[1]罗许国,王义翔,汪建群.无粘结预应力活性粉末混凝土梁疲劳全过程应力计算方法研究[J].西安建筑科技大学学报(自然科学版),2019,51(01):39-45.[doi:10.15986/j.1006-7930.2019.01.007]
　LUO XuguoWANG YixiangWANG Jianqun.Study on the method for stress calculation of fatigue process of unbonded prestressed reactive powder concrete beams method study[J].J. Xi’an Univ. of Arch. & Tech.(Natural Science Edition),2019,51(01):39-45.[doi:10.15986/j.1006-7930.2019.01.007]
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无粘结预应力活性粉末混凝土梁疲劳全过程应力计算方法研究()
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西安建筑科技大学学报（自然科学版）[ISSN:1006-7930/CN:61-1295/TU]

卷:
51
期数:
2019年01期
页码:
39-45
栏目:
出版日期:
2019-02-28

文章信息/Info

Title:
Study on the method for stress calculation of fatigue process of unbonded prestressed reactive powder concrete beams method study
文章编号:
1006-7930(2019)01-0039-07
作者:
罗许国; 王义翔; 汪建群
(湖南科技大学 土木工程学院,湖南 湘潭 411201)
Author(s):
LUO XuguoWANG YixiangWANG Jianqun
(Hunan University of science and Technology, Xiangtan 411201, China)
关键词:
无粘结预应力活性粉末混凝土梁; 疲劳试验; 疲劳残余应变; 疲劳变形模量; 疲劳全过程
Keywords:
unbonded prestressed active powder concrete beam;  fatigue test;  fatigue residual strain;  fatigue deformation modulus;  fatigue whole process
分类号:
TU37
DOI:
10.15986/j.1006-7930.2019.01.007
文献标志码:
A
摘要:
通过对无粘结预应力活性粉末混凝土梁进行等幅疲劳试验研究，得到了RPC应变﹑受拉钢筋应变和无粘结筋应力增量随疲劳循环次数变化的变化值.结合试验结果，提出了适用于活性粉末混凝土的疲劳残余应变演化方程及疲劳变形模量退化方程.基于损伤变量的定义形式及应变等效原理，推导了钢筋弹性模量退化模型及剩余疲劳强度模型；受拉钢筋及无粘结筋弹性模量退化模型及剩余疲劳强度模型的不同通过两者的S-N曲线和屈服强度的不同来体现.基于上述模型采用分段线性原理来代替疲劳非线性过程，并利用材料弹性模量的退化来反应材料的疲劳损伤，提出了无粘结预应力RPC梁疲劳全过程正截面疲劳应力计算方法.将计算结果与试验值进行对比，两者吻合较好具有一定精度
Abstract:
Through equal-amplitude fatigue test of unbonded prestressed reactive powder concrete beams, the variation of RPC strain, tensile strain of steel bars and stress increment of unbonded tendons with the number of fatigue cycles were obtained. Based on the experimental results, the fatigue residual strain evolution equation and the fatigue deformation modulus degradation model of the active powder concrete are proposed. Based on the definition of damage variable and strain equivalent principle, the elastic modulus degradation model and residual fatigue strength model of steel bar are derived. The elastic modulus degradation model of residual steel and unbonded tendon and the residual fatigue strength model proved to be different. The difference between the S-N curve and the yield strength is reflected. Based on the above model, the piecewise linear principle is used to replace the fatigue nonlinear process, and the degradation of the material elastic modulus is used to reflect the fatigue damage of the material. The fatigue stress calculation method of the whole section of the unbonded prestressed RPC beam is proposed. Results are compared with the experimental values, and the two coincide with a certain accuracy.

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相似文献/References:

[1]罗许国,刘岱鑫.钢筋活性粉末混凝土梁的疲劳性能试验研究[J].西安建筑科技大学学报(自然科学版),2016,48(04):484.[doi:10.15986/j.1006-7930.2016.08. 004]
　LUO Xuguo,LIU Daixin.Research on the fatigue performance of reinforced reactive powered concrete beam [J].J. Xi’an Univ. of Arch. & Tech.(Natural Science Edition),2016,48(01):484.[doi:10.15986/j.1006-7930.2016.08. 004]

备注/Memo

备注/Memo:
收稿日期:2017-11-24
修改稿日期:2019-01-15
基金项目:湖南省教育厅项目(14A048)资助,国家自然科学基金项目(51408218)
第一作者：罗许国(1969－)，男，硕士生导师，主要从事桥梁结构高性能材料长期受力性能研究．E-mail: 1069859269@qq.com
通信作者：王义翔(1993－)，男，硕士生，主要从事桥梁疲劳性能研究．E-mail: 296029629@qq.com
更新日期/Last Update: 2019-03-05