Numerical calculation of coupled damage effects on ship subjected to internal blast loading of warhead北大核心CSCD

［Objective］This paper studies the coupled damage effects of a ship's structure due to the internal blast loading of a warhead. ［Methods］Blast tests with cased charge data are conducted to verify the effectiveness of the coupled SPH-FEM approach, and numerical calculations are then performed on real ship compartment scale model tests to analyze the coupled fragmentation and shockwave damage effects of an explosion in a confined cabin.［Results］The results show that the fragments caused by the detonation of the warhead will first cause local damage to the cabin structure. The shockwave will exacerbate the local damage, and blasted openings will further increase the space for the propagation and diffusion of the shockwave inside the chamber, which will in turn cause damage to the adjacent structures. The simple equivalence of the warhead to a bare charge does not give a true picture of the effect of the warhead on the ship's structure, and fragmentation plays a significant role in the detonation of the warhead.［Conclusions］The results of this study show that employing the coupled SPH-FEM numerical method to calculate the coupling damage effects on a ship's structure can accurately reproduce the warhead damage pattern in tests, thereby providing support for the improved assessment of the damage of naval structures under warhead detonation. © 2022 Chinese Journal of Ship Research. All rights reserved.     

Vertical and horizontal bending moments on the hydroelastic response of a large-scale segmented model in a seaway

Wave-induced vertical bending moment (VBM) and horizontal bending moment (HBM) on a large-scale segmented model with a box-type backbone beam in short-crested irregular seas are systematically analyzed using sea trial measurement data. New insights into the relationship between nonlinear VBM and HBM of the ship sailing in short-crested sea waves are explored and presented. The results indicate that the HBM significantly contributes to the total sectional loads when the ship is sailing in a seaway and the HBM has a strong correlation with VBM in both magnitude and tendency. Therefore, design loads of HBM and the corresponding lateral structural strength issues should also be concerned in addition to VBM at the ship design phase.     

兰新铁路挡风墙的设计与施工

兰新铁路常年遭遇风害,列车被迫停运。根据风害提出解决列车倾覆和提速的工程措施,并阐述挡风墙的设计依据、稳定性检算、高度确定,以及三种结构类型挡风墙施工工艺、效果分析和改进措施。     

越海泥水盾构提前到达施工关键技术研究

由于竖井施工进度滞后,为解决盾构提前到达并保证顺利出洞这一技术难题,以台山核电站1#取水隧洞盾构提前到达施工为例,在理论研究的基础上,对盾构到达前的掘进控制措施进行分析,阐述了预留段隧洞爆破参数设计,并对提前到达的关键技术及控制要点进行总结。得出以下结论:1)盾构提前到达盾构井预留5 m的安全距离,并将刀盘后退掌子面0.7 m的方案是可行的,既能加快施工进度,又能有效地保护盾构设备;2)盾构到达预留段前采用"小推力、低转速"的掘进原则,预留5 m段采用"爆破开挖+锚喷支护+管片二次衬砌"相结合的施工方法,保证了盾构安全顺利出洞,有效地控制了管片上浮、错台和接缝处漏水等现象。     

水面舰艇舷侧防雷舱结构水下抗爆防护机理研究

在文献[1]朱锡等人关于水面舰艇舷侧防雷舱结构模型抗爆试验研究结果的基础上,分析了水面舰艇舷侧防雷舱各层防护结构在舷侧遭受水中兵器接触爆炸时的破坏模式,从能量的角度计算了各个防护层的吸能率.提出能量流的概念,揭示了水面舰艇舷侧防雷舱的防护机理,从而为防雷舱的防护设计提供了理论基础.     

江海通航顶推船铰接装置的波浪载荷模型试验研究

在不规则波中对某5000吨级的江海通航顶推船进行了两销式铰接装置的载荷模型试验.模型试验数据的无因次分析表明,在浪向角60°情况下铰接装置受力比其它浪向角时都要大,并且铰接装置受到的水平弯曲力比垂向弯曲力、轴向力大得多.推导了服从Weibull概率分布变量的短期概率极值预报公式.针对试验数据,进行了实船12小时短期概率极值预报,结果表明,在设计波高4.2m时,超越概率1%时的最大弯曲力相当于该顶推船推轮的排水量.本次试验及其数据预报的极值可供设计同类型铰接装置的江海通航顶推船时参考使用.     

海上自升式平台动力分析方法研究(英文)

A jack-up platform,with its particular structure,showed obvious dynamic characteristics under complex environmental loads in extreme conditions.In this paper,taking a simplified 3-D finite element dynamic model in extreme storm conditions as research object,a transient dynamic analysis method was proposed,which was under both regular and irregular wave loads.The steps of dynamic analysis under extreme conditions were illustrated with an applied case,and the dynamic amplification factor(DAF) was calculated for each response parameter of base shear,overturning moment and hull sway.Finally,the structural response results of dynamic and static were compared and analyzed.The results indicated that the static strength analysis of the Jack-up Platforms was not enough under the dynamic loads including wave and current,further dynamic response analysis considering both computational efficiency and accuracy was necessary.     

桥梁活载内力分析可视化研究初步

可视化方法可有效处理数值分析的结果。提出了两种利用可视化方法分析桥梁活载内力的可行方式，完成了其中一种的程序实现，并结合实例介绍了其工程应用。     

喷砂技术在高速公路路面处理上的应用

喷砂技术是利用喷砂机产生的高速砂流抛射工作表面在冲击力作用下进行不接触式的表面处理技术。在其他领域已有应用,但较少应用于高速公路路面处理。就喷砂技术应用于高速路面处理进行理论上的探讨和实践性尝试,包括旧标线清除,路面喷洒沥青后清除泛油,改善抗滑性能,较大坡度、转弯路面的表面拉毛,提高抗滑性能等。