Design, Construction and Testing of a Low Carbon Thin-Shell Concrete Flooring System
Design, Construction and Testing of a Low Carbon Thin-Shell Concrete Flooring System
复制标题
低碳薄壳混凝土地坪系统的设计、施工和测试
DOI：
10.1016/j.istruc.2018.10.006
复制
发表时间：
2019
期刊：
影响因子：
4.1
通讯作者：
Hawkins W
中科院分区：
文献类型：
--
作者：
Hawkins W
全球快速城市化和人口增长正在推动建筑建设达到前所未有的水平，预计未来40 年全球总建筑面积将几乎翻一番。由于建筑中的大部分结构材料都存在于楼层中，这为结构工程师提供了一个重要的机会，为更可持续的建筑业做出贡献。本文研究了一种由纺织钢筋混凝土外壳和泡沫混凝土填充组成的新型地板系统，该系统有可能将建筑物整个结构中的材料数量减半。描述了一种新的设计和几何优化方法，以及两个原型的建造和测试，每个原型厚18 mm，跨度2 m，高200 mm。这些纺织钢筋混凝土壳体的非常规之处在于，它们的总深度低，钢筋含量低，并且缺乏刚性支撑。这两个都是用AR玻璃纤维织物加固的，使用细粒混凝土建造的，但只有一个采用泡沫混凝土填充。每一个都在不对称载荷下进行了破坏测试。在这两种情况下，都形成了铰链式坍塌机制，而不是突然的灾难性破坏，这对安全性和健壮性具有积极的意义。建立了一个非线性有限元模型，很好地再现了观测到的行为，包括开裂模式。对手工施工方法产生的几何误差进行了测量，并对其结构影响进行了评估，发现其对结构的影响很小。调查证实了结构体系的强度、健壮性和可建造性，并建立了可靠的分析方法。
Rapid global urbanisation and population growth is driving unprecedented levels of building construction, with the total worldwide floor area expected to almost double over the next 40 years. Since most of the structural material in a building exists within the floors, these present a significant opportunity for structural engineers to contribute to a more sustainable construction industry.This paper examines a novel flooring system of textile-reinforced concrete shells with a foamed concrete fill, which has the potential to halve the amount of materials in a building's entire structure. A new design and geometry optimisation method is described, as well as the construction and testing of two prototypes; each 18 mm thick, 2 m in span and 200 mm tall. These textile-reinforced concrete shells are unconventional in their low total depth, low reinforcement content and lack of rigid supports. Both were reinforced with AR-glass fibre textile and constructed using fine-grained concrete, however only one featured a foamed concrete fill. Each was tested to destruction under an asymmetric load. In both cases, a hinged collapse mechanism was formed rather than sudden catastrophic failure, with positive implications for safety and robustness.A non-linear finite element model was developed which replicated the observed behaviour well, including cracking patterns. Inaccuracies in geometry arising from the hand-made construction methods were measured and their structural impact was assessed and found to be small.The investigations confirm the strength, robustness and buildability of the structural system, and establish a reliable analysis method.