Horizontal Flexural Tests On Bed Joint Reinforced Duplex Cavity Walls (dcw)


Given the form and technical nature of masonry walls in Spain, it is necessary to find ways of solving the ever more  common symptoms that are found in cavity wall type construction.  The Department of Architectural Technology and Construction (DCTA) at Madrid Polytechnic (UPM) began tests in 1996 to establish the horizontal flexural strength of masonry walls.  The tests were carried out on different specimens (walls 3 m long x 1 m or 1.20 m high).  The test findings evaluate the more relevant aspects of using horizontal bed joint reinforcement in clay cavity walls.  It  was found that the extensometric gauges used did not show uniform behaviour in all the tests, due to problems with adherence to the reinforcement.  The cavity walls showed acceptable strength behaviour.  In all cases, cracking values were higher than that established in the NBE-AE-88 Code for wind resistance and dynamic pressure.  Buckling of the reinforcement at the wall support was found in one case.  In terms of the strut-and-tie calculation method established in the new Spanish EHE code, the similarity of reinforced masonry with reinforced concrete, while not being  immediately apparent, may be considered to be possible.  16 refs.

Primary author(s): Adell J M, Gonzalez Bravo C, Laheras-Merino F

                            Madrid,Polytechnic University

Source: 12th IB2MaC. Twelfth Int.Brick/Block Masonry Conf. Proc.

            Madrid,25-28 June 2000,p.73-84

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