爆炸荷载下预应力T型梁毁伤效应数值仿真分析

doi:10.12382/bgxb.2024.0961

摘要/Abstract

摘要：

针对爆炸荷载下预应力T型梁结构毁伤效应问题,采用非线性有限元软件建立了1:3复杂预应力T型梁钢混结构有限元模型,设计了钢筋梁单元与实体混凝土单元之间的网格尺寸匹配与协调性,预应力钢绞线、梁肋钢筋、翼缘板钢筋、横隔梁钢筋之间的耦合性,并采用降温预应力筋收缩法,灵活控制了预应力与T梁单元之间量值传递的准确加载,并对有限元仿真结果与试验结果进行比较,结果表明:数值仿真与试验毁伤情况基本吻合;相同位置处冲击波超压仿真值与试验测试值相对误差不超过20%,验证了数值仿真模型的有效性。可为后续钢混框架结构易损性分析和抗爆性能设计提供仿真方法和数据支撑。

关键词: 爆炸荷载, 预应力T型梁, 降温预应力筋收缩法, 数值仿真

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

张见升, 景建斌, 孙浩, 王西泉, 李波. 爆炸荷载下预应力T型梁毁伤效应数值仿真分析[J]. 兵工学报, 2024, 45(S2): 193-198.

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.

图/表 10

图1 预应力T梁全桥模型尺寸

Fig.1 Prestressed T-shaped beam full model size

图2 预应力筋布置图

Fig.2 Prestressed reinforcement layout

图3 桥梁测点布置情况

Fig.3 Measurement point layout of bridge

图4 预应力T型梁有限元模型

Fig.4 Prestressed T-shaped beam finite element model

图5 预应力钢束有限元模型

Fig.5 Prestressed steel bars finite element model

表1 钢筋材料参数

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

图6 预应力筋作用下周围混凝土应力云图

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

图7 预应力T型梁毁伤仿真结果

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

图8 冲击波压力实测与仿真结果对比

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

表2 超压测试结果与仿真结果对比

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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