PC Cable-stayed Bridge Research Articles

Analysis of Bridge Health Detection Based on Data Fusion

By integrating rough set theory and neural network theory, this study combined their advantages. Drawing on the existing theoretical results for bridge influencing factors, a method for numerical simulation and data fusion was used in the application of multifactor data fusion for cable‐stayed bridge safety evaluation. Based on studying existing bridge safety evaluation methods, a neural network and rough set theory were combined to perform a safety evaluation of PC cable‐stayed bridge cables, which provided a new means for bridge safety evaluation. First, a cable‐stayed bridge in Shenyang was used as the engineering background, the safety level of its cables was divided into five levels, and a safety evaluation database was established, clustered by a Kohonen neural network. This provided specific evaluation indicators corresponding to the five safety levels. A rough neural network algorithm integrating the rough set and neural network was applied to data fusion of the database, with the attribute‐reduction function of the rough set used to reduce the input dimension of the neural network. Conclusions. The neural network was then trained and the resulting trained network was applied to the safety evaluation of the cables of the cable‐stayed bridge. Four specific attribute index values, corresponding to the bridge cables, were directly input to obtain the safety status of the bridge and provide corresponding management suggestions.

Applicability study of distributed optical fiber sensors for long-term monitoring of long-span PC cable-stayed bridge

Applicability study of distributed optical fiber sensors for long-term monitoring of long-span PC cable-stayed bridge

Analysis of Thermal Effect on Girder with Side Main Rib Section

According to the common girder with side main rib section of PC cable-stayed bridge with double cable planes, a computational model of two-dimension temperature field is presented. Temperature gradient of main rib, small longitudinal rib, top plate and flange plate was computed respectively, and then the stress and strain of each section are derived through plane cross-section assumption. For the cable-stayed bridge, member structure FEM is applied to compute node equivalent load and displacement, which resulted from both sunshine and seasonal thermal difference. Finally, a case study is analyzed, the results showed: computed and measured deflection of girder that result from thermal effect are very close, therefore, this method is feasible.

Post-rehabilitation Cable Force Adjustment of the Tension Rocker Bearing in a PC Cable-stayed Bridge

AbstractTaking the maintenance of a PC cable-stayed bridge as the background, a simulation and calculation analysis of construction control was conducted, and the scheme of stay cable force adjustment was optimized using GQJS (Software of Analysis and Designing of Highway Bridges). Bonding of the steel plates and strengthening by external tendons were achieved, and some construction control targets and safety measures for stay cable force adjustment were provided after the rehabilitation of the tension rocker bearing cables. Adjustment steps and methods were also introduced. The corresponding calculations for the service stage of this bridge were presented. Construction monitoring results showed good force distribution of all stay cables; moreover, the alignment of its main girder was improved after stay cable force adjustment. Concrete stresses, displacement at the top of pylons, and forces of tension rocker bearing cables were also considered. The desired structural goals were achieved in the constructi...

Cluster Health Monitoring System of Major Urban Bridges Based on Digital City VPN Network

With the development of bridge Structural Health Monitoring (SHM) technique and digital city concept in recent years, the Cluster Health Monitoring (CHM) system for urban bridges, simultaneously real-time monitoring many important bridges in the city has been come into engineering practice. This paper introduces a CHM system of urban bridges using Digital City VPN Network at the city of Hangzhou, China, which is composed of three parts: remote monitoring center, digital city VPN network, and bridge monitoring stations, seven bridges of different types (1 viaduct, 1 overpass, 3 tied arch bridges, 1 PC cable-stayed bridge, and 1 continuous beam bridge) are being monitored. One-year monitoring data have been collected through this CHM system, it indicates that using VPN (Virtual Private Network) technology to achieve online urban bridges cluster monitoring is a safe, reliable and practical methods.

