Analysis on Dynamic Response of Bridge Pier under Near-field Underwater Explosion Loading

doi:10.12382/bgxb.2023.0717

Abstract

Abstract:

The dynamic response and damage mechanism of piers under underwater explosion loading are analyzed to investigate the damage to a pier caused by underwater explosion by using the arbitrary Lagrangian-Euler method. The accuracy of the finite element model is verified through an underwater explosion test, and then a finite element model of a pier under underwater explosion loading is established. Taking the residual vertical bearing capacity of the pier as the performance index, the damage evaluation method of pier under explosion loading is put forward. The influences of explosive weight and initiation point on the damage degree of pier are discussed. The investigation results indicate that the damage to the pier caused by bubble pulsation generated by a near-field underwater explosion cannot be ignored. When the outer side of pier is detonated, the TNT weight is exponentially related to the residual bearing capacity of pier. When the weight of TNT is the same, the damage caused by the explosion inside the pier is the most serious.

Key words: underwater explosion, pier, bubble pulsation, safety factor

CLC Number:

TJ301

ZHOU Longyun, LI Xiaojun, YAN Qiushi. Analysis on Dynamic Response of Bridge Pier under Near-field Underwater Explosion Loading[J]. Acta Armamentarii, 2023, 44(S1): 90-98.

Figures/Tables 18

Fig.1 Underwater explosion test

Table 1 Test conditions

序号	W/kg	R/m	H/m	Z/(m·kg^-1/3)
1	0.4	1	1	1.36
2	0.8	1	1	1.08

Fig.2 Finite element model

Table 2 Concrete material parameters

参数	数值	参数	数值	参数	数值
ρ₀/(kg·m^-3)	2300	A₂/Pa	3.958×10¹⁰	Q₀	0.6805
N	3.0	B₁	1.22	β_t	0.036

Table 3 Steel material parameters

参数	数值	参数	数值
密度/(kg·m^-3)	7800	弹性模量/GPa	1.96
杨氏模量/GPa	196	硬化参数	40
泊松比	0.3	应变率参数	5
屈服应力/MPa	335

Fig.3 Numerical simulation and experimental comparison

Table 4 Comparison of explosion test and finite element results

TNT质量/ kg	参数	试验/ mm	数值模拟/ mm	误差/%
0.4	最大位移	41.81	41.18	1.51
	残余位移	13.56	12.63	6.86
0.8	最大位移	52.58	49.70	5.48
	残余位移	18.79	16.54	11.97

Fig.4 Finite element arrangement

Fig.5 Pier geometry (unit:mm)

Fig.6 Damage process of RC bridge pier

Fig.7 Pressure nephogram of RC pier

Fig.8 Strain nephogram of pier under underwater explosion loading

Fig.9 Damage process of RC bridge pier

Fig.10 Explosion equivalent-residual bearing capacity fitting curve

Fig.11 Residual bearing capacity and damage coefficient of piers with different initiation points

Fig.12 Schematic diagram of different detonation points

Fig.13 Residual bearing capacity and damage coefficient of piers with different initiation points

Fig.14 Pier damage at different initiation points of 200ms

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