预应力混凝土方桩吊装技术在高桩码头中的应用探析

文中以福州港可门作业区4#、5#泊位码头与引桥工程施工方案为基础分析了预应力混凝土方桩吊装技术在高桩码头中的应用。并且根据预应力混凝土方桩吊装技术的一些特点和具体工程施工情况提出了预应力混凝土方桩吊装技术在高桩码头中的应用要点。     

秦皇岛港20万吨级矿石码头航道建设可行性简析

<正>秦皇岛港目前新建有一个20万吨级矿石专业码头304泊位,另外还有一个改造过的杂货泊位进行铁矿石装卸作业。需要说明的是,现有新建20万吨级矿石专业码头匹配的航道是10万吨级航道,所以,新建20万吨级矿石专业码头实际应用只能相当于10万吨级矿石专业码头,码头泊位吨级和相应航道吨级不匹配,难以适应     

矿石码头续建工程装卸工艺系统设计

黄骅港散货港区矿石码头一期续建工程规模大,专业性、综合性和自动化程度高,在国内矿石港口工程中具有较强的代表性。通过总结先进、成熟可靠的装卸工艺系统设计和建设情况,以及主要装卸设备的选型、技术参数和关键技术应用情况,提出了矿石码头续建工程装卸工艺系统设计方案,可为国内类似矿石码头建设提供参考。     

青岛港20万吨级矿石码头计算机管理系统的开发与应用

介绍青岛港20万吨级矿石码头计算机管理系统的设计及计算机管理系统在现代化矿石码头中的应用。     

大连港矿石码头项目中外合资的影响分析及相关建议

通过大连矿石码头功能地位的分析,揭示了合资经营矿石码头对全国进口铁矿石接卸系统和对我国东北地区矿石接卸系统的影响,并提出了相关的建议。     

大型矿石码头生产能效分析系统

为提升矿石码头能效管理水平,建立大型矿石码头生产能效分析系统。系统依据现有矿石码头装卸流程和能效精细化管理需求,引入物联网相关技术,集能源数据采集、分析于一体,实现矿石码头生产能效的在线分析和能耗预警的目标。     

烟台港西港区大型深水矿石码头开建

3月17日上午,烟台港集团举行西港区大型深水矿石码头开工典礼。该码头建成后,将彻底结束烟台港缺乏大型、深水、专业矿石码头的历史,烟台港将发展成为中国北方重要矿石进口港和矿石贸易接转港。     

抗冰墩在曹妃甸矿石码头一期工程中的应用

详细介绍了在曹妃甸矿石码头一期工程中抗冰墩结构的应用和施工工艺.     

浅谈巴西矿石码头设施

介绍了巴西矿石资源以及矿石的生产体系,阐述了巴西PDM港的港口设施、装卸工艺和船舶吨级情况;针对巴西ULOC船型,论证了国内现有大型矿石码头接卸该船型在技术方面的可行性。可供国内矿石码头设计参考。     

PHC嵌岩桩在某电厂重件码头工程中的应用

近年来,预应力高强混凝土管桩(PHC)以其力学性能良好、价格低廉等优势,越来越多地应用在大、中型港口码头的建设中。结合某电厂重件码头工程的设计实践,重点介绍在本工程中应用预应力高强混凝土管桩(PHC)的一些体会,供类似工程设计参考。     

潜艇内部平面舱壁极限承载能力分析

通过对潜艇内部平面舱壁结构在破舱工况下的双重非线性有限元计算,以梁的塑性铰机构理论为基础,揭示了舱壁水平大梁的塑性破坏机理—水平横梁形成四塑性铰极限机构,最终确定其极限承载能力。同时,对舱壁水平大梁抽象出的简单梁进行了极限承载能力的分析,并与舱壁水平大梁进行比较,提出了舱壁水平大梁形成的极限机构不同于简单梁极限机构—三塑性铰机构的原因。     

空间扭面钢箱梁制造技术

结合景观人行桥纽带型扭面空间结构连续梁的特点,介绍钢箱梁整体采用反造、翻身复胎的匹配方式、精确控制梁段线形的制造方法。施工工艺的不断优化,使本工程钢箱梁的制造工艺突破了传统的预拼装技术,保证了施工质量,提高了生产效率,节约了制造成本。     

苏通大桥75 m跨连续箱梁节段预制高精度控制技术

简要介绍75m跨连续箱梁预拱度设计、箱梁节段预制高精度几何线型控制技术和几何数据采集及控制，说明预制箱梁时预制单元的定位，几何控制测点的布置及测量容许误差控制指导原则以及预制过程中的误差调整方法。     

