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1试验过程钢筋混凝土造合梁试验共进行了4根大尺寸钢筋混凝土选合梁的二次受力加载破坏试验。4根梁的代号分别取为DH－I、DH－2、DH－3和DH－4梁。梁长为L，宽为B，高为H，见表1。梁底部混凝土保护层厚30MM。受拉钢筋一排，共9根。其中5根直径为19MM，无弯起；2根直径为20MM，
1 Test Procedures Reinforced concrete composite beams were tested for a total of four large-size reinforced concrete composite beams subjected to secondary loading failure. The four beams were coded as DH-I, DH-2, DH-3, and DH-4 beams. The beam length is L, width is B, and height is H. See Table 1. The thickness of the concrete protection layer at the bottom of the beam is 30mm. Pulled by a bar, a total of nine. Five of them have a diameter of 19MM and no bending; two of them have a diameter of 20MM.