中空スラブのせん断性状に関する研究 (その 1) : せん断応力集中についての考察

抄録

In this report stress concentration around holes of void-slab under shear is analytically examined by means of bipolar coordinates. Under the assumption that the void-slab section is substituted by a semi-infinite plate containing a circular hole, calculated vabues of stress concentration factors κ=τ/τ_<mean>, i.e. the ratios of the maximum stress at the edge of the hole and the mean stress at the minimum cross section through the center of the hole, vary from 2 to 1 with the void ratios λ=φ/D, i.e. the ratios of the hole diameter to the slab depth. From these calculations it is known that in the case of usual void-slab sections (λ=0.6〜0.7), stress concentration factors are not so large (κ=1.08〜1.21). It is also confirmed that these results agree well with some experimental values by the measurement of surface strains of the mortar-made specimens and the photoelastic method.