桥墩复合材料柔性防撞护舷试验

doi:10.13229/j.cnki.jdxbgxb.20211227

Abstract

Abstract:

Aiming at the problem that the existing protective structure can not achieve multi-objective ship-type flexible protection，a flexible fender which can protect small and medium-sized ships is proposed.The fender can be used with the existing protective structure.To determine the optimal form，the quasi-static compression tests of three different flexible fenders are carried out.And the protective performance of the optimal structural fender is analyzed through full scale impact test and numerical simulation.The results indicate that the failure modes of different specimens are similar under compression test.The outer plate shear failure， matrix cracking and fiber fracture occurred in all specimens.At the end of compression， the springback rate of each specimen was as high as 85%.Specimen 3 with energy dissipation core material is the optimal structure.For the drop weight impact test， the reduction rate of impact force reaches 97%.Fender deformation recovers completely after impact， and fender dissipates energy in the form of elastic energy dissipation.Under barge impact， the fender absorbs 63% of the collision energy and greatly reduces ship damage.In this condition， the fender mainly absorbs the collision energy with the collapse of the energy dissipating core material.

Key words: engineering of communications and transportation system, composite materials, flexible fender, compression test, impact test, numerical simulation

CLC Number:

U417.1

Zhi ZHENG,Pei YUAN,Xuan-hui JIN,Si-si WEI,Bo GENG. Experimental on composite flexible anti⁃collision fender of bridge pier[J].Journal of Jilin University(Engineering and Technology Edition), 2023, 53(9): 2581-2590.

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参数	数值
密度ρ_CSC/（kg·m^-3）	2500
剪切模量G/10¹⁰ Pa	1.166
体积模量K/10¹⁰ Pa	1.277
三轴压缩面常数α/10⁷ Pa	1.471
三轴压缩面线性参数θ	0.3016
三轴压缩面非线性常数λ/10⁷ Pa	1.051
三轴压缩面指数β/10^-8 Pa^-1	1.929
硬化系数N_H	1
硬化率C_H	0
扭转面常数α₁	0.7473
扭转面线性参数θ₁/10^-9 Pa^-1	1.108
扭转面非线性参数λ₁	0.17
扭转面指数β₁/10^-8 Pa^-1	6.896
三轴延伸面常数α₂	0.66
单轴压应力速率效应参数η_0c/10^-4	1.022
单轴拉应力速率效应参数η_0t/10^-5	6.32
最大压应力OVERC/10⁷ Pa	2.211
三轴延伸面线性参数θ₂/10^-9 Pa^-1	1.336
三轴延伸面非线性参数λ₂	0.16
三轴延伸面指数β₂/10^-8 Pa^-1	6.896
帽盖面长宽比R	5
帽盖初始位置X_D/10⁷ Pa	9.129
最大塑性体积压实率W	0.05
线性参数D₁/10^-10 Pa^-1	2.5
二次形参数D₂/10^-10 Pa^-2	3.492
韧性形状软化参数B	300
单轴拉伸断裂能GFT（Pa·m）	7213
纯剪应力下的断裂能GFS（Pa·m）	72.13
剪-压过渡参数PWRC	5
剪-拉过渡参数PWRT	1
压缩软化参数PMOD	3.5
单轴压应力的速率效应功率N_C /10^-4	1.022
单轴拉应力的速率效应功率N_t	0.48
最大拉应力OVERT/10⁷ Pa	2.211

参数	数值
密度ρ_F/（kg·m^-3）	1800
a方向弹性模量E_a/GPa	20
b方向弹性模量E_b/GPa	20
ab方向剪切模量G_ab/GPa	4.32
bc方向剪切模量G_bc/GPa	4.32
ca方向剪切模量G_ca/GPa	4.32
a方向拉伸强度X_t	460
b方向拉伸强度Y_t/MPa	460
a方向压缩强度X_c/MPa	130
b方向压缩强度Y_c/MPa	130
剪切强度S_c/MPa	70
泊松比μ	0.07

Experimental on composite flexible anti⁃collision fender of bridge pier

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