Early age tensile creep of high performance concrete containing mineral admixtures: Experiments and modeling

Gu, Chengfan; Wang, Yicong; Gao, Fan; Yang, Yang; Ni, Tongyuan; Liu, Jintao; Lou, Xiaotian; Chen, Jin

doi:10.1016/j.conbuildmat.2018.11.218

Cited by 37 publications

(23 citation statements)

References 30 publications

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“…e tensile creep tests were performed using the test device developed by Yang et al [23,[28][29][30][31][32].…”

Section: Tensile Creep Measurement Experimentmentioning

confidence: 99%

“…e autogenous shrinkage test method without load ( Figure 4) was performed with the same method that was presented in Gu et al [23] and Ni et al [32]. e autogenous shrinkage deformation was measured by a high-precision displacement sensor (whose accuracy is 0.001 mm).…”

Section: Tensile Creep Measurement Experimentmentioning

confidence: 99%

“…Creep. Several literatures [3,[23][24][25][26][27][28][29][30][31][32][33] had shown that loading age had a very prominent impact on the early-age creep of concrete. Some research [29,30] results showed that the tensile creep of high-strength concrete containing admixtures was also strongly influenced by the loading age.…”

Section: Influence Of Loading Age and Admixtures On Tensilementioning

confidence: 99%

“…e mineral admixtures had been widely used to ameliorate early cracking sensitivity of HSC [15][16][17]. Several researchers [17][18][19][20][21][22][23] investigated the tensile creep properties of HSC containing admixtures at the early age, but the research progress could not keep up with the pace of engineering applications. With the practical demand, it is urgent to reveal the tensile creep behaviors of HSC, especially the early-age tensile basic creep, so as to provide the basis for the stress analysis, cracking control, and engineering application of HSC at the early age.…”

Section: Introductionmentioning

confidence: 99%

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Early‐Age Tensile Basic Creep Behavioral Characteristics of High‐Strength Concrete Containing Admixtures

Yang

et al. 2019

Advances in Civil Engineering

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Tensile creep is an important parameter to evaluate cracking probability of high-strength concrete (HSC) structure, and the mineral admixtures have great effect on it. In this paper, the early-age tensile basic creep behaviors of HSC containing fly ash (FA) and blast furnace slag (BS) were investigated by experiments, and the influences of loading age and stress level (stress-strength ratio of initial loading) were evaluated. The results showed that FA promoted the early-age tensile basic creep while BS inhibited the early-age tensile creep. Moreover, the influence of loading age on early-age tensile basic creep of HSC was more significant, and the affected ages’ duration was longer than that of plain concrete. The early-age tensile basic creep of HSC containing admixtures also showed linear creep characteristic after a certain age as HSC without admixtures, and the linear characteristic was more obvious at a later loading age. The tensile basic creep velocity of HSC containing FA was the highest, while HSC containing BS exhibited the lowest velocity. The influence of admixtures on velocities of tensile basic creep was gradually attenuated with the age growth in holding period.

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“…e tensile creep tests were performed using the test device developed by Yang et al [23,[28][29][30][31][32].…”

Section: Tensile Creep Measurement Experimentmentioning

confidence: 99%

Section: Tensile Creep Measurement Experimentmentioning

confidence: 99%

Section: Influence Of Loading Age and Admixtures On Tensilementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Early‐Age Tensile Basic Creep Behavioral Characteristics of High‐Strength Concrete Containing Admixtures

Yang

et al. 2019

Advances in Civil Engineering

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“…Recently, a new model B4 has been proposed, which is an extension and systematic recalibration of the theoretically founded model B3 in the recommendation of RILEM and can overcome some of the shortcomings of the CEB‐FIB, ACI, JSCE, and GL prediction models for concrete creep and shrinkage. Except the new B4 model, some other researches are also conducted to improve and confine the recognition of the shrinkage and creep of concrete.…”

Section: Introductionmentioning

confidence: 99%

Vertical shortening prediction for super‐tall buildings considering enclosure effect and coupling effect

