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

Abstract

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

CLC Number:

TU375.2

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

Bending behaviors of two-way slab of UHPC with steel fiber and micro-nonmetallic fiber

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