西安建筑科技大学学报(自然科学版)

首次将预应力槽型板应用于人防结构中,为研究装配式预应力槽型板结构体系在设计人防荷载作用下的抗爆性能,对缩尺比为1:3的槽型板进行了模拟核爆试验,分析大跨预应力槽型板结构在人防爆炸荷载作用下的动力性能、变形性能.再对有限元模型在4级爆炸等级作用下进行模拟分析,并与试验结果对比.研究结果表明:在核5级人防荷载作用下试验构件完好,仅在构件底部受拉区和端部剪切区出现少量裂缝; 在核4级作用下,结构未发生脆性断裂,说明合理设计的装配式预应力混凝土槽型板可以用于4级的人防工程; 也证明了装配式预应力混凝土槽型板具有良好的位移延性,不会发生脆性破坏,可用于抗爆结构; 通过模拟分析,验证有限元模拟的真实性以及分析结果的可靠性.

In this paper, prestressed channel slab is applied to civil defense structure for the first time In order to study the blast resisting performance of prefabricated prestressed groove slab structure system under the load of civil defense, this paper carried out the nuclear explosion simulation experiment on channel slab with the scale ratio of 1:3, and analyzed the dynamic performance and deformation performance of the large-span prestressed groove slab structure under the action of the load of civil defense. Then the finite element model was simulated and analyzed under the action of grade 4 explosion and compared with the test results. The results show that the test components are intact under the action of nuclear grade 5 civil defense load, and only a few cracks appear in the tensile zone at the bottom of the components and the shear zone at the end. Under the action of nuclear level 4, there is no brittle fracture of the structure, which indicates that the prestressed concrete groove plate with reasonable design can be used in civil defense engineering of grade 4. It is also proved that the prestressed concrete groove slab has good displacement ductility and does not have brittle failure. Through simulation analysis, the authenticity of finite element simulation and the reliability of analysis results are verified.

引言
1 试验概况
2 试验结果
3 有限元分析
4 结论

图1 预应力槽型板结构图(单位:mm)<br/>Fig.1 Prestressed channel slab structure(Unit:mm)

图1 预应力槽型板结构图(单位:mm)
Fig.1 Prestressed channel slab structure(Unit:mm)

表1 试验所用混凝土材料强度<br/>Tab.1 Compressive strength of concrete MPa

表1 试验所用混凝土材料强度
Tab.1 Compressive strength of concrete MPa

表2 试验所用钢筋材料强度<br/>Tab.2 Yield strength and ultimate strength of steel

表2 试验所用钢筋材料强度
Tab.2 Yield strength and ultimate strength of steel

表3 动载试验平面装药计算结果<br/>Tab.3 Gunpowder calculation under dynamic load

表3 动载试验平面装药计算结果
Tab.3 Gunpowder calculation under dynamic load

图2 预应力槽型板结构及平面装药加载装置图(单位:mm)<br/>Fig.2 Prestressed grooved plate structure and gunpowde device(Unit:mm)

图2 预应力槽型板结构及平面装药加载装置图(单位:mm)
Fig.2 Prestressed grooved plate structure and gunpowde device(Unit:mm)

图3 现场布置
Fig.3 Site layout

表4 炮次统计表
Tab.4 The explosion number

表5 第4炮的主要参数试验结果一览表<br/>Tab.5 The major parameter for the fourth charge

表5 第4炮的主要参数试验结果一览表
Tab.5 The major parameter for the fourth charge

图4 爆腔空气冲击波超压波形<br/>Fig.4 Air wave pressure in the blasting cavity

图4 爆腔空气冲击波超压波形
Fig.4 Air wave pressure in the blasting cavity

图5 跨中结构压力<br/>Fig.5 Mid-span structural pressure

图5 跨中结构压力
Fig.5 Mid-span structural pressure

图6 跨中应变<br/>Fig.6 Mid-span structural strain

图6 跨中应变
Fig.6 Mid-span structural strain

图7 跨中东侧位移<br/>Fig.7 Displacement in east midspan

图7 跨中东侧位移
Fig.7 Displacement in east midspan

表6 挠度统计表
Tab.6 Deflection

表7 槽型板上表面结构峰值压力统计表/MPa<br/>Tab.7 Peak structural pressure on channel plates /MPa

表7 槽型板上表面结构峰值压力统计表/MPa
Tab.7 Peak structural pressure on channel plates /MPa

图8 挠度与空压<br/>Fig.8 Deflection and air pressure

图8 挠度与空压
Fig.8 Deflection and air pressure

图9 跨中峰值压力与空压<br/>Fig.9 Midspan peak pressure and air pressure

图9 跨中峰值压力与空压
Fig.9 Midspan peak pressure and air pressure

图10 支座压力与空压<br/>Fig.10 Bearing pressure and air pressure

图10 支座压力与空压
Fig.10 Bearing pressure and air pressure

图11 1/4分点结构压力与空压<br/>Fig.11 1/4 of the plate peak pressure and air pressure

图11 1/4分点结构压力与空压
Fig.11 1/4 of the plate peak pressure and air pressure

表8 混凝土应变统计表<br/>Tab.8 Peak structural pressure on channel plates

表8 混凝土应变统计表
Tab.8 Peak structural pressure on channel plates

图12 峰值混凝土应变与空压关系曲线<br/>Fig.12 Peak concrete strain and air pressure

图12 峰值混凝土应变与空压关系曲线
Fig.12 Peak concrete strain and air pressure

表9 正压作用时间统计表<br/>Tab.9 Time of positive pressure

表9 正压作用时间统计表
Tab.9 Time of positive pressure

图13 试验数据与有限元模拟对比<br/>Fig.13 Displacement in test and ABAQUS

图13 试验数据与有限元模拟对比
Fig.13 Displacement in test and ABAQUS

图14 Mises应力分布云图<br/>Fig.14 Mises stress pattern

图14 Mises应力分布云图
Fig.14 Mises stress pattern

图15 混凝土损伤云图<br/>Fig.15 Concrete damage pattern

图15 混凝土损伤云图
Fig.15 Concrete damage pattern

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备注

引言

1 试验概况

2 试验结果

3 有限元分析

4 结论

期刊信息