1,721,069 research outputs found
Effect of Central Queensland sands on the shear capacity of concrete masonry containing damp proof course
No full textThe damp proof course (DPC) effectively breaks the bond between the masonry units and mortar Joints. The actual shear capacity that includes the shear bond strength and the frictional resistance is evaluated for hollow concrete block masonry joints containing DPC from seventy-two wallet tests. The effect of three mortar sands that are representative of the region of central Queensland is also investigated. It is shown that the type of sand in the mortar affects the shear capacity considerably. Other variables that affect the shear strength include the level of vertical stress and the inclusion ofDPC in mortar joint.constitutive relations for materials under complex 3D states of stress by judiciously designing an experimental setup involving complex shapes of structures with simple load application, which will significantly reduce the costs of generating complex 3D loading on simple shapes of specimens as traditionally followed. The material parameters obtained are more realistic as they account for the true status of the structures
Failure of the cores of partially reinforced masonry under lateral cyclic loading
No full textPartially reinforced masonry (PRM), consists of grout filled reinforced cores, bond and lintel beams, and unreinforced masonry panels. Even though the reinforced cores are designed to carry out-of-plane flexure caused by the horizontal loads, the behaviour of PRM to loading is neither well defined nor well understood, particularly the response of the lightly reinforced cores. Therefore the response of the reinforced cores of PRM to constant axial and cyclic lateral loading was studied. The mode of failure, the hysteretic moment-curvature curves and the bond characteristics of the reinforcing bars are presented in this paper
Effect of grout confinement on the compressive strength of masonry
No full textThe toe of shear walls and the walls under concentrated loading are normally subjected to high concentration of compressive stresses. Poor tensile strength and/or lack of sufficient compressive strength has the potential to cause localised bearing failure. Masonry has both limited compressive strength and very low tensile strength. A few techniques of improving the compressive strength of masonry (both clay and concrete) have been developed and presented in this paper. The techniques considered include the use of lateral reinforcement, fine wire mesh or welded wire mesh cages within the hollow cores of masonry prior to grouting and steel fibre reinforced grouting. The effect of the types of aggregates used in the grout was also examined
Characterisation and strategies for mitigation of the contact surface unevenness in dry-stack masonry
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Some inexpensive methods of confining grouted concrete masonry
No full textConcrete masonry walls are grouted either to increase their load bearing capacity at the support trusses or crossbeams or to allow the placement of reinforcing steel. Unfortunately, grouted masonry fails at stress levels lower than that of hollow masonry due to incompatible lateral deformation of the grout and the concrete masonry shell. Realising the importance of confining the grout to enhance the compressive strength of masonry, two inexpensive materials readily available in the market, namely fine wire mesh (FWM) and welded wire mesh (WWM) were used. Relative to the unconfined prisms, the FWM and WWM confined prisms exhibited 28% and 37% increase in the masonry compressive strength respectively
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