钢纤维与细非金属纤维混杂UHPC双向板弯曲特性

doi:10.13229/j.cnki.jdxbgxb.20230009

摘要/Abstract

摘要：

为研究混杂纤维对UHPC弯曲性能的影响，本文将钢纤维与3种新型非金属细纤维混杂，通过7组四边简支方板中心点加载试验，研究了各组试件的受力过程、破坏形态和荷载-挠度曲线，分析了混杂纤维UHPC板的初裂荷载、峰值荷载和弯曲韧性等。结果表明：混杂纤维提高了UHPC板的初裂荷载、峰值荷载、能量吸收值和变形性能；混杂纤维UHPC板的能量吸收值高于单掺1.3%钢纤维（SF）；混杂纤维UHPC板的峰后韧性指标T9（5.5）、T14（8）和T19（10.5）均高于单掺1.3%SF和1.8%SF试件，混杂纤维显著提高了残余承载力和变形能力；当SF分别与聚乙烯醇纤维（PVA）、玻璃纤维（GF）和玄武岩纤维（BF）混杂，SF/PVA、SF/BF的混杂增韧效应优于SF/GF。通过能量法、硬化指数和峰后韧性指标可以全面评价混杂纤维UHPC板在不同受力阶段的增强与增韧效应。

关键词: 结构工程, 超高性能混凝土, 混杂纤维, 弯曲韧性, 能量吸收, 韧性指标, 硬化指数, 双向板

Abstract:

To study the influence of hybrid fibers on the flexural properties of UHPC， steel fibers were mixed with three new types of micro-nonmetallic fiber. Through the center point loading test of seven groups of four-sided simply supported two-way slabs， the loading process， failure modes and load-deflection curves of each group were studied， and the initial crack load， peak load and bending toughness of hybrid fiber boards were analyzed. The results show that hybrid fibers can improve the initial crack load， peak load， energy absorption value and deformation performance of UHPC slabs. The energy absorption value of hybrid fiber board is higher than that of steel fiber （SF） doped 1.3%. The post-peak toughness indexes T9（5.5） and T14（8）， T19（10.5） of hybrid fiber UHPC slabs were higher than those of single-doped with 1.3%SF and 1.8%SF specimens， and hybrid fiber improved the residual bearing capacity and deformation capacity. When SF is mixed with polyvinyl alcohol fiber （PVA）， glass fiber （GF） and basalt fiber （BF）， the hybrid toughening effect of SF/PVA and SF/BF is better than SF/GF. Through energy absorption method， hardening index and post-peak toughness index， the strengthening and toughening effects of hybrid fiber UHPC slabs at different loading stages can be evaluated comprehensively.

Key words: structural engineering, ultra-high performance concrete, hybrid fiber, flexural toughness, energy absorption, toughness index, hardening index, two-way slab

中图分类号:

TU375.2

于跟社,邓宗才. 钢纤维与细非金属纤维混杂UHPC双向板弯曲特性[J]. 吉林大学学报(工学版), 2024, 54(11): 3265-3273.

Gen-she YU,Zong-cai DENG. Bending behaviors of two-way slab of UHPC with steel fiber and micro-nonmetallic fiber[J]. Journal of Jilin University(Engineering and Technology Edition), 2024, 54(11): 3265-3273.

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序号	试件编号	纤维类型及掺量
序号	试件编号	钢纤维/%	合成/无机非金属纤维
1	S-S1.3PVA0.5-12	1.3	0.5%（PVA-12-0.04）
2	S-S1.3G0.5-6	1.3	0.5%（GF-6-0.014）
3	S-S1.3G0.5-12	1.3	0.5%（GF-12-0.014）
4	S-S1.3G0.5-18	1.3	0.5%（GF-18-0.014）
5	S-S1.3B0.5-12	1.3	0.5%（BF-12-0.02）
6	S-S1.3	1.3	-
7	S-S1.8	1.8	-

项目	参数
型号	CW01-0.2/13
类别	镀铜、无端钩
长度/mm	13
直径/mm	0.2
长径比	65
抗拉强度/MPa	2 850

纤维种类	长度/mm	直径/mm	弹性模量/GPa	强度/MPa	密度/（kg·m^-3）	类别
PVA-12-0.04	12	0.040	40	>1 600	1 640	有机
GF-6-0.014	6	0.014	72	1 700	2 680	无机
GF-12-0.014	12	0.014	72	1 700	2 680	无机
GF-18-0.014	18	0.014	72	1 700	2 680	无机
BF-12-0.02	12	0.020	90	2 300	2 650	无机

序号	试件编号	抗压强度/MPa
1	S-S1.3PVA0.5-12	113.2
2	S-S1.3G0.5-6	127.7
3	S-S1.3G0.5-12	114.8
4	S-S1.3G0.5-18	110.0
5	S-S1.3B0.5-12	116.5
6	S-S1.3	118.3
7	S-S1.8	121.1

试件编号	初裂荷载P_cr/kN	峰值荷载P_u/kN	初裂挠度δ_cr/mm	峰值挠度δ_u/mm
S-S1.3PVA0.5-12	49.7	60.5	0.91	1.45
S-S1.3G0.5-6	44.3	49.5	0.99	2.72
S-S1.3G0.5-12	34.1	38.9	1.41	4.46
S-S1.3G0.5-18	42.8	47.2	1.16	2.27
S-S1.3B0.5-12	26.7	39.1	0.58	2.53
S-S1.3	25.6	31.8	1.21	5.61
S-S1.8	65.6	84.6	2.22	3.36