T梁XYPEX防腐的设计理念和施工质量控制

海洋环境下混凝土的耐久性问题一直为工程界所关注,根据工程实践,介绍某码头工程T梁采用XYPEX(赛柏斯)渗透结晶型混凝土涂层涂料进行防腐设计的新理念,结合新理念进行全新的防腐施工,目的是提高混凝土在海洋环境下的使用寿命,提高混凝土的耐久性,同时为类似工程提供借鉴。     

超声降解废水机理及空化气泡运动过程数值模拟

阐述了超声降解废水的机理,并根据以体积作为动力学参数的气泡动力学模型进行数值模拟,结果表明,低频下的空化强度更大,更有利于降解过程,而驱动声压和初始气泡大小则存在一个最佳值,同时与传统的R-P方程作了比较,两个模型模拟结果基本一致,表明本文所用模型也适用于对气泡运动过程的模拟.     

船舶压载水处理系统

较详细地介绍了三种符合国际海事组织（IMO）压载水排放标准的压载水处理系统。为2009年以后设计建造的新船以及2016年底前全部现有船舶的改装设计提供了新装备、新技术的线索,值得关注。     

最小二乘平差在纸海图矢量化过程中的应用

在矢量化纸海图时,由于基准点的采样误差,导致转换参数的误差,最终导致电子海图的空间对象的精度不高。本文应用最小二乘法对基准点的采样误差实施平差,提高转换参数的精度,最终可较大幅度地提高电子海图中空间对象的精度     

钢丝绳失效机理分析及改进举措

微动疲劳与腐蚀疲劳是造成钢丝绳失效的主要原因。选用纯净度高的帘线钢盘条为原料制造钢丝绳,并对制绳钢丝进行表面处理,提高钢丝的防腐蚀、耐磨损性能,同时通过改进设备和工艺提高捻制质量,可大幅度地提高钢丝绳的质量和使用寿命。光面钢丝绳或将被淘汰。     

基于PumpLinx的鱼雷齿轮泵内部流场及流量特性的仿真分析

为研究转速与流体介质对齿轮泵性能的影响,运用PumpLinx软件对齿轮泵内部流场及其流量进行瞬态仿真分析,并与试验数据进行对比,分析转速与流体介质对齿轮泵内部压力场及输出特性的影响。数值结果表明:齿轮泵平均流量与试验数据吻合较好,入口流量随时间呈锯齿状波动,出口流量则呈波浪状的较小波动,而且流量脉动率随转速的增大而减小;齿轮泵内压力从低压腔呈阶梯状向高压腔过渡,且入口易因超低压而出现空化现象,导致其压力脉动率高于出口。此外,流体介质为水时的流量脉动率略低于油。研究结果为降低鱼雷齿轮泵的振动和噪声等危害提供了理论指导。     

Corrosion rate measurements in steel sheet pile walls in a marine environment

Corrosion of steel structures in the marine environment is a major problem. The deterioration of this kind of structures is costly and difficult to predict both when designing new structures and when estimating the remaining service life time for existing structures. The aim of this investigation was to find indicative values for the corrosion rate of steel sheet piles on the Swedish west coast. Such corrosion rates (mm/year) can be used both when designing new structures by oversizing the steel thickness and when estimating the bearing capacity of existing sheet pile structures. Earlier investigations on the corrosion rates along the Swedish east coast – with salinity from about 0.2% to 0.8% – are still used today as guidelines for the corrosion rate of all steel structures in the Swedish maritime environment even though the salinity on the west coast can be as high as 3.0%.Steel sheet pile wharfs located in the port of Halmstad on the Swedish west coast were inspected by ultrasonic measurements. Three wharf structures with a total length of about 700 m were inspected. None of the inspected wharfs had or have had cathodic protection. The thickness measurements of the steel sheet pile structures were performed by divers.The age of the three inspected sheet pile structures ranged from 36 to 51 years. The dimensions of the original sheet pile sections are known. One of the quay structures is located along a river. The salinity at all wharfs varied from low values at the surface to approx. 2% at the bottom (also in the river outflow).The measured average corrosion rates were in the same order as the design values in the European code. However, the results indicate increased corrosion rates about 1 m below the mean water surface and at the level of the propellers from the ships berthing the most frequented of the inspected wharfs, 3–6 m below water surface.The tolerances of steel sheet thicknesses – usually in the order of ±6% – are often neglected when investigating the remaining thickness in steel sheet piles. A simple calculation model shows that the sheet pile must be almost 50 years of age before an accurate estimation on the corrosion rate can be made, considering the tolerances, if the true original sheet pile thickness is not known.     

锈蚀钢筋混凝土梁抗弯承载力计算及破坏截面预测

通过锈蚀钢筋混凝土梁抗弯承载力试验,在已经提出的基于锈胀裂缝宽度的锈蚀率计算方法基础上,根据承载力试验结果建立了基于计算锈蚀率的锈蚀梁承载力计算方法,同时提出了锈蚀梁危险截面位置的预测方法,与已有研究成果的对比表明,该方法具有良好的准确性和实用性,可以为锈蚀梁残余承载力和危险截面的预测提供参考。     

CT扫描技术在混凝土结构检测中的应用

为了解CT扫描技术在工程检测应用中的可行性及优越性,特别选取预制典型裂缝、疲劳加载、锈胀裂缝及现场混凝土构件,对其进行CT扫描室内试验,获得构件典型病害CT图像。试验分析表明:CT扫描成像能直观体现混凝土内部的缺陷和破损情况,并能对缺陷和破损进行定量分析,可见该检测技术应用效果良好。随着CT扫描仪器的发展,便携式CT将成为可能,CT扫描技术在混凝土结构检测中必将占有重要的地位。     

船体结构腐蚀凹坑焊补修复技术研究

针对船体结构腐蚀凹坑修复问题,利用热-力耦合弹塑性数值计算技术,研究了焊补修复方法,对较大面积和深度坡口的厚壳体凹坑多道焊接过程进行模拟计算,掌握壳体凹坑修复过程中温度场和应力场分布规律,得到最佳工艺参数,并利用试验进行验证.结果表明,采用数值计算方法可较准确预测焊接的温度场和变形以及厚板结构的残余应力,为工艺参数的制定提供重要依据.