不同预拉力和冲击能量下BFRP筋的横向抗冲击性能

朱德举; 李振坤; 郭帅成; 李晟; 易勇

doi:10.13801/j.cnki.fhclxb.20210324.001

不同预拉力和冲击能量下BFRP筋的横向抗冲击性能

doi: 10.13801/j.cnki.fhclxb.20210324.001

湖南大学　土木工程学院　绿色先进土木工程材料及应用技术湖南省重点实验室，长沙 410082

基金项目: 国家自然科学基金(U1806225；51778220)；国家重点研发计划项目(2017YFC0703006)；湖湘高层次人才聚集工程-创新人才(2018RS3057)；湖南省高新技术产业科技创新引领计划项目(2020GK2079)

详细信息

通讯作者:
朱德举，博士，教授，博士生导师，研究方向为生物材料多尺度力学行为及仿生、高性能纤维/织物增强水泥基和树脂基复合材料、防弹高性能纤维布的力学特性和有限元分析、冲击和高应变率试验技术　E-mail：dzhu@hnu.edu.cn

中图分类号: TB332
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出版历程
- 收稿日期: 2021-01-28
- 修回日期: 2021-02-24
- 录用日期: 2021-03-15
- 网络出版日期: 2021-03-25
- 刊出日期: 2022-01-15

Lateral impact resistance of BFRP tendon under different pretensions and impact energies

Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, China

摘要

摘要: 为研究玄武岩纤维增强树脂基复合材料(Basalt fiber reinforced polymer，BFRP)筋的低速冲击性能，通过落锤冲击试验测试了不同预拉力比值(2%、10%、20%和30%)和不同能量(12.76~31.90 J)作用下BFRP筋的低速冲击响应，同时测试了未完全断裂试件的残余拉伸承载力。结果表明：BFRP筋的损伤破坏模式包括冲击面树脂破碎、部分纤维断裂和BFRP筋完全断裂。在冲击能量为19.14 J，预拉力从2%增大到10%和20%时，BFRP筋的破坏模式从冲击面树脂破碎转变为部分纤维断裂。施加预拉力提高了BFRP筋断裂时的耗能，但对峰值荷载影响较小。BFRP筋未完全断裂时，试件的残余变形、耗能和冲击时间与预拉力呈负相关；当BFRP筋完全断裂时，冲击后试样的残余变形随预拉力的增大而减小，耗能和冲击时间先增大后减小。BFRP筋的残余拉伸承载力随冲击能量的增大而减小。研究发现BFRP筋的残余拉伸承载力和试件耗能/总冲击能量(耗能比)都能较好地评估BFRP筋的损伤程度。本研究成果可以为预应力BFRP筋抗冲击设计提供重要参考。
- BFRP筋 /
- 低速冲击 /
- 破坏模式 /
- 耗能比 /
- 冲击损伤
Abstract: In order to study the low-velocity impact performance of basalt fiber reinforced polymer (BFRP) tendon, the drop-weight impact test of the BFRP tendon was conducted to examine the low-velocity impact response under different pretension ratios (2%, 10%, 20%, and 30%) and impact energies (12.76 -31.90 J). Meanwhile, the residual tensile loading capacity of the incompletely broken specimens was further measured. Experimental results indicate that the failure modes of BFRP tendon include resin failure on the impact side, partial fracture of the fiber and complete fracture of the BFRP tendon. Under 19.14 J impact energy, the failure mode of the BFRP tendon changes from resin failure on the impact side to partial fracture of the fiber when the pretension ratio is increased from 2% to 10% and 20%. Meanwhile, the applied pre-tension enhances energy consumption, but the influence on the peak force is minimal. When the BFRP tendon is not completely broken, the residual deformation, energy consumption and the impact contact time of the specimen are negatively related to the pretension ratio. When the BFRP tendon is completely broken, the residual deformation of BFRP tendon decreases with the pretension ratio while the energy consumption and impact time first increases and then decreases with the pretension ratio. And the residual tensile loading capacity of the BFRP tendon decreases with the increase of impact energy. The impact damage level of BFRP tendon can be appropriately assessed with both the residual tensile loading capacity and the ratio between energy consumption and total impact energy (energy absorption ratio) of the specimen. The results of this study can provide important reference for the impact resistance design of the pre-tensioned BFRP tendon.
- BFRP tendon /
- low-velocity impact /
- failure modes /
- energy absorption ratio /
- impact damage

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图 1 BFRP冲击试件

Figure 1. Impact specimen of BFRP

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图 2 低速冲击测试用冲击锤头及BFRP筋安装支座

Figure 2. Impactor and BFRP tendon mounting support for low-velocity impact test

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图 3 不同冲击能量和预拉力下BFRP筋的冲击力-变形曲线

Figure 3. Impact force-deformation curves of BFRP tendon under different impact energies and pretension ratios

P2, P10, P20, P30—Pretension ratios of 2%, 10%, 20% and 30%, respectively

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图 4 不同冲击能量下2%预拉力的BFRP筋的冲击破坏形态

Figure 4. Damage modes of BFRP tendon under 2% pretension ratio and different impact energies

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图 5 不同冲击能量和预拉力下BFRP筋的冲击力和能量-时程曲线

Figure 5. Impact force and energy-time history curves of BFRP tendon under different impact energies and pretension ratios

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图 6 预拉力对BFRP筋峰值荷载${F_{{\rm{max}}}}$及残余变形$D$的影响

Figure 6. Effect of pretension ratio on peak force ${F_{{\rm{max}}}}$ and residual deformation $D$ of BFRP tendon

