（太原理工大学矿业工程学院， 太原 030024）

［摘要］钢纤维可取代钢筋用作混凝土管片的受力筋，但对于钢纤维混凝土管片的设计及承载力计算尚无统一定论。对钢纤维混凝土管片进行承载能力极限状态下应力-应变分析，提出了钢纤维混凝土管片承载能力极限状态承载力计算公式，通过对钢纤维混凝土进行抗压强度和残余弯曲强度测试，得出了不同纤维含量钢纤维混凝土应力-应变关系，按照本文所提出的公式，确定了管片所需钢纤维含量，制作了2块钢纤维混凝土管片，并进行抗弯试验。试验表明，钢纤维含量为40kg/m3的钢纤维混凝土管片极限承载力为247.5kN，验证了该含量下钢纤维混凝土管片可满足延性破坏要求，其安全分项系数高于1.1。此外，研究发现钢纤维混凝土管片破坏前并不能产生细而密集的裂缝，而是直接由1～2条宽大裂缝造成破坏，同时还发现钢纤维混凝土管片制作时需保证钢纤维分散的均匀性。

［关键词］钢纤维混凝土；管片；延性破坏；承载能力极限状态；应力应变分析

中图分类号：TU921文献标识码：A文章编号：1002-848X(2021)09-0063-07

Design and experimental study of steel fiber reinforced concrete segments

ZHANG Fan, LIAO Lin, ZHAO Jian, LIU Guanzhi, ZHANG Changsuo

（College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China）

Abstract:Steel fiber can be regarded as bearing bar and completely replace conventional rebar, but there is no unified conclusion on how to design steel fiber reinforced concrete segment (SFRCS) or compute its bearing capacity. The stress-strain analysis was conducted on SFRCS at ultimate limit state (ULS) of bearing capacity and bearing capacity calculation formula of SFRCS at ultimate limit state (ULS) of bearing capacity was put forward. The stress-strain relationship of steel fiber reinforced concrete of different fiber contents was obtained through compressive strength and residual bending strength tests, and the fiber content of SFRCS was decided through the proposed formula. Two pieces of SFRCSs were manufactured and bending tests were carried out. The test results show that the ultimate capacity of SFRCS with 40kg/m3 steel fiber content is 247.5kN, which verifies that the segments can meet the requirements of ductility failure, and its safety factor is higher than 1.1. In addition, the test also shows that SFRCS can’t produce fine and dense cracks before failure, rather than it is broken by 1～2 wide cracks. And the research discover that it is necessary to ensure the uniformity of steel fiber dispersion during the production of SFRCS.

Keywords:steel fiber reinforced concrete; segment; ductile failure; ultimate limit state of bearing capacity; stress-strain analysis

*国家自然科学基金项目（51604183），山西省自然科学基金（201601D202049）。

作者简介：张帆，硕士研究生，Email：zhangfan0567@link.tyut.edu.cn；通信作者：廖霖，博士，副教授，研究生导师，Email：tyut-ll@hotmail.com。