Influence of Construction Procedures on the Liner and Stress of a PC Continuous Beam Bridge

2010 ◽  
Vol 121-122 ◽  
pp. 162-167
Author(s):  
Hu Cheng ◽  
Guo Xuan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Test Data ◽  
Significant Influence ◽  
Continuous Beam ◽  
Element Analysis ◽  
Continuous Beam Bridge ◽  
Cantilever Construction ◽  
Beam Bridge

During the construction of a bridge, the construction procedures may change from the originally designed procedures due to some reasons like the weather. In this paper, the influence of construction procedures on the liner and stress is investigated for a prestressed continuous beam bridge with three spans. Finite element analysis indicated that construction procedures have great impact on the liner control and they affect the middle span and side span differently. Although different sets of construction procedures cause different stress at corresponding construction stages after the cantilever construction is finished, they have no significant influence on the stress of the finally built bridge. Test data agreed with finite element analysis. It is thus the influence of construction procedures on bridge liner control should not be neglected.

Development of a New, Correlated FEA Method of Assessing Mooring Chain Fatigue

2019 ◽  
Author(s):  
Gary H. Farrow ◽  
Andrew E. Potts ◽  
Andrew A. Kilner ◽  
Phillip P. Kurts ◽  
Simon Dimopoulos ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Fatigue Test ◽  
Test Data ◽  
Linear Chain ◽  
Element Analysis ◽  
Chain Link ◽  
Non Linear ◽  
Mooring Chain

Abstract The first phase of the Chain FEARS (Finite Element Analysis of Residual Strength) Joint Industry Project (JIP) aimed to develop guidance for the determination of a rational discard criteria for mooring chains subject to severe pitting corrosion which, based on current code requirements, would otherwise require immediate removal and replacement. Critical to the ability to evaluate the residual fatigue life of a degraded chain, is to have an accurate estimate of the chain in its as-new condition, thereby providing a benchmark for any loss in fatigue life associated with severe corrosion or wear. A large collection of fatigue test data was collated for comparison and to establish underlying trends in as-new mooring chain fatigue response. A non-linear multi-axial Finite Element Analysis (FEA) fatigue assessment method was developed to correlate against available as-new chain link fatigue test data and underlying failure trends as part of the JIP achieving this critical requirement. It was established that the linear FEA fatigue method currently employed in the industry is too simplistic and does not correlate with the fatigue test data, whereas an alternative method of assessing fatigue based on FEA, developed with respect to the DNV B1 material curve, correlates well with the available physical fatigue test data. The FEA method uses a non-linear chain link FEA and multi-axial stress fatigue calculation method to determine an equivalent Stress Magnification Factor (SMF). This method achieves good correlation of predicted utilisations and associated cycles-to-failure with fatigue test data and in respect of critical locations with evidenced failure locations. The method of equivalent SMF calculation accounted for the significant effects on fatigue performance including proof load induced residual stress, mean stress levels and the increase in material fatigue endurance associated with increased steel UTS (i.e. increased offshore mooring chain grade). The analytical method developed in this study achieved a high degree of correlation with as-new chain fatigue test data, and should enable the accurate prediction of fatigue stresses around a link and in particular for irregular geometry associated with corrosion degraded chain links.

Construction Monitoring of Prestressed Concrete Continuous Beam Bridge

2014 ◽  
Vol 919-921 ◽  
pp. 308-312
Author(s):  
Cong Qi Li ◽  
Wen Jie Ge ◽  
Da Fu Cao ◽  
Bi Yuan Wang
Keyword(s):  
Prestressed Concrete ◽  
Beam Deflection ◽  
Practical Significance ◽  
Continuous Beam ◽  
Construction Monitoring ◽  
Long Span Bridges ◽  
Box Beam ◽  
Continuous Beam Bridge ◽  
Cantilever Construction ◽  
Beam Bridge

The creep of concrete structure has a prodigious effect on bridge alignments and the stress control during the bridge construction. In the meantime, the problems such as pre-stress losses, bearing asymmetry sink ,the concrete box-beam deflection, box-beam web cracks, structure stress redistributing and so on, which make the bridge structure lose functions or even invalid early when it works. For these reasons, the construction monitor of the deformation and the long-term deflection of long-span bridges with high piers have important practical significance. Construction monitoring of prestressed concrete continuous beam bridge - new Tongyang canal bridge which adopt cantilever construction work is made.

