| 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. |
| 关键词: 冻融 预应力混凝土 承载性能 理论计算 |
| DOI：10.3969/j.issn.1007 9629.2015.06.014 |
| 分类号: |
| 基金项目: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） |
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| Flexural Bearing Capacity of Prestressed Concrete after Freeze Thaw |
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CHEN Yueping1, HU Qiangsheng1, ZHANG Jianfei1, ZHANG Yiduo2
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1.Department of Construction Engineering, Anqing Vocational & Technical College, Anqing 246003, China;2.School of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212003, China
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| Abstract: |
| Experiments of five prestressed concrete beams after different times of freeze thaw were carried out to investigate the load bearing property of specimens. Based on the test data and previous work in concrete after freeze thaw, the formula of βn，α′n，ξb has been established after n times of freeze thaw. Comparing the values of theoretical calculation with experimental values, the conclusion that the calculation formula can reflect the general law of flexural bearing capacity of prestressed concrete beam normal section after freeze thaw effect has been verified. |
| Key words: freeze thaw prestressed concrete load bearing property theoretical calculation |
