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本文通过试验,用精度较高的量测方法验证了文中提出的二阶段受力预应力混凝土迭合构件正截面受力性能电算模拟方法的合理性及准确性。在此基础上,对这类构件受力性能研究中尚未得到澄清的核心问题——二阶段受力特征系数的实质及其变化规律进行了论证,判明已有文献中存在的若干概念性错误。同时,还利用电算模拟方法验证了预应力混凝土迭合构件第二阶段截面开裂后钢筋应力的两种近似计算方法的适用性。
In this paper, the accuracy and accuracy of the method for calculating the mechanical properties of the two-stage stressed prestressed concrete laminated members using the high precision measurement method are verified by experiments. On this basis, the core issues that have not been clarified in the study of the mechanical behavior of this type of component, the essence of the two-stage force characteristic coefficient and its changing rules, are demonstrated, and a number of conceptual errors in the existing literature are identified. At the same time, the applicability of two approximate calculation methods for steel stress after section cracking of the prestressed concrete laminated structure was verified by computer simulation.