Study on the Influence of Beam Rigidity on Continuous Rigid Frame Bridge with Moving Vehicle

2012 ◽  
Vol 446-449 ◽  
pp. 1067-1070
Author(s):  
Rong Xia Wang ◽  
Xiang Shang Chen ◽  
Fan Li ◽  
Shao Wei Zhao
Keyword(s):  
Dynamic Load ◽  
Natural Vibration ◽  
Internal Force ◽  
Natural Vibration Frequency ◽  
Moving Vehicle ◽  
Continuous Rigid Frame Bridge ◽  
Vehicle Load ◽  
Rigid Frame ◽  
Bridge Model ◽  
Rigid Frame Bridge

The continuous rigid frame bridge has been applied widely in our country. But in recent years, over-deflection of beam in this bridge has become an serious problem. This may cause the redistribution of displacement and internal force of the whole structure, especially in dynamic load status. A two-dimensional pile-soil-bridge model is built up in ANSYS based on a factual bridge. The over-deflection is considered as the decrease of beam elastic modulus or rigidity. The displacement and internal force of key parts are analysed in static and dynamic vehicle load. The study shows that over-deflection will reduce the first three natural vibration frequency, weaken the sensitivity of bridge to dynamic load. In dynamic load status, the displacement and internal force will be influenced by beam rigidity.

Effect Evaluation of Web Reinforcement of Continuous Rigid Frame Bridge

2014 ◽  
Vol 501-504 ◽  
pp. 1021-1026
Author(s):  
Ping Jie Li ◽  
Yu Wen Dai ◽  
Guo Bao Li ◽  
Ming Hui Wei
Keyword(s):  
Prestressed Concrete ◽  
Natural Vibration ◽  
Element Model ◽  
Natural Vibration Frequency ◽  
Effect Evaluation ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Web Reinforcement ◽  
Rigid Frame Bridge ◽  
The Finite Element Model

Based on a prestressed concrete continuous rigid frame bridge reinforcement project, the finite element model of the bridge was established, which includes two kinds of work condition of before and after bridge reinforcement. The finite element model had analyzed the change of natural frequency, deflection and bending stiffness after the web reinforcement of a prestressed concrete continuous rigid frame bridge, in which we have got analysis results that web reinforcement bridge deflection is less than before reinforcement, and the changing law is obvious as inversely proportional relationship, at the same time, the changing law of natural vibration frequency of web reinforcement bridge and original bridge is not obvious, so only deflection but natural vibration frequency can effect evaluation of web reinforcement of continuous rigid frame bridge.

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.

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.

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..

scholarly journals Design and Construction Strategy of Arched Continuous Rigid-frame Bridge

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Yueqi Gao
Keyword(s):  
Road Traffic ◽  
Rapid Development ◽  
Social Background ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Bridge Model ◽  
Construction Strategy ◽  
Urbanization In China ◽  
Rigid Frame Bridge ◽  
Design And Construction

With the current rapid development of urbanization in China, people's living standards have been greatly improved. In the context of such a development background, the requirements for road traffic are getting more stringent, especially for bridge projects. The arched continuous rigid-frame bridge was developed under this social background. The advantage of the bridge lies in the design of a bridge model that integrates various functions such as transportation, landscape, and sightseeing. Based on the above, this paper first refers to the case to analyze the design and construction strategy of the arched continuous rigid-frame bridge, in hope of providing a valuable reference for relevant personnel.

Stochastic Finite Element Analysis for Shrinkage and Creep of a Concrete Bridge Based on LHS

2010 ◽  
Vol 163-167 ◽  
pp. 1744-1748
Author(s):  
Zhi Fang Lu ◽  
Mu Yu Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Internal Force ◽  
Concrete Bridge ◽  
Stochastic Finite Element Method ◽  
Stochastic Finite Element ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Shrinkage And Creep ◽  
Rigid Frame Bridge

Shrinkage and creep are the inherent properties of concrete bridge. According to Latin Hypercube Sampling method (LHS) and concrete bridge shrinkage and creep uncertainty parameters, this paper promotes stochastic finite element method based on LHS for concrete bridge shrinkage and creep uncertainty analysis in ANSYS random analysis model. Based on this stochastic finite element method, internal force and long-term deformation of a continuous rigid frame bridge with density gradient concrete is analyzed. Result show, internal force and deformation of continuous rigid frame bridge after completing are reasonable and satisfy Code requirement, and are various in previous 3 years at service stage and trend to steadily after 3 years. Research result provides theoretical basis for shrinkage and creep uncertainty further analysis in concrete bridge.

Study on the Influence of Beam Rigidity on Continuous Rigid Frame Bridge with Moving Vehicle

2012 ◽  
Vol 446-449 ◽  
pp. 1067-1070
Author(s):  
Rong Xia Wang ◽  
Xiang Shang Chen ◽  
Fan Li ◽  
Shao Wei Zhao
Keyword(s):  
Moving Vehicle ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Rigid Frame Bridge

scholarly journals Modified Multi-Support Response Spectrum Analysis of Structures with Multiple Supports under Incoherent Ground Excitation

2019 ◽  
Vol 9 (9) ◽  
pp. 1744 ◽  
Author(s):  
Shen ◽  
Li ◽  
Shi ◽  
Zhou
Keyword(s):  
Power Spectrum ◽  
Degrees Of Freedom ◽  
Response Spectrum ◽  
Structural Response ◽  
Structural Power ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Bridge Model ◽  
Displacement Vectors ◽  
Rigid Frame Bridge

This study develops a modified multi-support response spectrum (MSRS) method, in order to efficiently and accurately calculate the response of multi-support structures under incoherent ground motions. The modified MSRS method adopts three ancillary processes, constructing structural displacement vectors or constructing infinite stiffness members or increasing the degrees of freedom at structural supports. Then, the modified MSRS method is verified in a comparison with the existing MSRS method through a model of a five-span reinforced concrete continuous rigid frame bridge. Finally, the collective structural response spectrum, the structural power spectrum, and the simplified structural power spectrum are deduced from the equation of the motion taking ground motion displacements as the input, and validated through the same bridge model.

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