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- aggregation classification "C1".
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- aggregation date "2014".
- aggregation format "application/pdf".
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- aggregation isPartOf urn:isbn:978113800120-6.
- aggregation language "eng".
- aggregation publisher "CRC Press".
- aggregation rights "I have transferred the copyright for this publication to the publisher".
- aggregation subject "Technology and Engineering".
- aggregation title "Creep experiments and analysis of T-shaped beams subjected to loading and unloading at young age".
- aggregation abstract "Creep and shrinkage are important time-dependent phenomena to consider when designing reinforced concrete structures. Depending on the concrete age, the loading history (sequence and timing), the dimensions of the structural elements and environmental factors, the creep deflection can be more than two times larger than the elastic deflection. This, off course, can lead to unacceptable deflections of the structure or instability problems leading to failure. Creep under a sustained load is a well-studied phenomenon. However, many structures are subjected to changes in the loading due to construction activities. Typically the quasi-permanent load combination is used to predict the long-term deformation in a creep analysis without taking the load history into account. This approach has been proven useful, however, it does not allow for the prediction of the deformations considering the rather important early age creep of the structure. Creep rate decreases with an increase of the hydration degree, meaning that concrete is more susceptible to creep at young age. Furthermore, the expected loading history of a structural element should be considered in the design, since this strongly influences the point at which cracking of the element will occur, leading to a reduced stiffness of the element. In order to investigate creep deformation caused by load changes at young age and its effect on the long-term deformation a series of T-shaped beams has been subjected to different load scenarios. An overview of the measurement results is given as wall a cross-sectional numerical procedure to estimate the creep deformation due to the loading history during construction.".
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