scholarly journals Effect of Shear Creep on Long-Term Deformation Analysis of Long-Span Concrete Girder Bridge

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Yanwei Niu ◽  
Yingying Tang
Keyword(s):  
Superposition Principle ◽  
Three Dimensional ◽  
Deformation Analysis ◽  
Computation Method ◽  
Shear Creep ◽  
Long Span ◽  
Continuous Girder Bridge ◽  
Girder Bridge ◽  
Concrete Girder

The purpose of this paper is to report on the development of a three-dimensional (3D) creep calculation method suited for use in analyzing long-term deformation of long-span concrete girder bridges. Based on linear creep and the superposition principle, the proposed method can consider both shear creep and segmental multiage concrete effect, and a related program is developed. The effects of shear creep are introduced by applying this method to a continuous girder bridge with a main span of 100 m. Comparisons obtained with the nonshear case show that shear creep causes long-term deformation to increase by 12.5%. Furthermore, the effect of shear creep is proportional to the shear creep coefficient; for a bridge with different degrees of prestress, the influence of shear creep is close. Combined with the analysis of a continuous rigid bridge with a main span of 270 m, the results based on the general frame program suggest that shear creep amplification is multiplied by a factor of 1.13–1.15 in terms of long-term deformation. Moreover, the vertical prestress has little effect on shear creep and long-term deformation. The 3D creep analysis shows a larger long-term prestress loss for vertical prestress at a region near the pier cross section. The relevant computation method and result can be referenced for the design and long-term deformation analysis of similar bridges.

Effect of Shear Lag on the Long-Term Performance of Long-Span PC Box Girder Bridge

2011 ◽  
Vol 255-260 ◽  
pp. 1290-1294 ◽  
Author(s):  
Yan Wei Niu
Keyword(s):  
Prestressed Concrete ◽  
Three Dimensional ◽  
3D Analysis ◽  
Shear Lag ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Girder Bridges ◽  
Long Span ◽  
Girder Bridge

The analysis and mechanism of excessive long-term deflection of long-span prestressed concrete (PC) box girder bridges is concentrated recently. However, because of the lack of computing method, three dimensional (3D) analysis of PC continuous bridge especially including long-term shear lag effect is hard to analyze. According to this, a 3D creep analysis method for long-span PC bridges is illustrated in this paper first. The shear lag analysis of loads, prestress and their combination effect is carried out respectively. Based on this, the effect of shear lag to the long-term deflection of mid-span and whole-shape of the bridge is demonstrated. At the end, the different of computing between analysis with or without considering shear lag is discussed and some suggestion is proposed.

IMPACTS OF PRE-STRESS LOSS ON THE LONG-TERM DEFLECTION FOR LONG-SPAN PC CONTINUOUS GIRDER BRIDGE

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Jianqing Bu ◽  
Jincan Cui
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Analysis Software ◽  
Element Analysis ◽  
Girder Bridges ◽  
Long Span ◽  
The Finite Element Analysis ◽  
Continuous Girder Bridge ◽  
Girder Bridge

In order to analyze the impacts of pre-stress loss on the long-term deflection for long-span PC continuous girder bridges, this paper presents a numerical analysis using the finite element analysis software MIDAS/Civil based on a long-span PC continuous box-section girder bridge in Shijiazhuang. Once the 3-D finite element model was established, the influences of different pre-stress loss levels and locations were analyzed in a numerical simulation. Pre-stress loss is often the key reason for long-term deflection in long-span PC continuous girder bridges, so we can estimate the development of deflection by considering these factors during the operation.

scholarly journals High-Speed Train-Track-Bridge Dynamic Interaction considering Wheel-Rail Contact Nonlinearity due to Wheel Hollow Wear

2019 ◽  
Vol 2019 ◽  
pp. 1-18 ◽  
Author(s):  
Chao Chang ◽  
Liang Ling ◽  
Zhaoling Han ◽  
Kaiyun Wang ◽  
Wanming Zhai
Keyword(s):  
High Speed ◽  
Synthesis Method ◽  
Dynamic Interaction ◽  
High Speed Train ◽  
Train Track ◽  
High Speed Railway ◽  
Long Span ◽  
Continuous Girder Bridge ◽  
Girder Bridge ◽  
Track Bridge

Wheel hollow wear is a common form of wheel-surface damage in high-speed trains, which is of great concern and a potential threat to the service performance and safety of the high-speed railway system. At the same time, rail corridors in high-speed railways are extensively straightened through the addition of bridges. However, only few studies paid attention to the influence of wheel-profile wear on the train-track-bridge dynamic interaction. This paper reports a study of the high-speed train-track-bridge dynamic interactions under new and hollow worn wheel profiles. A nonlinear rigid-flexible coupled model of a Chinese high-speed train travelling on nonballasted tracks supported by a long-span continuous girder bridge is formulated. This modelling is based on the train-track-bridge interaction theory, the wheel-rail nonelliptical multipoint contact theory, and the modified Craig–Bampton modal synthesis method. The effects of wheel-rail nonlinearity caused by the wheel hollow wear are fully considered. The proposed model is applied to predict the vertical and lateral dynamic responses of the high-speed train-track-bridge system under new and worn wheel profiles, in which a high-speed train passing through a long-span continuous girder bridge at a speed of 350 km/h is considered. The numerical results show that the wheel hollow wear changes the geometric parameters of the wheel-rail contact and then deteriorates the train-track-bridge interactions. The worn wheels can increase the vibration response of the high-speed railway bridges.

Dynamic Response of Bridge Girder and Shear Keys Subjected to Pounding during Earthquakes

2013 ◽  
Vol 339 ◽  
pp. 515-519
Author(s):  
Lu He ◽  
Lu Zhang ◽  
Jia Yong Chen ◽  
Chu Dong Pan ◽  
Yu Xiang Liu
Keyword(s):  
Dynamic Response ◽  
Three Dimensional ◽  
The Finite Element Method ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Movement Characteristics ◽  
Shear Keys ◽  
Continuous Girder Bridge ◽  
Bridge Girder ◽  
Girder Bridge

Shear keys have been widely used to control the damage in abutments and piles during earthquakes. To investigate the dynamic response of bridge girder and traverse shear keys subjected to pounding, a three dimensional model of continuous girder bridge is developed in this study. With the assistance of the finite element method program ANSYS and the package LS-DYNA, the pounding between bridge girder and shear keys is simulated. Subsequently, the stress and displacement responses of the model are analyzed, and the movement characteristics are presented.

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