南广铁路桂平郁江双线特大桥主桥桥式方案研究

研究目的：南广铁路桂平郁江双线特大桥为全线重点控制工程，受郁江通航净空和净高控制，如何采用合理的桥式方案，以降低线路标高，减少引桥长度，达到既能满足郁江通航要求、又能节省投资的目的．研究结论：通过对钢桁斜拉桥、连续钢桁拱桥和连续刚构斜拉桥三种桥式方案的研究，推荐采用36＋96＋228＋96＋36m钢桁斜拉桥。     

南京大胜关长江大桥高强度螺栓试验控制方案

介绍京沪高速铁路南京大胜关长江大桥在主桥钢梁架设中高强度螺栓（以下简称高栓）进场检验、工艺试验及施拧过程试验控制的方案。     

张五楼丰沛运河大桥设计

张五楼丰沛运河大桥布置为36＋60＋36m三跨预应力混凝土变截面连续箱梁,采用三向预应力体系,文章以该桥施工图设计为依据对其设计概况、结构特点、预应力体系及施工方案作了简单介绍。     

预应力混凝土梁跨大郑线大桥简支T梁架设施工方案

新建甘旗卡至库伦铁路工程跨大郑线大桥位于内蒙古自治区通辽市科左后旗甘旗卡镇,全桥共有4孔3个桥墩2个桥台,桥式布置为4-32m后张法预应力混凝土梁,全长146.93m,起讫里程为DK1＋896.53（甘旗卡方向台尾）～DK2＋043.46（库伦方向台尾）,桥梁中心里程DK1＋970.00。本文就对大桥简支T梁架设施工方案进行了研究,以提高预应力混凝土梁施工技术水平。     

跨跃四元桥连续钢——混结合梁施工技术总结

钢混结合梁由钢梁和混凝上桥面板组成。将钢梁制作这部分工作量放到工厂内进行,减少了现场的土建工程量,面且架设后的钢梁可作为混凝上桥面板施工平台。减少了搭设支架的工程量,特别适宜在交通要道的上跨立交桥中使用。     

高邮黄渡大桥55mT梁架设施工技术

55m大跨度T梁,设计长、宽比严重超标,横向刚度极小,稳定性差;单片梁达170t,制梁场距桥跨近450m。架桥机自重200多吨,对运、喂、架梁方案进行了论证,对架设实施过程作了介绍,为今后其他该类T梁架设提供借鉴实例。     

南京新鸿基超高层项目两种结构方案的经济性分析

比较了新鸿基CBD项目的两种混合结构方案。该项目写字楼高度约251.9 m,采用框架-核心筒混合结构。部分外框架柱内倾,高区核心筒角部缺失,楼盖可采用钢梁或型钢梁。通过这两种楼盖方案抗的比较得到以下结论:型钢梁在抗震、造价和后期维护方面占优,钢梁在工期上有优势。目前超高层普遍采用混合结构方案,很多分析工作都集中在这两类楼盖梁的比较上。研究对混合结构楼盖的选择有参考价值。     

受荷工字型钢梁腹板开孔监测研究

通过对受荷工字型钢梁腹板开孔试验的实时监测,分析不同工况下钢梁开孔前后的受力特性,监测结果表明:在开孔率较小时气割开孔导致的温度应变远大于开孔引起的受荷应变,并且开孔时在钢梁下架设临时支撑可以有效地降低残余应变.同时,结合有限元模拟,讨论了开孔形状、尺寸对钢梁力学性能的影响,结果表明:孔径在200 mm以内是钢梁开孔的合理选择.有限元模拟与现场试验结果的比较表明了在钢梁开孔现场试验的必要性.     

钢梁拼装架设施工技术探讨

钢梁拼装架设的方法有三种:支架法、拖拉法、悬壁拼装法、浮运法、缆索拼装法、转体架设法。本文对这三种拼接方法进行了总结论述,并就拼装时出现的病害进行了原因分析,提出了防治措施。     

预应力钢管拱混凝土连续梁支架法施工及质量控制

通过对太中银铁路ZQ～VII标DK697＋043．3612—32m＋1-（60＋96＋60）m＋21—32m石中高速公路特大桥1-（60＋96＋60）M连续梁支架法施工中支架设计、支架基础处理、支架预压、钢筋施工、梁模板施工、混凝土施工、钢管拱内混凝土倒注施工以及桥梁预应力施工和连续梁施工中各种施工工艺和注意事项，以及该工程中的具体操作方法的总结，介绍了下承式钢管混凝土铁路连续梁跨越高速公路支架法施工的方法和施工中质量、安全控制的具体要求。     

斜拉桥扁平空腹钢箱梁悬拼施工时的截面变形

湛江海湾大桥主桥是一主跨为480m的双塔空间双索面混合梁斜拉桥,钢主梁采用扁平空腹流线型钢箱梁,标准梁段横隔板和纵隔板均为桁架式.在悬臂拼装施工过程中,吊机作用梁段与被吊梁段受力不同,在两段梁的接口处存在较大的变形差异.文中采用混合单元建立被吊梁段与吊机作用梁段的三维有限元模型,分析了悬臂拼装阶段钢箱梁拼接口的相对变形,研究了纵横隔桁架刚度等参数对变形的影响.分析表明,大跨度斜拉桥采用全空腹钢箱是可行的,相对变形的大小取决于箱梁的整体刚度和吊机的横向着力点.     