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图 7 冲击能量对BFRP筋峰值荷载增长系数${I_{\rm{f}}}$及承载力残余系数${R_{\rm{f}}}$的影响

Figure 7. Effect of impact energy on peak force increase factor ${I_{\rm{f}}}$ and factor of residual bearing capacity ${R_{\rm{f}}}$ of BFRP tendon

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表 1 玄武岩纤维增强树脂基复合材料(BFRP)筋的力学性能^[25]

Table 1. Mechanical properties of basalt fiber reinforced polymer (BFRP) tendon^[25]

Type	Tensile strength/MPa	Load bearing capacity/kN	Elastic modulus/GPa	Ultimate strain/%	Shear strength/MPa
BFRP	1113.40	17.64	50.81	2.23	169.10

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表 2 不同预拉力和冲击能量下BFRP试件耗能

Table 2. Energy consumption of BFRP specimens under different impact energies and pretension ratios

$\lambda $/%	${E_0}$/J	${E_{{\rm{tot}}}}$/J	${E_{{\rm{ab}}}}$/J	${E_{{\rm{ab}}}}/{E_{{\rm{tot}}}}$
2	12.76	13.32(0.79)	6.96(0.60)	0.52(0.01)
	19.14	20.15(0.12)	15.91(1.26)	0.79(0.06)
	25.52	26.94(0.20)	25.75(0.43)	0.96(0.01)
	31.90	34.33(0.15)	30.96(2.24)	0.90(0.06)
10	12.76	13.97(0.08)	6.66(0.14)	0.48(0.01)
	19.14	20.69(0.11)	10.76(0.41)	0.52(0.02)
	25.52	27.40(0.18)	22.31(1.67)	0.81(0.06)
	31.90	34.06(0.16)	31.18(1.66)	0.92(0.05)
20	12.76	13.79(0.01)	6.06(0.25)	0.44(0.02)
	19.14	20.49(0.04)	10.67(1.78)	0.52(0.09)
	25.52	27.29(0.19)	23.94(2.54)	0.88(0.09)
	31.90	34.07(0.29)	33.72(1.77)	0.99(0.05)
30	12.76	13.88(0.63)	5.83(0.29)	0.42(0.00)
	19.14	20.50(0.10)	13.90(2.17)	0.68(0.11)
	25.52	27.21(0.23)	24.28(2.31)	0.89(0.08)
	31.90	33.98(0.09)	32.70(1.80)	0.96(0.05)
Notes: $\lambda $—Ratio of the initial pretension to the load bearing capacity of the BFRP tendon; ${E_{\rm{0}}}$, ${E_{{\rm{tot}}}}$, ${E_{{\rm{ab}}}}$ and ${E_{{\rm{ab}}}}/{E_{{\rm{tot}}}}$—Initial impact energy, total impact energy, absorbed energy and energy absorption ratio of BFRP tendon, respectively; Values in the parentheses—Standard deviations.

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表 3 不同冲击能量及预拉力下BFRP的抗冲击性能

Table 3. Impact performance of BFRP under different impact energies and pretension ratios

$\lambda $/%	${E_0}$/J	${F_{\max }}$/kN	${I_{\rm{f}}}$	$D$/mm	${t_{\rm{d}}}$/ms	${T_{\rm{r}}}$/kN	${R_{\rm{f}}}$
2	12.76	3.27(0.12)	1.00	3.73(0.25)	21.01(0.92)	9.68(0.69)	0.55
	19.14	3.99(0.15)	1.22	6.04(0.72)	25.11 (0.35)	3.25(0.09)	0.18
	25.52	4.57(0.25)	1.40	9.94(0.23)	34.53 (2.17)	0.35(0.05)	0.02
	31.90	4.59(0.12)	1.40	18.94(1.18)	11.72 (0.40)	0(0)	0
10	12.76	3.15(0.08)	1.00	3.00(1.55)	22.37 (0.59)	9.99(0.62)	0.57
	19.14	4.12(0.05)	1.31	3.14(0.21)	21.21(0.53)	6.35(0.75)	0.36
	25.52	4.50(0.2)	1.43	6.20(1.25)	26.05 (0.65)	3.20(0.45)	0.18
	31.90	4.63(0.42)	1.47	16.87(1.28)	12.75 (2.37)	0(0)	0
20	12.76	3.17(0.04)	1.00	1.41(0.02)	21.06 (0.30)	10.14(0.50)	0.57
	19.14	4.12(0.08)	1.30	1.80(0.60)	20.71 (0.57)	6.33(0.78)	0.36
	25.52	4.28(0.14)	1.35	5.72(0.92)	27.82 (2.49)	2.62(0.83)	0.15
	31.90	4.68(0.26)	1.48	16.97(2.24)	13.69 (2.26)	0(0)	0
30	12.76	3.16(0.09)	1.00	1.74(0.40)	19.90 (0.24)	10.81(0.47)	0.61
	19.14	4.10(0.02)	1.30	2.59(0.56)	21.38 (1.47)	5.60(0.42)	0.32
	25.52	4.21(0.37)	1.33	4.96(0.34)	24.10 (4.79)	0.65(0.27)	0.04
	31.90	4.51(0.16)	1.43	16.27(0.70)	11.95 (0.73)	0(0)	0
Note: ${F_{\max }}$, ${I_{\rm{f}}}$, $D$, ${t_{\rm{d}}}$, ${T_{\rm{r}}}$ and ${R_{\rm{f}}}$—Peak force, peak force increase factor, residual deformation, impact time, residual load bearing capacity and factor of residual bearing capacity of BFRP tendon, respectively.

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