Zhao

Wang

2019

Structural Design Tall Build

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In this paper, the time-dependent vertical shortening behavior of the super-tall building is studied considering the enclosure effect and the coupling effect. A combined method to predict the overall strain of the mega section is firstly proposed by combining the B3 model and the fiber modeling approach to consider the enclosure effect of mega steel and validated by a series of in-house experiments. An iteration method is then proposed based on the construction sequence method to consider the coupling effect of stress and strain in the vertical shortening prediction and illustrated by a super-tall building project. Finally, the vertical shortening predictions of the super-tall building project are compared with the field monitoring records. The resultsshow that the strain predictions by the combined method show good agreement with experiments. Without considering the enclosure effect, the overall strain of mega section is overestimated. The coupling effect affects more on the vertical shortening of the mega column than on that of the shear wall and more on the elastic shortening than on the inelastic shortening. Without considering the coupling effect, the elastic shortening is significantly underestimated in the mega column but slightly overestimated in the shear wall. The predictions of vertical shortening in the shear wall show reasonable agreement with the measurements, whereas those in the mega column show large disagreement with the measurements, which enlightens the necessity to improve the prediction method further. KEYWORDS a combined method, an iteration method, coupling effect, enclosure effect, super-tall building, vertical shortening | INTRODUCTIONIn the past decades, the outrigger structural system has proven to be an efficient lateral stiffness system to reduce the lateral drift under the wind or seismic loading and widely adopted in super-tall buildings. However, this structural system suffers from the excessive stress to the structural members under the time-dependent actions, such as the shrinkage and creep. Vertical shortening is one of the major considerations in the design and construction of super-tall buildings. The differential vertical shortening could cause adverse effects on the nonstructural elements of buildings, such as the curtain walls, partitions, electrical pipelines, and elevators and may also result in redistribution of structural member forces.The vertical shortening prediction of super composite components mainly contains two aspects. The one is the model utilized to predict shrinkage and creep, which is kind of material-level issue, whereas the other one is related to the structure-level issue, that is, how to deal with the composite structural components. Shrinkage and creep are the natural characteristics of concrete along with the formation, the development, and

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A study of differential foundation settlement of piled raft and its effect on the long‐term vertical shortening of super‐tall buildings

Wang

Zhao

Liu

2021

Structural Design Tall Build

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Summary In this study, the long‐term differential foundation settlement and vertical shortening of super‐tall buildings are investigated considering the coupling effect. At first, a time‐dependent settlement model is proposed to predict the foundation settlement based on the construction sequence method, in which both soil compression and pile shortening are considered. The pile shortening including the elasticity, shrinkage, and creep contributes to the most settlement of a single pile. The distribution of foundation settlement of piled raft is pot shaped with a large value in the core while small values in the surroundings. A time‐dependent soil‐foundation‐structure system is then developed using a series of equivalent springs to represent the distributed foundation settlements, by which the vertical shortenings of shear wall and mega column are predicted considering the coupling effect and moisture distribution. The pot‐shaped distribution of foundation settlement of piled raft leads to the decrease of vertical shortening for shear wall while the increase of vertical shortening for mega column, especially in the low stories. Finally, some health monitoring records of the Shanghai Tower are applied to validate the proposed time‐dependent settlement model and soil‐foundation‐structure system. The predicted foundation settlements show reasonable agreement with the monitoring records. The predicted vertical shortenings with considering the differential foundation settlement agree better with measurements than those without considering the differential foundation settlement.

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Early age tensile creep of high performance concrete containing mineral admixtures: Experiments and modeling

Cited by 37 publications

References 30 publications

Early‐Age Tensile Basic Creep Behavioral Characteristics of High‐Strength Concrete Containing Admixtures

Early‐Age Tensile Basic Creep Behavioral Characteristics of High‐Strength Concrete Containing Admixtures

Vertical shortening prediction for super‐tall buildings considering enclosure effect and coupling effect

A study of differential foundation settlement of piled raft and its effect on the long‐term vertical shortening of super‐tall buildings

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