scholarly journals Metode Penilaian Kondisi Jembatan Beton Prategang

2017 ◽  
Vol 1 ◽  
pp. 72
Author(s):  
Hasanudin Hasanudin
Keyword(s):  
Prestressed Concrete ◽  
Management System ◽  
Precast Concrete ◽  
Concrete Bridges ◽  
Concrete Bridge ◽  
Bridge Management ◽  
Destructive Testing ◽  
Bridge Management System ◽  
Building Maintenance ◽  
Prestressed Concrete Bridge

Abstract— Bridges as one of the infrastructure that plays a role in supporting ground transportation, during it service will experience a decrease in conditions caused by the influence of traffic loads, weather effects, environmental influences or other influences. To eliminate the interference required maintenance. A building maintenance including a bridge is preceded by a condition checking activity, and subsequent assessment of conditions. During this examination and assessment of the condition of the bridge refers to the method of inspection and assessment of the conditions set in Bridge Management System (BMS) 1993. There are still weaknesses in the assessment of conditions with Bina Marga BMS caused by the absence of methods of assessing the condition of prestressed concrete bridges. This research is a development of BMS condition assessment, to be used as an assessment of prestressed concrete bridge condition. The object of this research is focused on prestressed precast concrete bridge, namely Kiaracondong Bridge (Bandung) and Cimindi bridge (Cimahi) West Java. The method of assessing the condition undertaken is the examination of damage to the bridge components (physical indicator) through visual inspection, not equipped with destructive and non destructive testing (advanced stage of inspection). Assessment of the conditions developed is the assessment of conditions on the security aspects of the structure and aspects of traffic convenience, where the structure security aspect is the multiplication of the condition of the main part of the building over the bridge. After doing research it can be seen that Cimindi bridge condition value is 3,5-4,25 (need monitoring) and Kiaracondong bridge (very good). The deficiency in the method of assessing the condition in this study is that the assessment of the condition of the bridge is done visually only, so it can not predict the damage to the prestressed concrete components inside. Further examination is required after examination and assessment of this condition is done especially when it is found suspicious things.Keywords: Bridge Management System; Assessment of bridge condition; Prestressed Concrete

Saint-Venant torsion constant of modern precast concrete bridge girders

PCI Journal ◽  
2021 ◽  
Vol 66 (3) ◽  
pp. 23-31
Author(s):  
Richard Brice ◽  
Richard Pickings
Keyword(s):  
Prestressed Concrete ◽  
High Performance Concrete ◽  
Precast Concrete ◽  
The United States ◽  
Bridge Girders ◽  
Concrete Bridge ◽  
Approximate Methods ◽  
Standard Design ◽  
Prestressed Concrete Bridge ◽  
Precast Prestressed Concrete

Many bridge owners have developed new precast, prestressed concrete bridge girder sections that are optimized for high-performance concrete and pretensioning strands with diameters greater than 0.5 in. (12.7 mm). Girder sections have been developed for increased span capacities, while others fill a need in shorter span ranges. Accurate geometric properties are essential for design. Common properties, including cross-sectional area, location of centroid, and major axis moment of inertia, are generally easy to compute and are readily available in standard design references. Computation of the torsion constant is a different matter. This paper presents the methods and results of a study to determine the torsion constant for many of the modern precast, prestressed concrete bridge girders used in the United States and compares the results with values from the approximate methods of the AASHTO LRFD specifications.

Practical Applications of a Bridge Management System in Japan

2000 ◽  
Vol 1696 (1) ◽  
pp. 14-25 ◽  
Author(s):  
Ayaho Miyamoto ◽  
Kei Kawamura ◽  
Hideaki Nakamura
Keyword(s):  
Management System ◽  
Life Cycle Cost ◽  
Concrete Bridges ◽  
Maintenance Cost ◽  
Bridge Management ◽  
Bridge Management System ◽  
Practical Applications ◽  
Optimal Maintenance ◽  
Existing Bridges ◽  
Comparison Of The Results

Recently, the necessity of developing a practical bridge management system (BMS) has been pointed out in Japan, because the maintenance of existing bridges has become a major social concern. The aim of this study was to develop a practical BMS for deteriorated concrete bridges. The proposed system (J-BMS) uses multilayered neural networks to predict deterioration processes in existing bridges, to construct an optimal maintenance plan for repair or strengthening measures based on minimizing life-cycle cost, and to estimate the maintenance cost. A comparison of the results of applying this system to some actual in-service bridges with the results of questionnaire surveys of experts indicates that optimal maintenance planning as well as bridge rating can be predicted accurately by this system.

