Analysis of the Causes of the Formation of Crack in Inclined Web of Prestressed Concrete Continuous Girder Bridge in Cantilever Construction

2012 ◽  
Vol 256-259 ◽  
pp. 1614-1617
Author(s):  
Li Hua Lu ◽  
Peng Tian ◽  
Tao Yu
Keyword(s):  
Prestressed Concrete ◽  
Paper Analysis ◽  
Additional Stress ◽  
Different Temperatures ◽  
Continuous Girder Bridge ◽  
Girder Bridge ◽  
Cantilever Construction ◽  
The Way

The crack in inclined web of the prestressed concrete continuous girder bridge which is constracted by the way of cast-in-place cantilever method that become one problem that should be more cared about[1-2]. This paper analysis the bridge in three different conditions which are according to the pratical and special engineering to find the causes of the formation of crack in inclined web of prestressed concrete continuous girder bridge in cantilever construction. The results of the analysis show that the additional stress caused by the different temperatures between internal and external components leads to the formation of the crack in inclined web of the bridge.

scholarly journals The Application of the Grey Neural Network in the Deflection Control of PC Rigid Frame Continuous Box Girder Bridges

2014 ◽  
Vol 8 (1) ◽  
pp. 416-419
Author(s):  
Lifeng Wang ◽  
Hongwei Jiang ◽  
Dongpo He
Keyword(s):  
Neural Network ◽  
Prestressed Concrete ◽  
Control Process ◽  
Construction Control ◽  
Box Girder Bridges ◽  
Girder Bridges ◽  
Rigid Frame ◽  
Continuous Girder Bridge ◽  
Girder Bridge ◽  
Cantilever Construction

Deflection control is the crucial procedure in construction control of cantilever prestressed concrete continuous girder bridge. This paper summarizes the advantages of Grey theory’s poor information processing and abilities of Neural Network’s self-learning and adaption, and the combinational algorithm of grey Neural Network is applied to the prestressed concrete bridge cantilever construction control process. Firstly, GM (1, 1) model and BP artificial Neural Network algorithm to predict the elevation of construction process are introduced respectively. In addition, the elevation prediction model of rigid-framed-continuous girder bridge is established. By practicing in the construction control project of LongHua Bridge, the method is testified to be feasible. The results indicate that, the combinational algorithm of Gray Neural Network to predict the construction elevation has higher reliability and accuracy which can be an effective tool of construction control for the same type bridges.

Optimization on Closure Scheme of Multi-Span Prestressed Concrete Box-Girder Bridge

2010 ◽  
Vol 163-167 ◽  
pp. 2369-2375 ◽  
Author(s):  
Ming Yuan ◽  
Dong Huang Yan
Keyword(s):  
Stress State ◽  
Prestressed Concrete ◽  
Box Girder ◽  
Rigid Frame ◽  
Closure Scheme ◽  
Concrete Box Girder ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Cantilever Construction ◽  
Rigid Frame Bridge

The stress state of finished bridge and service stage is influenced by various closure schemes in cantilever construction of multi-span prestressed concrete box-girder bridge. Two typical bridges—multi-span prestressed concrete continuous rigid frame bridge and girder bridge are investigated, The stress state in different closure schemes are analyzed using finite element(FE) analysis. Meanwhile, compared the healthy monitoring data, it has been found that taking the closure sequence from side span to middle span in cantilever construction of multi-span prestressed concrete box-girder bridge can lower stress of girder and pier in finished bridge stage, as well as reducing deformation of girder in service stage. Hence, the closure sequence from side span to middle span is more suitable for cantilever construction of multi-span prestressed concrete box-girder bridge.

Prestressed Concrete Continuous Girder Bridge Reinforcement Simulation Analysis and Carrying Capacity Assessment

2012 ◽  
Vol 594-597 ◽  
pp. 1516-1521
Author(s):  
Ling Yu ◽  
Tie Zhu Qiao ◽  
Long Sheng Bao ◽  
Guang Shan Zhu
Keyword(s):  
Compressive Stress ◽  
Cross Section ◽  
Prestressed Concrete ◽  
Carrying Capacity ◽  
Simulation Analysis ◽  
Tension Stress ◽  
Reinforced Concrete Structure ◽  
Standard Requirement ◽  
Continuous Girder Bridge ◽  
Girder Bridge

This article simulates prestressed concrete continuous girder bridge reinforced many times and evaluates carrying capacity after reinforcement. Taking the FuFeng bridge for an example, we analyze the bridge’s stress state in using by Midas software, evaluate the concrete ability of crack resistance, check the reinforced concrete structure ultimate carrying capacity, the cracking resistance and the stiffness, assess reinforcement effect and verify the accuracy and reliability of the simulation results. The maximum main compressive stress, maximum compressive stress, maximal main tensile stress and maximum tension stress of mid-span cross-section of the bridge are 1.6Mpa, 1.6Mpa, 0.3~0.5Mpa, and -1.2Mpa respectively, the mid-span center cross-section of deflection is 2.89cm. Reinforcement suppresses the development and expansion of the crack; the mid-span deflection tends to stabilize; the ultimate bearing capacity meets the Standard requirement basically; the emergency capacity is not enough; and the car whose weight over 55 tons is prohibited from passing.

