The high temperature behaviour of concrete under biaxial conditions

Ehm, C.; Schneider, Ulrich

doi:10.1016/0008-8846(85)90005-5

Cited by 45 publications

(19 citation statements)

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“…in [2], [5] and [6]. There are also the studies of Ehm et al [12] and Kubota et al [16], which are related to the compressive strength of confined concrete Although an increase in the compressive strength of confined concrete at high temperatures can be expected, as shown above, the amount of data is extremely low, and since the meaning of the existing data is not sufficiently clear, there is a need for collecting additional data.…”

Section: Compressive Strength At High Temperaturesmentioning

confidence: 98%

“…With respect to the three-dimensional behavior of concrete subjected to compression at high temperatures, Ehm and Shneider have measured the stress-strain relation, including lateral strain, for different temperatures between ambient temperature and 600°C, by using a cubical test sample with a side of 200 mm and water-cement ratio of 45% which includes quartzitic coarse aggregate with a maximum size of 16 mm [12]. This is the only example of stress-strain relation measurement at high temperatures which includes lateral strain.…”

Section: Stress-strain Relationsmentioning

confidence: 99%

“…This is the only example of stress-strain relation measurement at high temperatures which includes lateral strain. According to [12], the lateral strain at peak stress is 50% of the longitudinal strain at ambient temperature. However, the ratio of the lateral strain to the longitudinal strain increases as the temperature of the concrete elevates, and at 600°C it is about 90%, which means that the lateral strain becomes comparable to the axial strain at high temperatures (cf.…”

Section: Stress-strain Relationsmentioning

confidence: 99%

“…Figure 1). Figure 1 The stress-strain relation as described in [12] In order to define the multiaxial stress-strain relation of concrete, we need to define the following three parameters: the stress-strain relation, the Poisson ratio and the plastic flow rule. Since there have been almost no attempts for experimental validation of the plastic flow rule for concrete at ambient temperature, the associated flow rule, which is considered to emerge perpendicularly to the yield surface, is used in many cases as the plastic flow [14].…”

Section: Stress-strain Relationsmentioning

confidence: 99%

“…However, in most of the previous studies related to the high-temperature properties of concrete, only the longitudinal strain has been measured, while the lateral strain has been measured in none but one experiment which studied the stress-strain relation [12]. Since there have been no measurements of lateral transient thermal strain, it is not clear whether expansion or shrinkage occurs in that direction.…”

Section: Introductionmentioning

confidence: 99%

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A Study on Compressive Strength and Strain Behavior of Concrete at High Temperatures<BR>-Chapter 1 Introduction-

Michikoshi

2008

Fire Science and Technology

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Although reinforced concrete structures are generally considered to be resistant to fire, there are cases where large quantities of combustibles are present, the fire continues for a long time, or where the long-term load on the structural members is high, and thus the construction could collapse [1]. Even when structures are built using reinforced concrete, their fire resistance should not be regarded as unquestionable.In particular, when comparing high-strength concrete with normal-strength concrete, there could be a significant decrease in the strength at high temperatures [2], and since degradation in the bearing force due to spalling [3] can also be expected, it is used in actual constructions only after its load bearing ability and its ultimate strength are confirmed by means of a fire resistance test [4].Generally, the deflection behavior, the cross-sectional temperature and the fire resistance time are measured in the fire resistance test. Although it is essential to understand the distribution of stress on the structural members during fire by constructing a strength formula for the members exposed to fire, since the temperature of the ambient environment can reach 1000°C, the temperature of the members increases significantly as the fire progresses. Naturally, strain gauges tested at ambient temperature become unusable at such high temperatures, and it becomes difficult to explore the stress and the strain in the cross-sectional plane directly through experiments. As a result, the construction of the strength formula for members exposed to fire is considered a challenging task.Mathematical analysis becomes a powerful tool for obtaining the information about stress and strain in the cross-sectional plane that cannot be obtained through fire resistance tests. Moreover, following the expansion of performance design in the field of fireproofing, it is projected that there will be increasingly more opportunities to investigate the fire resistance properties of structural members through mathematical analysis in the future. However, the reliability of mathematical analysis is often questioned, which determines the need for improving the accuracy of the analysis.Since whether the analysis is successful depends strongly on the material model, there is a need to adopt a model which provides an adequate treatment of the mechanical properties and the behavior at high temperatures at the level of the material.The behavior of concrete at high temperatures has been the subject of research for

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Section: Compressive Strength At High Temperaturesmentioning

confidence: 98%

Section: Stress-strain Relationsmentioning

confidence: 99%

Section: Stress-strain Relationsmentioning

confidence: 99%

Section: Stress-strain Relationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Study on Compressive Strength and Strain Behavior of Concrete at High Temperatures<BR>-Chapter 1 Introduction-

Michikoshi

2008

Fire Science and Technology

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A length scale insensitive phase‐field model for fully coupled thermo‐mechanical fracture in concrete at high temperatures

Chen

Zhou

2022

Num Anal Meth Geomechanics

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Fracture in concrete at high temperatures involves complex thermo‐mechanical couplings and arbitrary crack evolution, imposing great challenges to its computational modeling. This work addresses a length scale insensitive phase‐field cohesive model for fully coupled thermo‐mechanical fracture in concrete at high temperatures. Both the thermal expansion and transient creep strain are accounted for in the kinematics. Based on the underlying phase‐field cohesive model for fracture in solids at ambient temperature, the temperature‐dependent mechanical properties of concrete, that is, Young's modulus, tensile and compressive strengths and fracture energy, and so forth, are all incorporated. In addition to the cracking‐induced mechanical damage mechanism represented by the crack phase‐field, the thermal deterioration mechanism is also considered by a temperature‐dependent thermal damage variable. The numerical implementation of the proposed model into the multi‐field finite element method is then briefly addressed. Several representative numerical examples, for example, thermally induced cracking in energy storage structures, thermal shock in quenched concrete plates, mode‐I and mixed‐mode failure of notched beams at high temperatures, and so forth, are presented for the validation. The effects of various expressions for the transient creep strain (TCS) on the global behavior of concrete structures are also studied. As in those purely mechanical problems, both the predicted crack pattern and global responses for all examples are insensitive to the incorporated phase‐field length scale. Being able to capture the fully coupled thermo‐mechanical fracture in concrete, the proposed phase‐field cohesive model, combined with a reliable hydro‐chemo‐thermal analysis, is promising in assessing the integrity and safety of concrete structures at high temperatures like fire scenarios.

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The effect of exposure to elevated temperatures on the fracture energy of plain concrete

Baker

1996

Mat. Struct.

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The high temperature behaviour of concrete under biaxial conditions

Cited by 45 publications

References 0 publications

A Study on Compressive Strength and Strain Behavior of Concrete at High Temperatures<BR>-Chapter 1 Introduction-

A Study on Compressive Strength and Strain Behavior of Concrete at High Temperatures<BR>-Chapter 1 Introduction-

A length scale insensitive phase‐field model for fully coupled thermo‐mechanical fracture in concrete at high temperatures

The effect of exposure to elevated temperatures on the fracture energy of plain concrete

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