Construction and control technology of the main bridge superstructure of Sutong Bridge

The Sutong Yangtze River Bridge （short as Sut.ong Bridge） is now the largest span cable-stayed bridge in the world. The construction of the superstructure of the middle bridge covered several stages including erection of the big block girders for the side span, assistant span and tower area, erection of standard girders and closure of the middle span. The big block girders were hoisted by a floating crane, and the standard girders were hoisted by a double crane system on the deck. The pushing assistant method was adopted for the middle span closure construction. Furthermore, key technologies and innovative methods used in the processes of girder erection and cable assemblage in all stages were expatiated systematically. An all-stage self- adaptive geometry control method was used in the construction process. By accurately controlling the unstressed dimensions and shape of all structural components in each step, and realization that the control system and the controlled system adapt to each other, the goal was to make control of the final line shape and inner force of the bridge structure achievable. Two solutions, including GPS based and total station based dynamic geometry monitoring systems, were used to resolve the measure problem under the wide - range of wind-induced vibrations in the long cantilever state. Finally, research on the wind-induced vibration of the superstructure during the construction period was executed. Buffeting response analysis to the longest single and double cantilever states were carried out. The analysis and evaluation of wind resistance safety of the main girders under the longest single cantilever state was made, and corresponding wind resistance measures were suggested. The as-built geometric error and cable force error were controlled in a required design range, and this whole technological achievement can be a benchmark for construction of other large span cable-stayed bridges in the future.     

新光大桥的动力特性和地震行波效应研究

新光大桥位于广州新光快速路主干线,是世界上第一座三跨连续钢桁拱与钢筋混凝土V型刚构结合的钢-混凝土组合体系桥梁,主桥跨度为177 428 177 m,在目前同类型桥梁中,主桥长度位居世界第一.该桥结构新颖,造型独特.文章主要针对新光大桥的动力特性和地震行波效应进行了详细研究.在两水准、两阶段抗震设防思想下给出了主要控制构件在考虑行波效应情况下的内力,并与纵桥向地震一致激励作用下的内力进行了比较;同时给出了在不同剪切波速下,主拱顶截面的位移时程曲线.研究表明行波效应以及地面剪切波速度对大跨度连续刚架钢桁拱桥的地震响应有着较大的影响.     

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.     

Three-dimensional nonlinear flutter analysis of long-span suspension bridges during erection

In this work, the aerodynamic stability of the Yichang Suspension Bridge over Yangtze River during erection was determined by three-dimensional nonlinear flutter analysis, in which the nonlinearities of structural dynamic characteristics and aeroelastic forces caused by large deformation are fully considered. An interesting result obtained was that the bridge was more stable when the stiffening girders were erected in a non-symmetrical manner as opposed to the traditional symmetrical erection schedule. It was also found that the severe decrease in the aerodynamic stability was due to the nonlinear effects. Therefore, the nonlinear factors should be considered accurately in aerodynamic stability analysis of long-span suspension bridges during erection.     

Research on the stiffening girder erection sequence of three tower suspension bridge

Compared to the conventional two-tower suspension bridge, the three-tower suspension bridge has obviously different characteristics in structural performance because of the extra middle tower and main span. The construction sequence for the stiffening girder is significantly different between the three-tower suspension bridge and the two-tower suspension bridge. The tangential angle of the main cable is one of the controlling factors of the stiffening girder erection stage for a suspension bridge. According to 5 feasible cases for the stiffening girder erection scheme in Taizhou Bridge, the research about the tangential angle in each case mentioned above was made, and some factors that should be taken into account for the erection scheme of stiffening girder were pointed out.     

浦上大桥斜拉桥设计

福州浦上大桥通航孔主桥为(72+2×110+72)m三塔单索斜拉桥,本文着重介绍了斜拉桥设计。     

低矮型钢-混凝土组合梁桥方案设计与分析

以36m跨径的简支梁桥改造设计为例,分析比较了普通组合平行工字梁、预应力组合平行工字梁和组合箱梁三种桥型在相同荷载等级作用下的受力、变形以及经济性能.结果表明,组合梁桥具有较好的性能,预应力组合梁和组合箱梁的经济高跨比可以小于1/20.     

多点激励下大跨度连续刚架拱组合桥的空间地震响应分析

新光大桥位于广州新光快速路主干线,是世界上第一座三跨连续钢桁拱与钢筋混凝土V型刚构结合的钢-混凝土组合体系桥梁,主桥跨度为177 m 428 m 177 m,在目前同类型桥梁中,主桥长度位居世界第一. 该桥结构新颖、造型独特. 本文以广州新光大桥为例,详细分析了大跨度连续刚架-拱组合结构桥梁在纵桥向和横桥向地震一致激励和多点激励作用下的地震响应. 研究表明多点激励对主拱肋上、下弦杆以及V型刚架斜腿地震内力响应均有较大影响,而对边拱肋轴力影响很小,并且纵桥向多点激励要比横桥向多点激励对结构的影响要明显.     

Stress and noises box girders in sutong bridge

Sutong Bridge is a cable-stayed bridge with a main span of 1 088 m. 370 high-precision stress monitoring measured data show that in the process of hoisting the steel box girders, the stress of the main girders is in the fluctuant and complex state and many meteorological factors, such as sunshine radiation, temperature and wind, have important influence on the change of stress of the steel box girders. According to the real-time weather data, the stress data after the process of wavelet denoising from representative measuring points in different weather conditions is picked to establish the stress response brought by meteorological factors with Layered Separation method, thereby basically eliminating the influence of meteorological factors on the stress of main girders, so that accurate and reliable stress data can be got for steel box girders adjustment and cable-tensioned construction control.