Analytic Method of Stability of Rigid Frame Bridge with Double-Limb Thin-Walled Piers

2014 ◽  
Vol 501-504 ◽  
pp. 1136-1139
Author(s):  
Xiu Lan Wang ◽  
Wen Qiang Chen
Keyword(s):  
Element Model ◽  
Calculation Error ◽  
Analytic Method ◽  
Dead Load ◽  
Buckling Loads ◽  
Effective Height ◽  
Rigid Frame ◽  
Thin Walled ◽  
The Stability ◽  
Rigid Frame Bridge

Based on the stability theory of column ,this paper did research on the solving methods of buckling eigenvalue when the rigid frame bridge was subjected to dead load . When solving the critical failure force, you could consider the height of piers as the effective height, consider the sum of the loads of upper structure and half of the weight of the piers as the equivalent buckling loads. Finite element model was created for verifying the solving method introduced in this paper. The results shows that in the maximum cantilever phase , the calculation error of buckling eigenvalue was decreased as the height of piers was increased ; the method in this paper was more accurate on the completed bridge stage . When the height of two piers was different, you can calculate each piers buckling eigenvalue, the buckling eigenvalue of the whole bridge was the average of every pier.

Analysis of Effective Pre-Stress of Continuous Rigid Frame Bridge in Service Based on Inversion Theory

2013 ◽  
Vol 671-674 ◽  
pp. 1012-1015
Author(s):  
Zhao Ning Zhang ◽  
Ke Xing Li
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Inversion Method ◽  
Vertical Deflection ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Inversion Theory ◽  
Rigid Frame Bridge ◽  
The Finite Element Model

Due to the environment, climate, loads and other factors, the pre-stress applied to the beam is not a constant. It is important for engineers to track the state of the pre-stress in order to ensure security of the bridge in service. To solve the problem mentioned above, the paper puts forward a new way to analyze the effective pre-stress using the displacement inversion method based on the inversion theory according to the measured vertical deflection of the bridge in service at different time. The method is a feasible way to predict the effective pre-stress of the bridge in service. Lastly, taking the pre-stressed concrete continuous rigid frame bridge for example, the effective pre-stress is analyzed by establishing the finite element model.

Analysis of Effective Pre-Stress and Stiffness of the Continuous Rigid Frame Bridge in Service Based on Inversion Theory

2013 ◽  
Vol 351-352 ◽  
pp. 1108-1111
Author(s):  
Zhao Ning Zhang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Inversion Method ◽  
Vertical Deflection ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Inversion Theory ◽  
Rigid Frame Bridge ◽  
The Finite Element Model

Due to the shrinkage, creep, friction and other factors, the pre-stress applied to the beam is not a constant. It is important to obtain the information of the pre-stress in order to ensure security of the bridge in service. To solve the problem mentioned above, the paper puts forward a new way to analyze the effective pre-stress using the displacement inversion method based on the inversion theory according to the measured vertical deflection of the bridge in service at different time. The method is a feasible way to predict the effective pre-stress of the bridge in service. Lastly, taking the pre-stressed concrete continuous rigid frame bridge for example, the effective pre-stress and stiffness are analyzed by establishing the finite element model.

Analysis of Mechanical Behaviors of a Single Pylon Cable-Stayed and Continuous Rigid-Frame Composite Bridge

2010 ◽  
Vol 163-167 ◽  
pp. 2219-2223 ◽  
Author(s):  
Dong Ming Feng ◽  
Ai Qun Li ◽  
Jian Hui Li ◽  
Guang Yang
Keyword(s):  
Element Model ◽  
Stay Cable ◽  
Mechanical Behaviors ◽  
Xijiang River ◽  
Subspace Iteration ◽  
Rigid Frame ◽  
Long Run ◽  
Frame System ◽  
Composite Bridge ◽  
Rigid Frame Bridge

Xijiang River Bridge is the first hybrid railway bridge composed of single pylon cable-stayed and continuous rigid-frame system in China. To study the mechanical behaviors of the novel bridge, 3-D finite element model (FEM) based on Midas/Civil software is created; spatial effect of stayed cable is discussed; the self-vibration behavior of this unique bridge is analyzed by adopting the subspace iteration method; then by means of simulating analysis of the whole construction process, stress paths of critical parts in different construction stages are calculated and presented to study its mechanical behaviors. Results reveal that the composite bridge embodies features of both traditional cable-stayed bridge and rigid-frame bridge. Further study, however, shows that the unique hybrid system is mostly characterized by the rigid-frame type, meanwhile, as safety storage, the stay cable will play an important role in the “stiffness kept” of the whole structure, improving the actual stress and working condition of the whole structure in the long run.

