Expedient Service Load Analysis of Cracked Prestressed Concrete Sections

PCI Journal ◽  
1982 ◽  
Vol 27 (6) ◽  
pp. 86-111 ◽  
Author(s):  
Maher K. Tadros
Keyword(s):  
Prestressed Concrete ◽  
Service Load ◽  
Load Analysis

scholarly journals Service load analysis of unbonded partially prestressed concrete members

2005 ◽  
Vol 57 (4) ◽  
pp. 199-209 ◽  
Author(s):  
F. T. K. Au ◽  
J. S. Du ◽  
Y. K. Cheung
Keyword(s):  
Prestressed Concrete ◽  
Concrete Members ◽  
Service Load ◽  
Load Analysis

scholarly journals Studi Mengenai Analisis Penampang Balok Prategang Parsial pada Beban Kerja. (Hal. 83-95)

2019 ◽  
Vol 5 (2) ◽  
pp. 83
Author(s):  
Dally Margan ◽  
Priyanto Saelan
Keyword(s):  
Prestressed Concrete ◽  
Failure Load ◽  
Analysis Method ◽  
Study Results ◽  
Service Load ◽  
Building Safety ◽  
Load Analysis ◽  
Beam Section ◽  
Prestressed Beam

ABSTRAKPenampang balok prategang parsial dapat dirancang dengan dua metode analisis yaitu metode analisis terhadap beban runtuh dan metode analisis terhadap beban kerja. Perancangan penampang balok prategang parsial pada umumnya dilakukan dengan menggunakan metode analisis terhadap beban runtuh yang telah ditetapkan dalam SNI 03-2847-2002, namun perancangan menggunakan pendekatan beban kerja tidak dicantumkan. Oleh karena itu dilakukan studi analisis untuk mengetahui sejauh mana metode analisis terhadap beban kerja dapat diaplikasikan dalam perancangan penampang balok prategang parsial. Studi kasus ini dilakukan dengan persentase 60, 70, 80, dan 90. Dari hasil studi kasus didapatkan bahwa dengan menggunakan metode analisis terhadap beban kerja dapat dilakukan namun dengan batasan persentase prategang yang beragam yaitu 90, 95, dan 99. Metode analisis terhadap beban kerja dapat dilakukan pada kasus-kasus tertentu dan menggunakan beton dan tendon dengan mutu tinggi untuk faktor keamanan bangunan.Kata kunci: beton prategang parsial, pendekatan beban kerja, persentase prategang, lebar retak ABSTRACTPartial prestressed beam section can be designed with two analysis methods are failure load analysis method and service load analysis method. The design of the partial prestressed beam section generally is using the failure load analysis method which has been specified in SNI 03-2847-2002, but the design with the analytical method of service load is not included. Therefore an analytical study was conducted to determine the extent to which the service load analysis method can be applied for the design of a partial prestressed beam section. This case study was carried out at 60, 70, 80, and 90 prestressed percentages. From the case study results it was found that using the analysis method of service load can be done but with variations of a limited percentage are 90, 95, and 99. The method of analysis of workload can be done in certain cases and using high-quality concrete and tendons for building safety factor.Keywords: partial prestressed concrete, service load analysis method, prestressed percentage, crack width

Loading Capacity of Prestressed Concrete Sleeper under Harmonic Function

2014 ◽  
Vol 661 ◽  
pp. 118-122 ◽  
Author(s):  
Nizam I. Sharul ◽  
E. Dozier ◽  
A.B. Afidah ◽  
H. Siti Hawa ◽  
Fazlan R. Mohd Ikmal
Keyword(s):  
Harmonic Function ◽  
Prestressed Concrete ◽  
Fatigue Cracking ◽  
Fatigue Loading ◽  
Flexural Behavior ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Service Load ◽  
Major Structural Component ◽  
Wheel Loading

A significant increase in demand for services will mean volatility axial load applied to structural elements, particularly the railway station when a train distributions narrow peak intervals. The prestressed concrete runway is one of the major structural component of the train and was showing fatigue cracking as a result of this change. Any local information that link fatigue fracture in concrete directly to understand the fatigue performance are limited. It is important that the load can be simulated real train closed to those under service load. This work aims to study the ability to withstand fatigue loading during services and the flexural behavior of sleeper under low velocity impact loading. The outcome of the work is to produce a harmonic function that will express the variable amplitude waveform through numerical modeling constant amplitude. This is involved a PSC responses due to train wheel loading of the commuter train.

