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Effects of seismic devices on transverse responses of piers in the sutong bridge

Earthquake Engineering and Engineering Vibration 2015年第4期14卷 611-623页

作者： Shen Xing Alfredo Camara Ye Aijun State Key Laboratory for Disaster Reduction in Civil Engineering Tongji University Department of Civil and Engineering City UniversityLondonUnited Kingdom PhD

The sutong bridge in China opened to traffic in 2008, and is an arterial connection between the cities of Nantong and Suzhou. It is a cable-stayed bridge with a main span of 1,088 m. Due to a tight construction schedule and lack of suitable seismic devices at the time, fixed supports were installed between the piers and the girder in the transverse direction. As a result, significant transverse seismic forces could occur in the piers and foundations, especially during a return period of a 2500-year earthquake. Therefore, the piers, foundations and fixed bearings had to be designed extraordinarily strong. However, when larger earthquakes occur, the bearings, piers and foundations are still vulnerable. The recent rapid developments in seismic technology and the performance-based design approach offer a better opportunity to optimize the transverse seismic design for the sutong bridge piers. The optimized design can be applied to the sutong bridge(as a retrofit), as well as other bridges. Seismic design alternatives utilizing viscous fluid dampers(VFD), or friction pendulum sliding bearings(FPSB), or transverse yielding metallic dampers(TYMD) are thoroughly studied in this work, and the results are compared with those from the current condition with fixed transverse supports and a hypothetical condition in which only sliding bearings are provided on top of the piers(the girder can move "freely" in the transverse direction during the earthquake, except for frictional forces of the sliding bearings). Parametric analyses were performed to optimize the design of these proposed seismic devices. From the comparison of the peak bridge responses in these configurations, it was found that both VFD and TYMD are very effective in the reduction of transverse seismic forces in piers, while at the same time keeping the relative transverse displacements between piers and the box girder within acceptable limits. However, compared to VFD, TYMD do not interact with the longitudinal disp

关键词： sutong bridge cable-stayed bridge seismic devices transverse response bridge piers viscous fluid dampers(VFD) friction pendulum sliding bearings(FPSB) transverse yielding metallic dampers(TYMD)

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Dynamic Geometry Monitoring System and Its Application in sutong bridge Construction

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Geo-Spatial Information Science 2010年第2期13卷 137-143页

作者： ZHANG Hong YANG Baocen HUANG Shengxiang School of Civil Engineering & Mechanics Huangzhong University of Science and Technology 1037 Luoyu Road Wuhan 430074 China CCCC Second Harbor Engineering Co. Ltd 16 Nanjing Road Wuhan 430014 China School of Geodesy and Geomatics Wuhan University 129 Luoyu Road Wuhan 430079 China

The construction period of large cable-stayed bridges is long, and the structure deformation is complicated. Any error during construction will potentially affect the cantilever alignments and the internal forces. In order to ensure safety during construction and exactly determine the cantilever alignments, dynamic deformation monitoring is needed immediately when the con struction of the superstructure starts. This paper aims at the requirement of deformation monitoring during the sutong bridge construction, and introduces the realization and observing schemes of the GPS and georobot based on remote real-time dynamic geometrical deformation monitoring system, then researches the data processing methods and enumerates some of the application achievements. Long-term operation during the sutong bridge construction indicates that the system runs steadily and the results are reliable.

关键词： dynamic geometry monitoring system sutong bridge GPS construction

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Construction and control technology of the main bridge superstructure of sutong bridge

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Engineering Sciences 2009年第1期7卷 76-82页

作者： Zhang Hong Luo Chenbin Zhang Yongtao You Xinpeng Huazhong University of Science and Technology Wuhan 430074 China CCCC-Second Harbour Engineering Company Limited Wuhan 430014 China

The sutong Yangtze River bridge(short as sutong bridge)is now the largest span cable-stayed bridge in 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 *** big block girders were hoisted by a floating crane,and the standard girders were hoisted by a double crane system on the *** pushing assistant method was adopted for the middle span closure ***,key technologies and innovative methods used in the processes of girder erection and cable assemblage in all stages were expatiated *** all-stage self-adaptive geometry control method was used in the construction *** 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 *** 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 ***,research on the wind-induced vibration of the superstructure during the construction period was *** response analysis to the longest single and double cantilever states were carried *** 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 *** 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.

关键词： sutong bridge superstructure construction method construction control geometry control wind-resistant measure

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Assistant pullback technique for main span closure of sutong bridge

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Engineering Sciences 2009年第1期7卷 69-75页

作者： Chen Ming Luo Chengbin Wu Qihe Zhang Yongtao You Xinpeng CCCC-Second Harbour Engineering Company Limited Wuhan 430014 China Key Lab of Large-span bridge Construction Technology Ministry of Communications Wuhan 430071 China

sutong bridge is a cable-stayed steel box girder bridge with a main span of 1 088 m. The erection of upper structure adopts geometry control method and requires no change to the unit＇ s size and the structure＇ s none-stress geometry. Before main span closure, the cantilever of girder reaches 540.8 m, the structure state is noticeably influenced by extemal circumstances, the main span closure face great difficulty. By abstracting the advantage of the pullback method abroad and the domestic temperature-cutting method, a new assistant pullback method have put forward and bring into practice actually. In this paper, the analysis key point of practice conditions, key parameter of practice, main measures of the method and the performance is introduced.

