Analysis on Shearing Deformation of Sectional Joints Affecting Deflection of Cantilever Constructed Box Girder

2010 ◽  
Vol 163-167 ◽  
pp. 1364-1368
Author(s):  
Rong Xia Wang ◽  
Hong Jiang Li ◽  
Ke Xi Jin
Keyword(s):  
Three Dimensional ◽  
Simulation Method ◽  
Beam Deflection ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Shearing Deformation ◽  
Three Dimensional Models ◽  
Cantilever Construction ◽  
Rigid Frame Bridge

Over-deflection of beam in continuous rigid frame bridge has become an serious problem in recent years. The reason is complex. Some reseachers think that the bad quality of sectional joints in cantilever construction will cause additional shearing deformation and affect the beam deflection, this idea need to be further studied. In the paper, two three-dimensional models are built up based on a factual bridge, the simulation method of joints is studied, the influence of shearing deformation caused by sectional joints on beam deflection in construction is analysed. The study shows that shearing deformation of sectional joints has influence on deflection in cantilever construction, and it shouldn’t be ignored. This may be important to improve the loading property and renovate the design concept of this kind of bridge.

The Influence of Concrete Creep on Deflection of Box Beam with Sectional Joints in Continuous Rigid Frame Bridge

2012 ◽  
Vol 446-449 ◽  
pp. 1063-1066
Author(s):  
Rong Xia Wang ◽  
Fan Li ◽  
Rong Guo ◽  
Shao Wei Zhao
Keyword(s):  
Three Dimensional ◽  
Effective Elastic Modulus ◽  
Simulation Method ◽  
Beam Deflection ◽  
Concrete Creep ◽  
Continuous Rigid Frame Bridge ◽  
Box Beam ◽  
Rigid Frame ◽  
Shearing Deformation ◽  
Rigid Frame Bridge

Over-deflection of beam in continuous rigid frame bridge has become an serious problem in recent years. The reason is complex. Some reseachers think that the bad quality of sectional joints in cantilever construction will cause additional shearing deformation and affect the beam deflection, this idea need to be further studied. In the paper, two three-dimensional models are built up based on a factual bridge, the simulation method of sectinoal joints is studied. The influence of concrete creep on the deflection of box beam with sectional joints is analysed being compared to beam without sectional joints . In order to simulate concrete creep, a method of effective elastic modulus adjusted with concrete age was applied. The study shows that the shearing deformation of sectional joints has obvious influence on the long-term deflection , and different calcultion method of concrete creep has different effect on it. It shouldn’t be ignored in the bridge design.

scholarly journals Time-varying Reliability Analysis of Long-span Continuous Rigid Frame bridge under Cantilever Construction Stage based on the Monitored Strain Data

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Ying hua Li ◽  
Ke sheng Peng ◽  
Lu rong Cai ◽  
Jun yong He
Keyword(s):  
Prestressed Concrete ◽  
Base Plate ◽  
Internal Force ◽  
Time Varying ◽  
Construction Stage ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Strain Data ◽  
Cantilever Construction ◽  
Rigid Frame Bridge

Abstract: In general, the material properties, loads, resistance of the prestressed concrete continuous rigid frame bridge in different construction stages are time-varying. So, it is essential to monitor the internal force state when the bridge is in construction. Among them, how to assess the safety is one of the challenges. As the continuous monitoring over a long-term period can increase the reliability of the assessment, so, based on a large number of monitored strain data collected from the structural health monitoring system (SHMS) during construction, a calculation method of the punctiform time-varying reliability is proposed in this paper to evaluate the stress state of this type bridge in cantilever construction stage by using the basic reliability theory. At the same time, the optimal stress distribution function in the bridge mid-span base plate is determined when the bridge is closed. This method can provide basis and direction for the internal force control of this type bridge in construction process. So, it can reduce the bridge safety and quality accidents in construction stages.

scholarly journals Study on construction control system of continuous rigid frame bridge with corrugated steel webs

2021 ◽  
Vol 272 ◽  
pp. 02027
Author(s):  
Z. Y. Lu ◽  
X K Cao ◽  
J D Zhang
Keyword(s):  
Control System ◽  
Real Time ◽  
Three Dimensional ◽  
Construction Control ◽  
Bridge Construction ◽  
The Real ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Rigid Frame Bridge ◽  
And Control

