A note on concrete creep analysis under static temperature fields

1974 ◽  
Vol 7 (5) ◽  
pp. 329-333 ◽  
Author(s):  
I. J. Jordaan
Keyword(s):  
Temperature Fields ◽  
Concrete Creep ◽  
Creep Analysis

scholarly journals Fine-Grainedcellular Concrete Creep Analysis Technique with Consideration Forcarbonation

2015 ◽  
Vol 9 (4) ◽  
Author(s):  
Said-Alvi Yusupovich Murtazaiev ◽  
Valeriy Stanislavovich Lesovik ◽  
Deni Karim-Sultanovich Bataiev ◽  
Natalia Vasilievna Chernysheva ◽  
Magomed Salamuvich Saidumov
Keyword(s):  
Concrete Creep ◽  
Analysis Technique ◽  
Creep Analysis

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.

Selection of Concrete Creep Analytical Models for Modern Prestressed Bridges

2011 ◽  
Vol 90-93 ◽  
pp. 1023-1026
Author(s):  
Qing Xiang Zeng ◽  
Da Jian Han
Keyword(s):  
Prestressed Concrete ◽  
Building Materials ◽  
Concrete Strength ◽  
Construction Materials ◽  
Concrete Bridges ◽  
Analytical Models ◽  
Initial Stresses ◽  
Design Stage ◽  
Concrete Creep ◽  
Creep Analysis

The modern prestressed concrete bridges have the characteristics of large-span, high concrete strength, reinforced volume prestress and linear shape complexity. The structure bearing capacity and durability are considerable impacted by concrete creep, such as stresses redistribution and deflections increase. Some of the prediction concrete creep models that are being widely used at present are briefly introduced in this paper. Based on the analysis of existing research achievement, for the aim of improving the calculation accuracy of creep effects in bridge structures, several main problems that should be paid attention to in concrete creep analysis are pointed out from four aspects: (1) in design stage, the reasonable creep prediction model should be selected in accord with the local building materials and environment conditions; (2) during the analysis of creep effects, the initial stresses state and the stresses redistribution should be attended; (3) the reliability of prestress loss calculation should be considered in analysis of concrete creep effects; (4) the differences between normal construction materials and that of new types should be taken into account in concrete creep analysis.

Analysis on the Deflection of Cantilever Construction Based on Viscoelasticity

2014 ◽  
Vol 1030-1032 ◽  
pp. 1078-1081
Author(s):  
Long Fan Peng ◽  
Zhi Da Li
Keyword(s):  
Construction Process ◽  
Analysis Method ◽  
Viscoelastic Problem ◽  
Concrete Creep ◽  
Creep Effect ◽  
Rigid Frame ◽  
Creep Analysis ◽  
Cantilever Construction ◽  
Rigid Frame Bridge

The creep of concrete in the construction process of deformation influential, especially in the cantilever pouring construction, short age of concrete, creep effect more apparent. Meaning for cantilever construction of Bridges, creep analysis must be properly considered section at different time of loading values and the concrete ages of different segments. In this paper, based on the viscoelastic problem of cantilever construction of concrete creep analysis method, analyzes the deflection of cantilever construction process of a rigid-frame bridge, and compared with the actual measured value.

The growth of mica polytypes as studied by conventional and high-resolution TEM

1983 ◽  
Vol 41 ◽  
pp. 174-177
Author(s):  
A. Baronnet ◽  
M. Amouric
Keyword(s):  
Water Pressure ◽  
Point Of View ◽  
Temperature Fields ◽  
Natural Occurrence ◽  
Growth Mechanisms ◽  
Long Period ◽  
High Resolution Tem ◽  
Layer Stacking ◽  
Experimental Works ◽  
Potential Use

The origin of mica polytypes has long been a challenging problem for crystal- lographers, mineralogists and petrologists. From the petrological point of view, interest in this field arose from the potential use of layer stacking data to furnish further informations about equilibrium and/or kinetic conditions prevailing during the crystallization of the widespread mica-bearing rocks. From the compilation of previous experimental works dealing with the occurrence domains of the various mica "polymorphs" (1Mr, 1M, 2M1, 2M2 and 3T) within water-pressure vs temperature fields, it became clear that most of these modifications should be considered as metastable for a fixed mica species. Furthermore, the natural occurrence of long-period (or complex) polytypes could not be accounted for by phase considerations. This highlighted the need of a more detailed kinetic approach of the problem and, in particular, of the role growth mechanisms of basal faces could play in this crystallographic phenomenon.

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