[1]于晓光,穆卓辉,邢国华.体内无粘结预应力混凝土梁受弯承载力计算模型研究[J].西安建筑科技大学学报(自然科学版),2021,53(01):40-46.[doi:10.15986/j.1006-7930.2021.01.006]
　YU Xiaoguang,MU Zhuohui,XING Guohua.Study on calculation model of bending bearing capacity of unbonded prestressed concrete beams[J].J. Xi’an Univ. of Arch. & Tech.(Natural Science Edition),2021,53(01):40-46.[doi:10.15986/j.1006-7930.2021.01.006]
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体内无粘结预应力混凝土梁受弯承载力计算模型研究()
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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:
53
期数:
2021年01期
页码:
40-46
栏目:
出版日期:
2021-02-28

文章信息/Info

Title:
Study on calculation model of bending bearing capacity of unbonded prestressed concrete beams
文章编号:
1006-7930(2021)01-0040-07
作者:
于晓光1; 2; 3; 穆卓辉3; 邢国华1
(1.长安大学 公路学院, 陕西 西安710064; 2.长安大学 旧桥检测与加固技术交通行业重点实验室, 陕西 西安710064; 3.内蒙古自治区交通建设工程质量监督局, 内蒙古 呼和浩特 010051)
Author(s):
YU Xiaoguang1; 2; 3;  MU Zhuohui3;  XING Guohua1
(1.School of Highway,Chang’an University, Xi’an 710064, China; 2.Key Laboratory of Bridge Detection & Reinforcement Technology of Ministry of Transport, Chang’an University, Xi’an 710064, China; 3.Inner Mongolia Communications Construction Engineering Quality Supervision Bureau, Hohhot 010051, China)
关键词:
无粘结预应力;  曲率分布;  塑性铰;  抗弯承载力
Keywords:
unbonded prestressing;  curvature distribution;  plastic hinge;  flexural bearing capacity
分类号:
TU375.1
DOI:
10.15986/j.1006-7930.2021.01.006
文献标志码:
A
摘要:
以两点对称荷载作用下无粘结预应力混凝土简支梁为研究对象,基于混凝土梁的整体变形及塑性铰分布特点,通过对梁实际曲率分布进行简化后计算得出预应力筋的应力增量,进一步提出了无粘结预应力混凝土简支梁受弯承载力的计算方法.通过77根无粘结预应力混凝土梁的试验数据对建议抗弯承载力计算模型进行验证,并将计算结果与美国ACI318规范的计算模型及其它模型的计算结果进行了对比.结果表明:无粘结预应力混凝土梁受弯承载力的试验值与理论预测值之比的平均值为1.047,标准差为0.077,变异系数为0.073,二者吻合较好; 与其他计算模型的计算结果相比,本文建议计算模型较真实地反映了预应力混凝土梁的曲率分布,可更准确的计算无粘结预应力混凝土梁的抗弯承载力.
Abstract:
By selecting the simply supported concrete beam prestressed with unbonded steel tendons under four-point loading as the research object, the stress increment of prestressed reinforcement was calculated by simplifying the actual curvature distribution. And a calculation model of flexural bearing capacity of the unbonded prestressed concrete beam was put forward based on the overall deformation and plastic hinge distribution characteristics of the concrete beam. The flexural bearing capacity calculation model was verified by 77 unbonded prestressed concrete beams, and was compared with ACI 318 code and other model. Good agreement between experimental results and predicted results was achieved with an average ratio of test values to predicted values being 1.046, the variance being 0.071, and the coefficient of variation being 0.256. Compared with the other models, the proposed model in this paper reasonably reflects the real curvature distribution of the prestressed concrete beams, and the flexural bearing capacity can be calculated more accurately.

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备注/Memo

备注/Memo:
收稿日期:2018-10-23 修改稿日期:2021-01-13
基金项目:陕西省青年科技新星基金资助项目(2017KJXX-37); 中央高校基本科研业务费(自然科学类)基金资助项目(300102218510); 内蒙古自治区交通运输厅建设科技资金资助项目(NJ-2015-30)
第一作者:于晓光(1978-),男,高级工程师,博士研究生,主要从事工程结构分析.E-mail:349425055@qq.com
通讯作者:邢国华(1983-),男,教授,博士生导师,主要从事混凝土结构抗震及耐久性研究.E-mail:ghxing@chd.edu.cn
更新日期/Last Update: 2021-02-28