In order to improve the management and control level of bridge construction and understand the real-time dynamics of bridge construction in real time, a set of cloud 3D visualization information management and control system is created based on the Internet platform. In view of the characteristics of high precision and great difficulty in the construction control of corrugated steel webs bridge, a set of construction control and control software based on B/S (browser/server) architecture is developed to help managers know the site structure state more intuitionistic and improve the efficiency of construction control and control. The system deeply integrates the two-dimensional plane information with the three-dimensional entity, and realizes the three-dimensional display of information flow by highly restoring the real bridge construction state in the three-dimensional scene. The results show that the system can assist the management personnel to carry out construction management and improve the engineering efficiency through linear prediction. The system can realize the dynamic demonstration of the long span CSW-PC continuous rigid frame bridge 3D model and the graphical display of the construction measurement and control data and progress information.

scholarly journals Analysis on the Influence Factors of Construction Linear Control of Continuous Rigid Structure Bridge

2021 ◽  
Vol 237 ◽  
pp. 03020
Author(s):  
Yang Liu ◽  
Chunmo Zheng ◽  
Huaiqiang Ba ◽  
Guangli Xu ◽  
Chao Li ◽  
...  
Keyword(s):  
Finite Element ◽  
Influence Factors ◽  
Linear Control ◽  
Prestress Loss ◽  
Cantilever Deflection ◽  
Finite Element Software ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Cantilever Construction ◽  
Rigid Frame Bridge

In order to study the influence of prestress on cantilever deflection and construction linear control of continuous rigid frame bridge in construction stage, this paper introduces the significance of continuous rigid frame bridge’s linear control, the calculation principle and deflection influence analysis of vertical formwork elevation in cantilever construction. According to a specific continuous rigid frame bridge, this paper use the finite element software to simulate and calculate the deflection of prestress to the cantilever construction of continuous rigid frame bridge. The influence of friction coefficient between prestressed steel bundle and bellows and prestress loss on cantilever deflection and construction line control of continuous rigid frame bridge is also analyzed, furtherly brings out the solution to deal with the problems due to the change of prestress.

Analysis on Construction Control of Continuous Rigid Frame Bridge in Winter Intermission

2013 ◽  
Vol 791-793 ◽  
pp. 354-357
Author(s):  
Ya Xun Yang ◽  
Zhi Kui Yang ◽  
Chao Qiao
Keyword(s):  
Construction Control ◽  
Construction Stage ◽  
Construction Period ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Cantilever Construction ◽  
Rigid Frame Bridge ◽  
And Control ◽  
The Impact ◽  
Line Type

Cantilever construction has been commonly used in construction of continuous rigid frame bridge and construction control plays an important role in ensuring the line-type and the forced state. Because of long construction period, it tends to construct across the winter possibly. Considering that the impact of winter intermission on construction control of pre-camber is a problem which the constructors and control staff must pay attention to, this paper takes the impact of winter intermission on construction stage into consideration. The research has guiding significance for the construction of the similar bridge to a certain degree.

Transverse Analysis about Curved Continuous Rigid Frame Bridge Cantilever Concreting Construction Process

2013 ◽  
Vol 361-363 ◽  
pp. 1380-1383
Author(s):  
Ning Zhao ◽  
Bing Zhu ◽  
Wen Jia Suo ◽  
Liang Du ◽  
Fan Wang
Keyword(s):  
Variable Cross Section ◽  
Variable Cross ◽  
Construction Process ◽  
Lateral Deformation ◽  
System Transformation ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Cantilever Construction ◽  
Rigid Frame Bridge ◽  
Calculation Software

Combining with specific engineering example, we used the finite element calculation software and analyzed the lateral deformation and stress of variable cross-section curved continuous rigid frame bridge during cantilever construction. Their some change rules are obtained. They accumulate during cantilever construction, and system transformation influences them greatly. We also put forward some understanding and advice about design and construction.

Seismic Research of Continuous Rigid Frame Bridge under Cantilever Construction Method

2011 ◽  
Vol 368-373 ◽  
pp. 673-677 ◽  
Author(s):  
Xian Yuan Tang ◽  
Qiang Hu ◽  
Yong He Yu
Keyword(s):  
Response Spectrum ◽  
Time History ◽  
Highway Bridges ◽  
Element Model ◽  
Construction Method ◽  
Response Analysis ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Cantilever Construction ◽  
Rigid Frame Bridge

To research the effect of earthquakes of different magnitudes on continuous rigid frame bridge under cantilever construction method, combined with the newly promulgated seismic design rules of highway bridges in China, finite element model has been built by Midas software by using the response spectrum method and dynamic time history analysis method to analyze cantilever construction method of the various stages of seismic response analysis. The results indicate that the bending moments of root segments of cantilever beams and the bottom sections of piers change greatly. So it should be attached importance to in design.