Analysis of force factors of a thin-walled shell metalworks

2021 ◽  
pp. 35-39
Author(s):  
I.F. D’yakov ◽  
Yu.V. Moiseev
Keyword(s):  
Metal Structure ◽  
Machine Building ◽  
Structure Calculation ◽  
Calculation Error ◽  
Building Structure ◽  
The Finite Element Method ◽  
Equilibrium Equations ◽  
Thin Walled ◽  
The Stability ◽  
System Of Equilibrium Equations

The method of refining the power factors of a machine-building structure presented in the form of a shell is described. The stability of a thin-walled shell is analyzed using a system of equilibrium equations taking into account changes in its shape. The concept of shell stability is considered for generalized forces. The estimation of the accuracy of the metal structure calculation is justified by solving several problems using the finite element method. The calculation error for various finite elements is determined.

Analysis on the Collision Couple between Drift Ice and Long-Span Prestressed Concrete T-Rigid Frame Bridge Pier

2015 ◽  
Vol 648 ◽  
pp. 17-24
Author(s):  
Jian Min Zhang ◽  
Zheng Guo Yuan ◽  
Ying Ping Wu
Keyword(s):  
Prestressed Concrete ◽  
Calculation Model ◽  
Bridge Pier ◽  
Long Span ◽  
Rigid Frame ◽  
Long Span Bridge ◽  
Cold Area ◽  
Collision Force ◽  
The Stability ◽  
Rigid Frame Bridge

Long-span bridge across the river in cold areas, is often impacted by the drift ice in spring, thus having some severe effects on the stability and vibration of the bridge structure. With a long-span prestressed concrete T-rigid frame bridge as studied object, based on the display analysis function of the LS-DYNA software, this paper represents the simulating process of the contact and collision between the drift-ice and T-rigid frame bridge pier, and the influence of various factors was analyzed, such as model boundary condition, contact types of river ice and pier, algorithm and element connection transition area. Thus the reasonable calculation model of the collision force caused by drift-ice to pier was determined. The result has important theoretical and practical value to ensure the safety of the bridge in cold area, as well as to reduce the project cost.

Seismic Response Analysis of Inclined Leg Rigid Frame Bridge Considering Soil-Pile Interaction

2011 ◽  
Vol 90-93 ◽  
pp. 1220-1223
Author(s):  
Chun Hui Zhang ◽  
Xing Jun Qi ◽  
Qi Hui Chen
Keyword(s):  
Seismic Response ◽  
Ground Motion ◽  
Dynamic Characteristics ◽  
Ground Motions ◽  
Three Dimensional ◽  
Element Model ◽  
Response Analysis ◽  
Rigid Frame ◽  
Pile Interaction ◽  
Rigid Frame Bridge

In this article, an inclined leg bridge is taken as the research object. The three-dimensional finite element model is established, and soil spring is used to simulate soil-pile interaction. The dynamic characteristics of the two models are calculated. Two different ground motions are selected to analyze seismic response of the bridge. The dynamic characteristics and seismic response of bridge are compared in the conditions whether considering soil-pile interaction. The results show that the stress and displacement under qian’an ground motion action is bigger than that under Elcentro ground motion because the two ground motions have different frequency characteristics .After considering soil-pile interaction, the natural frequencies of inclined leg bridge decrease, and the longitudinal displacement of bridge increases obviously, at the same time the stress in the top and bottom of inclined leg increase obviously and the stress among main girder is not obviously increased. Soil-pile interaction maybe cause some adverse effect for inclined leg rigid frame bridge.

Design and Test Analysis of Mid-and-Long Term Monitoring System for External Prestressed Continuous Rigid Frame Bridge

2013 ◽  
Vol 838-841 ◽  
pp. 1087-1091
Author(s):  
Xu Hui Hu ◽  
Ning Zhong ◽  
Shi Hong Jing
Keyword(s):  
Monitoring System ◽  
Prestressed Concrete ◽  
Element Model ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Cable Force ◽  
Long Term Monitoring ◽  
Rigid Frame Bridge ◽  
Term Monitoring

Study and design a set of economical and practical mid-and-long term monitoring system for long-span prestressed concrete continuous rigid frame bridge relying on the engineering of Xintan Qijiang Bridge in Chongqing. Master the static characteristics of such parameters as displacement, stress and external cable force during operation process of bridge through finite element model and make a comparative analysis of the relevant data after running for two years to test the feasibility and practicability of mid-and-long term monitoring system for continuous rigid frame bridge suggested in the paper.

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.

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