2Grimm C T. Strength and related properties of brick masonry [ J]. Journal of Structural Division, 1975,101 (1) :217 -232.
3Brameshuber I W, Beer I, Schmidt U. German investi- gations on shape factors for masonry units and high precision elements [ J ]. Masonry International Journal of the British Masonry Society,2007,20(2) :61 -68.