Fatigue reliability of deteriorating prestressed concrete bridges due to stress corrosion cracking

2001 ◽  
Vol 28 (4) ◽  
pp. 673-683 ◽  
Author(s):  
M A Maes ◽  
X Wei ◽  
W H Dilger
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Prestressed Concrete ◽  
Corrosion Cracking ◽  
Concrete Bridges ◽  
Concrete Bridge ◽  
Fatigue Reliability ◽  
Prestressing Steel ◽  
Prestressed Concrete Bridges ◽  
Prestressed Concrete Bridge

In this paper, an analysis framework is presented to develop a relationship between fatigue reliability in a prestressed concrete bridge and the progress of stress corrosion cracking (SCC) in prestressing steel. The fatigue limit state uses a cumulative damage model for prestressing steel wires, which is a function of both stress range and minimum stress. The SCC model takes into account varying degrees of material susceptibility, stress regimes, and environmental conditions and is structured around three stages: initiation of micro-cracking, propagation, and macro-crack instability using linear elastic fracture mechanics. The framework is an overall time-dependent analysis of the safety against fatigue of a prestressed concrete bridge. It involves a stochastic analysis of the evolution of prestressing wire corrosion as a function of time and a time-dependent probabilistic analysis of the fatigue reliability of the prestressed concrete bridge suffering a certain degree of deterioration. The uncertainties involved in the fatigue model, the SCC model, and traffic actions are considered. The updating of uncertainties is simplified by considering a limited number of classes representative of the severity of SCC exposure. The framework is applied to three deteriorating highway bridges.Key words: fatigue analysis, prestressing strands, stress corrosion cracking, reliability assessment, prestressed concrete bridges, deterioration.

INTRODUCTION TO CAMBER CONTROL, PRESTRESSED CONCRETE BRIDGE GIRDERS

2014 ◽  
Vol 4 (2) ◽  
pp. 535-538
Author(s):  
Akhil Ratra ◽  
Kuldeep Singh ◽  
Sandeep Dhillon
Keyword(s):  
Prestressed Concrete ◽  
Concrete Bridges ◽  
Bridge Girders ◽  
Concrete Bridge ◽  
Ultimate Capacity ◽  
Simply Supported ◽  
Allowable Stresses ◽  
Bridge Girder ◽  
Common Problems ◽  
Prestressed Concrete Bridge

When designing a bridge, serviceability usually controls and is a more important factor than the ultimate capacity of the bridge or the allowable stresses. Therefore, the behaviour of the bridge girder deflection and camber must be predicted as accurately as possible. Therefore, excessive camber has become one of the most common problems when constructing concrete bridges. Different methods have been developed to overcome this problem. The most common and widely used is using haunch with adjustable pedestals to overcome the excessive camber. However, this method has limitations that must be considered. Therefore, this study is evaluating the effectiveness of using post tensioning jacking strands at the top flange of simply supported bridge girders to reduce the excessive camber and make it equal to the design camber.

Identifying the Prestress Force in Prestressed Concrete Bridges Using Ultrasonic Technology

2020 ◽  
Vol 20 (10) ◽  
pp. 2042014
Author(s):  
Manal Hussin ◽  
Tommy H. T. Chan ◽  
Sabrina Fawzia ◽  
Negareh Ghasemi
Keyword(s):  
Ultrasonic Wave ◽  
Prestressed Concrete ◽  
Concrete Bridges ◽  
Concrete Bridge ◽  
Box Girder ◽  
Bridge Model ◽  
Ultrasonic Technology ◽  
Effect Theory ◽  
Prestressed Concrete Bridge ◽  
Relative Change

In this research, ultrasonic tests were performed on a prestressed concrete box-girder model to identify the prestressed force according to the acoustoelastic theory. During the tests, the ultrasonic wave was generated using piezoelectric transducers and emitted to the prestressed concrete bridge model. The concrete bridge model was subjected to three different levels of prestress force (PF), which were limited to about 30%, 50% and 80% of the ultimate tensile strength. The experimental results showed the increase in prestress force level leads to an increase in the relative change in the wave velocity and the amplitude energy of the ultrasonic wave which proved the acoustoelastic effect theory. This study contributes to the knowledge of the acoustoelastic behavior of the prestressed concrete and presents the capability of the ultrasonic system in evaluating the stress state in the prestressed concrete bridge.

