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基于预应力筋与结构相互作用机理,推导了预应力内荷载表达式,证明直接内载法计算预应力内荷载的真确性。依据直接内载法和等效荷载法的详细对比,分析了它们之间的差异性和一致性,并说明了直接内载法能够准真确计算预应力内荷载。它是对目前普遍使用的等效荷载法的修正和补充。为了研究直接内载法和等效荷载法的异同,设计了两根两跨预应力连续试验梁。通过试验和数值分析,对比研究了预应力筋与结构耦合相互作用,有效地验证了本文理论的研究结果。
Based on the interaction mechanism between prestressing tendons and structure, the expression of internal prestressing force is deduced. It is proved that the direct internal loading method can calculate the true load of prestressing force. According to the detailed comparison of direct internal loading method and equivalent loading method, the difference and consistency between them are analyzed, and the direct internal loading method can accurately calculate the internal stress in prestressing. It is a modification and addition to the commonly used equivalent load method. In order to study the similarities and differences between the direct internal loading method and the equivalent loading method, two two-span prestressed continuous test beams were designed. Through the experimental and numerical analysis, the coupling interaction between prestressing tendons and structures is comparatively studied, which effectively validates the research results of this paper.