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试验研究了5根预应力混凝土梁经历不同冻融循环次数后的承载性能,通过试验数据及借鉴前人关于冻融后混凝土应力、抗拉强度等力学性能变化的研究成果,参考GB 50010—2010《混凝土结构设计规范》,得出了经历n次冻融循环后预应力混凝土梁矩形应力图的受压区高度与中和轴高度的比值βn、预应力混凝土梁矩形应力图的应力值与混凝土轴心抗压强度设计值的比值α′n以及界限破坏时截面相对受压区高度ξb的计算公式,从而给出了冻融后预应力混凝土梁在使用阶段的正截面受弯承载力计算公式;将理论计算值、试验值进行比较后发现,上述计算公式能反映冻融作用后预应力混凝土梁在使用阶段的正截面受弯承载力的一般规律.
Experimental study of the five prestressed concrete beams subjected to different freeze-thaw cycles after the bearing capacity of the test data and learn from previous studies on the mechanical properties of concrete after freezing and thawing changes in tensile strength, the reference GB 50010-2010 The “Design Code for Concrete Structures” gives the ratio of the height of compression zone to the height of neutral shaft after the freezing-thawing cycle of n-times of prestressed concrete beams, and the stress value of the rectangular stress diagram of prestressed concrete beams is equal to that of concrete Axial compressive strength of the design value of the ratio α’n and the boundary of the section when the relative compression zone height ξb formula, which gives the freeze-thaw pre-stressed concrete beams in the use phase of the section of the flexural capacity of the formula The theoretical calculation and experimental results are compared. It is found that the above formula can reflect the general law of flexural bearing capacity of normal section of prestressed concrete beam during its use.