scholarly journals Analysis of Stress Inhomogeneous Coefficient of a Continuous Rigid Frame Bridge during Construction Stage

2018 ◽  
Vol 175 ◽  
pp. 03016
Author(s):  
Jing-xian Shi ◽  
Zhi-hong Ran ◽  
Lu-chang Zhao
Keyword(s):  
Calculation Model ◽  
Bridge Structure ◽  
Shear Lag ◽  
Construction Stage ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Lateral Inhomogeneity ◽  
Rigid Frame Bridge ◽  
Distribution Of Stress ◽  
Stress Inhomogeneity

The box section which can meet the requirements of wider deck is widely used in the construction of continuous rigid frame bridge. However, the shearing force lag is very obvious, which causes the inhomogeneous distribution of stress in the cross section, and it may threaten the safety of the bridge structure when it is serious. Taking a continuous rigid frame bridge located in Yunnan, China as an example, this paper establishes the finite element calculation model of the bridge to analyze the stress inhomogeneity in the construction stage. The results show that the shear lag coefficient of the section is constantly changing during the dynamic process of construction, with the increase of the length of the cantilever, the shear lag coefficient gradually converges to 1; prestress is the most important factor that causes the lateral inhomogeneity of the positive stress.

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.

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.

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..

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.

Static and Dynamic Behavior of the High-Pier and Long-Span Continuous Rigid Frame Bridge

2013 ◽  
Vol 639-640 ◽  
pp. 474-480 ◽  
Author(s):  
Jian Xin Liu ◽  
Ying Wang ◽  
Mei Chun Zhu ◽  
Zhi Hong Zhang ◽  
Xin Hua Zhang ◽  
...  
Keyword(s):  
Time History ◽  
Response Analysis ◽  
Bridge Structure ◽  
The Finite Element Method ◽  
Long Span ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Internal Forces ◽  
High Pier ◽  
Rigid Frame Bridge

A structure model of three-span continuous rigid frame bridge was constructed based on the finite element method. Firstly, the static performances were obtained. Secondly, the modal analysis was performed to get the natural frequencies and periods. The dynamic characteristics of the bridge structure were summarized, and some improvement guidelines are suggested to overcome the shortcoming for the bridge structure. Then, seismic response analysis was carried out based on the EL-Centro wave. The input excitations adopted the combination of vertical wave plus longitudinal wave, or vertical wave plus lateral wave, or the combination of three directions. Based on the three excitation cases, some useful results were obtained, which include internal forces, displacements, accelerations time-history curves of the critical sections for the bridge structure. And some comments about the time-history curves are given. At last, some helpful conclusions are drawn based on the calculation and analysis above. The calculation methods and results in this paper can provide some referenced information for the engineering design.

Asymmetric of Continuous Rigid Frame Bridge Precamber and Construction

2013 ◽  
Vol 361-363 ◽  
pp. 1228-1231
Author(s):  
Wan Quan Tong
Keyword(s):  
Finite Element ◽  
Prestressed Concrete ◽  
Bridge Structure ◽  
Construction Process ◽  
Finite Element Program ◽  
Expansion Joints ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Element Program ◽  
Rigid Frame Bridge

Prestressed concrete continuous rigid frame bridge has the advantages of no expansion joints, smooth driving the advantages,however, due to cross under serious scratch,seriously affect the service life of the bridge.Take a Large span asymmetric continuous rigid frame bridge of Guizhou as engineering background,use finite element Program Midas/Civil modeling,carried out Analysis of the construction process,And select a reasonable way to Set the bridge pre-camber,and provide reasonable data for the construction of control,to ensure the bridge structure linear reasonable.

Finite Element Analysis about Dynamic Characteristics of the High-Pier and Long-Span Continuous Rigid Frame Bridge

2011 ◽  
Vol 243-249 ◽  
pp. 1876-1880
Author(s):  
Ying Wang ◽  
Jian Xin Liu ◽  
Chong Wang
Keyword(s):  
Finite Element ◽  
Dynamic Characteristics ◽  
Time History ◽  
Response Analysis ◽  
Bridge Structure ◽  
Element Analysis ◽  
Long Span ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Rigid Frame Bridge

A structure model of three-span continuous rigid frame bridge was constructed based on the finite element method. At first, the modal analysis was performed to get the natural frequencies and periods. The dynamic characteristics of the bridge structure were summarized, and some improvement measures are suggested to overcome the shortcoming for the bridge structure. Then, seismic response analysis was carried out based on the EL-Centro wave. The input excitations adopted the combination of vertical wave plus longitudinal wave, or vertical wave plus lateral wave. Based on the two excitation cases, some useful results were obtained, which include internal forces, displacements, accelerations time-history curves of the critical sections for the bridge structure. And some commentates about the time-history curves are given. At last, some helpful conclusions are drawn based on the calculation and analysis above. The calculation methods and results in this paper can provide some referenced information for the engineering design.

Measuring and Analysis of Local Stress under Anchorage of Continuous Rigid Frame Bridge

2010 ◽  
Vol 163-167 ◽  
pp. 1268-1273
Author(s):  
Wei Feng Wang ◽  
Guo Qing Zheng ◽  
Zhi Lin Zhang ◽  
Xiao Song
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Local Stress ◽  
Bridge Structure ◽  
Anchor Plate ◽  
Box Girder ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Rigid Frame Bridge ◽  
Element Method

Under the Large Tonnage Pre-Stress, the stress of concrete which is under the anchor plate is complicated. To ensure the safety of construction and structure, the condition of local stress of the bridge structure should be investigated. When the pre-stress steel of Segment 1# of Pier 1# of Hongwuwo Bridge is tensioned, the strain situation of concrete near the anchor plate of the box girder is measured. The measured value is compared with the analytical value which is obtained through space finite element method.

scholarly journals Study on bridge checking evaluation based on deformation-Stress data

2018 ◽  
Vol 38 ◽  
pp. 03054
Author(s):  
Jing Xian Shi ◽  
Ying Jie Cheng
Keyword(s):  
Linear Relationship ◽  
Structural State ◽  
Inspection System ◽  
Bridge Structure ◽  
K Value ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Deformation Stress ◽  
Rigid Frame Bridge ◽  
Specific Section

Bridge structure plays a very important role in human traffic. The evaluation of bridge structure after a certain period of operation has always been the focus of the bridge. Based on the data collected from the health inspection system of a continuous rigid frame bridge on a highway in Yunnan, China, it is found that there is a certain linear relationship between the deformation and stress of the bridge structure. In view of a specific section of the structure, the stress value of this section can be derived according to its deformation value. The coefficient K can be calculated by comparing the estimated value to the actual measured value. According to the range of the K value, the structural state of the bridge can be evaluated to a certain extent.

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