Abstract
The size of concrete specimen is the main reason affecting the shear fracture toughness, so this research carried out five groups of experiments including 40 symmetrically loading specimens with different lengths and heights. Through P-CTSD (loading and crack tip sliding displacement curve), P–ϵ (loading and strain curve) and P–t (loading and time curve), the effects of length and height of specimens on shear fracture toughness were studied. Stability of specimen is strengthened by increasing length and weakened by increasing height. Size effect on fracture toughness is weakened by increasing of length and strengthened by the increasing of height. Fracture toughness will increase with the increasing of length and decrease with the increasing of height.
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