edmonton, AB, Canada.
Voon, K. C., and Ingham, J. M. (2006). “Experimental in-plane shear strength investigation of reinforced concrete masonry walls.” Journal of Structural Engineering, 132(3), 400–408.
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