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.

Comparison of Structural Type and Economics of Super-High Pier for Continuous Rigid Frame Bridge

2014 ◽  
Vol 587-589 ◽  
pp. 1370-1376
Author(s):  
Guang Qiang Yang ◽  
Jin Yu Liu ◽  
Yang Zou ◽  
Shui Xing Zhou
Keyword(s):  
Prestressed Concrete ◽  
Elastic Stability ◽  
Structural Type ◽  
Variable Cross Section ◽  
Guizhou Province ◽  
Thin Wall ◽  
Variable Cross ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Rigid Frame Bridge

Three kinds of structural pier forms – double thin wall pier, combined pier and single pier – were designed for prestressed concrete continuous rigid frame bridge with pier height that overs 100m. Taking an example of Hezhang bridge which is located in Guizhou province, the elastic stability at the largest cantilever stage under action of wind loads were analyzed and concrete volume of pier and cushion cap were calculated. The results indicate that the variable cross-section pier has a better performance of elastic stability than that of uniform pier. Considering the construction difficulty, stability performance and material consumption, recommendations for selecting the structural type of pier with height between 100 m~200 m were given.

Load testing and health monitoring of monolithic bridges with innovative reinforcement

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Kexin Zhang ◽  
Tianyu Qi ◽  
Dachao Li ◽  
Xingwei Xue ◽  
Zhimin Zhu
Keyword(s):  
Health Monitoring ◽  
Construction Process ◽  
Content Type ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Steel Strand ◽  
Before And After ◽  
Load Tests ◽  
Rigid Frame Bridge ◽  
Strengthening Method

PurposeThe paper aims to investigate effectiveness of the strengthening method, the construction process monitoring, fielding-load tests before and after strengthening, and health monitoring after reinforcement were carried out. The results of concrete strain and deflection show that the flexural strength and stiffness of the strengthened beam are improved.Design/methodology/approachThis paper describes prestressed steel strand as a way to strengthen a 25-year-old continuous rigid frame bridge. High strength, low relaxation steel strand with high tensile strain and good corrosion resistance were used in this reinforcement. The construction process for strengthening with prestressed steel strand and steel plate was described. Ultimate bearing capacity of the bridge after strengthening was discussed based on finite element model.FindingsThe cumulative upward deflection of the second span the third span was 39.7 mm, which is basically consistent with the theoretical value, and the measured value is smaller than the theoretical value. The deflection value of the second span during data acquisition was −20 mm–10 mm, which does not exceed the maximum deflection value of live load, and the deflection of the bridge is in a safe state during normal use. Thus, this strengthened way with prestressed steel wire rope is feasible and effective.Originality/valueThis paper describes prestressed steel strand as a way to strengthen a 25-year-old continuous rigid frame bridge. To investigate effectiveness of the strengthening method, the construction process monitoring, fielding-load tests before and after strengthening and health monitoring after reinforcement were carried out.

Analysis of Crack Reason on Block No.0 of Continuous Rigid-Frame Bridge

2011 ◽  
Vol 71-78 ◽  
pp. 1392-1397 ◽  
Author(s):  
Wen Xiong Huang ◽  
Li Ying Tan ◽  
Kang Jing Zhou
Keyword(s):  
Temperature Difference ◽  
Construction Technology ◽  
Actual Situation ◽  
Construction Process ◽  
The Real ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Technology Process ◽  
Rigid Frame Bridge ◽  
Distribution Of Stress

Cracks on the Joint Part between Pier and Girder, namely Block NO.0 in the construction process, has become one of the major diseases of continuous rigid-frame bridges. Based on the real construction technology, process and environment of Yuquanxi Bridge, the uneven distribution of stress caused by various factors is precisely analyzed by ANSYS. The shrinkage difference of concrete, the excessive hydration heat, and the sunshine temperature difference is accurately simulated respectively. By comparing the numerical results with actual cracks condition, the results prove that the theoretical analyse is accord with the actual situation, and the real reason of cracks on Block No.0 of Yuquanxi Bridge is uncovered. This study is of great practical value in preventing cracks and improving bridge construction technology.

