"圆齿-共轭曲线"内啮合齿轮泵的齿廓设计和大圆弧拟合

以无填隙片结构的1齿差内啮合齿轮泵为例介绍共轭齿廓的求法及拟合;强调了曲线的内、外包络是其内、外法向等距线而不是平行等距线的概念.给出了"圆齿-共轭曲线"齿廓的解析解及工程实用的高精度圆弧拟合实例.     

柔性支护在渐进式浅层滑坡中的应用

结合宜章大道工程,阐述渐进式浅层滑坡的地质特征,通过柔性支护处治与传统处治方法对滑坡边坡处治的适宜性对比分析,总结柔性支护处治具有施工快捷、经济、安全、环保等特点;并根据本项目具体情况,介绍柔性支护处治实施情况和处治效果,验证了柔性支护技术的可行性与优越性。     

大连北良60万吨钢筋混凝土筒仓滑模施工

本文介绍了大连北良60万吨钢筋混凝土粮食筒仓工程中直径32m，高度45．8m单仓容量3万吨的世界领先规模的筒仓滑模施工工艺，其中特别介绍了施工中有关柔性平台的设计及应用、筒仓垂直度、圆度、偏移的测控等几项关键技术的解决和应用效果。     

大连北良60万吨钢筋混凝土筒仓滑模施工

本文介绍了大连北良60万吨钢筋混凝土粮食筒仓工程中直径32m．高度45．8m单仓容量3万吨的世界领先规模的筒仓滑模施工工艺．其中特别介绍了施工中有关柔性平台的设计及应用、筒仓垂直度、圆度、偏移的测控等几项关键技术的解决和应用效果。     

500吨级半分节运油驳

本文介绍500吨级半分节运油驳设计中，用绘制浮力和重力分别随舭圆半径的变化曲线，从而确定排水量、舭圆半径，快速优化线型的方法。     

局部切割法诊治预应力混凝土现浇箱梁病害施工技术

分析了某互通主线桥预应力变截面连续箱梁局部混凝土强度不足、露筋、空洞等病害成因,通过全面质量检测,判定了整个梁体的质量状况,确定了经济、合理的局部切割诊治方案,并介绍了该方案的施工工艺。经荷载试验表明,梁体完全满足设计及使用要求。     

土工合成材料在防治桥头跳车中的应用

针对高等级公路路桥过渡段出现桥头跳车病害,本文根据福银高速南平段一期建设的实践,通过对土工合成材料处治桥台跳车方法的作用机理与施工方法的阐述,介绍了处治桥台跳车方面的新举措。     

高速公路水泥混凝土路面主要病害的成因及处治

对高速公路水泥混凝土路面主要病害的成因进行了综合性分析,并结合养护工程实例对病害处治方法及其施工工序及注意事项作了介绍。经1年多的观察,证明其处治效果较为明显,不仅可以延长道路的使用寿命,减少养护费用,同时提高了养护效率。     

既有混凝土桥梁结构病害缺陷分析与处理

本文通过几个地区旧桥运营情况的调查结果,对目前混凝土桥梁结构所存在的主要病害进行了较全面的分析,并提出了相应的处治措施。同时结合井冈山大桥的维修加固工程实例,介绍了各病害处治措施的综合应用情况,取得了较好的加固效果。     

简支箱梁静载试验与分析

简支箱梁静载试验是为了验证设计方法的可靠性，检验施工质量，判断梁体的整体受力性能和承载能力是否达到设计和规范的要求。结合工程实例介绍了铁路预应力混凝土简支箱梁的数值分析和静载试验的方法和结果，试验与理论分析后表明，梁体理论分析和设计计算方法可靠，施工质量优良，箱梁刚度和承载能力满足要求。     

梁结构的振动响应研究

研究有限均匀欧拉梁结构的振动响应。梁结构包括单跨梁和具有中间支座支撑的多跨梁结构。采用波动分析法来分析梁结构的振动响应。梁的边界条件采用边界阻抗来定义,建立了求解标准边界条件下有限梁结构在简谐外力激励时响应的统一方程,为分析计算具有标准边界条件的梁结构振动响应奠定基础。     

A statistical investigation of time-variant hull girder strength of aging ships and coating life

Risk- and reliability-based approaches are increasingly being applied in assisting inspection and maintenance planning. One of the keys to such approaches is properly predicting the hull girder strength (HG) of gradually degradated hull structures. The development has been limited by the lack of data on aging ships—validation of the developed methods has not been possible. To fill the gap of knowledge on hull strength of ships in service, this paper presents a database of as-gauged hull structures and a statistical study of the time-variant HG of tankers. The expanded data set was collected from 2195 as-gauged girth belts (transverse sections) of 211 single-hull tankers that were 12–32 years old. It was intended to (1) provide actual data on hull girder section modulus (HGSM) of tankers, (2) investigate the general trends of the change in the HG over ships’ service life, and (3) propose formulations for presenting time-variant HGSM and coating life.