关键词： sutong bridge assistant pullback main span closure geometric control methord construction technology

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Key technology and innovation of sutong bridge

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Engineering Sciences 2010年第2期8卷 31-38页

作者： Zhang Xiongwen Jiangsu Provincial sutong bridge Construction Commanding Department Nanjing 210006 China

sutong bridge is a cable-stayed bridge across Yangtze River with the main span of 1 088 m. This article outlines technical challenges,key technology and innovation in the design and construction such as scour protection,lowering steel cofferdam,construction platform establishment,construction and control of pylons,fabrication and damping of long cables,erection and control of steel box girders.

关键词： sutong bridge key technology innovation structure system foundation pylon stay cables steel girder

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Research on the special lifting devices for steel box girders of sutong bridge

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Engineering Sciences 2009年第1期7卷 63-68,F0003页

作者： Chen Ming Wu Qihe Luo Chengbin Zhou Hanfa CCCC-Second Harbour Engineering Company Limited Wuhan 430014 China Key Lab of Large-span bridge Construction Technology Ministry of Communications Wuhan 430071 China

sutong bridge is a cable-stayed bridge with a steel box girder and a main span of 1 088 *** steel box girder of main span includes five portions:back span large unit,large block of pylon,standard girder,back span closure girder and middle span closure *** back span large unit is fabricated by welding several deck segments together in factory,and is erected by floating *** navigational clearance of the main bridge is high,the traditional truss lifting device can't satisfy the requirement of domestic lifting cranes for this kind of lifting height and ***,a kind of lighter lifting device for the erection of back span large units was accepted for this *** this paper,the design and use of this lifting device is *** upper structure used lifting gantry to install the standard girder segment by cantilever *** the bridge's navigation clearance is high,and the girder segment is wide and heavy,the meteorology and hydrology condition of the bridge district is abominable,and the requirements of long cable girder side pull-in,structure and performance propose high request to the lifting *** this paper,the design and use key point of long cable pull-in angle adjustment device integrate into lifting gantry is introduced.

关键词： sutong bridge large units lifting devices cantilever installation lifting gantry design and use

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Design and construction of sutong bridge tower

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Engineering Sciences 2009年第1期7卷 45-51页

作者： Luo Chengbin Zhou Jianlin Tian Wei Dai Jie CCCC-Second Harbour Engineering Bureau CCCG Wuhan 430014 China Jiangsu Provincial sutong bridge Construction Commanding Department Nanjing 210006 China Key Lab of bridge ＆Tunnel Technology of CCCG＆WHEDRI Wuhan 430071 China Communications Planning and Design Institute of Jiangsu Province Nanjing 210005 China

sutong bridge tower which is 300.4 m is the highest one in the *** tower anchor area uses the steel-concrete composite structure,its structure and the stress mechanism are complex,so it must be paid more attention to the structure durable *** 300 m height makes the tower quite sensitive to the environmental factors such as wind and *** wind resistance safety of tower in construction stage is especially *** this paper,the design of composite structure is *** key technologies of tower geometry control and wind resistance in construction stage are analyzed.

关键词： sutong bridge tower design construction key technology

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Stress and noises of steel box girders in sutong bridge

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Engineering Sciences 2008年第4期6卷 53-59页

作者： Xue Tao Chen Zhijian Dong Xuewu College of Civil Engineering Hohai UniversityNanfing 210098 China Jiangsu Province sutong bridge Construction Commanding Department Nantong Jiangsu 226009 China

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.

关键词： sutong bridge cable-stayed bridge steel box girder wavelet denoising meteorological factor Layered Separation method

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Design and construction of sutong bridge deep-water main-pylon foundations

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Engineering Sciences 2009年第1期7卷 30-36页

作者： Ren Huixing Ouyang Xiaoyong He Maosheng Nie Qinlong Wang Xiali The 2^nd Highway Engineering Bureau of China Communications Construction Co. Ltd. Xi＇an 710065 China

This paper,from three aspects including construction conditions,foundation design and construction,introduces some considerations in the designing of main-pylon foundations and some practical measures to deal with certain unfavorable construction conditions,such as deep water,tidal effect,soft stratum and heavy traffic,during the construction of main-pylon foundations.

关键词： sutong bridge group-pile foundation design construction platform steel cofferdam scour protection

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Study on complexity of sutong bridge's objectives system and its meta-synthesis management

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Engineering Sciences 2009年第1期7卷 93-100,F0003页

作者： Fa Yueping Li Zhen School of Engineering and Management Nanjing University Nanjing 210093 China Jiangsu Provincial sutong bridge Construction Commanding Department Nanjing 210006 China

Objectives define the boundaries of complex engineering *** is a hard work to identify the specific objectives of a complex engineering *** objectives system development needs a complicated process,from nix to prototype,and to final *** total process will cover the following course:from chaos to well-ordered;from qualitativeness to combination of quantitativeness and qualitativenss,then from qualitativeness to quantitativeness(a recurrent process),expert experience and theoretical science,rationality and sensibility,synthesis analysis and meta-synthesis,routinization and *** process is explicit in phase development yet overlapped;mutually confined yet mutually independent;permeated conflicts yet pregnant in *** article explores the complexity of sutong bridge's objectives development and the process of meta-synthesis in the sutong bridge engineering.

关键词： objectives system complexity meta-synthesis sutong bridge

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