Studies on Lay Out Scheme of Steel Beam in Midspan Bottom Slab of Long-Span Continuous Rigid-Frame Bridge

2011 ◽  
Vol 183-185 ◽  
pp. 1933-1937
Author(s):  
Dan Lv ◽  
Yi Feng Zheng ◽  
Qun Zhao
Keyword(s):  
Steel Beams ◽  
Steel Beam ◽  
Tension Stress ◽  
Variable Cross ◽  
Long Span ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Straight Line ◽  
Rigid Frame Bridge ◽  
Bottom Slab

Most of steel beams in midspan bottom slab are fixed up following the shape of girder bottom edge with both ends anchoring to the bottom slab wedge. Due to the girder of long-span continuous rigid-frame bridge has variable cross section, the shape of steel beams in midspan bottom slab presents a curve opening downward, which does harm to the girder. Arranging steel beams along straight line in the bottom slab with both ends anchoring to the top wedge is better for girder to carry load. The analysis results of two methods analyzed by FEM shows that arranging of straight line lowers the stress of the top edge of girder meanwhile it increases the stress of bottom slab edge. Besides, the method lowers pressure stress and shear stress of the height middle of the girder where the steel beam anchoring and increases the main tension stress reservation which is good for the girder to carry load.

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.

Study on Rapid Closure Technology of Long Span Continuous Rigid Frame Bridge

2011 ◽  
Vol 255-260 ◽  
pp. 1120-1124
Author(s):  
Dong Lian Tan ◽  
Deng Ke Wang ◽  
Wen Ru Lu ◽  
Long Zhang ◽  
Xin Yuan Lin
Keyword(s):  
Prestressed Concrete ◽  
Internal Force ◽  
System Transformation ◽  
Construction Period ◽  
Long Span ◽  
Continuous Rigid Frame Bridge ◽  
Construction Procedure ◽  
Rigid Frame ◽  
Jacking Force ◽  
Rigid Frame Bridge

The choice of closure order of long span prestressed concrete continuous rigid frame bridge is the key part on its construction procedure, which has a big influence on the gross force and alignent of the whole structure. On the Basis of the Hanjiang bridge, the paper studies the closure order of long span prestressed concrete continuous rigid frame bridge and its system transformation procedure as well as the effect of jacking force etc. It shows that the technique of the midspan and the sidespan close at the same time not only meets the requirement of allowable internal force, but also has the benefit of shorten the construction period as well as reducing the degree of construction difficulty.

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.

Construction Stage Mechanical Performance Analysis of Long-Span Continuous Rigid Frame Bridge

2014 ◽  
Vol 1030-1032 ◽  
pp. 750-753
Author(s):  
Hua Su
Keyword(s):  
Finite Elements ◽  
Mechanical Performance ◽  
Internal Force ◽  
Construction Process ◽  
Construction Stage ◽  
Long Span ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Rigid Frame Bridge ◽  
Finite Elements Model

Accurate simulation of construction process of continuous rigid frame bridge is a foundation to make a bridge built accurately. Based on the suit iteration method, this paper used MIDAS to built a 3D finite elements model, the internal force and deformation results of each construction stage was obtained. This study provided a good theoretical reference for the control of long-span continuous rigid frame bridge construction..

Research on Setting of Pre-Camber of Long-Span Continuous Rigid Frame Bridge with High Piers

2011 ◽  
Vol 255-260 ◽  
pp. 821-825 ◽  
Author(s):  
Yun Bo Zhang ◽  
Da Peng Liu
Keyword(s):  
Live Load ◽  
Construction Process ◽  
Long Span ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Shrinkage And Creep ◽  
Post Operation ◽  
Late Loss ◽  
Rigid Frame Bridge ◽  
The Impact

In the design of continuous rigid frame bridge setting reasonable pre-camber can eliminate the impact of various loads on the linear in construction process, reduce shrinkage and creep in the process of post-operation, the late loss of pre-stressed, deformation produced by live load and so on ,resulting in deflection phenomenon. Based on the current specifications of the continuous rigid frame bridge camber setting methods, this thesis proposes the reasonable setting suggestions of pre-camber and sets examples to illustrate this.

Sign in / Sign up

Export Citation Format

Share Document