短线匹配法箱梁预制悬拼施工技术

介绍了短线匹配法预制悬拼施工技术的特点、工艺原理、控制要点,结合苏通大桥施工实例,重点分析了箱梁施工中受力特点和线形控制要点以及改进措施,为其它类似工程提供一些借鉴。     

船体梁极限强度非线性有限元计算方法研究

文章针对Dow 1/3比例护卫舰模型,进行多种方案的船体梁极限强度非线性有限元计算,通过与Smith方法和模型试验结果的对比分析,研究船体梁极限强度非线性有限元建模技术,给出一种较为准确高效的船体梁极限强度非线性有限元计算方法。对于完善《船体梁极限强度的非线性有限元方法计算指南》具有一定的参考价值。     

Plastic mechanism analysis of structural performances for stiffeners on bottom longitudinal web girders during a shoal grounding accident

A theoretical model is introduced in this paper for structural performance of stiffeners on double-bottom longitudinal girders in a shoal grounding accident. Major emphasis is placed on establishing the characteristic deformation mechanism of stiffeners and identifying major energy dissipation patterns. Numerical simulations using the LS-DYNA nonlinear finite-element program were carried out to examine thoroughly the progressive deformation process during sliding deformation. Stiffener deformations were observed to fall into two categories: stiffeners fully contacted with the indenter, and stiffeners subjected to indirect deformation due to energy transfer from attached girders. Grounding performance of stiffeners is substantially influenced by that of the attached plating, and therefore a review of the existing deformation models of longitudinal girders (i.e. Simonsen 1997, Midtun 2006 and Hong 2008) was included. Hong's model of bottom girders was found not capable of representing the effects of stiffeners, and a new model of girders was thus developed. Based on observation of the numerical deformation process and the new analytical girder model, a kinematically admissible model of stiffeners on bottom longitudinal girders was built. Using the methods of plastic mechanism analysis, simplified analytical expressions for energy dissipation by girder-attached stiffeners, both fully contacted and noncontacted, were formulated, and equations for grounding resistance were subsequently obtained. The theoretical expressions agree favorably with results from nonlinear finite-element simulations and capture two significant characteristics of the problem: that energy varies little with indentation for stiffeners that fully contacting the indenter, and that energy is independent of slope angle for indirectly deformed stiffeners. The proposed theoretical model helps to predict analytically shoal grounding performance of stiffeners on longitudinal girders with reasonable accuracy.     

Simplified analytical method for evaluating web girder crushing during ship collision and grounding

The paper presents a simplified analytical method to examine the crushing resistance of web girders subjected to local static or dynamic in-plane loads. A new theoretical model, inspired by existing simplified approaches, is developed to describe the progressive plastic deformation behaviour of web girders. It is of considerable practical importance to estimate the extent of structural deformation within ship web girders during collision and grounding accidents. In this paper, new formulae to evaluate this crushing force are proposed on the basis of a new folding deformation mode. The folding deformation of web girders is divided into two parts, plastic deformation and elastic buckling zones, which are not taken into account for in the existing models. Thus, the proposed formulae can well express the crushing deformation behaviour of the first and subsequent folds. They are validated with experimental results of web girder found in literature and actual numerical simulations performed by the explicit LS-DYNA finite element solver. The elastic buckling zone, which absorbs almost zero energy, is captured and confirmed by the numerical results. In addition, the analytical method derives expressions to estimate the average strain rate of the web girders during the impact process and evaluates the material strain rate sensitivity with the Cowper-Symonds constitutive model. These adopted formulae, validated with an existing drop weight impact test, can well capture the dynamic effect of web girders.     

50t—50m岸连集装箱起重机

介绍了50t－50m岸边集装箱起重机的主参数及设计特点,该机采用双梯形梁、前拉杆设置偏心套、在轨道底面与际轨梁之间敷设橡胶垫,前后大梁的铰接采用主副铰结构,以确保小车在高速重载时平稳通过大梁铰点。     

船底板架重量的优化

本文以某一货船的底部板架作力参考板架,进行重量优化,探讨了纵桁数目、肋板数目、许用应力、纵桁位置等因素对板架最小重量的影响,对约40个板架设计作了优化计算。在文中采用了新的板架计算方法和新的非线性规划方法。计算表明,对板架的最小重量存在着最佳的纵桁数目和最佳的肋板数目,而设计应力稍加提高,有可能节省较多的重量。     

浅析预应力混凝土连续箱梁裂缝产生的原因

文章就江苏省杨溧高速公路某标段现浇高标号预应力砼连续箱梁裂缝产生的原因、施工应该注意的事项进行了较为详细的阐述,以供同类型桥梁施工参考。