Experimental Stress Analysis with Automation of MeasureMents and Data Processing Using Vibro-Wire Gauges During the Construction of One Segmental Box-Girder Prestressed Concrete Bridge

1986 ◽  
pp. 65-73 ◽  
Author(s):  
T. Jávor ◽  
J. Trenčina
Keyword(s):  
Data Processing ◽  
Stress Analysis ◽  
Prestressed Concrete ◽  
Concrete Bridge ◽  
Experimental Stress ◽  
Box Girder ◽  
Experimental Stress Analysis ◽  
Automation Of Measurements ◽  
Prestressed Concrete Bridge

Report on the fifth international conference on experimental stress analysis

1974 ◽  
Vol 9 (3) ◽  
pp. 206-211
Author(s):  
M L Meyer
Keyword(s):  
Data Processing ◽  
Stress Analysis ◽  
Experimental Stress ◽  
International Conference ◽  
Experimental Stress Analysis

The Fifth International Conference on Experimental Stress Analysis was held on 27–31 May 1974 at Udine in Italy and was concerned with data processing in stress analysis, applications of stress analysis to materials behaviour, stress analysis in biomechanics, and advanced methods and applications of stress analysis in engineering.

Monitoring of External Prestressing Tendons Construction Process of Jiamusi Highway Prestressed Concrete Bridge during Strengthening in China

2010 ◽  
Vol 163-167 ◽  
pp. 2873-2879
Author(s):  
Ali Fadhil Naser ◽  
Zong Lin Wang
Keyword(s):  
Prestressed Concrete ◽  
Concrete Bridge ◽  
Construction Process ◽  
Box Girder ◽  
External Prestressing ◽  
Maximum Value ◽  
External Tendons ◽  
Monitoring Process ◽  
Left And Right ◽  
Prestressed Concrete Bridge

Jiamusi highway prestressed concrete bridge is located in the Jiamusi City within Heilongjiang province in the east north of China. The strengthening and repairing of the bridge structure can be provided an effective and economic solution in appropriate situation. The objective of this study are to monitor the construction process of external prestressing tendons for strengthening of Jiamusi highway prestressed concrete bridge. Monitoring process includes measurement of external prestressing tendons natural frequency, monitoring of tensile forces values of external prestressing tendons, monitoring of development of anchor beams cracks, and monitoring of anchor beam deformation. The results of monitoring process show that the box girder No. 11 has the largest values of proportional coefficient (K) and the maximum value is 327.8. Box girder No. 8 has the largest values of frequency, the maximum value is 3.499. Five levels of tension are used in the application of tensile force in the tension process of external prestressing tendons. These levels are level 1=248.2kN, level 2=496.4kN, level 3=744.6kN, level 4=992.8kN, and level 5=1241kN. The measured tendons elongation values of left box girder No.8 are more than the theoretical values. For left and right box girder No. 9, side external tendons of left box No. 10, and left and right box girder No. 11, the measured values are less than theoretical values of elongation. After tension process, there are no new cracks in the top, web, and bottom of anchor beam and a small number of cracks developed slightly. These cracks are found around ducts of external tendons. The length of cracks rang from 0.03m to 0.5m and width rang from 0.05 mm and 0.25mm. The longitudinal deformation of the interface and top of anchor beam is very small, ranging from 0.001mm to0.115mm, which averaged 0.026mm. The overall state of anchor beams and box girders during strengthening is good.

Field Damage Inspection and Static Load Test Analysis of Jiamusi Highway Prestressed Concrete Bridge in China

2010 ◽  
Vol 163-167 ◽  
pp. 1147-1156 ◽  
Author(s):  
Ali Fadhil Naser ◽  
Zong Lin Wang
Keyword(s):  
Prestressed Concrete ◽  
Steel Reinforcement ◽  
Load Test ◽  
Concrete Bridge ◽  
Bridge Structure ◽  
Static Load Test ◽  
Box Girder ◽  
Good State ◽  
Prestressed Concrete Bridge ◽  
Corrosion Of Steel

The main purpose of damage inspection of the bridge components is to ensure the safety of a bridge and to identify any maintenance, repair, or strengthening which that need to be carried out. The essential damages that occur in reinforced concrete bridge include different type of cracks, scalling and spalling of concrete, corrosion of steel reinforcement, deformation, excessive deflection, and stain. The main objectives of this study are to inspect the appearance of Jiamusi highway prestressed concrete bridge and describe all the damages in the bridge structural components, and to evaluate the structural performance of the bridge structure under dead and live loads. The field tests that are adopted in this study are the depth of concrete carbonation test, compressive strength of concrete test, corrosion of steel reinforcement test, and static load test. According to inspection of the bridge structure appearance, the overall states of bridge structure in good and there are not serious damages, but there are diagonal and longitudinal cracks in the inside web of box girder within block No.8 and 9. Expansion joints suffer from serious damage such as deformation of expansion joint rubber, dislocating, shedding, and cracking. The field test results show that the concrete of the bridge structure has not carbonation; the strength of concrete in good state; there is not corrosion in steel reinforcement; The values of load test for vertical deflection, strain, and stress are less than the theoretical values and the results of cracks observation show that there is not changing in the length of diagonal cracks in the web of box girder when the load test is applied. This indicates that the working state and carrying capacity of the bridge structure in good state.

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.

scholarly journals DETERMINATION OF THE VIBRATION CHARACTERISTICS OF BRIDGE IN DYNAMIC DIAGNOSIS

1998 ◽  
Vol 20 (2) ◽  
pp. 18-26
Author(s):  
Nguyen Cao Menh ◽  
Pham Xuan Khang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Data Processing ◽  
Dynamic Characteristics ◽  
Prestressed Concrete ◽  
Concrete Bridge ◽  
Prestressed Concrete Bridge ◽  
Dynamic Diagnosis ◽  
Clear Information

On the basis of dynamic diagnosis equipment VDIK-1-10 of Russia and finite element method (FEM), the procedures for finding the exciting places and measurement points of vibration are presented. They give us clear information of diagnostic parameters. After data processing we can determine the dynamic characteristics parameters of the bridge. The parameters obtained are used to updating modeling parameters of FEM and therefore the technical state of the bridge could be estimated. An example for investigation of prestressed concrete bridge with 33 m span and 10m width is illustrated.

Chloride Testing of 27-Vear-Old Prestressed Concrete Bridge Beams

PCI Journal ◽  
1992 ◽  
Vol 37 (5) ◽  
pp. 68-79 ◽  
Author(s):  
Valerie E. Murray ◽  
Gregory C. Frantz
Keyword(s):  
Prestressed Concrete ◽  
Concrete Bridge ◽  
Bridge Beams ◽  
Prestressed Concrete Bridge

Full Depth Precast and Precast, Prestressed Concrete Bridge Deck Panels

PCI Journal ◽  
1995 ◽  
Vol 40 (1) ◽  
pp. 59-80 ◽  
Author(s):  
Mohsen A. lssa ◽  
Ahmad-Talalldriss ◽  
lraj I. Kaspar ◽  
Salah Y. Khayyat
Keyword(s):  
Prestressed Concrete ◽  
Bridge Deck ◽  
Concrete Bridge ◽  
Deck Panels ◽  
Concrete Bridge Deck ◽  
Prestressed Concrete Bridge ◽  
Precast Prestressed Concrete
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