The Experimental and Theoretical Research on Creep Effect of Large Prestressed Concrete Box Girder

2014 ◽  
Vol 501-504 ◽  
pp. 1199-1203 ◽  
Author(s):  
Ji Xin Yang ◽  
Pei Liu ◽  
Ming Chao Yang
Keyword(s):  
Influencing Factors ◽  
Prestressed Concrete ◽  
Complex Structure ◽  
Internal Force ◽  
Deformation Monitoring ◽  
Theoretical Research ◽  
Box Girder ◽  
Concrete Creep ◽  
Finite Element Software ◽  
Creep Effect

The concrete creep effect is a peculiar phenomenon of concrete material, it has a significant effect on the deformation and internal force redistribution of concrete member, besides, it may cause the loss of prestress , it may have serious consequences especially on complex structure such as long-span bridges. So it must be considered in bridge design and construction. Based on the subject of CYSG deformation monitoring and 32m precast PC simply supported box girder, the method of creep test has been researched and determined in this paper firstly, then the laws of the development of the creep has been summarized, and the influencing factors of concrete creep has been concluded. Using the finite element software ANSYS and the APDL language, theoretical analysis of creep has been carried on in this paper. In conclusion, This paper analyzed the influencing factors of concrete creep and provided the basis for long-term deformation control of creep by comparing the theoretical results with the experimental data.

Creep Stress Analysis of PC Composed Box Girder Bridge with Corrugated Steel Webs

2010 ◽  
Vol 163-167 ◽  
pp. 1987-1990
Author(s):  
Cheng Lin Shan ◽  
Ling Yan
Keyword(s):  
Prestressed Concrete ◽  
Internal Force ◽  
Stress Redistribution ◽  
Compatibility Equation ◽  
Box Girder ◽  
Concrete Creep ◽  
Creep Stress ◽  
Girder Bridge ◽  
Prestressed Concrete Girder Bridge ◽  
Bottom Slab

According to the forced load-bearing characteristics of the prestressed concrete girder bridge with corrugated steel webs, the cross-section internal forces and stress redistribution of box-girder were studied under the influence of concrete creep. And the internal force redistribution formula on concrete creep was derived through the establishment of the compatibility equation of bending deformation; the stress redistribution formulas of the top slab and the bottom slab of box-girder at any time were also derived, through the establishment of the compatibility equation of the axial displacement and angular deformation of the top slab and the bottom slab of box-girder under the influence of concrete creep at any time. These show that the creep stress is only related to the box height and it’s the geometric properties of top slab and bottom slab concrete section, but not to the steel web’s size.

Finite Element Analysis on Incremental Launching Construction for Steel Box Girder

2013 ◽  
Vol 671-674 ◽  
pp. 974-979
Author(s):  
Jie Dai ◽  
Jin Di ◽  
Feng Jiang Qin ◽  
Min Zhao ◽  
Wen Ru Lu
Keyword(s):  
Finite Element ◽  
Bending Moment ◽  
Internal Force ◽  
Element Analysis ◽  
Box Girder ◽  
Finite Element Software ◽  
Cable Stayed Bridge ◽  
Steel Box Girder ◽  
Maximum Value ◽  
Negative Bending

For steel box girder of cable-stayed bridge, which using incremental launching method, during the launching process, structural system and boundary conditions were changing, structure mechanical behaviors were complex. It was necessary to conduct a comprehensive analysis on internal force and deformation of the whole structure during the launching process. Took a cable-stayed bridge with single tower, double cable planes and steel box girder in China as an example; finite element software MIDAS Civil 2010 was used to establish a model for steel box girder, simulation analysis of the entire incremental launching process was carried out. Variation rules and envelopes of the internal force, stress, deformation and support reaction were obtained. The result showed that: the maximum value of positive bending moment after launching complete was 60% of the maximum value of positive bending moment during the launching process. The maximum value of negative bending moment after launching complete was 78% of the maximum value of negative bending moment during the launching process.