The Clever Use of Neutron-Axis of the Girder in the Stress Measurement of the Large Span PC Cable Stayed Bridge

As the stress measurement of interior concrete is hard in the construction control of the cable- stayed bridge, a new method fitted for stress measurement in large span PC concrete cable-stayed bridge is proposed in this paper. This method is based on the principle that the normal stress in neutron-axis of girder is only decided by the horizontal part of the cable force. First, the normal stress on the neutron-axis of girder is calculated by the measured cable force, and then the creep coefficient is identified, and finally the other stresses are worked out. This method has been applied to a large span PC cable-stayed bridge constructed in process with favourable results and thus proves its accuracy and efficiency.

MECHANISM OF SEISMIC RESPONSE OF A PC CABLE-STAYED BRIDGE SUBJECTED TO A LONG-PERIOD SEISMIC EXCITATION

In this study, the mechanisms associated with the seismic response of a long-period structure when subjected to a long-period seismic excitation are clarified. A typical scale cable-stayed bridge with prestressed concrete girders (PC cable-stayed bridge) was selected for analysis. First, we simulated long-period components of the ground motion at the site of the Ji-Lu Bridge, which was damaged in the 1999 Chi-Chi, Taiwan earthquake, and the damage of the bridge was assessed by nonlinear seismic analysis using the simulated ground excitations. Second, shaking table tests of a model PC cable-stayed bridge were carried out, in consideration of the similarity law, to clarify the mechanisms involved, focusing on the linear and nonlinear seismic responses of the tower and cables.

Construction and load test of Nagisa Bridge - Hybrid construction of PC cable-stayed bridge and steel suspension bridge

Construction and load test of Nagisa Bridge - Hybrid construction of PC cable-stayed bridge and steel suspension bridge

VIBRATION CHARACTERISTICS AND DYNAMIC INCREMENT FACTOR OF 2 SPAN CONTINUOUS PC CABLE-STAYED BRIDGE UNDER MOVING VEHICLES

VIBRATION CHARACTERISTICS AND DYNAMIC INCREMENT FACTOR OF 2 SPAN CONTINUOUS PC CABLE-STAYED BRIDGE UNDER MOVING VEHICLES

Effects of soil — structure interaction on seismic response of PC cable-stayed bridge : J. Zheng & T. Takeda, Soil Dynamics & Earthquake Engineering, 14(6), 1995, pp 427–437

Effects of soil — structure interaction on seismic response of PC cable-stayed bridge : J. Zheng & T. Takeda, Soil Dynamics & Earthquake Engineering, 14(6), 1995, pp 427–437

厳寒地におけるPC斜張橋の片持ち張出し施工

厳寒地におけるPC斜張橋の片持ち張出し施工

Effects of soil-structure interaction on seismic response of PC cable-stayed bridge

This paper attempts to assess the effects of dynamic soil-structure interaction (SSI) on the seismic behavior of a PC cable-stayed bridge placed on a moderately deep soil stratum overlying rigid bedrock, and to evaluate the applicability of a simple mass-spring model in evaluating SSI. Parametric analysis is performed to investigate the significance of SSI under various stiffness, foundation depth conditions using finite element methods. The applicability of a mass-spring model is discussed by comparison with FEM. The results of analysis reveal the influence of SSI on the seismic behavior of bridge-soil system, and recommendations for aseismic design are provided. The mass-spring model proves to be promising for representing the seismic behavior of the bridge-soil system, and the mechanism is interpreted in detail.

Aerodynamic force characteristics of PC cable-stayed bridge girders

Aerodynamic force characteristics of PC cable-stayed bridge girders

PC斜張橋ケーブルの風による振動とその対策

斜張橋の長径間化に伴うケーブルの長大化やポリエチレン管被覆ケーブルの一般化およびダブルケーブル方式の増加とともに, 鋼斜張橋のみならず最近ではPC斜張橋においてもレインバイブレーションやウェイクギャロッピングと呼ばれる風によるケーブル自身の振動が大きな問題として取り上げられている。そこで, 本稿では, 斜張橋ケーブルの風による振動について概説したのち, 主にPC斜張橋におけるケーブル制振対策事例について紹介する。また, PC斜張橋ケーブルの制振に関する残された課題と今後の展望についても報告する。

PC斜張橋の施工

PC斜張橋の施工