Simulation Analysis on Navigation Indexes of Wanzhou Yangtze River Highway Bridge after the Anti-Collision Device Construction by Ship Model Test

After the anti-collision facility construction of Wanzhou Yangtze River Highway Bridge, the conditions of navigation in bridge area are complex. In order to study the navigation conditions of the reach and layout optimization measures, ensuring the safety of the ship navigation test has been carried out on the ship model navigation in the bridge area. According to the requirements of the maximum safety limit of the ship model test, the paper puts forward the best route, the control method and the difficulty of navigation through the analysis of the test results, and finally gives the recommendations and suggestions.

Design of steel box girder for Taizhou Yangtze River Highway Bridge

Taizhou Yangtze River Highway Bridge is the first three-pylon two-span suspension bridge in China. The main girder adopts flat steamline steel closed box girder which has well wind-resistant capability and is technically mature besides beautiful appearance. Straight web plates of the steel box girder in longitudinal direction are proposed in order to ensure the integrity of the steel box girder, and to keep the stress of the steel box girder continuous in the middle pylon, as well as to reduce the gradient of the middle pylon columns. The cross section of the box girder has one box with three cells. Solid-web diaphragm plate with good integrity and high torsional stiffness is adopted. The lifting lugs are utilized in the anchors of suspender cable. In this paper, selection of the cross section of the steel box girder, the general structure design, local structure design and main structure calculation results of Taizhou Yangtze River Bridge are introduced emphatically.

大跨度连续刚构柔性拱组合桥式研究

宜昌长江铁路大桥主桥采用 130m +2× 2 75m +130m预应力混凝土连续刚构与钢管混凝土柔性拱组合桥式结构 ,大桥全长 2 4 4 6m ,桥型与跨度在世界铁路桥梁中均居领先地位。研究了 130m +2× 2 75m +130m刚构拱受力特性、承载能力、非线性、抗震、车桥动力响应等结构特性。研究结果表明 ,该新型组合桥梁结构 ,梁拱共同受力 ,结构弯矩效应主要表现为拱受压、梁受拉的受力特性 ,主梁承受弯矩及截面尺寸显著减小 ,拱的水平推力与梁的轴向拉力相互平衡 ,使拱与梁在受力方面的优点得以充分发挥 ,结构竖向刚度大 。

大跨度刚构拱桥横向设计参数研究

研究目的:针对宜万线宜昌长江大桥初步设计中横向受力不利的特点,提出4类有效的构造设计措施。通过对横隔板(横梁)的设置位置、构造尺寸等参数的敏感性分析,揭示构造措施的作用机理和效率。根据参数研究成果,提出现行最优构造设计方案,并通过仿真分析验证其可靠性,为同类桥型设计提供参考。研究结论:(1)采用横隔板方案的弹性支承效应对箱梁断面整体受力有一定影响,而采用横梁方案能够简单、直接地改善顶板应力状态。施工设计时应结合二者构造措施的长处,提出组合构造设计方案,全面改善箱梁整体受力性能。(2)从吊杆轴力变化规律可以看出,各计算方案下吊杆轴力基本无变化。这表明,横隔板(横梁)的设置只改变箱梁的横向刚度,对竖向刚度的影响极小。再次验证了横隔板的弹性支承效应只改变箱梁内部的传力途径,对梁、拱的刚度比例无明显影响。

宜万铁路宜昌长江大桥工程通航影响研究

桥梁属永久建筑物,为使大桥建设对桥区河段通航的不利影响降到最小,通过实船试验、通航水力学及船模试验,研究了宜万铁路宜昌长江大桥拟选的两处桥位及各种桥型方案对桥区河段通航条件的影响。结果表明:两处桥位建桥方案,仅桥墩附近及桥墩下游一定范围内流态有所改变,河段内其他部位流态无明显变化,建桥对上游壅水仅在较短距离内产生影响(上游150 m处壅高0.10 m、下游水位建桥前后无变化)。综合分析得出,以2号桥位优化方案为宜。该试验研究,不仅为本工程的设计提供了科学依据,同时也可为国内其它大型跨江桥梁的建设提供参考借鉴。

宜昌长江公路大桥工程专项质量检验评定标准编制与研究简介

结合宜昌长江公路大桥建设实际 ,介绍大跨度悬索桥工程专项质量检验评定标准的编制及标准编制的技术线路。