Numerical Modelling and Analysis of a Hybrid-Spar Floating Wind Turbine

2017 ◽  
Author(s):  
Tomoaki Utsunomiya ◽  
Iku Sato ◽  
Osamu Kobayashi ◽  
Takashi Shiraishi ◽  
Takashi Harada
Keyword(s):  
Numerical Modelling ◽  
Wind Turbine ◽  
Prestressed Concrete ◽  
Analysis Model ◽  
Design Load ◽  
Floating Wind Turbine ◽  
Load Analysis ◽  
Precast Prestressed Concrete ◽  
Numerical Modelling And Analysis ◽  
Nagasaki Prefecture

In this paper, numerical modelling and analysis of a hybrid-spar floating wind turbine is presented. The hybrid-spar consists of steel at the upper part and the precast prestressed concrete (PC) at the lower part. Such a configuration is referred to as a hybrid-spar in this paper. The hybrid spar was successfully installed offshore of Kabashima Island, Goto city, Nagasaki prefecture, Japan on October 18, 2013 (see OMAE2015-41544 [1] for details). In this paper, some details on numerical modelling of the hybrid-spar for design load analysis are presented. Then, the validation of the numerical analysis model is presented for a full-scale hybrid-spar model with 2-MW wind turbine.

ON THE REDUCTION OF PRESTRESSING FORCE NEAR SUPPORTS IN PARTIALLY PRESTRESSED CONCRETE FLEXURAL MEMBERS

2018 ◽  
Vol 5 (2) ◽  
Author(s):  
Nazar Oukaili
Keyword(s):  
Prestressed Concrete ◽  
Load Capacity ◽  
Compression Zone ◽  
Flexural Members ◽  
Tensile Stresses ◽  
Prestressing Force ◽  
Service Load ◽  
Bending Stresses ◽  
The Moment ◽  
Concrete Section

Straight tendons in pretensioned members can cause high-tensile stresses in the concrete extreme fibers at end sections because of the absence of the bending stresses due to self-weight and superimposed loads and the dominance of the moment due to prestressing force alone. Accordingly, the concrete tensile stresses at the ends of a member prestressed with straight tendons may limit the service load capacity of the member. It is therefore important to establish limiting zone in the concrete section within which the prestressing force can be applied without causing tension in the extreme concrete fibers. Two practical methods are available to reduce the stresses at the end sections due to the prestressing force. The first method based on changing the eccentricity of some tendons by raising them towards the end zone. The second method is based on bond prevention by encasing some of the tendons in plastic sheathing, effectively moving the point of application of prestressing force inward toward midspan for part of tendons. The present study focuses on a proposed third method to reduce the effect of the prestressing force near end supports by using straight strands with limited initial prestressing value in compression zone. New equations were suggested for the cracking moment and the prestressing force which consider the prestressed tendons in compression zone.

Field evaluation and model test of a composite wing-girder bridge

1987 ◽  
Vol 14 (6) ◽  
pp. 753-762 ◽  
Author(s):  
John E. Breen ◽  
Michael E. Kreger ◽  
Christopher D. White ◽  
Gordon C. Clark
Keyword(s):  
Prestressed Concrete ◽  
Load Transfer ◽  
Field Evaluation ◽  
Field Testing ◽  
Scale Model ◽  
Construction Monitoring ◽  
Service Load ◽  
Girder Bridge ◽  
High Level ◽  
Post Tensioned

This paper presents the key observations and conclusions from the evaluation of an innovative "loose-fit" composite, post-tensioned concrete wing-girder bridge proposed for an elevated interstate highway expansion in an urban environment. The evaluation program included both testing to destruction of a 1/2-scale model of a partial span as well as construction monitoring and field testing at service load levels of a full-scale prototype two-span bridge. Results of both construction measurements and loading tests were compared with analytical predictions. Laboratory tests showed the composite behavior of the wing-girder joint to be fully effective and a high level of load transfer between wings to be present. Recommendations for modification of the prototype design are made to improve constructibility, durability, structural performance, and economy. Key words: box girder, bridge, post-tensioned, prestressed concrete, reinforcement, stresses, temperature, tendons.

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