scholarly journals Finite-Element Model for Pretensioned Prestressed Concrete Girders

2010 ◽  
Vol 136 (4) ◽  
pp. 401-409 ◽  
Author(s):  
Ashraf Ayoub ◽  
Filip C. Filippou
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Prestressed Concrete ◽  
Element Model ◽  
Concrete Girders ◽  
Prestressed Concrete Girders

Nachweis der Kippstabilität schlanker Stahlbeton- und Spannbetonträger komplexer Geometrie mit der nicht-linearen FEM/Design of slender free formed reinforced and prestressed concrete girders against lateral instability

Bauingenieur ◽  
2017 ◽  
Vol 92 (05) ◽  
pp. 212-222
Author(s):  
A. Kolodziejczyk ◽  
R. Maurer
Keyword(s):  
Finite Element ◽  
Prestressed Concrete ◽  
Lateral Instability ◽  
Concrete Girders ◽  
Prestressed Concrete Girders

Oft erfüllen sehr schlanken Binder für weit gespannte Dachflächen im Fertigteilbau nicht das in DIN EN 1992–1–1 enthaltene geometrische Grenzkriterium für den vereinfachten Nachweis ausreichender Kippsicherheit. In der Praxis kommen in diesen Fällen häufig in der einschlägigen Fachliteratur beschriebene Näherungsverfahren zum Einsatz. Deren Anwendungsbereich beschränkt sich allerdings auf die für den Hallenbau typischen Parallelgurt- und Satteldachbinder. Ist die Kippsicherheit von freigeformten schlanken Trägergeometrien zu untersuchen, kann der Nachweis auf Grundlage nicht-linearer Finite-Element-Berechnungen erfolgen. Neben einer realitätsnahen Simulation des Tragverhaltens ist hierbei ein angepasstes Sicherheitskonzept für die Einhaltung des geforderten Sicherheitsniveaus bei nicht-linearen Verfahren nach DIN EN 1990 erforderlich. Dabei ist zu beachten, dass die derzeit in den Regelwerken enthaltenen vereinfachten Sicherheitskonzepte für nicht-lineare Verfahren ausschließlich für reine Biegeprobleme kalibriert wurden. Im Rahmen des Beitrags wird der Nachweis der Kippsicherheit mit der nicht-linearen FEM behandelt. Dabei stehen die wesentlichen Anforderungen an die Modellierung der Werkstoffeigenschaften, die Tragmechanismen bei Kippproblemen sowie ein angepasstes Sicherheitskonzept für nicht-lineare Berechnungsverfahren im Vordergrund.

The Characteristic of Prestressed Concrete Pier Seismic Crack

2014 ◽  
Vol 501-504 ◽  
pp. 1628-1632
Author(s):  
Hui Li Wang ◽  
Hong Wang ◽  
Si Feng Qin
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Prestressed Concrete ◽  
Three Dimensional ◽  
Element Model ◽  
Dimensional Finite Element ◽  
Tensile Zone ◽  
Three Dimensional Finite Element ◽  
Prestressed Reinforcement

Through three dimensional finite element analyzes, overall cast-in-place prestressed concrete pier seismic crack characteristic is researched. The separation formula finite element model is established by means of bilinear reinforce model and Kent-R.Park concretes model, without considering slip between concretes and. reinforce. It compares and analyzes the seismic crack characteristic between prestressed concrete pier and reinforcement concretes pier. The results show that the prestressed reinforcement can reduce the tensile zone of concrete, put off the appearance of cracks, improved the stiffness of pier, and reduced the top displacement.

Prestressed Time-Limited Aging Analyses of Concrete Containment Structure

2017 ◽  
Author(s):  
Dahua Cai ◽  
Yonghuan Wang ◽  
Jiangtao Zhang ◽  
Lin Yang ◽  
Hua Rong ◽  
...  
Keyword(s):  
Finite Element ◽  
Numerical Model ◽  
Finite Element Model ◽  
Prestressed Concrete ◽  
Element Model ◽  
Test Results ◽  
Prestress Loss ◽  
Pressure Test ◽  
Key Factor ◽  
Over Time

For prestressed concrete containment structure, prestress loss is a key factor that affects the performance of containment structure. Therefore, prestressed time-limited aging analysis (TLAA) is essential for containment structures. The main objective of prestressed TLAA is to assess the safety of containment structures after prestress loss occurred over time. This paper takes the in-service containment structure as an example to investigate the method of TLAA for grounted prestressed containment structure. Firstly, it introduces methods for prestressed TLAA. Secondly, a finite element model of containment structure is established to calculate the minimum required value (MRV) of prestress. The numerical model is verified by the pressure test results. Thirdly, prestress loss of tendons is calculated. Finally, the residual prestress of tendons are compared with the MRV of prestress to confirm whether the containment can service in a certain period. This study can provide guidance for goouted prestressed TLAA of containment structures.

Factors Influencing Natural Frequencies in a Prestressed Concrete Panel for Damage Detection

2014 ◽  
Vol 69 (3) ◽  
Author(s):  
L. D. Goh ◽  
A. A. Rahman ◽  
N. Bakhary ◽  
B. H. Ahmad
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Damage Detection ◽  
Prestressed Concrete ◽  
Natural Frequencies ◽  
Element Model ◽  
Modal Parameters ◽  
Actual Structure ◽  
Modal Test ◽  
The Finite Element Model

Modal parameters such as natural frequencies, mode shapes, and damping ratios are widely used as damage indicators in the field of vibration-based damage detection. These modal parameters can be easily obtained by conducting the modal test on the actual structure or from the finite element model. However, many publications are focusing only on the relationship between the modal parameters and the changes in structural properties for damage detection. There are a limited number of publications discussing on the factors that may affect the modal parameters for damage detection. Hence, this paper provides a study on the level of influence of several factors on the natural frequencies of a prestressed concrete panel. The factors that are considered in this study are the size of element used in the numerical model, the dimension of the structural element, and the prestressing force applied in the prestressed concrete panel. The natural frequencies computed from the finite element model are also verified with the actual measured natural frequencies that are determined through the modal test conducted in the laboratory. 

Finite Element Model Updating of a Prestressed Concrete Continuous Bridge Based on Dynamic Monitoring

2013 ◽  
Vol 405-408 ◽  
pp. 1645-1650
Author(s):  
Gang Xue ◽  
Wei Yu Bai ◽  
Xian Wang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Prestressed Concrete ◽  
Large Scale ◽  
Model Updating ◽  
Element Model ◽  
Ambient Vibration ◽  
Dynamic Monitoring ◽  
Modified Technique ◽  
Ambient Vibration Test

The finite element model modified technique based on optimization principle is benefit for the model updating of the large bridge structures. By the ambient vibration test information provided by health monitoring system of huanghe bridge II in baotou , this article adopted corrected parameter based on structural eigenvalue sensitivity analysis to update the bridge dynamic model.The fundamental vibrational frequency of updated finite element model is more closer to the measured result under ambient excitation, which indicates that the optimization algorithm provided by large-scale general software can carry out the model updating effectively.

Sign in / Sign up

Export Citation Format

Share Document