Behaviour Analysis of Prestressed Concrete Deck-Tied Arch Bridge

2013 ◽  
Vol 671-674 ◽  
pp. 952-956 ◽  
Author(s):  
Yi Qiang Xiang ◽  
Li Chang Zhang ◽  
Qiang Qiang Wu
Keyword(s):  
Prestressed Concrete ◽  
Internal Force ◽  
Analysis Model ◽  
Box Girder ◽  
Arch Bridge ◽  
Long Span ◽  
Prestressing Force ◽  
Horizontal Thrust ◽  
Tied Arch Bridge ◽  
Concrete Deck

The prestressed concrete deck-tied arch bridge doesn’t only have a long span, good appearance and economy, but also have the characteristics of low requirements to the foundation. It changes traditional tied arch bridge into deck-tied arch bridge, which looks like sunflower-shaped arch and prestressed steel strands are embedded in box girder on the top of the arch. Taking Yingbin Bridge as engineering background, the reasonable analysis model was established and behaviour of the bridge under design load was analyzed. The results shown that the design project is reasonable, prestressing force embedded in box girder can balance horizontal thrust in arch bridge effectively, improving the internal force of the main arch ring.

The Nonlinear Finite Element Analysis of Prestressed Concrete Box Girder

2013 ◽  
Vol 361-363 ◽  
pp. 1384-1388
Author(s):  
Meng Chan Zhou ◽  
Qun Yang Liu ◽  
Jun Su
Keyword(s):  
Finite Element ◽  
Prestressed Concrete ◽  
Maximum Stress ◽  
Nonlinear Finite Element ◽  
Structure Model ◽  
Construction Process ◽  
Element Analysis ◽  
Box Girder ◽  
Finite Element Software ◽  
Control Section

Using Midas/Civil, a nonlinear finite element software, to establish solid element, analyse the process of the construction of a prestressed concrete simply supported box girder which length 32m, this box girder is located on the Shijiazhuang-Wuhan Passenger Dedicated Line, gained the maximum stress and displacement at the control section. Comparative analysis of the simulation results with the monitoring data which gained at the construction site, The results of both are substantially the same, achieve the purpose of assessing the safety of the construction process and the reasonableness of the structure model about the box girder.

scholarly journals Study on Design of Concrete Box Girder of A Railway Swivel Cable-Stayed Bridge

2021 ◽  
Vol 237 ◽  
pp. 03026
Author(s):  
Yang Liu ◽  
Tenghui Ding ◽  
Qinyun Xie ◽  
Guangli Xu ◽  
Chao Li
Keyword(s):  
Prestressed Concrete ◽  
Mechanical Performance ◽  
Dead Weight ◽  
Box Girder ◽  
Finite Element Software ◽  
Cable Stayed Bridge ◽  
Floating System ◽  
Concrete Box Girder ◽  
The Dead ◽  
Spherical Hinge

A swivel cable-stayed bridge over the existing railway is a span across the existing railway. The recommended scheme for the main bridge is (128 + 388 + 128) m steel mixed composite beam swivel diagonal pull bridge with span. The cables of the diagonal pull bridge are arranged according to the fanshaped central double cable plane, taking into account the mechanical performance and aesthetics. The bridge structure adopts semi floating system. The concrete swivel diagonal pull bridge is adopted in the comparison scheme. The design of the bridge is three spans and (138 + 268 + 138) m prestressed concrete box girder is adopted. The cables are arranged according to the central double cable plane, and the bridge composition adopts the consolidation system. Considering the needs of bridge operation and maintenance in the later stage of the bridge, when the dead weight of concrete diagonal pull bridge is within the ideal range, the concrete swivel diagonal pull bridge can be preferred. In order to calculate the dead weight of the selected bridge, the author uses the finite element software to model the whole bridge and calculate the weight of the bridge. The results show that the dead weight of the concrete swivel diagonal pull bridge is too large, which has exceeded the maximum bearing capacity of the existing spherical hinge. In order to continue to use the concrete swivel diagonal pull bridge scheme, it is necessary to optimize the design of the concrete swivel diagonal pull bridge scheme.

Research on the Installation Lengths of Zero Block Concrete Segment in Prestressed Concrete Box-Girder Beams with Corrugated Steel Webs

2011 ◽  
Vol 255-260 ◽  
pp. 1147-1153
Author(s):  
Pin Zhao ◽  
Jian Shu Ye
Keyword(s):  
Prestressed Concrete ◽  
Relevant Information ◽  
Box Girder ◽  
Structure Control ◽  
Finite Element Software ◽  
Internal Forces ◽  
Length Changes ◽  
Concrete Box Girder ◽  
The Impact ◽  
Block Concrete

