Load-defl ection behaviour of hybrid concrete flat slab

Ragheed Makki, H. Al-Katib, Ahmed A. Alalikhan
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引用次数: 1

Abstract

Due to the important role of high strength concrete in the structural systems, present work focuses on the use of this material as a strengthening technique incorporating with the normal strength concrete in flat slab system. Eight simply supported flat slab models with (1,000 × 1,000 × 120 mm) dimensions are investigated based on three groups including normal strength concrete and high strength concrete. The first group represents models containing of two flat slabs fully with one type of concrete; NSC and HSC as control flat slab. The second and third groups consist of six flat slabs as hybrid flat slabs of two layer of concrete with different thicknesses. Concrete mixture HSC was used in tension zone in three hybrid flat slabs (second group) with three thicknesses (30, 60 and 90 mm), while the remaining three hybrid flat slabs (third group) was used the HSC in compression zone with the same previous thicknesses. The experimental results shown that the ultimate load increased about (19.4%) when HSC was used fully (hH / h = 1) instead of using NSC in the control flat slab (NSC slab). The hybrid flat slabs with use HSC in compression zone showed higher in cracking and ultimate flexural loads compared with those of the hybrid flat slabs with use HSC in tension zone and also were stiffer in load-defl ection curve with the hybrid flat slabs with HSC in tension zone, also the hybrid flat slabs showed an improvement in the cracking load and ultimate flexural load when increasing the thickness of the HSC layer (hH / h) in both tension and compression zone as compared to control flat slab (NSC slab).
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混合混凝土平板的荷载变形特性
由于高强混凝土在结构体系中的重要作用,目前的工作重点是将这种材料作为一种与普通强度混凝土结合在平板体系中的加固技术。研究了8个尺寸为(1000 × 1000 × 120 mm)的简支平板模型,分别采用普通强度混凝土和高强混凝土三组。第一组模型包含两块完全由一种类型的混凝土构成的平板;NSC和HSC作为控制平板。第二组和第三组由6个平板组成,作为两层不同厚度混凝土的混合平板。混凝土混合料HSC在受拉区(第二组)采用三种厚度(30,60和90mm)的混合平板,其余三块混合平板(第三组)采用相同厚度的受压区HSC。试验结果表明,在对照平板(NSC板)中充分使用HSC (hH / h = 1)而不使用NSC时,极限荷载提高了约19.4%。受压区使用高筋混凝土的混合楼板的开裂荷载和极限弯曲荷载均高于受拉区使用高筋混凝土的混合楼板,且在荷载-挠曲曲线上比受拉区使用高筋混凝土的混合楼板更刚性。同时,随着受拉区和受压区HSC层厚度(hH / h)的增加,与对照板(NSC板)相比,复合板的开裂荷载和极限弯曲荷载均有所改善。
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来源期刊
Scientific Review Engineering and Environmental Sciences
Scientific Review Engineering and Environmental Sciences Earth and Planetary Sciences-Earth-Surface Processes
CiteScore
1.50
自引率
0.00%
发文量
24
审稿时长
26 weeks
期刊介绍: Scientific Review Engineering and Environmental Sciences [Przegląd Naukowy Inżynieria i Kształtowanie Środowiska] covers broad area of knowledge and practice on fields such as: sustainable development, landscaping of non-urbanized lands, environmental engineering, construction projects engineering land management, protection and land reclamation, environmental impact of investments, ecology, hydrology and water management, ground-water monitoring and restoration, geotechnical engineering, meteorology and connecting subjects. Authors are welcome to submit theoretical and practice-oriented papers containing detailed case studies within above mentioned disciplines. However, theoretical papers should contain part with practical application of the theory presented. Papers (in Polish or English languages) are accepted for publication after obtaining positive opinions of two reviewers. Papers published elsewhere are not accepted.
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