The Application of CAD Technology on the Design of Reinforced and Prestressed Counterforce Wall System

2011 ◽  
Vol 214 ◽  
pp. 397-401
Author(s):  
De Ling Wang ◽  
Jiang Hai Shen
Keyword(s):  
Complex System ◽  
Finite Element ◽  
Prestressed Concrete ◽  
Computer Aided Design ◽  
Limit State ◽  
Ultimate Limit State ◽  
Finite Element Program ◽  
Prestressing Steel ◽  
Design Program ◽  
Element Program

The counterforce wall and pedestral is a complex system. Computer aided design technology is used to design and analyze this reinforced and prestressed concrete structure. Firstly CAD design program is used to design a representative wall section as a separate component. It helps doing ultimate limit state calculation and serviceability limit state checking computation. The prestress on concrete induced by prestressing steel according to construction method is also computed. Secondly, a finite element program is used to analyze the whole system. The prestress computed by CAD design program is regarded as external load. Simulation technology is also described in this paper. The stress, strain and deformation of the whole prestressed system are calculated and checked. Moreover, dynamic structural analysis is done by finite element program. Then vibration frequencies and modes can be obtained. By combining CAD design with finite element program, this complex system can be designed reasonably and effectively.

Risk Analysis for the Construction Phases of Long-Span CFST Arch Bridge Based on Finite Element Analysis

2011 ◽  
Vol 225-226 ◽  
pp. 823-826
Author(s):  
Yu Feng Zhang ◽  
Guo Fu Sun
Keyword(s):  
Finite Element ◽  
Risk Analysis ◽  
Limit State ◽  
Ultimate Limit State ◽  
Element Analysis ◽  
Nonlinear Buckling ◽  
Finite Element Program ◽  
Arch Bridge ◽  
Cfst Arch Bridge ◽  
Element Program

As a part of virtual simulation of construction processes, this paper deals with the quantitative risk analysis for the construction phases of the CFST arch bridge. The main objectives of the study are to evaluate the risks by considering an ultimate limit state for the fracture of cable wires and to evaluate the risks for a limit state for the erection control during construction stages. Many researches have been evaluated the safety of constructed bridges, the uncertainties of construction phases have been ignored. This paper adopts the 3D finite element program ANSYS to establish the space model of CFST Arch Bridge, and to calculate the linear, the geometrical nonlinear and the double nonlinear buckling safety factors under the six different lode cases. Then the bridge’s risks are evaluated according to the results calculated which provide a reference for design of similar project.

On the Behavior and Design of Stiffened Plates in Ultimate Limit State

1978 ◽  
Vol 22 (04) ◽  
pp. 238-244
Author(s):  
T. H. Soreide ◽  
T. Moan ◽  
N.T. Nordsve
Keyword(s):  
Finite Element ◽  
Limit State ◽  
Axial Loading ◽  
Stiffened Plates ◽  
Ultimate Limit State ◽  
Element Formulation ◽  
Finite Element Program ◽  
Global Buckling ◽  
Element Program ◽  
Ultimate Limit

The behavior and design of stiffened plates in the ultimate limit state are studied. A finite element formulation for panel behavior considering general loading conditions, material properties, geometry, boundary conditions, and initial deflections is presented. Some results obtained by a finite element program are displayed and discussed. The problems considered comprise perfect and initially deflected plate-strips subjected to lateral pressure, single-span and two-span beam-columns under axial loading, and failure of a stiffened plate designed for simultaneous local and global buckling. Finally, design criteria are briefly discussed and recommendations for future work are given.

Finite Element Analysis of Natural Vibration Frequency for Unbounded Prestressed Concrete Beams

2013 ◽  
Vol 351-352 ◽  
pp. 1034-1037
Author(s):  
Feng Ge Li ◽  
Yan Zhao
Keyword(s):  
Finite Element ◽  
Vibration Frequency ◽  
Prestressed Concrete ◽  
Natural Vibration ◽  
Concrete Beams ◽  
Variable Stiffness ◽  
Natural Vibration Frequency ◽  
Element Analysis ◽  
Finite Element Program ◽  
Element Program

An experimental investigation on the dynamic characteristics of unbounded prestressed concrete simply support beams is presented. A total of 5 unbounded prestressed concrete simply support beams were constructed and tested. The influence of prestressing on natural vibration frequency of concrete beams is studied by applying prestress gradually. A model of variable stiffness is proposed to calculate the natural vibration frequency of unbounded prestressed concrete beams. The finite element program Sap2000 is used to calculate the frequency of unbounded prestressed concrete beams. The results show that the calculating results agree well with experimental ones.

scholarly journals Comparison between Experimental and 3D Finite Element Analysis of Reinforced and Partially Pre-Stressed Concrete Solid Beams Subjected to Combined Load of Bending, Torsion and Shear

2008 ◽  
Vol 5 (1) ◽  
pp. 79
Author(s):  
A. S. Alnuaimi
Keyword(s):  
Finite Element ◽  
Prestressed Concrete ◽  
Failure Load ◽  
Element Analysis ◽  
Finite Element Program ◽  
3D Finite Element ◽  
Combined Load ◽  
Perfectly Plastic ◽  
Non Linear ◽  
Element Program

This paper presents a non-linear analysis of three reinforced and two partially prestressed concrete solid beams based on a 20 node isoparametric element using an in-house 3D finite element program. Anon linear elastic isotropic model, proposed by Kotsovos, was used to model concrete behaviour, while steel was modelled as an embedded element exhibiting elastic-perfectly plastic response. Allowance was made for shear retention and for tension stiffening in concrete after cracking. Only in a fixed direction, smeared cracking modelling was adopted. The beams dimensions were 300x300 mm cross section, 3800 mm length and were subjected to combined bending, torsion and shear. Experimental results were compared with the non-linear predictions. The comparison was judged by load displacement relationship, steel strain, angle of twist, failure load, crack pattern and mode of failure. Good agreement was observed between the predicted ultimate load and the experimentally measured loads. It was concluded that the present program can confidently be used to predict the behaviour and failure load of reinforced and partially prestressed concrete solid beams subjected to a combined load of bending, torsion and shear. 

