Calculation of Cable Force for Long-Span Rib Arch Bridge Construction under Seasonal Ambient Temperature

2011 ◽  
Vol 378-379 ◽  
pp. 341-344
Author(s):  
Wei Feng Tian ◽  
Shui Xing Zhou ◽  
Ayad Thabet Saeed Alghabsha
Keyword(s):  
Ambient Temperature ◽  
Control Method ◽  
Difficult Problem ◽  
State Control ◽  
Optimization Analysis ◽  
Arch Bridge ◽  
Long Span ◽  
Unstressed State ◽  
Cable Force ◽  
Cable Forces

Calculation of cable force under seasonal ambient temperature is the key and difficult problem in the construction of long-span rib arch bridge. It affects the final cable forces and deformations of arch rib after arch closure. Unstressed state control method is introduced in the construction of Daning River Bridge; unstressed qualities of ribs and unstressed length of cables can be obtained by optimization analysis of the maximum cantilever state in construction. According to unstressed state control method, the cable forces of each segment were calculated using the forward-iteration method. These results offer the basis for construction control, and guarantee the arch rib line and cable forces to meet the design requirements, and an arch closure with high precision.

An Incremental Method for Cable Force Tuning of the Concrete Cable-Stayed Bridge Considering Cable-Girder Temperature Difference Effect

2013 ◽  
Vol 477-478 ◽  
pp. 690-696
Author(s):  
Niu Jing Ma
Keyword(s):  
Ambient Temperature ◽  
Temperature Difference ◽  
Mechanical State ◽  
Frequency Method ◽  
Incremental Method ◽  
Cable Stayed Bridge ◽  
Cable Force ◽  
Cable Forces ◽  
Difference Effect ◽  
Control Quantity

To ensure that the cable force tuning of Banfu No.2 bridge was carried out successfully, an incremental method for cable force tuning was presented, which took into account the cable-girder temperature difference. The cable forces were measured through frequency method. Before cable force tuning, all cable forces and temperatures of cables and girders were measured when the ambient temperature was stable, and these cable forces were taken as reference cable forces. During cable force tuning, the increment of cable force was regarded as the control quantity, while the displacement in the middle of main span was regarded as the verification quantity. After each stage, it was necessary to measure the temperatures of cables and girders and the displacement variation in the middle of the main span. To ensure the mechanical state of bridge was in control, all cable forces were measured after the 5th, 10th pairs of cables and all cables were tuned. In addition, the temperature-corrected cable forces were compared with the calculated ones, which showed the incremental method was not only accurate but also efficient.

Control Method on Main Girder Configuration of Self-Anchored Suspension Bridges Based on Long Segment Hoisting Method

2011 ◽  
Vol 243-249 ◽  
pp. 1540-1548
Author(s):  
Yu Zhao ◽  
Jia Le Wei ◽  
Shuan Hai He
Keyword(s):  
Control Method ◽  
Suspension Bridge ◽  
Internal Force ◽  
Suspension Bridges ◽  
Construction Technique ◽  
Method Of Calculation ◽  
Main Cable ◽  
Unstressed State ◽  
Cable Force ◽  
And Control

Based on the object of self-anchored suspension bridge constructed with long segment hoist method, the load-carrying characteristics and construction technique which is different from other self-anchored suspension bridge is analyzed, and the method of calculation and control on steel box girder configuration during the construction course of long segment hoisted are proposed. For different calculation methods of girder configuration lifting, the influences of the three manners of pre-cambering for steel girders on the configuration and internal force of finished bridge are analyzed. The results show that inverse erection— forward erection—unstressed state synthetic method can guarantee the minimum deviation of steel girder configuration of finished bridge with the design, and it is not necessary to adjust the suspension cable force, and there is no change in main cable configuration and internal force.

Research on Construction Control of Long-Span CFST Arch Bridge

2015 ◽  
Vol 777 ◽  
pp. 88-93
Author(s):  
Ying Gu ◽  
Ya Dong Li ◽  
Sai Zhi Liu
Keyword(s):  
Calculation Method ◽  
Line Shape ◽  
Shape Control ◽  
Steel Tube ◽  
Construction Control ◽  
System Transformation ◽  
Arch Bridge ◽  
Long Span ◽  
Cable Forces ◽  
Control Principle

For an arch rib of concrete filled steel tube (CFST) erected by cable-stayed cantilever method, the construction control becomes increasingly difficult along with the erection of rib segments, owing to more system transformation, and higher degrees of static indeterminacy. First, for the problems usually occurred in the process of ribs erection, this paper presented a line-shape control principle that is “erecting higher, remaining stationary”. Secondly, based on analysis of the merits and demerits of common methods for cable forces calculation, and according to the principle of “remaining stationary”, a new calculation method for cable forces was proposed. At last, based on an X-style CFST railway arch bridge with a span of 360m, this paper compared the cable forces calculated by the new method with the actual tensioned forces, analyzed the variation of segments displacement in the process of erection, and discussed the influence of prearranged height on weld width. The control principle and the calculation method for cable forces presented in this paper have been proved effective, by the line-shape data measured after the closure of arch ribs, which may provide valuable reference for the construction control of similar CFST arch bridges.

scholarly journals Suspender Replacement Method for Long-Span Concrete-Filled Steel Tubular Arch Bridges and Cable Force Measurement Based on Frequency Method

2021 ◽  
Vol 2021 ◽  
pp. 1-21
Author(s):  
Yulin Deng ◽  
Luming Deng
Keyword(s):  
Force Measurement ◽  
Estimation Method ◽  
Traffic Load ◽  
Frequency Method ◽  
Arch Bridge ◽  
Calculated Length ◽  
Long Span ◽  
Replacement Method ◽  
Cable Force ◽  
Cable Force Measurement

The suspenders on the sides of an arch bridge are highly vulnerable to damage caused by traffic load and environmental corrosion. To accurately estimate the cable force of suspenders, herein, we analyse the influencing factors through a suspender tension test based on the principle of suspender vibration. The frequency of each suspender of the bridge is evaluated using the frequency method. By combining the cable force data measured directly and the measured suspender frequency, the formulas for calculating the cable forces of long and short suspenders are fitted, and a reasonable estimation method for the calculated length of short suspenders is provided. The formulas are verified through application to a CFST arch bridge. Results indicate that the proposed formula effectively considers the influence of the sleeve on the overall calculated length of the suspender. The formula calculates the suspender cable force with higher accuracy, proving its suitability for engineering use.

Analyze on Construction Status Long-Span Arch Rib Bridge by Numerical Simulation

2011 ◽  
Vol 480-481 ◽  
pp. 1318-1323
Author(s):  
Jiang Hao
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Construction Method ◽  
Bridge Construction ◽  
Actual Measurement ◽  
Arch Bridge ◽  
Long Span ◽  
Cable Force ◽  
Element Method

Non-cable hoisting frame is a construction method of the main arch ribs of big span bridge. The key issue in the numerical simulation of this type of bridge construction is geometric nonlinearity approach. Construction method of long-span bridge rib and stage-by-stage construction method of a arch bridge was simulated by finite element method. The geometric description was attained comparison with simulation results and the actual measurement of cable force. The results show that finite element method is effectively used in the simulation of long span arch bridge construction.

Sign in / Sign up

Export Citation Format

Share Document