Newell Shane, Goggins Jamie
Civil Engineering, School of Engineering, Alice Perry Engineering Building, National University of Ireland Galway, Upper Newcastle, Galway, Ireland.
Department of Building and Civil Engineering, Galway-Mayo Institute of Technology, Galway, Ireland.
Int J Concr Struct Mater. 2018;12(1):66. doi: 10.1186/s40069-018-0287-y. Epub 2018 Oct 5.
Concrete structures expand and contract in response to temperature changes which can result in structural strain and cracking. However, there is a limited amount of robust field data on hybrid concrete floor structures. Shortage of such data impacts on our understanding of how concrete structures respond to thermal effects and ultimately the overall design of concrete structures. Thus, a comprehensive structural and environmental monitoring strategy was implemented by the authors during the construction of an educational building. Sensors were embedded in the precast and in situ components of a hybrid concrete lattice girder flat slab so that the thermal response of the floor during the manufacture, construction and operational stages could be investigated. Many aspects of the thermal behaviour of the floor during the construction phase were monitored using the embedded sensors. The early-age thermal effects during curing and the impact of the variation of ambient temperature (daily and seasonal) and solar radiation on the behaviour of concrete floor is explored in the paper. Values for restraint factors and the in situ restrained coefficient of thermal expansion of concrete are calculated using the data from the embedded sensors. Numerical modelling of the thermal behaviour of the hybrid concrete floor was undertaken and validated using the real-time field measurements. The data presented and analysed in this paper can be used to improve the understanding and modelling of the thermal behaviour of a hybrid concrete floor. This will assist with improved design of sustainable buildings as it allows the environmental performance of the floor to be optimised with respect to controlling the internal environment, thermal mass and energy efficiency.
混凝土结构会随着温度变化而膨胀和收缩，这可能导致结构应变和开裂。然而，关于混合混凝土楼板结构的可靠现场数据数量有限。此类数据的短缺影响了我们对混凝土结构如何响应热效应的理解，进而影响了混凝土结构的整体设计。因此，作者在一座教学楼的建设过程中实施了一项全面的结构和环境监测策略。传感器被嵌入到混合混凝土格构梁平板的预制构件和现浇构件中，以便研究楼板在制造、施工和运营阶段的热响应。利用嵌入式传感器监测了施工阶段楼板热行为的许多方面。本文探讨了养护期间的早期热效应以及环境温度（每日和季节性）变化和太阳辐射对混凝土楼板性能的影响。使用嵌入式传感器的数据计算了约束系数和混凝土的现场约束热膨胀系数。对混合混凝土楼板的热行为进行了数值模拟，并通过实时现场测量进行了验证。本文所呈现和分析的数据可用于增进对混合混凝土楼板热行为的理解和建模。这将有助于改进可持续建筑的设计，因为它可以在控制内部环境、热质量和能源效率方面优化楼板的环境性能。