The data set demonstrated a high variation of HGSM that changed over time. The mean value and standard deviation of HGSM loss were derived as functions of time. The probability density function (pdf) of coating life was also derived. Comparisons were made between previous studies on HG and the current data set. It was found that almost all previous studies showed much greater HG loss than what this database revealed. The refinement of existing calculations appears to be needed. The data set and statistical study were expected to form the basis for validating formulations of HG that are key components in risk- and reliability-based approaches.     

肋形板梁式液体化工码头桩台结构研究

针对液体化工码头桩台无有轨装卸设备荷载、竖向使用荷载小且水平荷载较大的特点,提出了肋形板梁式液体化工码头桩台结构。通过计算分析及构造处理可以得出,肋形板梁式结构是一种安全可靠、整体性好、预制安装程度高、施工快捷且造价较省的结构形式,具备良好的应用前景,可为实际工程提供一种供比选的结构形式。     

先张法预应力空心板梁的应用

先张法预应力空心板梁经过多个工程实践已基本形成标准化构件,其在跨度、对荷载的适应能力、有效改善长栈桥对水流的影响和造价等方面比普通梁板有较大的优势。     

Analysis of the hull girder vibration by dynamic stiffness matrix method

1 Introduction1 The excitations of the main engine and propellers may induce harmful vibration of the ship. To avoid resonance, the overall natural frequencies and responses of the ship hull must be calculated firstly, and the results can be taken as the …     

32m箱梁模型拼装质量控制技术

32 m箱梁模型是分段拼装而成的整体刚性模板,全套模型由底模、侧模、端模、内模四部分组成,其拼装成形后的质量对箱梁的外形外观质量是否达标起到关键性的作用。对32 m箱梁模型拼装过程中存在的质量问题进行分析调查,找出影响模型拼装质量的关键性因素,并制定相应的控制方法,以提高模型的拼装质量。     

Incorporated probability that a fleet meets a given permissible value for the hull girder section modulus loss

The paper presents a study on the incorporated probability that a tanker fleet meets a given permissible value of hull girder strength loss. The analysis was based on a database of hull girder section modulus (HGSM) for as-gauged girth belts of tankers. It was found that its mean value is below 5% over the entire life span of the analyzed tanker fleet. The Weibull probabilistic distribution was found to best represent the time-varying HGSM loss. A method was developed for calculating the incorporated safety of a fleet. As an example, the IMO requirement for a maximum HGSM reduction of 10% relative to its required value was analyzed, accounting for time-variant HGSM loss and including a probabilistic model for coating longevity. The views expressed in the paper are those of the authors and not necessary those of ABS.     

横向深水梳式滑道井字梁及轨道安装技术

武船滑道项目井字梁及轨道安装区域处于长江主航道一侧,水深流急,水下轨道安装精度要求高,安装工期压力大。介绍井字梁预制、井字梁预拼装、水下井字梁安装等工序中施工与过程测量控制相结合的技术,为今后类似梳式滑道工程提供借鉴。     

钢箱梁板单元件变形火工矫正技术

火工矫正是钢结构领域生产实际中对焊接变形进行矫正的常用方法。本文针对钢箱、梁桥和梁板单元件各类变形形式,详细介绍了加热顺序、位置、温度、形状等火工矫正参数,以及不同变形形式下采用的不同矫正方法,并分别对其矫正工艺进行了阐述。     

应用三维千斤顶精确安装海上大型预制箱梁施工技术

随着码头建设逐步迈向深水化、外海化,带动上部预制梁板向大型化发展,但外海海况恶劣,传统起重船安装工艺无法保证精度。以青岛港董家口港区40万t矿石码头为例介绍外海精确安装500 t预制箱梁的整套施工工艺,主要包括采用海上塔吊、三维千斤顶与调梁扁担结合使用等。该工艺的成功实施,为海上大型预制箱梁的安装开辟了新思路。