悬索桥施工猫道的动力特性分析

描道是悬索桥主缆施工过程中作为施工人员工作平台和通道的一种临时性结构，其动力特性是进行气前稳定性分析的基础据此，介绍了猫道振动特性的分析方法，给出了基频的理论计算公式和实用近似计算公式,然后以虎门大桥猫道为例，分析了猫道的动力特性，并将理论计算结果和有限元分析结果进行了比较，在此基础上进一步分析了猫道的设计参数以及风荷载对猫道动力特性的影响     

特大跨径三塔两跨悬索桥的位移特性初探

泰州大桥采用三塔两跨悬索桥方案,以泰州大桥工程为例,分析了三塔悬索桥与双塔悬索桥位移特征的不同点,并研究分析了塔的刚度、高度、主梁高度、矢跨比变化、边中跨比变化对三塔悬索桥位移特征的影响。     

三塔双跨悬索桥动力特性分析

桥梁结构的动力特性对进行桥梁的动力性能设计、健康检测和维护具有十分重要的意义,而三塔双跨悬索桥具有和传统的大跨径悬桥不完全相同的静、动力性能。针对泰州大桥工程实例,通过ANSYS有限元分析软件研究了三塔双跨悬索桥在成桥阶段和施工阶段的动力特性,并与传统的悬索桥作比较,得出了一些有意义的结论,供工程设计人员参考。     

大跨悬索桥加劲梁施工技术探析

大跨悬索桥施工规模庞大,施工难度高,加工构件多,加工周期长,施工时必须合理安排施工计划,并进行分步检测验收,才不致延误工期.本文主要对大跨悬索桥加劲钢箱梁制作、安装的施工技术进行总结,供同行参考.     

悬索桥施工猫道的振动控制

基于万州长江二桥的施工猫道，介绍悬索桥施工猫道的振动方法和机理，建立猫道动力特性分析有限元模型，计算分析制振构造的设计参数对减振效果的影响。结果表明：对于超大跨度悬索桥，抗风缆系统控制猫道振动不够经济；水平制振索控制猫道的侧向振动和扭转振动，提高张力不能增大其减振效果；抗风门架和斜索控制猫道的竖向振动和扭转振动，增大斜索长度，减振效果愈加明显；联结绳可以有效地控制施工人员行走激发的猫道侧向振动。     

大跨悬索桥施工过程颤振稳定分析

随着悬索桥跨径的不断增大，抗风稳定性成为控制桥梁设计与施工的最主要因素。尤其是在施工初期，结构的刚度比成桥要低得多，使得颤振临界风速最低，更容易发散。通过对主梁非对称拼装顺序以及采用临时的水平交叉加劲措施等方法的研究，讨论如何提高桥梁施工过程的颤振临界风速。分析结果表明，当主梁采用非对称施工时，会有效提高结构的等效质量，从而提高临界风速。当采用水平交叉索时，结构的抗扭刚度显著增加，同样增强了桥梁施工过程中的抗风稳定性。     

三塔两跨悬索桥垂跨比与刚度间关系研究

垂跨比是悬索桥的重要影响参数。相关文献表明,垂跨比变化时,三塔两跨悬索桥与常规单跨悬索桥挠度变化趋势相反。针对三塔两跨悬索桥,分析了垂跨比变化时塔顶位移、加劲梁挠度、主缆缆力的变化,进而揭示了"三塔两跨悬索桥垂跨比增大,加劲梁挠度减小"的根本原因。     

大跨径悬索桥结构施工控制技术探究

随着交通事业的发展,急需修建更多的大跨度悬索桥梁以跨越大江、大河和海湾,改变过去凡建大跨度桥梁,必然是钢桥一统天下的局面。为了建桥中不中断通航,不设造价昂贵的河道支架,引入悬索桥的施工方法,逐步完成全桥的施工。文章主要探讨了大跨径悬索桥结构施工控制技术。     

汕头海湾大桥悬索桥下部结构施工技术

汕头海湾大桥是我国第一座现代悬索桥。下部结构主要包括索塔和锚碇。本文介绍了该桥下部结构施工的一些关键技术环节,包括主缆锚碇锚固系统的安装,大体积混凝土的温控防裂,主塔基础和承台的海上施工,塔柱滑模施工控制等。     

汕头海湾大桥悬索桥加劲梁施工技术

汕头海湾大桥是我国第一座现代悬索桥,主梁结构体系为三跨双铰预应力钢筋混凝土加劲箱梁,在同类型悬索桥中跨度居世界第一。本文介绍加劲梁的施工方法,包括梁段的预制,安装和连接。     

The study of temperature effects on steel box girder for Taizhou Bridge

Using the temperature gradient which was proposed by continuously measuring on flat steel box girder of Runyang Bridge, temperature effects of flat steel box girder was studied for Taizhou Yangtze River Bridge. With three temperature gradient models (JTG D60-2004 specification, BS5400 specification and the temperature gradient which was proposed in this paper), the control sections stress was calculated by finite element program ANSYS. The calculated result indicates that the temperature gradient that was put forward in JTG D60-2004 specification and BS5400 specification for calculating stress of flat steel box girder was not suitable to apply to flat steel box girder. The temperature gradient on flat steel box girder which was proposed in this paper was reasonable.     

