冻融后预应力混凝土正截面受弯承载力研究

发布时间：2018-07-09 16:54

本文选题：冻融 + 预应力混凝土　；参考：《建筑材料学报》2015年06期

【摘要】：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.
[Abstract]:The load-bearing performance of five prestressed concrete beams after different freeze-thaw cycles was studied. Through the test data and the previous research results on the mechanical properties of concrete after freezing and thawing, such as stress, tensile strength, etc. Referring to GB 50010-2010, the ratio of the height of the compression zone to the height of the middle axis of the rectangular stress diagram of the prestressed concrete beam after n freeze-thaw cycles is obtained, and the response of the rectangular stress diagram of the prestressed concrete beam to the height of the neutral axis is obtained. The ratio of the force value to the design value of the axial compressive strength of concrete and the calculation formula of the height of the section relative to the compression zone when the limit is destroyed, The formula of flexural bearing capacity of normal section of prestressed concrete beam after freeze-thawing is given, and the theoretical calculation value and test value are compared. The above formulas can reflect the general law of flexural bearing capacity of normal section of prestressed concrete beam after freeze-thaw action.
【作者单位】：安庆职业技术学院建筑工程系;江苏科技大学土木工程与建筑学院;
【基金】：建筑技术实训基地项目(中央财政支持)(34113042613) 安徽省级示范实验实训中心项目(20101474)
【分类号】：TU528.01

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