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 of Effective Pre-Stress of Continuous Rigid Frame Bridge in Service Based on Inversion Theory

2013 ◽  
Vol 671-674 ◽  
pp. 1012-1015
Author(s):  
Zhao Ning Zhang ◽  
Ke Xing Li
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Inversion Method ◽  
Vertical Deflection ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Inversion Theory ◽  
Rigid Frame Bridge ◽  
The Finite Element Model

Due to the environment, climate, loads and other factors, the pre-stress applied to the beam is not a constant. It is important for engineers to track the state of the pre-stress in order to ensure security of the bridge in service. To solve the problem mentioned above, the paper puts forward a new way to analyze the effective pre-stress using the displacement inversion method based on the inversion theory according to the measured vertical deflection of the bridge in service at different time. The method is a feasible way to predict the effective pre-stress of the bridge in service. Lastly, taking the pre-stressed concrete continuous rigid frame bridge for example, the effective pre-stress is analyzed by establishing the finite element model.

scholarly journals Analysis of Non-Uniform Shrinkage Effect in Box Girder Sections for Long-Span Continuous Rigid Frame Bridge

2018 ◽  
Vol 13 (2) ◽  
pp. 146-155 ◽  
Author(s):  
Zhuoya Yuan ◽  
Pui-Lam Ng ◽  
Darius Bačinskas ◽  
Jinsheng Du
Keyword(s):  
Finite Element ◽  
General Purpose ◽  
Element Analysis ◽  
Box Girder ◽  
Finite Element Program ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Shrinkage Effect ◽  
Rigid Frame Bridge

To consider the effect of non-uniform shrinkage of box girder sections on the long-term deformations of continuous rigid frame bridges, and to improve the prediction accuracy of analysis in the design phase, this paper proposes a new simulation technique for use with general-purpose finite element program. The non-uniform shrinkage effect of the box girder is transformed to an equivalent temperature gradient and then applied as external load onto the beam elements in the finite element analysis. Comparative analysis of the difference in deflections between uniform shrinkage and nonuniform shrinkage of the main girder was made for a vehicular bridge in reality using the proposed technique. The results indicate that the maximum deflection of box girder under the action of non-uniform shrinkage is much greater than that under the action of uniform shrinkage. The maximum downward deflection of the bridge girder caused by uniform shrinkage is 5.6 mm at 20 years after completion of bridge deck construction, whereas the maximum downward deflection caused by non-uniform shrinkage is 21.6 mm, which is 3.8 times larger. This study shows that the non-uniform shrinkage effect of the girder sections has a significant impact on the long-term deflection of continuous rigid frame bridge, and it can be accurately simulated by the proposed transformation technique.

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.

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 Seismic Response Analysis of Continuous Rigid-Frame Bridge - Energy Method

2011 ◽  
Vol 378-379 ◽  
pp. 251-255
Author(s):  
Qi Cai Yu ◽  
Ai Rong Liu ◽  
Ren Xiong ◽  
Hui Jun Yu
Keyword(s):  
Finite Element ◽  
Energy Method ◽  
Reinforcement Ratio ◽  
Degree Of Freedom ◽  
Response Analysis ◽  
Energy Response ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Rigid Frame Bridge ◽  
The Impact

A 3D Finite Element model of a continuous rigid-frame bridge is constructed by the Midas/Civil bridge finite element analysis program in this paper, where fiber elements and plastic hinges are used for bridge piers. The lump mass method is used to simplify the infinite-degree-of-freedom continuous rigid-frame bridge into a multi-degree of freedom model. The energy solution of continuous rigid-frame bridge is given, and the time-history analysis of the bridge is applied. In addition, the energy response of continuous rigid-frame bridge with different pier height and reinforcement ratio are given based on the energy method, revealing the impact of pier height and reinforcement ratio on the displacement and energy response of continuous rigid-frame bridge.

Analysis of Effective Pre-Stress and Stiffness of the Continuous Rigid Frame Bridge in Service Based on Inversion Theory

2013 ◽  
Vol 351-352 ◽  
pp. 1108-1111
Author(s):  
Zhao Ning Zhang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Inversion Method ◽  
Vertical Deflection ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Inversion Theory ◽  
Rigid Frame Bridge ◽  
The Finite Element Model

Due to the shrinkage, creep, friction and other factors, the pre-stress applied to the beam is not a constant. It is important to obtain the information of the pre-stress in order to ensure security of the bridge in service. To solve the problem mentioned above, the paper puts forward a new way to analyze the effective pre-stress using the displacement inversion method based on the inversion theory according to the measured vertical deflection of the bridge in service at different time. The method is a feasible way to predict the effective pre-stress of the bridge in service. Lastly, taking the pre-stressed concrete continuous rigid frame bridge for example, the effective pre-stress and stiffness are analyzed by establishing the finite element model.

Sensitivity Analysis on the Influence Factors of Mid-Span Deflection for Continuous Rigid Frame Bridge

2014 ◽  
Vol 1065-1069 ◽  
pp. 908-911
Author(s):  
Tian Hua Jiang ◽  
Li Ai ◽  
Lei Chen ◽  
Hong Xu
Keyword(s):  
Sensitivity Analysis ◽  
Influence Factors ◽  
Continuous Rigid Frame Bridge ◽  
Structural Rigidity ◽  
Rigid Frame ◽  
Vehicle Loads ◽  
The Common ◽  
Rigid Frame Bridge

The common problem of continuous rigid frame bridge is excessive mid-span deflection. The three factors of excessive deflection including vehicle loads, structural rigidity and prestressed loss are discussed on the case of a three spans continuous rigid frame bridge. Midas Civil is applied to analyze the sensitivity of mid-span deflection for these factors. The results indicate that the deflection is increasing with the increase of vehicle loads or the decrease of structural rigidity or the increase of prestressed loss. Furthermore, mid-span deflection is the most sensitive to the change of prestressed loss.

Calculation of Shrinkage-Creep Analysis for Long-Span Concrete Continuous Rigid Frame Bridge

2011 ◽  
Vol 71-78 ◽  
pp. 1511-1515
Author(s):  
Can Bin Yin ◽  
Fang Yu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Construction Process ◽  
Deformation Prediction ◽  
Long Span ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Creep Analysis ◽  
Rigid Frame Bridge

Take Longtan river super large bridge as example,establishing finite element model with Bridge Doctor to analysis the influence shrinkage and creep.The deformation prediction of the bridge in the construction process and after completion was made based onseveral.Each prediction results were analyzed and compared.

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