In order to study the reasonable installation lengths of zero block concrete segment in prestressed concrete box-girder beams with corrugated steel webs, a numerical analysis on the length of different zero blocks in PC box girder beams with corrugated steel webs is made by the finite element software ANSYS. The influence of the installation lengths of zero block concrete segment on the structure control section's internal forces and deformation is discussed. The results indicate: the impact of length changes of zero block on box girder deflection is greater than its impact on internal forces; in terms of deflection, the displacement influence in quarter-section in middle span is the largest; and in terms of internal forces, the internal forces influence of the junction section formed by zero block concrete segment and beam segment with corrugated steel webs is the largest. According to the above results and the relevant information of constructed bridges, the reasonable setting length of zero block concrete segment has been provided, that the ratio L0/L of installation lengths and span for zero block of box girder should be in the range of 0.05 to 0.10.

Research on Wind-Resistant Capability of Two Common Section Forms for Long Span Bridges

2013 ◽  
Vol 438-439 ◽  
pp. 930-934
Author(s):  
Jia Li Xie ◽  
Cun Ming Ma ◽  
Chun Xu Lei ◽  
Qing Song Duan
Keyword(s):  
Structural Models ◽  
Internal Force ◽  
Main Section ◽  
Box Girder ◽  
Long Span Bridges ◽  
Finite Element Software ◽  
Long Span ◽  
Steel Box Girder ◽  
Section Design ◽  
Closed Steel

Long span bridges have two main section forms including streamlined closed steel box girder and twin steel box girder. In order to compare the wind-resistant capacity, the finite element software ANSYS is adopted to establish the calculation structural models of Third Bosphorus Bridge respectively with two kinds of sections in the same width. According to the analysis of the wind-induced internal force and the flutter stability, the respective advantages of the two section forms in terms of wind-resistant capability are discussed. The analysis results could be used as reference in the section design of long span bridges.

Design Analysis of Unbonded Prestressed Concrete Two-Way Slab

2012 ◽  
Vol 204-208 ◽  
pp. 853-856
Author(s):  
Jia Sheng Liu
Keyword(s):  
Finite Element ◽  
Prestressed Concrete ◽  
Material Selection ◽  
Concrete Slab ◽  
Internal Force ◽  
Element Analysis ◽  
Finite Element Software ◽  
Linear Load ◽  
Standard Value ◽  
Force Calculation

Through some engineering example, the finite element software SAP2000N is used to make a finite element analysis on the prestressed concrete slab, which is made of concrete with grade of C40, low relaxation PC strand wile with tensile strength standard value of 1860N/mm2and nonprestressed reinforcements with grade of HRB335. By doing this, the author systematically introduced the material selection, prestressing technique and linear, load values and internal force calculation, distribution of prestressed tendons and nonprestressed reinforcement, the design process of crack and deformation of cast-in-site prestressed concrete two-way slab.

SHRINKAGE AND CREEP EFFECT ANALYSES OF DOUBLE COMPOSITE CONTINUOUS BOX-GIRDER BRIDGE CONSTRUCTED BY PRE-JACKING METHOD

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Shujin Duan ◽  
Bin Wang ◽  
Yuanyuan Wang ◽  
Runming Niu
Keyword(s):  
Composite Beam ◽  
Concrete Slab ◽  
Bridge Construction ◽  
Creep Equation ◽  
Box Girder ◽  
Concrete Creep ◽  
Creep Effect ◽  
Shrinkage And Creep ◽  
Negative Moment ◽  
Girder Bridge

Continuous double steel and concrete composite beam is a new structural system developed on the basis of common steel and concrete composite beam. Controlling concrete slab crack width in a continuous double composite beam is a significant content in the bridge construction process. Jacking-up and landing bearing supports method is applied to a double composite girder bridge construction and its structural mechanical behaviors in the whole process will be simulated. By using of User Programmable Features and ANSYS Parametric Design Language, the commercial FEM software ANSYS was further developed. The exponential model of concrete creep and the implicit solution of concrete creep equation under the action of variable stress were introduced into ANSYS, to realize the concrete shrinkage and creep effect analysis of double composite continuous box-girder bridges constructed by pre-jacking method. The results show that it is improved that the stress state of the top concrete slab in the negative moment regions by pre-jacking method. Due to the effect of concrete creep, the concrete creep will cause tensile stress in the negative moment regions of the composite beam, which will reduce the compressive stress in the top concrete slab. The effect of prestressing is greatly affected by pre-jacking value, and the creep of the concrete also causes the stress redistribution of the concrete and the steel beam.

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