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本文通过系统试验,较全面地研究了钢筋混凝土迭合梁和预应力混凝土迭合梁板在二次受力下的正截面受力性能及迭合面的抗剪性能,证实迭合梁板在二次受力情况下,与相应整浇梁对比,受压区混凝土应变存在“迟后现象”;受拉钢筋应力存在“超前现象”。同时进一步分析研究了迭合梁在迭合前弯矩作用下所产生的“荷载预应力”和它的发生、发展过程与计算方法。在试验研究的基础上,提出了考虑上述特点的迭合梁板正截面强度、抗裂度、挠度及迭合面抗剪等的计算公式和有关构造措施。
In this paper, through systematic tests, the normal section mechanical behaviors of the reinforced concrete composite beams and prestressed concrete laminated beams under secondary loading and the shearing performance of the laminated surfaces are studied. It is proved that the laminated beams are Under the condition of secondary stress, compared with the corresponding cast-in-place beam, there is a “late phenomenon” in the concrete strain in the compression zone, and there is an “advance phenomenon” in the stress of the tensioned rebar. At the same time, the “load prestressing” and its occurrence, development process and calculation method of the laminated beam under the pre-stacking bending moment are further analyzed. Based on the experimental research, the calculation formulas and relevant structural measures for the normal section strength, crack resistance, deflection, and shear resistance of laminated slabs of laminated beams considering the above characteristics are proposed.