Damage Assessment of One Prestressed Concrete Bridge after Fire

2012 ◽  
Vol 256-259 ◽  
pp. 2729-2734 ◽  
Author(s):  
Kai Xiang ◽  
Guo Hui Wang ◽  
Hua Xin Liu
Keyword(s):  
Prestressed Concrete ◽  
Damage Assessment ◽  
Assessment Method ◽  
Concrete Bridges ◽  
Concrete Bridge ◽  
Hollow Core ◽  
Plate Girders ◽  
Prestressed Concrete Bridges ◽  
Prestressed Concrete Bridge ◽  
Historical Sketch

The assessment method of fire-damaged concrete bridge with prestressed hollow core plate girders was presented in this paper. The historical sketch of assessment of fire-damaged concrete structures was briefly introduced. One fire-damaged concrete bridge with prestressed hollow core plate girders was shown as an example. The process of assessment of fire-damaged concrete bridge with prestressed hollow core plate girders was provided. According to the assessment results, methods of repair and strengthening were presented for different fire-damaged level of prestressed hollow core plate girders. The research results could help expand use of fire-damaged assessment and repair of prestressed concrete bridges.

scholarly journals Dynamic Behavior of a Prestressed Concrete Bridge with a Switching Crack Subjected to Moving Trains

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Chunyu Fu
Keyword(s):  
Dynamic Behavior ◽  
Prestressed Concrete ◽  
Concrete Bridges ◽  
Concrete Bridge ◽  
The Finite Element Method ◽  
Static Loads ◽  
Motion Equations ◽  
Nonlinear Responses ◽  
Vehicle Mass ◽  
Prestressed Concrete Bridge

Concrete bridges chronically exposed to the natural environment are vulnerable to cracking. Under prestressing forces, the crack may close, but it will open under large dynamic loads, such as heavy trains. So the crack state can switch during the vibration. This paper investigates the nonlinear dynamic behavior of the prestressed concrete bridge with such a switching crack subjected to moving trains. Firstly, the finite element method is adopted to formulate the motion equations of train-bridge system while the crack state remains constant. Then the displacement components are analyzed to investigate the effect of static loads at the switching instant. Finally, an iterative algorithm is adopted to calculate the nonlinear responses. The proposed method is verified by the calculation of an actual prestressed concrete bridge, and the results show that the crack switching can increase the peak of the bridge displacement during the vibration, cause an obvious nonlinearity between the displacement and the vehicle mass, and make the displacement become more variable with the train velocity.

scholarly journals AVALIAÇÃO DA CONFIABILIDADE DE PONTES EM CONCRETO PROTENDIDO SOB SOLICITAÇÕES NORMAIS

2017 ◽  
Vol 13 (2) ◽  
Author(s):  
Silvia Juliana Sarmiento Nova ◽  
Maria Cecilia Amorim Teixeira da Silva
Keyword(s):  
Sensitivity Analysis ◽  
Monte Carlo ◽  
Prestressed Concrete ◽  
Structural Reliability ◽  
Simulation Method ◽  
Concrete Bridges ◽  
Evaluation Procedure ◽  
Concrete Bridge ◽  
Geometrical Properties ◽  
Prestressed Concrete Bridge

RESUMO: O presente trabalho consiste em sistematizar um procedimento para avaliação da confiabilidade estrutural de pontes de concreto protendido, com base no índice de confiabilidade β, e a correspondente probabilidade de falha Pf. O Método de Monte Carlo é utilizado no processo de simulação das variáveis aleatórias, tomadas como sendo as resistências dos materiais, algumas das propriedades geométricas e o carregamento aplicado à estrutura. Como ferramenta para análise estrutural, é utilizado um programa computacional comercial. Os valores obtidos pelo método de simulação são validados através do método analítico FORM, e realiza-se também uma análise de sensibilidade. O procedimento é aplicado a uma ponte de concreto protendido de viga-e-laje. Com base nos resultados alcançados na análise desenvolvida conclui-se que o procedimento sistematizado, o qual utiliza um método de simulação, pode ser utilizado para avaliar a confiabilidade de uma ponte em concreto protendido de uma forma mais prática e efetiva. A análise de sensibilidade permitiu identificar as variáveis que apresentam maior influência na avaliação da segurança da estrutura.ABSTRACT: This paper is proposed to systematize the structural reliability evaluation procedure of prestressed concrete bridges, based on the reliability index β, and the corresponding probability of failure Pf. The Monte Carlo method is used to simulate design variables, taken as the resistances of the materials, some geometrical properties and the loads applied to the structure. As a tool for structural analysis, a commercial computer program is used. The values obtained by simulation method are validated by the analytical method FORM, and a sensitivity analysis is carried out. The procedure is applied to a deck-girder prestressed concrete bridge. Based on the results obtained, it is concluded that the procedure, which is based on a simulation method, can be used to evaluate the reliability of a prestressed concrete bridge in a more practical and effective way. The sensitivity analysis identified the variables with the greatest influence on the assessment of the safety of the structure.

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