Experimental Analysis of Bending Stiffness Characteristics of Grouted Double Mortise-Tenon Joint for Prefabricated Metro Station Structure

Table 1

Test cases and layout.

Cases	Axial load: 0 kN, 500 kN, 1000 kN, and 1250 kN	Without auxiliary pretightening device
		With auxiliary pretightening device
Test content		The amount of opening and compression of the joint (so as to obtain the joint rotation angle); the whole process record of crack development details of the joint
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