装配式桥梁钢混组合梁施工技术分析与探究

组合梁是一种较为稳固的结构形式,在装配式桥梁施工中作用十分显著,由钢梁和桥面板(混凝土)搭接而成,共同形成受力组合结构.另外,钢材抗拉能力强,可以满足各项施工要求,在大型工程中应用较广.论文结合某钢混桥梁项目的具体施工方案,重点分析组合梁施工的关键技术,全面掌握连接方式以及施工组合顺序等核心内容,以便取得理想效果,为今...     

装配式城市高架桥预制桥墩、桥梁的运输方法

上海嘉闵高架路(G2—S6)JMB2-4标段采用预制装配式工艺施工,为解决大型预制桥墩、桥梁从工厂至施工现场的运输问题,针对预制立柱与预制盖梁的结构特点,分别进行研究,从而形成了一种安全可靠的运输方法,为装配式桥梁预制桥墩、桥梁的运输提供了经验参考。     

预制装配式桥梁在城市公路中的应用

文中以国道312改扩建工程为背景,介绍了预制装配式桥梁在城市公路中的应用。本项目桥梁不仅上部结构采用预制装配的预应力混凝土小箱梁、钢箱梁和钢混组合梁,下部结构也采用了预制装配式技术,盖梁、墩柱在工厂分段预制,在现场通过吊装拼接形成整体。预制装配式技术的应用为繁忙路段的城市公路桥梁设计与施工提供了新的思路。     

预制装配式桥梁在城市道路中的应用

城市道路作为我国交通运输核心构成,其建设水平高低直接决定整个城市经济发展,预制装配式桥梁凭借自身多方面优势,广泛用于城市道路中,获取较佳的应用效果。预制装配式桥梁建设周期长、技术要点较多,应结合现场实际状况,掌握其施工相关技术要点,选取科学、合理的策略和方法,做好各施工环节质量,以确保预制装配式桥梁施工达标,促进城市道路高质量发展。     

既有通行道路上建造高架桥装配式盖梁支架施工工艺研究

莱高架项目采用一级公路兼具城市道路功能的标准进行建设,为国道老路改扩建项目.在现状地面道路中间新建高架桥梁,高架线型沿既有道路中央分隔带布设,施工期间围挡宽度16m,围挡外两侧进行社会车辆保通,传统满堂支架施工工艺无法满足保通要求.结合项目实际施工环境和条件,基于边通车边施工的交通组织,盖梁选用悬臂支架和门洞式支架现浇施工.该文主要从现浇支架装配化施工的原理、设计及施工方面进行阐述,以实际施工应用说明其在此类作业条件下的先进性和实用性,可为类似工程提供参考.     

压型钢板在桥梁中的首次应用

结合现场实际操作,以压型钢板钢箱梁施工中的首次应用为例,简要介绍压型钢板施工方法、安全措施和施工中应注意的现象.     

装配式桥梁桥墩预制工厂流水线的设计

为满足上海嘉闵高架路(G2—S6)新建工程JMB2-4标段桥梁预制拼装的需要,建立了装配式桥梁桥墩预制工厂。通过对预制构件生产流水线进行合理设计,大幅提高了生产效率和管理水平,实现了预制构件工厂内制作、现场安装的高效施工,对于高架桥梁的工业化生产有一定的现实意义和推广价值。     

城市高架中小跨径钢板组合梁安装技术研究

在城市高架中小跨径组合结构桥梁中,钢板组合梁桥(工字钢主梁+混凝土桥面板的组合结构)由于构造简单、制作与施工方便、强度高、施工速度快、后期养护简单的优点在国外被广泛采用,目前是美国、欧洲及日本组合结构桥梁的主力桥型,但国内施工的钢板组合梁桥数量甚少.鉴于以上诸多优点,近年来我国在大力推广钢结构桥梁.本文结合台州市路泽太...     

Behaviour of embedded steel plate in composite coupling beams

Plate-reinforced composite (PRC) coupling beam is fabricated by embedding a vertical steel plate into a conventional-reinforced concrete coupling beam to enhance its strength and ductility. Shear studs are welded on the steel plate surfaces to allow for proper load transfer between the concrete and steel plate. The present study focuses on the evaluation of internal load distributions and load sharing on the embedded steel plate as well as at the shear studs in composite coupling beams using the nonlinear finite element package ATENA. The proposed two-dimensional finite element model is able to simulate the overall load-deflection behaviour and internal load distributions of coupling beams subjected to bending and shear forces. The reliability of the model is demonstrated by comparisons with the available experimental results. This is followed by an extensive and carefully planned parametric study using the calibrated finite element model. Numerical results on the effects of steel plate geometry, span-depth ratio of beams and steel reinforcement ratios at beam spans and in wall regions are presented and discussed in this paper. The finite element model provides a better understanding of the behaviour of shear studs as well as plate anchorage in the wall regions and embedded beam region. Based on the numerical results, equations for quantifying the shear stud forces are established and a set of non-dimensional design charts for determining the internal forces of the embedded steel plates is constructed. Both of them are useful for engineers to design PRC coupling beams.     