Scaled down model design of shaking table test of Taizhou Bridge

Taizhou Bridge is the first kilometer level three-pylon two-span suspension bridge in the world and the structural complexity has significant effects on the seismic performance of the bridge. Shaking table test of Taizhou Bridge is arranged to investigate the effects of non-uniform ground motion input, collision between main and side spans and optimal seismic structural system. It’s very important and difficult to design and manufacture the scaled down model of Taizhou Bridge used during the shaking table test. The key point is that the girder and pylons are very hard to be manufactured if the similarity ratio is strictly followed. Based on the finite element method (FEM) analysis, a simplified scaled down model is designed and the bending stiffness of the girder and pylon are strictly simulated, and the torsion stiffness and axial stiffness are not strictly simulated. The inner forces and displacements of critical sections, points of simplified model and theoretical model are compared by FEM analysis, and it’s found out that the difference between the seismic responses is relatively small. So, the simplified model can be used to conduct the shaking table test by the FEM verification.     

北盘江大桥悬索桥钢桁加劲梁施工技术

北盘江大桥为主跨636 m单跨双铰钢桁加劲梁悬索桥.介绍北盘江大桥钢桁加劲梁拼装、架设施工技术.     

Research on key technologies in design of middle pylon of Taizhou Bridge

At the middle pylon of a three-pylon two-span suspension bridge, the effect of unbalanced loads on the adjacent spans may result in a series of technical bottlenecks in design, such as stability and anti-slippage between saddles and main cables. This article presents the researches conducted on structure selection and behavior characteristics of middle pylon, interaction mechanism between main cables and saddles and their anti-slippage safety performance, elastic and plastic stability analysis and safety assessment of steel middle pylon, and fatigue design load and method for steel pylon of Taizhou Bridge. According to the research results, a longitudinal inverted Y shape steel middle pylon is used in design, effectively solving many technical difficulties, and this type of pylon has become a suitable middle pylon structural form for many three-pylon two-span suspension bridges.     

泰州大桥悬索桥南锚碇基础的变形及超载安全度分析

 锚碇作为悬索桥的主要承力结构物,其变形是影响悬索桥安全的重要因素。针对泰州大桥悬索桥的南锚碇基础,建立了三维的地层-结构模型,应用大型数值软件Flac3D和超载分析法,假定锚碇的超载为大缆拉力按比例增加,研究了锚碇基础的变形随大缆拉力超载系数的变化规律。结果表明,在大缆拉力为设计载荷,即大缆拉力超载系数λ=1时,数值模拟计算结果与现场实测结果接近;在超载情况下,当λ<3.5时,锚碇基础最大变形随大缆拉力超载系数基本呈线性增加;当λ>3.5时,锚碇基础变形随大缆超载系数呈非线性增加;而当λ=3.81时,锚碇基础的水平位移达到极限值。因此,综合考虑锚碇基础的土体塑性区分布和变形控制要求,得到了泰州大桥悬索桥南锚碇基础的超载安全度为3.81的结论,可为泰州大桥工程的稳定性评价提供参考依据。     

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.     

建筑市场监管管理信息系统的设计方法

对建筑市场监管计算机化进行了分析，提出了建模方法，建立了系统技术设计方案，并在此基础上模拟开发了一个较为实用的应用软件。     

自锚式悬索桥线形控制施工技术探索

自锚式悬索桥是一种内部高次超静定结构,理想的几何线形和内力状态不仅和设计有关,而且依赖于科学的施工方法,通过对施工过程的控制和结构内力状态的监测来指导、调整施工顺序和施工工艺以获得设计的应力状态和几何线形。     

康济桥的施工控制

描述了金华康济桥施工控制的张拉过程,研究了自锚式悬索桥施工中的力学特性,发现当加劲梁未被张拉脱离支架时,张拉吊杆对非张拉点主缆的位移影响很小,可以忽略不计,因此在前期张拉吊杆时,可以用位移来控制;提出了交替前进张拉法并将其运用在实际施工中,仅通过3轮张拉吊杆就顺利地实现了体系转换,使主缆的线形、加劲梁的线形、索鞍的顶推量和吊杆力都达到了设计的要求.该方法准确、高效,具有广泛的应用前景.     

大型桥梁施工检测的方法和技巧

以黄河龙口水利枢纽大桥施工为例,介绍了大型桥梁施工的检测方法和检测技巧。