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锈蚀PC构件剩余预加力计算方法*
张旭辉,王磊,张建仁
摘 要
(长沙理工大学桥梁工程安全控制省部共建教育部重点实验室, 长沙 410004)

[摘要]预应力筋锈蚀后截面积减小,导致预加力损失。预压状态下的混凝土必然会发生弹性膨胀,其膨胀又受到预应力筋的约束,从而引起预应力筋和混凝土弹性变形的改变。考虑锈蚀过程中预应力筋截面积的减小,以及预应力筋和混凝土弹性变形的改变,对锈蚀预加力损失进行了计算。分析了预应力筋和混凝土弹性变形的改变对锈蚀预加力损失的影响,给出了剩余预加力的简化计算方法,并通过锈蚀PC构件抗弯试验对计算结果进行了验证。研究表明:预应力筋和混凝土弹性变形的改变对锈蚀预加力损失影响不大,采用预应力筋面积锈蚀率估算锈蚀预加力损失率的方法具有较高的精度。
[关键词]桥梁工程; PC构件; 剩余预加力; 截面积损失; 弹性变形; 计算方法
中图分类号:U441.4      文献标识码:A      文章编号:1002-848X(2015)15-0097-05

Calculating method of residual prestress force  for corroded PC members
Zhang Xuhui, Wang Lei, Zhang Jianren
(Key Laboratory of Safety Control of Bridge Engineering, Ministry of Education and Hunan Province, Changsha University of Science and Technology, Changsha 410004, China)
 
Abstract:Corrosion of prestressing tendons reduces the cross-section area, which results in prestress force loss. Under the condition of pre-compression, elastic-expansion happens in concrete and the expansion is restrained by the prestressing tendon, which leads to the elastic deformation change of the prestressed tendons and concrete. The loss of the corroded prestress force was calculated considering the decrease of the cross-section area of prestressing tendons and the elastic deformation change of the prestressed tendons and concrete. The effect of the elastic deformation change of prestressing tendons and concrete on the corroded prestress force loss was analyzed. The simplified calculation method for the residual prestress force was provided and results were verified by bending test on corroded PC member. Research shows that the elastic deformation change of prestressing tendons and concrete has little effect on the corroded prestress force loss, and it has high accuracy to estimate the rate of corroded prestress force loss by using the area corroded rate of prestressing tendons.
Keywords:bridge engineering; PC member; residual prestress force; cross-section loss; elastic deformation; calculating method

*全国优秀博士论文作者专项基金(201247),湖南省研究生科研创新项目资助(CX2014A015),长沙理工大学桥梁工程安全控制省部共建教育部重点实验室开放基金资助项目(14KD10)。
 
通信作者:王磊,博士,教授,Email:leiwlei@hotmail.com。
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