Stiffness analysis of concrete filled steel plate composite coupling beams

联肢剪力墙弹性阶段的内力分布、抗侧刚度等工作性能主要受墙肢与连梁刚度的影响。为了准确分析外包钢板-混凝土联肢组合剪力墙的受力性能,对外包钢板-混凝土组合连梁的刚度进行了分析。基于钢板与混凝土无相对变形和忽略混凝土抗拉强度的基本假定,建立了组合连梁钢与混凝土无滑移的截面内力与变形之间的关系,并推导了截面刚度的计算公式。对于常用工程设计参数范围内的组合连梁,考虑滑移后得到的抗侧刚度相比无滑移情况减小了10%~24%。通过对无滑移组合连梁刚度公式中的混凝土部分贡献的折减(折减系数为0.5),得到了无特殊界面构造的外包钢板 混凝土组合连梁的刚度计算公式。通过与有限元分析和试验结果的对比,验证了公式的准确性。     

灌注法粘贴钢板在板型桥梁加固中的应用

结合灌注法粘贴钢板在板型桥梁加固中的应用,论述了粘贴钢板加固的优点,介绍了粘贴钢板施工工艺流程,分析了灌注法粘贴钢板的重点和难点,指出灌注法粘贴钢板在板梁加固工程中将得到广泛的应用.     

粘贴钢板技术在桥梁加固中的应用

介绍了粘贴钢板法在桥梁加固中的设计方案,并对其钢板加固、桥面补强加固、裂缝修补等方面的施工要点进行了阐述,分析了施工中应注意的一些问题,总结了该技术的应用优点,从而推广粘贴钢板技术的应用。     

桥梁景观设计在城市桥梁设计中的应用

介绍了城市桥梁景观的作用,阐述了桥梁景观外延与本体设计理论,并结合工程实例,探讨了桥梁景观设计理论在城市桥梁设计中的应用,使桥梁的设计能够反映城市的地域特色与人文风貌。     

粘贴钢板法在旧桥加固中的应用

介绍了粘贴钢板法加固桥梁的原理,并以旧桥加固中的应用为例,阐述了粘贴钢板法的加固设计方法,并对粘贴钢板法的加固施工技术进行了详细论述,以供类似工程参考。     

Reliability of composite steel bridge beams designed following AASHTO''s LFD and LRFD specifications

Composite steel beam bridges designed following AASHTO's Load Factor Design (LFD) method and the newly developed Load and Resistance Factor Design method (LRFD) are proportioned for different loading conditions. They need to satisfy these conditions at maximum design load, an overloading condition, and fatigue load. The ultimate strength of compact composite steel beams is based on the fully plastic stress distribution. The capacity of non-compact beams is based on the yield or partially-plastic moment, depending on whether the beam violates all or few of the compactness or ductility requirements. In this paper, the reliability for the ultimate flexural capacity limit state of composite steel beams is investigated. The structural reliability is measured in terms of the reliability index. The statistical data on strength are generated starting from statistics on material properties and using the Monte Carlo simulation method. Statistical data on load components are compiled from the available literature. The scope of the study covers a wide range of rolled beams, span lengths, beam spacings, and two yield strengths. The deterministic study showed that the design of composite steel beams is usually not governed by the maximum design load combination, but rather by the overloading condition. The results of the reliability study indicate non-uniformity in the safety of steel bridges that are designed by the AASHTO LFD code. This is also true for AASHTO's LRFD code since it is not calibrated for the overloading condition. The value of the reliability index is a function of the compactness classification, method of design, beam spacing, span length, and section size.     

浅议钢结构桥梁在我国的应用

概括了钢结构桥梁的优点及适用范围,综述了钢结构桥梁在我国的主要应用,并针对钢结构桥梁的腐蚀问题作了探讨,最后指出钢结构桥梁具有更广阔的应用空间。     

基于ANSYS软件对钢板梁桥的结构优化分析

以坦桑尼亚铁路桥为例,采用ANSYS有限元软件,从自重载荷、横向风载、交变载荷方面,对钢板梁桥的主梁进行了仿真分析,结合桥梁在三种载荷作用下的应变、应力情况,制定了针对性的加固措施,有利于桥梁结构的优化处理。     

超声技术在钢桥检测中的应用

结合超声检测技术的发展简史和特点,介绍了超声检测技术在钢桥主梁焊缝检测的应用要点,已建钢桥在安全评定中对超声技术的应用,以及超声衍射技术在钢桥检测中的应用及发展,供钢桥检测的施工人员和研究人员参考。