Early-age creep behavior of concrete-filled steel tubular members subjected to axial compression

Jiao, Yu-Ying; Han, Bing; Xie, Huibing; Zhu, Li; Zhou, Lidong

doi:10.1016/j.jcsr.2020.105939

Cited by 8 publications

(6 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The trend is similar to that in Figure 8. It can be seen that the test results in Jiao et al (2020) is significant larger than the test results in this study due to ignoring the effect of sustained loading at early age. The proposed model shows the best agreement with experimental outcomes, and the fib (2012) model shows the largest deviation.…”

Section: Parameter Regression and Model Validationcontrasting

confidence: 60%

“…According to the experimental results, the strength and elastic modulus of concrete decrease under early-age loading, indicating that the decreasing effect of 2-h early-age loading on the compressive strength and elastic modulus of concrete is dominant. It can be observed from Figures 8 and 9 that the test results in Jiao et al (2020) are significant larger than that of this study due to ignoring the effect of sustained loading at early age, which demonstrates that early-age and sustained loads are two major factors that must be considered in modeling concrete strength and elastic modulus development.…”

Section: Discussionmentioning

confidence: 56%

“…The CEB-FIP model with sustained loading provide good accuracy at early stage, but over predicts the strength at 28 days. CEB-FIP model without sustained loading, significantly over predicts the compressive strength development but is most close to the test results in Jiao et al (2020), which does not consider the influence of sustained load at early age, either. Therefore, in terms of 28 days compressive strength, CEB-FIP models provide non-conservative results, while proposed model can provide more accurate predictions.…”

Section: Parameter Regression and Model Validationmentioning

confidence: 54%

“…Predictions from the proposed model and the predictions from CEB-FIP Model Code ( fib , 2012) without ( fib , 2012) and with ( fib , 2012 sus) sustained load are compared with the test results in Jiao et al (2020) and test results of specimens “A” in this experiment in Figure 8. Proposed model shows the best agreement with the data, which is expected as the same data was used to determine the model parameters.…”

Section: Parameter Regression and Model Validationmentioning

confidence: 99%

“…Figure 9 compares the experimental elastic modulus with fib (2012), fib (2012) sus, test results in Jiao et al (2020), and proposed model. The trend is similar to that in Figure 8.…”

Section: Parameter Regression and Model Validationmentioning

confidence: 99%

See 4 more Smart Citations

Development of strength and elastic modulus of concrete sealed in steel tube under sustained load at early age

Jiao

Han

Xie

et al. 2020

Advances in Structural Engineering

Self Cite

View full text Add to dashboard Cite

Concrete-Filled Steel Tubular Structures (CFSTSs) have become popular among the structural engineering community due to significantly higher load carrying capacity compared to conventional reinforced-concrete structures. Much research has been conducted on understanding the behavior of CFSTSs under various loading conditions and design theories have been established to predict the load carrying capacities of such structures. However, existing models do not consider the effects of sustained early loads on concrete strength and elastic modulus development of CFSTSs. With the need for rapid construction, CFSTSs may be subjected to loading at an early stage before concrete is fully cured. Such early loading may incur negative effects on strength and elastic modulus development of concrete within the confined environment. This paper propose theoretical models based on the compressive packing model (CPM) to simulate strength and elastic modulus development of early-age concrete under sustained stress. Development of concrete properties at early age is described using Hydration kinetics, and maximum paste thickness in the CPM model is modified using energy conservation to simulate sustained loads. Early concrete strength and the elastic modulus development rules were investigated experimentally for sustained loads. Predictions from the proposed models are compared with conventional models from CEB-FIP Model Code. Results showed that when loaded at a very early stage, a relatively high stress to strength ratio will result in causing damage in concrete. Such damage significantly affects the strength and elastic modulus development. Compared with concrete loaded at 28 days, concrete loaded at early stages showed significant reduction in concrete strength and elastic modulus.

show abstract

Section: Parameter Regression and Model Validationcontrasting

confidence: 60%

Section: Discussionmentioning

confidence: 56%

Section: Parameter Regression and Model Validationmentioning

confidence: 54%

Section: Parameter Regression and Model Validationmentioning

confidence: 99%

“…Figure 9 compares the experimental elastic modulus with fib (2012), fib (2012) sus, test results in Jiao et al (2020), and proposed model. The trend is similar to that in Figure 8.…”

Section: Parameter Regression and Model Validationmentioning

confidence: 99%

See 3 more Smart Citations