scholarly journals Concrete Creep Analysis Method Based on a Long-Term Test of Prestressed Concrete Beam

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Mingfang Yang ◽  
Song Jin ◽  
Jinxin Gong
Keyword(s):  
Prestressed Concrete ◽  
Concrete Beam ◽  
Creep Model ◽  
Test Results ◽  
Analysis Method ◽  
Loading Test ◽  
Concrete Creep ◽  
Prestressed Concrete Beam ◽  
Creep Analysis

Concrete creep plays a significant role in the long-term performance of the prestressed concrete structure. However, most of the existing prediction models cannot accurately reflect the in-site concrete creep in a bridge construction environment. To improve the prediction accuracy of creep effects in concrete structures, an innovative creep analysis method is developed in this study. Parameters in the creep model in fib MC 2010 have been calibrated with respect to the long-term loading test results of the prestressed concrete beam. The measured strains of concrete and the midspan deflections of the test beam are compared with the predicted results using the creep model in fib MC 2010. It indicates that the results predicted by the calibrated creep model are in good agreement with the test results. However, the results predicted by the creep model in fib MC 2010 significantly deviate from the test results. This proposed creep analysis method can provide a new thought to improve the predicted effect of the creep effects on creep-sensitive structures.

scholarly journals Expansion Behavior of Prestressed Concrete Beam Deteriorated by Alkali-Silica Reaction under Long Term Exposure Test

2008 ◽  
Vol 57 (10) ◽  
pp. 973-980 ◽  
Author(s):  
Kazunori SASAKI ◽  
Shigeru MATSUMOTO ◽  
Yoshio HISARI ◽  
Kazuhiro KUZUME ◽  
Syo KANAUMI ◽  
...  
Keyword(s):  
Prestressed Concrete ◽  
Concrete Beam ◽  
Alkali Silica Reaction ◽  
Exposure Test ◽  
Prestressed Concrete Beam ◽  
Expansion Behavior

scholarly journals CYCLIC LOADING TEST OF PRECAST PRESTRESSED CONCRETE BEAM-COLUMN CONNECTIONS WITH STEEL-CAP

2008 ◽  
Vol 14 (27) ◽  
pp. 115-120
Author(s):  
Hitoshi YAMASHITA ◽  
Takeaki KOSHIKAWA ◽  
Toshinaga WADA ◽  
Masaiki UEDA ◽  
Mitsuo MIZOGUCHI ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Prestressed Concrete ◽  
Concrete Beam ◽  
Loading Test ◽  
Cyclic Loading Test ◽  
Prestressed Concrete Beam ◽  
Precast Prestressed Concrete

Test Research of Prestressed Concrete Beams with CFRP under Low Cyclic Loading

2010 ◽  
Vol 163-167 ◽  
pp. 3848-3852
Author(s):  
De Bao Jiang ◽  
Xiao Jing Gu
Keyword(s):  
Cyclic Loading ◽  
Prestressed Concrete ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Test Results ◽  
Root Structure ◽  
Reinforcement Effect ◽  
Prestressed Concrete Beam ◽  
Number Of Layers ◽  
Low Cyclic Loading

Through testing it is obtained that force and the damage that 1 root structure of prestressed concrete beams strengthened and 3 different layers CFRP reinforced stickup prestressed concrete beams under cyclic loading. This test results show that CFRP reinforcement effect of prestressed concrete beams is obvious, and at the same time the cracking of prestressed concrete beam has also has certain reinforcement effect; But the CFRP reinforcement effect is proportional to the number of layers.

Analysis of loss in flexural stiffness of in-service prestressed hollow plate beam

2019 ◽  
Vol 10 (4) ◽  
pp. 534-547
Author(s):  
Guanhua Zhang ◽  
Jiawei Wang ◽  
Jinliang Liu ◽  
Yanmin Jia ◽  
Jigang Han
Keyword(s):  
Prestressed Concrete ◽  
Concrete Beam ◽  
Human Life ◽  
Calculation Model ◽  
Flexural Stiffness ◽  
Loading Test ◽  
Content Type ◽  
Prestressed Concrete Beam ◽  
Non Linear ◽  
Prestressed Reinforcement

Purpose During service, cracks are caused in prestressed concrete beams owing to overload or other non-load factors. These cracks significantly affect the safety of bridge structures. The purpose of this paper is to carry out a non-linear iterative calculation for a section of a prestressed concrete beam and obtain the change in stiffness after the section cracks. Design/methodology/approach The existing stress of prestressed reinforcement was measured by performing a boring stress release test on two pieces of an in-service 16 m prestressed concrete hollow plate. Considering the non-linear effects of materials, the calculation model of the loss in the flexural stiffness of the prestressed concrete beam was established based on the existing prestress. The accuracy of the non-linear calculation method and the results obtained for the section were verified by conducting a bending destruction test on two pieces of the 16 m prestressed concrete hollow plate in the same batch and by utilising the measured strain and displacement data on the concrete at the top edge of the midspan section under all load levels. Findings The flexural stiffness of the section decreases rapidly at first and then gradually, and structural rigidity is sensitive to the initial cracking of the beam. The method for calculating the loss in the flexural stiffness of the section established with the existing stress of prestressed reinforcement as a parameter is accurate and feasible. It realizes the possibility of assessing the loss in the rigidity of a prestressed concrete structure by adopting the existing stress of prestressed reinforcement as a parameter. Originality/value A method for quickly determining the loss in the stiffness of structures using existing prestress is established. By employing this method, engineers can rapidly determine whether a bridge is dangerous or not without performing a loading test. Thus, this method not only ensures the safety of human life, but also reduces the cost of testing.

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