Procedure Inversion Effect Analysis of Final System Transformation of Prestressed Concrete Continuous Girder Bridge

2014 ◽  
Vol 501-504 ◽  
pp. 1323-1327
Author(s):  
Xu Luo ◽  
Lu Rong Cai
Keyword(s):  
Stress Distribution ◽  
Prestressed Concrete ◽  
Steel Beams ◽  
System Transformation ◽  
Box Girder ◽  
Pull Out ◽  
Temporary Support ◽  
Continuous Girder Bridge ◽  
Girder Bridge ◽  
Prestressing Loss

When the cantilever construction is adopted by the prestressed concrete continuous girder bridge, the order of two key procedures between removing temporary support and tensing remanent prestressed cable is used to be ignored. In order to study the influence of procedure inversion, the influences on bridge shape, stress distribution and prestressing loss were calculated for one common prestressed continuous concrete box girder bridge by MIDAS CIVIL 2006, respectively. The obtained result presents that: the influence on the bridge shape and the prestressing loss are not apparent, but the influence on the stress distribution is serious; the maximal compressive stress of procedure inversion is more 42.3% than common construction procedure only by tensing the remaining steel beams at box girder; especially, the combining area between the box girder and temporary support is easy to pull out. So, the procedure inversion construction method cant be accepted.

Based on the Different Specifications of Jacking Construction of Continuous Girder Bridge Reliability Analysis

2014 ◽  
Vol 584-586 ◽  
pp. 2017-2022
Author(s):  
Jian Kang Shen
Keyword(s):  
Reliability Analysis ◽  
Cross Section ◽  
Prestressed Concrete ◽  
Reliability Index ◽  
Element Model ◽  
Construction Stage ◽  
Calculation Results ◽  
Continuous Girder Bridge ◽  
Bridge Reliability ◽  
Girder Bridge

The purpose of this paper is aimed at according to the "highway reinforced concrete and prestressed concrete bridge and culvert design specifications (JTG D62-2004) and (JTJ 023-85) design of jacking construction of continuous girder bridge for reliability analysis. By establishing a finite element model of construction stage and into a bridge stage respectively the reliability index of the typical cross section is analyzed. Aiming at construction stage, by choosing typical cross section of reliability analysis, draw a cross section of reliability index with the change of construction stage. Calculation results show that, according to JTG D62-2004 specification of reliability index calculation results than based on results of calculating the JTJ 023-85 specification. In this paper, the analysis results can provide reference for pushing the construction of the continuous girder bridge design.

Numerical Analysis on the Dynamic Characteristics of South-to-North Water Division Bridge during the Cantilever Construction Stage

2012 ◽  
Vol 204-208 ◽  
pp. 2200-2204
Author(s):  
Jun Chao Zuo
Keyword(s):  
Numerical Analysis ◽  
Dynamic Characteristics ◽  
Prestressed Concrete ◽  
Construction Stage ◽  
Modal Shape ◽  
Box Girder ◽  
Modal Frequency ◽  
North Water ◽  
Girder Bridge ◽  
Cantilever Construction

The South-to-North Water Division Bridge is a prestressed concrete composite box-girder bridge with corrugated steel webs constructed by cast-in-place cantilever method. Its modal shape and modal frequency were calculated during each cantilever construction stage. And the formula about the relation between length of cantilever and natural frequency was derived.

Stress Analysis of High Thin-Walled Box Girder Bridge in Chong He Bridge

2012 ◽  
Vol 594-597 ◽  
pp. 1494-1497
Author(s):  
Pi Xiang Wang ◽  
Ke Xin Yu ◽  
Jiang Di
Keyword(s):  
Prestressed Concrete ◽  
Stress Monitoring ◽  
Real Time Control ◽  
Box Girder ◽  
Whole Process ◽  
Time Control ◽  
Thin Walled ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Cantilever Construction

Based on the Chong He Bridge as research object, this paper expounds the purposes, methods and analysis results of prestressed concrete continuous thin-walled box girder bridge in the process of cantilever construction. The purpose of the research is to make a reasonable structure which meets the designed stress monitoring and to ensure the quality of construction. The method is to layout stress control points in the main control section and conduct real-time control. The result shows that the beam stress is within the safety range and can predict that the structure meets strength requirements in next stage. The conclusion is that through the data analysis, the results guide the whole process of bridge construction as well as fit the design plan.

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