Numerical Simulation and Experimental Study on Damage Effect of Prestressed T-shaped Beam under Blast Load

doi:10.12382/bgxb.2024.0961

Abstract

Abstract:

The damage effect of prestressed T-shaped beam under blast load is studied.A 1:3 complex steel-concrete structure finite element model of prestressed T-shaped beam is established by using nonlinear finite element software.The mesh size matching and coordination between reinforced beam elements and solid concrete elements are designed,along with the coupling among the prestressed steel strand,beam rib reinforcement,edge plate reinforcement and cross-beam reinforcement.Then cooling prestressed contraction method are used to flexibly control the accurate loading of value transfer between prestressed and T-shaped beam elements.The finite element simulation results are compered with the experimental results.The comparison result indicates that the numericial simulation and experimental damage situations are basically consistent,and at the same position,the relative error between the simulated value of shock wave overpressure and the test value is less than 20%,which verifies the effectiveness of the numerical simulation model.It can provide the simulation methods and data support for the vulnerability analysis and explosion resistance design of subsequent steel-concrete frame structures.

Key words: blast load, prestressed T-shaped beam, cooling prestressed contraction method, numerical simulation

ZHANG Jiansheng, JING Jianbin, SUN Hao, WANG Xiquan, LI Bo. Numerical Simulation and Experimental Study on Damage Effect of Prestressed T-shaped Beam under Blast Load[J]. Acta Armamentarii, 2024, 45(S2): 193-198.

Figures/Tables 10

Fig.1 Prestressed T-shaped beam full model size

Fig.2 Prestressed reinforcement layout

Fig.3 Measurement point layout of bridge

Fig.4 Prestressed T-shaped beam finite element model

Fig.5 Prestressed steel bars finite element model

Table 1 Material parameters of steel bars

ρ₀/ (kg·m^-3)	E/GPa	v	σ₀/MPa	E_p/GPa	β
7800	206	0.3	235	1	1

Fig.6 Stress cloud map of surrounding concrete under the action of prestressed steel bars

Fig.7 Damage simulation results of prestressed T-shaped beam

Fig.8 Comparision between the measured and simulated results of shock wave overpressure

Table 2 Comparison between overpressure test and simulated results

爆心距/m	仿真数/MPa	实测数/MPa	相对误差/%
1	9.24	9.455	2.74
2	6.17	7.688	18.02
3	3.29	2.822	7.23
4	1.93	1.217	2.77

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