Asymmetric of Continuous Rigid Frame Bridge Precamber and Construction

2013 ◽  
Vol 361-363 ◽  
pp. 1228-1231
Author(s):  
Wan Quan Tong
Keyword(s):  
Finite Element ◽  
Prestressed Concrete ◽  
Bridge Structure ◽  
Construction Process ◽  
Finite Element Program ◽  
Expansion Joints ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Element Program ◽  
Rigid Frame Bridge

Prestressed concrete continuous rigid frame bridge has the advantages of no expansion joints, smooth driving the advantages,however, due to cross under serious scratch,seriously affect the service life of the bridge.Take a Large span asymmetric continuous rigid frame bridge of Guizhou as engineering background,use finite element Program Midas/Civil modeling,carried out Analysis of the construction process,And select a reasonable way to Set the bridge pre-camber,and provide reasonable data for the construction of control,to ensure the bridge structure linear reasonable.

3-D Numerical Analysis on Performance of Prestressed and Precast Concrete Segment Joint

2011 ◽  
Vol 255-260 ◽  
pp. 1853-1856 ◽  
Author(s):  
Feng Jun Liu ◽  
Lei Xie ◽  
He Hua Zhu ◽  
Ning Yu
Keyword(s):  
Numerical Analysis ◽  
Prestressed Concrete ◽  
Precast Concrete ◽  
Friction Model ◽  
Concrete Lining ◽  
Stick Slip ◽  
Finite Element Program ◽  
Rotational Angle ◽  
Prestressing Steel ◽  
Element Program

The rotational angle of joint is the key factor for segment lining design. Using the nonlinear finite element program of MARC (MSC2003), the 3D numerical analysis on segment joint of prestressed concrete lining has been carried out. During the analysis, Coulomb and Stick-slip friction models were used as the friction type between the concrete and the prestressing steel strands. The selection of friction model used in the numerical analysis is very important. The study showed that the Stick-slip friction model is more suitable than Coulomb friction model for analysis of the P&PCSL joint. The value of friction coefficient should be thought over carefully.

Finite-Element Analysis of Prestressed Concrete Frame Joints with Spread-Ended Beams

2014 ◽  
Vol 638-640 ◽  
pp. 115-119
Author(s):  
Qing Wen Liu ◽  
Fu Qiang Wu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Shear Strength ◽  
Prestressed Concrete ◽  
Model Experiment ◽  
Core Region ◽  
Element Analysis ◽  
Finite Element Program ◽  
Concrete Frame ◽  
Element Program

On the basis of the joint model experiment, the non-linear performance of joints is analysed by using finite element program. The concrete stress distribution, stirrups stress and dangerous area of joints with spread-ended beams are discussed. Finite element analysis shows that effective prestressing tendons through the joint core region play a beneficial role in concrete and can improve the compressive strengths of concrete, and help to improve the shear strength of joints. Finally, according to experiments and theoretical analysis, the beginning of the haunched region is the dangerous area of joint. In order to avoid concrete tension failure when exerting prestress, the beginning of the haunched region must have enough transverse U-shaped bars to resist the prestressing tension.

scholarly journals Effect of Water Condensate on Corrosion of Wires in Ungrouted Ducts

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7765
Author(s):  
Radoslav Ponechal ◽  
Peter Koteš ◽  
Daniela Michálková ◽  
Jakub Kraľovanec ◽  
František Bahleda
Keyword(s):  
Prestressed Concrete ◽  
Steel Wire ◽  
Limit State ◽  
Concrete Structures ◽  
Concrete Bridges ◽  
The Other ◽  
Actual State ◽  
Ultimate Limit State ◽  
Cross Sectional ◽  
Prestressing Steel

In the case of existing prestressed concrete structures, information about the actual state of prestressing is an important basis for determining their load-carrying capacity, as well as remaining service lifetime. This is even more important in the case of existing prestressed concrete bridges, which are exposed to a more aggressive environment than the other prestressed concrete structures. The level of prestressing is affected and reduced by prestress losses at a given time. In calculating the internal forces and stresses, required for the assessment of the Ultimate Limit State and the Serviceability Limit State, it is necessary to know not only the prestressing level but also the cross-sectional area of the prestressing steel (wire, strand or cable), which can change in time due to corrosion. In practice, in the case of the pre-tensioned concrete members, it has often happened in the past that cable ducts have been grouted only partially, or not at all, due to poor grouting technology. Experts did not realize what this could cause in the future—the penetration of water with aggressive agents directly into the cable duct and consequently corrosion of the prestressing steel, which means not increased protection of the steel, but rather acceleration of degradation. On the other hand, in many cases, corrosion also occurs in ducts that are not grouted and no water has entered them. This paper deals with this phenomenon—the formation of corrosion of prestressing steel in cable ducts in ungrouted ducts due to moisture. This problem was investigated experimentally and numerically in the simulation program ESP-r. Experimental measurements and numerical simulations have shown that the water vapor condenses in the cable ducts, which can subsequently cause corrosion of the prestressing steel.

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