高温下混杂纤维自密实混凝土管片试验研究及数值分析

雒斌; 王欢; 白连伟; 任兆卿; 王姗姗

doi:10.3724/j.gyjzG23071115

高温下混杂纤维自密实混凝土管片试验研究及数值分析

doi: 10.3724/j.gyjzG23071115

1. 中交第三公路工程部有限公司, 江苏徐州 221008;
2. 中国矿业大学深地工程智能建造与健康运维全国重点实验室, 江苏徐州 221008

详细信息

作者简介:
雒斌,主要从事混凝土结构及构件抗火性能研究。

通讯作者:
王姗姗,硕士,主要从事结构抗火研究,wangss_0725@163.com。

计量
- 文章访问数: 39
- HTML全文浏览量: 6
- PDF下载量: 0
- 被引次数: 0
出版历程
- 收稿日期: 2023-07-11
- 网络出版日期: 2024-06-22

Experimental Study and Numerical Analysis of Hybrid Fiber Reinforced Self-Compacting Concrete Segments at High Temperatures

1. China Communications Third Highway Engineering Co., Ltd., Xuzhou 221008, China;
2. State Key Laboratory of Intelligent Construction and Health Operation & Maintenance of Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221008, China

摘要

摘要: 为研究预加荷载对混杂纤维自密实混凝土管片高温力学性能的影响,对5块缩尺管片进行高温试验,获得管片炉温、混凝土温度、变形和破坏模式等发展规律。此外,基于ABAQUS软件,建立升降温混杂纤维混凝土各阶段本构关系计算子程序,重点分析了显(隐)式瞬态热应变和预加荷载等对试件位移和等效塑性拉应变的影响规律。结果表明:随着预加荷载增加,管片侧面裂缝数量变多且长度变小,外弧面裂缝数量变少,内弧面裂缝分布更均匀;纤维的掺入有助于降低裂缝平均间距以及管片拱脚处混凝土高温损伤。瞬态热应变对降温阶段管片等效塑性拉应变分布有重要影响,采用显式瞬态热应变时,管片等效塑性拉应变分布与试验裂缝区域较为一致。
- 管片 /
- 混杂纤维 /
- 高温试验 /
- 预加荷载 /
- 瞬态热应变
Abstract: To study the preloading on the mechanical properties of hybrid fiber self-compacting concrete segments at high-temperatures, high-temperature tests were conducted on five segments to obtain the segment furnace temperature, concrete temperature, deformation, and failure mode. A calculation subroutine was developed based on ABAQUS software to establish a temperature field and mechanical analysis model for hybrid reinforced fiber self-compacting concrete segments. The appropriate constitutive relations during the different stages were selected, and the influence of explict or implicit transient thermal strain and preload on segment displacement and equivalent plastic tensile strain was analyzed. The results showed that as the preload increased, the number of cracks on the side of the segment increased and the length became smaller, the number of cracks on the outer arc surface decreased, the distribution of cracks on the inner arc surface became more uniform, and the addition of fibers was helpful to reduce the average crack spacing and the high temperature damage of concrete at the arch foot of segment. The transient thermal strain had an important influence on the equivalent plastic tensile strain distribution of the segment during the cooling stage. When the explicit transient thermal strain was used, the equivalent plastic tensile strain distribution of the segment was more consistent with the test crack area.
- tunnel segments /
- hybrid fibers /
- high temperature test /
- preloading /
- transient thermal strain

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