The Lingdingyang Bridge is a three-span steel box girder suspension bridge with a main span of 1666 m on Shenzhen-Zhongshan Link. The main pier cap is 36m in diameter and 8m in height. The double-walled steel hanging box is used as the temporary cofferdam and permanent anti-collision box for the cap. The inner diameter of the steel hanging box is 36.2m, the height is 16m, and the weight is 1783t. During the construction process, the system changes frequently and the stress is complex. A finite element model of the whole construction process is built to analyze the forces during the lifting up, integral lowering, bottom cover pouring and cover pouring. The finite element calculation results are compared with the actual monitoring results on site, and the two are close. At the same time, the MSC. Dytran calculation software was used to simulate the anti-collision effect of the steel gondola when a 100,000 t ship was impacted from the front and side, and it was found that the maximum impact force was reduced by 5.6% and 7.4% respectively during the frontal and side impacts. The structural design of the steel hanging box is reasonable, and the overall calculation method and construction method are reasonable and feasible.
作为海洋风电基础,吸力筒在我国海洋地质环境具有广泛的应用前景.因需嵌入海洋土中以提供上部风机稳定性能,故而其将受到由波浪、流等导致的随机循环载荷作用.然而国际范围内,尚未有被广泛接受的循环载荷下吸力筒承载的分析方法.鉴于此,本文基于损伤理论,采用雨流计数法,将随机循环载荷转换成系列规则的循环载荷,并结合UDCAM-s模型,以及应变累积和循环等效周次的概念,以考虑循环载荷对软黏土的累积循环软化效应,建立了一种能考虑随机循环载荷作用的吸力筒承载特性分析模型.进一步开展分析,对比了极限工况下考虑循环载荷与否的吸力筒承载力变化;量化了正常工作下吸力筒的累积变形和转角,为吸力筒的工程实际提供了设计思路.
随着城市的发展与扩张,港城矛盾日益突出,国内沿海及内河老港的转型升级也逐步增多.在老港转型升级的过程中存在城市规划完全忽略港口或者港口改造制约城市发展的问题,需要结合港城一体化的发展思路来分析总结老港的转型升级.为了更好地研究我国未来相关港口与城市一体化发展的方向及思路,通过对国内外典型古港转型案例的分析总结,提出了城市包围港口、城市与港区平行、港口远离城市等三种不同港城一体化模式下老港的转型升级方向.
为满足生产发展和码头靠泊作业安全的需要,对张家港油品码头进行升级改造.根据原有码头平面布置和结构现状,采用局部加固方式,通过增设 10座系靠墩与原有码头相结合,新建 2座靠船作业平台,并进行相应的附属设施改造,使原码头从靠泊 1万t级油品码头升级为 5万t级油品码头.设计方案根据工期要求、系泊特点及工程现状,在对既有码头结构体系进行加固改造时通过计算分析提出了简易的分配系数取值方法,并结合工程特点制定了复杂狭窄水域的沉桩工艺流程,相关成果可以为类似工程提供参考.
为适应山区水位大变幅、陡涨落和枢纽泄洪的影响,急需提出适应这些复杂水文条件的装配式大水位差架空直立式结构.为此在分析传统钢筋混凝土工作特性的基础上,提出了钢管钢筋混凝土组合装配式结构,并对装配式钢结构的工作特性进行了深入探讨.通过对装配式钢和钢筋混凝土结构节点工作状态、纵横钢结构与钢筋混凝土连接特性、主要构建的工作状态分析,山区钢和钢筋混凝土装配式结构能够很好适应复杂水文和地质条件特点.
