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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

40卷

期数:

2023年01期

页码:

65-74

栏目:

建筑结构

出版日期:

2023-01-10

文章信息/Info

Title:

Experimental study and theoretical calculation on flexural performance of UHPC-T beams

文章编号:

1673-2049(2023)01-0065-10

作者:

朱 琦,叶力豪,蔡 玮,谢 文

(宁波大学 土木工程与地理环境学院,浙江 宁波 315211)

Author(s):

ZHU Qi, YE Lihao, CAI Wei, XIE Wen

(School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, Zhejiang, China)

关键词:

UHPC-T梁;  抗弯性能;  开裂弯矩;  极限弯矩;  后张预应力

Keywords:

UHPC-T beam;  flexural performance;  cracking moment;  ultimate bending moment;  post-tensioned prestress

分类号:

TU375.1

DOI:

10.19815/j.jace.2021.08086

文献标志码:

A

摘要:

为研究配筋率和预应力对超高性能混凝土T梁(UHPC-T梁)抗弯性能的影响,设计并制作了4根UHPC-T梁与1根普通混凝土T梁,采用三等分点抗弯试验研究了T梁加载破坏的全过程特征,并采用理论公式计算了T梁的开裂弯矩和极限弯矩等关键性能参数。结果表明:配筋率对UHPC-T梁开裂荷载的影响不大; 相同配筋率下,预应力UHPC-T梁的极限承载力约为UHPC-T梁的1.4倍,UHPC-T梁的极限承载力约为普通混凝土T梁的2倍,表明预应力和UHPC均可明显提升T梁的极限承载能力; 与普通混凝土T梁相比,UHPC-T梁裂缝细而密,加载初期最大裂缝宽度发展较慢,裂缝宽度及其数量明显减少; 与UHPC-T梁相比,预应力UHPC-T梁能有效抑制裂缝的生成与发展,表明预应力和UHPC能改善T梁的抗裂性能; 各试验梁跨中正截面混凝土应变与荷载基本呈正比例关系,表明平截面假定同样适用于预应力UHPC-T梁与UHPC-T梁; T梁的理论开裂弯矩和极限弯矩均与相应的试验结果吻合较好,且两者之间的相对误差小于20%,满足工程设计要求。

Abstract:

In order to study the influence of reinforcement ratio and prestress on the flexural performance of ultra-high performance concrete T-beam(UHPC-T beam), four UHPC-T beams and one ordinary concrete T-beam were designed and manufactured. The whole process characteristics of T-beam loading failure were studied by three-point bending test, and the key performance parameters such as cracking moment and ultimate bending moment of T-beam were calculated by theoretical formula. The results show that the reinforcement ratio has little effect on the cracking load of UHPC-T beam. Under the same reinforcement ratio, the ultimate bearing capacity of prestressed UHPC-T beam is about 1.4 times that of UHPC-T beam, and the ultimate bearing capacity of UHPC-T beam is about 2 times that of ordinary concrete T beam, indicating that both prestress and UHPC can significantly improve the ultimate bearing capacity of T beam. Compared with the ordinary concrete T beam, the cracks of UHPC-T beam are fine and dense, the maximum crack width develops slowly at the initial stage of loading, and the crack width and its number are significantly reduced. Compared with UHPC-T beam, prestressed UHPC-T beam can effectively inhibit the generation and development of cracks, indicating that prestress and UHPC can improve the crack resistance of T beam. The strain of normal section concrete in the mid-span of each test beam is basically proportional to the load, indicating that the plane section assumption is also applicable to prestressed UHPC-T beams and UHPC-T beams. The theoretical cracking moment and ultimate bending moment of T beam are in good agreement with the corresponding test results, and the relative error between them is less than 20%, which meets the engineering design requirements.

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备注/Memo

备注/Memo:

收稿日期:2021-08-21
基金项目:国家自然科学基金项目(52278189); 宁波市自然科学基金项目(202003N4138)
作者简介:朱 琦(1994-),男,工学硕士研究生,E-mail:1451317027@qq.com。
通信作者:谢 文(1981-),男,工学博士,副教授,E-mail:xiewen@nbu.edu.cn。

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更新日期/Last Update: 2023-01-01