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Use of EC6-like equations to estimate the compressive strength of masonry made of solid clay bricks and lime mortar
Published in Claudio Modena, F. da Porto, M.R. Valluzzi, Brick and Block Masonry, 2016
D. Ferretti, E. Coïsson, D. Ugolotti, E. Lenticchia
ABSTRACT: The present research is focused on the assessment of the compressive strength of historical masonries made of solid clay bricks and lime mortar, in order to reduce the need of destructive tests on existing buildings. Thus, a data-set of 52 specimen from 15 different references is collected and their different features (joint thickness, brick size and type, specimen shape and slenderness, end restraints) are taken into consideration, in order to limit, whenever possible, their effects on the scattering of the results. These homogenized data are then used to check the reliability of the most frequently adopted power equations; these power equations are used to compute the masonry compressive strength as a function of brick and mortar strengths. Results show that for these types of masonries the equations behave worse than the mean value of the experimental strengths. Thus, a proposal is made for a possible new calibration of the parameters with a robust fitting function, which allows to improve the values of R2 and to place the prediction on the safe side.
Latest Oligocene sea urchin fragments (Cidaroida, Echinodermata) from Hokianga, Northland, New Zealand
Published in New Zealand Journal of Geology and Geophysics, 2022
Seabourne Rust, Jack Grant-Mackie
Species-level identification of Stereocidaris spines (Figure 6) is hindered by the fact no radioles have been found articulated or directly associated with the type specimen tests (Fell 1954). The spines assigned to Stereocidaris are identified here largely on the basis of having external longitudinal flutings; sometimes rows of delicate thorns, but no outgrowths, and a well-developed cortex (see Fell 1954).