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.

The Key Construction Techniques of Long Span Continuous Rigid Frame Bridge of the Expressway in Mountain Areas

2014 ◽  
Vol 1055 ◽  
pp. 127-130
Author(s):  
Dian Dong Shen ◽  
Quan Zheng
Keyword(s):  
Temperature Difference ◽  
Pile Foundation ◽  
Large Temperature ◽  
Construction Process ◽  
Mountain Areas ◽  
Long Span ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Construction Techniques ◽  
Rigid Frame Bridge

At present, long span continuous rigid frame bridge is widely used in the expressway in mountain areas. Mountain areas have the features of terrain with continuous ridges and peaks, crisscross network of ravines, changeable climate and large temperature difference between day and night, while continuous rigid frame bridge of the expressway in mountain areas usually has long pile foundation, great bulk of bearing platform, high main pier and long span, which all increase the construction difficulty of long span continuous rigid frame bridge of the expressway in mountain areas. This paper will take the construction process of Longtan River Bridge built in Hurong Xi highway in Hubei province as an example, to study and discuss the key construction techniques of long span continuous rigid frame bridge of the expressway in mountain areas.

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.

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.

Temperature Field Test and Research of Box-Pier and Box-Girder for Long Span Continuous Rigid Frame Bridge

2011 ◽  
Vol 90-93 ◽  
pp. 969-974
Author(s):  
Jie Jun Wang ◽  
Ke Ke Yang ◽  
Can Bin Yin
Keyword(s):  
Temperature Field ◽  
Temperature Difference ◽  
Least Square Method ◽  
Least Square ◽  
Box Girder ◽  
Linear Temperature ◽  
Long Span ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Rigid Frame Bridge

Longtan River Bridge, which the length of the main span is 200m and the height of the main pier is 178m, is a long span continuous rigid frame bridge. Temperature field of the box-pier and the box-girder due to solar radiation were measured. Regression analysis of the temperature difference has been done by using the least square method, and the fitting curve of the vertical and the transverse non-linear temperature difference distribution of box-pier and box-girder are obtained in this paper

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.

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.

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.

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.

Control Technology on Jacking Closure Construction of Liangjiang Great Bridge

2014 ◽  
Vol 587-589 ◽  
pp. 1430-1434
Author(s):  
Hao Jie Zhang ◽  
Zi Qiang Peng ◽  
Bao Lai Li ◽  
Xiao Chun Fan
Keyword(s):  
Prestressed Concrete ◽  
Reference Value ◽  
Bridge Engineering ◽  
Construction Technology ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Element Simulation ◽  
Jacking Force ◽  
Working Procedure ◽  
Rigid Frame Bridge

Prestressed concrete continuous rigid frame bridge is widely used in bridge engineering. Its closure is one of very important working procedure in the bridge construction. In this paper, taking Liangjiang Great Bridge in Xinxu Highway as an example, the methods for determining the Jacking force and displacement are discussed. The implementation of the process and construction technology of closure jacking scheme is introduced in detail. Through the finite element simulation, the stress state of on the structural pusher is analyzed. And the maximum stress of the pier bottom and the displacement of the pier top are obtained. They can verify the feasibility of the scheme. Monitoring results from the site construction verify the safety of the scheme. The method has a certain reference value on jacking closure construction for the similar bridge.

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