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研究施工期钢筋混凝土受弯构件的受力特征并建立承载力计算模型,为分析施工期钢筋混凝土结构的承载性能提供可靠的理论依据,对钢筋混凝土结构施工期的安全性分析与控制以及钢筋混凝土结构全寿命分析具有重要的理论意义和实际价值。选取14,180 d两个混凝土龄期,对4根钢筋混凝土梁进行承载力试验,观测试件的破坏形态及变形特点,对比两个龄期极限弯矩值的大小,分析跨中挠度、跨中混凝土应变分布、钢筋自由端滑移等变量随荷载的变化规律。通过对施工期钢筋混凝土受弯构件的数值模拟,分析施工期钢筋混凝土受弯构件主要的受力特征。运用极限平衡理论,建立施工期钢筋混凝土受弯构件正截面承载力的计算模型,分析施工期钢筋混凝土受弯构件承载力随龄期而变化的规律。
Study the mechanical characteristics of flexural members of reinforced concrete during construction and establish a calculation model of bearing capacity, provide a reliable theoretical basis for analyzing the bearing capacity of reinforced concrete structures during construction, analyze and control the safety of reinforced concrete structures during construction, Structural life-span analysis has important theoretical and practical value. The two concrete ages of 14,180 d were selected to test the bearing capacity of four reinforced concrete beams and observe the failure morphology and deformation characteristics of the specimens. Comparing the ultimate bending moment values of two age ages, Strain distribution, steel free-end slip and other variables with the load changes. Through the numerical simulation of flexural members of reinforced concrete during construction period, the main force characteristics of flexural members of reinforced concrete during construction period are analyzed. By using the theory of limit equilibrium, the calculation model of the normal section bearing capacity of flexural members of reinforced concrete during construction is established, and the law of bearing capacity of flexural members of reinforced concrete with varying age is analyzed.