Simulation and Reasonable Design of Bridge Steel Fenders to Reduce Ship Impacts

Steel fenders are increasingly used for ship-impact resistance structures in the design of navigable bridges. As an important approach to investigating this anti-impact structure effectiveness to reduce influences of vessel impact, simulation analyses are still not perfect yet. So this paper is intended to discuss several issues related to ship collision simulations, including steel constitutive relationship, connections between steel box and pile cap, contacts definition and friction consideration, and the determination of impact waterlines and angles. Consequently based on two examples of ship-steel fender-bridge structure systems, some conclusions about effectiveness and design of fenders to reduce ship impact are drawn.     

Smart3D船舶设计软件开孔管理系统研发

船体结构舾装开孔是船体专业与舾装专业协同设计的重要组成部分.为了加强协调能力、规范开孔流程、实现开孔数据的管理,通过分析鹰图船舶设计软件Smart 3D(S3D)的二次开发能力和船舶跨专业协同设计流程,结合邮轮设计和船厂设计实际生产业务的需求,利用S3 D二次开发框架,制定开孔协同处理规则,结合数据库设计,开发出统一的...     

单层钢结构厂房结构优化设计方法探讨

单层钢结构厂房是工业厂房应用范围最广的一种。针对此类厂房的特点,在总结设计经验的基础上,从结构专业的角度出发,为了使设计经济合理,降低造价,对结构设计进行了优化方法的探讨。     

地铁车站基坑围护结构的施工监测与分析

以郑州市地铁一号线西三环车站基坑为研究背景,通过对该基坑围护结构监测方案的设计,并对整个施工过程中围护结构桩体的水平位移、坑周地表竖向沉降以及钢支撑的轴力实施监测。监测数据分析表明：钢支撑能有效的减小围护结构的侧向变形;距离基坑越近,坑周地表沉降量也越大。总体来说,运用钢支撑联合钻孔灌注桩的围护形式稳定性良好,该围护结构的设计满足该工程的安全要求。     

基于Q235生产工艺实施B级船板的试验轧制

测试了Q235碳素钢板与B级船板的性能差距,通过成分设计和控制轧制,在试验轧机上开发了B级船板钢,性能达到中国船级社的要求。分析表明:严格控制S,P的含量,并进行适当的控轧,可以显著提高船板的冲击韧性,并使组织更加均匀和细化。     

高职建筑工程技术专业钢筋模型制作教学创新

钢筋模型制作,是用一些电线之类的材料代替钢筋,将结构施工图中平面的结构设计转化缩放为立体的三维模型,这样更加直观的立体表达,既节约钢材,又降低成本。     

基于有限元分析方法的吊钩优化设计研究

将有限元分析方法和优化设计理论相结合,以ANSYS软件为工具,构建了倾翻吊钩的优化设计模型,以参数优化和形状优化相兼容,在保证安全性的前提下,优化了倾翻吊钩的结构参数和结构形状,大幅度地减轻了钓钩材料的消耗,为该类吊钩的设计探索了新的方法,该优化设计的结果已在某钢铁企业投入使用．     

A nonlinear dynamic macro-element for demand assessment of bridge substructures subjected to ship collision

For the dynamic demand assessment of bridge structures under ship impact loading, it may be prudent to adopt analytical models which permit rapid analysis with reasonable accuracy. Herein, a nonlinear dynamic macro-element is proposed and implemented to quantify the demand of bridge substructures subjected to ship collisions. In the proposed nonlinear macro-element, a combination of an elastic-plastic spring and a dashpot in parallel is employed to describe the mechanical behavior of ship-bows with strain rate effects. Based on the analytical model using the proposed macro-element, a typical substructure under 5000 deadweight tonnage (DWT) ship collision is discussed. Our analyses indicate that the responses of the structure using the nonlinear macro-element agree with the results from the high resolution model, but the efficiency and feasibility of the proposed method increase significantly in practical applications. Furthermore, comparisons between some current design codes (AASHTO, JTGD60-2004, and TB10002.1-2005) and the developed dynamic analysis method suggest that these design codes may be improved, at least to consider the effect of dynamic amplification on structural demand.     

CAD技术在钢结构设计中的应用

通过总结CAD技术在钢结构领域的应用，指出CAD技术在钢结构设计中存在的若干问题和解决途径。     

多层交错桁架钢结构住宅的设计分析

国内多层钢结构住宅体系尚处于探索阶段.通过对一多层交错桁架钢结构住宅建筑工程的设计分析,介绍了该结构的设计方法、受力特点及适用性,表明交错桁架钢结构应用于多层住宅是一种值得推广的结构体系.     