Investigations Into Fatigue Performance of Offshore Mooring Chains

2017 ◽  
Author(s):  
Gary H. Farrow ◽  
Andrew E. Potts ◽  
Daniel G. Washington
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Fatigue Test ◽  
Test Data ◽  
Assessment Method ◽  
Accurate Estimate ◽  
Element Analysis ◽  
Factors Influencing ◽  
Non Linear

The Chain Finite Element Analysis of Residual Strength Joint Industry Project (Chain FEARS JIP) aimed to develop guidance for the determination of a rational discard criteria for mooring chains subject to severe pitting corrosion which would otherwise require immediate removal and replacement. Critical to the ability to evaluate the residual fatigue life of a degraded chain, is to have an accurate estimate of the chain in its as-new condition, thereby providing a benchmark for any loss in fatigue life associated with severe corrosion or wear. A non-linear multi-axial Finite Element Analysis (FEA) fatigue assessment method was developed and correlated against available fatigue test data as part of the JIP achieving this critical requirement. The development of this correlated methodology necessitated a review of: • The available mooring chain fatigue test data, to identify the factors influencing chain fatigue life and failure location. • FEA fatigue methodologies currently employed in the industry. • Current Class Rules relating to fatigue estimation. • The influence of material, manufacturing and operational factors on chain fatigue life. It was established that while the linear FEA fatigue method currently employed in the industry does not correlate with the fatigue test data, the non-linear multi-axial FEA fatigue method developed in the JIP afforded good correlation with test data. It was also demonstrated that the magnitude of mean chain tension and inconsistency in proof loading, as a consequence of the inconsistency in Class Minimum Break Load (MBL) specification, and with respect to chain size and the varying material ductility of steel grades, effects fatigue life. The identified inconsistency in the proofing indicates a likely inconsistency in conservatism embodied in the Class Rules fatigue formulation. Consequently it is possible that chains of certain size and grade may have significantly less fatigue life than anticipated by Class. Further work is recommended to establish a more rational proof load specification and to develop an alternative Class Rules fatigue formulation accounting for the identified factors influencing fatigue.

Stress Distribution in Reverse-Bent Bonded Joint

2012 ◽  
Vol 236-237 ◽  
pp. 48-51
Author(s):  
Yong Tang ◽  
Xiao Cong He ◽  
Jun Chao Zheng ◽  
Kai Zeng ◽  
Yan Fang Ding ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Concentration ◽  
Stress Distribution ◽  
Significant Influence ◽  
Element Analysis ◽  
Joint Performance ◽  
Best Value ◽  
Bonded Joint ◽  
Bonding Technology

Adhesively bonding technology is used increasingly by the automotive and aerospace industries. The design of reverse-bent joint is effective way for improving the bonded joint performance. The influence of preformed angle on the stress distribution of the adhesive-adherend interface is studied in this paper using finite element analysis (FEA). By comparing the results of the FEA for reverse-bent joints with different preformed angle, it can be seen that the preformed angle not only have significant influence on the stress distribution of overlap section, but also changes stress concentration at the spew fillet of bonded joint. The results also indicate that there is a best value of preformed angle in which the reverse-bent bonded joint has the best performance.

Spatial Effects and Broken-up Analysis for Bottom Plates of Box Girders in a Large Span Rigid Frame - Continuous Beam Bridge

2012 ◽  
Vol 178-181 ◽  
pp. 2268-2272
Author(s):  
Xin Dai Zuo ◽  
Zhao Le Qu ◽  
Bin Ge
Keyword(s):  
Finite Element ◽  
Cross Sections ◽  
Spatial Effects ◽  
Continuous Beam ◽  
Box Girders ◽  
Transverse Tensile ◽  
Continuous Beam Bridge ◽  
Rigid Frame ◽  
Radial Forces ◽  
Beam Bridge

The author took a rigid frame-continuous beam bridge for example, analyzed by means of plane finite element and space finite element methods. In the space model, corrugated pipes were built in order to consider the weaken effects to cross-sections. Aimed at the least well stage which is after prestressing and before grouting, spatial stresses were indicated. Final results indicate exceeded transverse tensile stresses caused by radial forces are the most important factor which led to bursting cracks.