Simulation Analysis on Construction of Liangjiang Great Bridge

2014 ◽  
Vol 587-589 ◽  
pp. 1698-1702
Author(s):  
Min Si ◽  
Shi Xiang Bie ◽  
Bao Lai Li ◽  
Xiao Chun Fan
Keyword(s):  
Prestressed Concrete ◽  
Simulation Analysis ◽  
Bridge Construction ◽  
Long Span ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Initial Camber ◽  
High Pier ◽  
Cantilever Construction ◽  
Rigid Frame Bridge

Liangjiang Great Bridge is the prestressed concrete continuous rigid frame bridge with high pier and long-span. It adopts the segmented cantilever construction method. The process of its construction is the key to the construction control simulation analysis. In this paper, based on the characteristics of the bridge construction, finite element method is used to establish the simulation model. Cantilever construction stages and closure stages of bridge are simulated and analyzed. The structure deflection diagrams in the each section construction and the later construction considering the creep and shrinkage of concrete are obtained. The initial camber of each segment is given in the construction. The stress characteristics of key section are analyzed in the construction process. It provides a basis for monitoring and on-site construction of bridge and the reference for similar bridge construction.

Parameter Sensitivity Analysis of Vertical Deflection for Long-Span Continuous Rigid-Frame Bridge

2010 ◽  
Vol 163-167 ◽  
pp. 1500-1504 ◽  
Author(s):  
Heng Bin Zheng ◽  
Xiao Lin Yu ◽  
Jun Liang Hu ◽  
Quan Sheng Yan
Keyword(s):  
Sensitivity Analysis ◽  
Element Model ◽  
Simulation Method ◽  
Parameter Sensitivity ◽  
Parameter Sensitivity Analysis ◽  
Long Span ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Rigid Frame Bridge

The excessive long-term deflections of a long span continuous girder bridge may induce vehicles to move unsafely and hazard to the bridge operation, thus to limit the development of this bridge type. In this paper the main parameters influencing the long-term deflections of a continuous rigid-frame bridge, such as pre-stressed losses, mass distribution of the box girder and Young’s modules of concrete etc., were investigated. With the establishment of the finite element model of a real bridge and the premise of describing mechanism of each parameter, detailed parameter sensitivity analysis of long-term deflections were carried out with numerical simulation method. The results of this study may help to understand the main mechanism about the long-term deflection of continuous rigid-frame bridge and provide some reference for the wide use of this type of bridges.

Influence Analysis of Rigid Steel Framework on the Closure Section of the Bridge by Cantilever Construction Method

2012 ◽  
Vol 204-208 ◽  
pp. 2265-2271
Author(s):  
Fei Zheng ◽  
Guo Wen Li ◽  
Lei Yan ◽  
Peng Liu ◽  
Gang Zhang
Keyword(s):  
Prestressed Concrete ◽  
Bottom Flange ◽  
Box Girder ◽  
Continuous Rigid Frame Bridge ◽  
Compressive Stresses ◽  
Rigid Frame ◽  
Service Load ◽  
Internal Forces ◽  
Cantilever Construction ◽  
Rigid Frame Bridge

Nowadays,issues regarding deflections at mid-span and cracks existing on the box girder of prestressed concrete continuous rigid-frame bridge have raised researchers’ attentions in China.To solve these issues, research is conducted on the influence of rigid steel framework at closure segment of the box girder in the process of the cantilever construction of the PC continuous rigid-frame bridge. Finite element analyses are carried out through ANSYS to investigate the distributions of internal forces and stresses in rigid steel framework inside and outside the closure segment of the bridge. Further, the normal stresses of closure segment under service load and overloading conditions are evaluated and compared. Results show that the stresses redistributed to the inner rigid steel framework decrease 16.7% after post-tensioning operation, causing insufficient compressive stresses at the bottom flange of box girder around closure segment, and inner rigid steel framework may produce cracks on the bridge which should be considered seriously in the design and construction.

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