钢筋网尺寸参数对配电房母排磁场屏蔽效能的影响研究

住宅小区的配电房内母排会对上层住户空间及邻近建筑物产生电磁干扰,因此需采用一定的屏蔽方案对其进行屏蔽。钢筋混凝土结构常被用来屏蔽母排产生的磁场,而不同尺寸大小的钢筋网其屏蔽效能不同,实际工程屏蔽方案需综合考虑成本与屏蔽效能。文章中以一典型配电房为俐,根据母排实际参数建立其工频磁场计算模型,分别计算了建筑物只采用混凝土（不带钢筋同）、采用不同大小的钢筋网格以及不同型号的钢筋时,母排在上层住户空间产生的磁场,并计算了各种辱蔽措施的屏蔽效能。计算结果显示钢筋网格越小,屏蔽效能越好;钢筋直径增大,屏蔽效能也明显增大。     

Numerical Simulations of Pile Supported Protective System Subjected to Ship Impact

The head-on collision process between ship and concrete pile supported protective system is simulated by software LS-DYNA. The influences of pile non-linearity and soil non-linearity on impact force, ship crush depth and the cap displacement of pile supported protective system are discussed. It's shown that for both severe impact case and non-severe impact case, the non-linearity of pile material influence the impact force history, ship crush depth. The non-linearity of pile material and soil has remarkable influence on the cap displacement especially for severe impact case. These issues should not be ignored in the analysis of pile supported protective system subjected to ship impact.     

金华地区受台风影响特点与工程防护对策研究

金华市位于浙江省中西部,虽为内陆地区,但从整个大环境看仍处中国东南沿海,在福建及浙江沿海登陆的台风均易对金华地区产生影响。结合历年台风统计资料,台风对金华地区有风力大、短时强降雨的影响。强化结构抗风设计,尤其要重视附属结构、临时结构的抗风设计,可以减少风力破坏;进行工程防护可以减少短时强降雨带来的负面影响,防止山洪、滑坡、泥石流、城市内涝等灾害的发生。     

沿海游艇上建幕墙结构设计

随着世界经济水平的不断提高,人们对海洋旅游的需求明显增加.时尚大方的沿海游艇玻璃幕墙成为船东们的新选择,然而船级社规范中并未对此类结构有明确规定.以某沿海游艇项目为例,对比内河船舶玻璃幕墙结构设计方法,探讨沿海游艇玻璃幕墙结构的设计方法,并借助有限元分析手段,验证其在海船项目中应用的可行性.结合有限元计算结果,提出幕墙结构设计中需要注意的问题.     

行李传送车车身设计及工艺

针对现有行李传送车车身为多片钢板拼焊而成,存在零件多、工序多、焊缝质量难保证、加工成本高等问题,通过对现有车身结构可折弯加工区域的整合分析,提出车身结构设计的新方案,并在保证工艺强度的前提下,减小了车身钢板厚度;结合新的车身结构设计方案,提出钣金折弯的生产工艺。     

彭水水电站升船机主提升系统设计浅议

升船机的设计是一项复杂的系统工程,彭水水电站升船机在设计之初,广泛吸取借鉴国内外相关行业的先进理念,同时参考国内升船机运行管理单位的相关运行、维护管理经验,全面比较,优化设计,尤其是对升船机主提升系统的设计进行了认真细致的优化,效果明显。本文主要就彭水水电站升船机主提升系统的设计思路、控制要求、保护策略等进行了分析,可为大中型升船机主提升系统的设计提供一些有益的经验和借鉴。     

带钢热轧的张力控制器的设计与实现

稳定张力控制是批量薄规格热轧钢板生产的关键技术。为了提高轧机张力控制质量,减少堆钢现象,建立一种带钢热轧张力控制模型,以此为基础设计一种张力控制器,改善活套控制性能,提高活套的稳定性,从而有利于大批量轧制薄规格带钢。     

An examination of the relationship among structure,trust, and conflict management styles in virtual teams

The emergence of new technologies has made it increasingly easy for distributed collaboration in both educational and noneducational settings. Although the effectiveness in traditional settings of the dynamics of small group work has been widely researched, there is limited research that offers evidence on how teams can work effectively in a virtual environment. The purpose of this study is to examine the relationship among team structure, trust, and conflict management style, in addition to their impact on teamwork effectiveness in a virtual environment. An experimental design was used to assess the effects of structure on team performance. Forty‐four groups, divided into hierarchical and nonhierarchical groups, worked on an online simulation project in an online MBA course. The results suggest that team structure is strongly associated with team performance, whereas trust and a collaboration conflict management style contribute to teamwork satisfaction.     

Retrofit of Ressalat jacket platform （Persian Gulf） using friction damper device

A friction damper device (FDD) is used for vibration control of an existing steel jacket platform under seismic excitation. First, the damping is presented for vibration mitigation of structures located in seismically active zones. A new method for quick design of friction or yielding damping devices is presented. The effectiveness of the damping system employing such FDDs in a jacket platform is evaluated numerically. The influence of key parameters of the damping system on the vibration suppression of the offshore structure is studied in detail. To examine the vibration control effectiveness of the FDD for the jacket platform, performance of the controlled structure under the seismic forces is studied using numerical simulations. A parametric study is undertaken to discover the optimized slip load and brace area of the FDD. It is shown that the FDD is effective in mitigating the dynamic responses of the offshore platform structure.     

船舶发电柴油机电子调速系统建模与仿真

在研究船舶发电柴油机调速系统的结构和工作原理的基础上,建立了电子调速系统的数学模型,根据所建立的数学模型,构建了了仿真模型,并进行了突加负载和突卸负载实验,仿真结果比较理想,符合《钢质海船入级规范》规定的标准．