scholarly journals Filling Simple Holes of Triangular Mesh by using Enhanced Advancing Front Mesh (EAFM) method

2018 ◽  
Vol 7 (2.15) ◽  
pp. 81
Author(s):  
Noorehan Awang ◽  
Rahmita Wirza Rahmat ◽  
Puteri Suhaiza Sulaiman ◽  
Azmi Jaafar ◽  
Ng Seng Beng
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Test Data ◽  
3D Models ◽  
Triangular Mesh ◽  
Triangular Meshes ◽  
Element Analysis ◽  
Advancing Front ◽  
Data Function

Triangular meshes are extensively used to represent 3D models. Some surfaces cannot be digitised due to various reasons such as inadequacy of the scanner, and this generally occurs for glossy, hollow surfaces and dark-coloured surfaces. This cause triangular meshes to contain holes and it becomes difficult for numerous successive operations such as model prototyping, model rebuilding, and finite element analysis. Hence, it is necessary to fill these holes in a practical manner. In this paper, the Enhanced Advancing Front Mesh (EAFM) method was introduced for recovering missing simple holes in an object. The first step in this research was to extract the feature vertices around a hole on a 3D test data function. Then the Advancing Front Mesh (AFM) method was used to fill the holes. When conflicts occurred during construction of the triangle, the EAFM method was introduced to enhance the method. The results of the study show that the enhanced method is simple, efficient and suitable for dealing with simple hole problems.  

Hydrodynamic Coefficient Maps for Riser Interference Analysis

2015 ◽  
Author(s):  
Suneel Patel ◽  
Shankar Sundararaman ◽  
Pete Padelopoulos ◽  
Kamaldev Raghavan ◽  
Metin Karayaka ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Test Data ◽  
Lift Coefficient ◽  
Circular Cylinders ◽  
Scale Model ◽  
System Response ◽  
Interference Analysis ◽  
Element Analysis ◽  
Viv Suppression

Riser wake interference analysis is conducted based on analytical / semi-empirical models such as Blevins’ and Huse’s models. These models are used for modeling the reduction in particle flow velocity due to the presence of a cylindrical object upstream in the flow path. However, these models are often too conservative and accurate only for circular cylinders. Many top tensioned risers (TTRs) use vortex induced vibration (VIV) suppression devices such as strakes or fairings. There is a need for alternate methods to obtain drag and lift coefficient datasets for circular cylinders with strakes and fairings. Two such approaches are to obtain data from Computational Fluid Dynamics (CFD) simulations or from experimental large-scale model test data. Interpolation and/or extrapolation methods are needed to obtain additional data points for global riser finite element analysis. This paper presents a methodology to obtain hydrodynamic coefficients for TTRs with VIV suppression devices. The proposed methodology uses a combination of empirical formulas based on Blevins’ model and numerical interpolation techniques along with experimental tow tank test data and CFD analysis. The resulting data is then input as user-defined drag/lift coefficients into a global riser finite element analysis to obtain a more realistic riser system response.

Test and Finite Element Analysis of Concrete Continuous Beams Strengthened with CFRP Sheets

2010 ◽  
Vol 163-167 ◽  
pp. 998-1004 ◽  
Author(s):  
Dong Hui Cheng ◽  
Ya Min Yi ◽  
Tian Feng Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Test Data ◽  
Internal Force ◽  
Plastic State ◽  
Element Analysis ◽  
Cfrp Sheets ◽  
Continuous Beams ◽  
The Finite Element Analysis ◽  
Control Section

In order to study the mechanical behavior on concrete continuous beams strengthened with CFRP sheets, three two-span continuous beams strengthened with CFRP sheets in the control section at each span were fabricated and tested with two-point loading type. The test data such as load, crack distribution and deformation were obtained in different stages. Based on the test data, the finite element analysis on the continuous beams strengthened with CFRP sheets was carried out by ANSYS software. The variation of steel stress and deflection of control section in the intermediate support and the bearing capacity in different stages were obtained, moreover, the results show that the ultimate strength of continuous beams strengthened with CFRP sheets has not improved largely in elastic state while increased significantly in plastic state, and the continuous beams displayed obviously internal force redistribution.

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