Calculation Method for Short-term Stiffness of RC One-way Slabs with HFRCC Permanent Formwork
WANG Zhaoyao1,*, LIANG Xingwen2, ZHAI Tianwen2,3, WANG Ying2, WU Kui1
1 School of Science, Xi'an University of Architecture and Technology, Xi'an 710055, China 2 School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China 3 The Third Construction Co., Ltd., of China Construction Eighth Engineering Division, Nanjing 210000, China
Abstract: Steel-PVA hybrid fiber reinforced cementitious composite (HFRCC) has great tensile toughness and durability, which is an ideal material for permanent formwork. First, the effect of PVA fiber content on the workability and flexural strength of HFRCC was explored. The results showed that with the increase of PVA fiber content, the workability was significantly weakened, while the flexural strength first increased and then decreased. The HFRCC containing 1.5% steel fiber and 0.25% PVA fiber was adopted to make permanent formwork. Then, four-point bending tests were carried out on six RC slabs with HFRCC permanent formwork (composite slabs) and one RC slab to explore the effect of HFRCC-RC interface treatments and reinforcement ratio on the flexural behavior of composite slabs. The test results showed that the influence of three HFRCC-RC interface treatments on the flexural behavior of composite slabs was basically negligible; the HFRCC formwork can effectively limit the development of cracks, reduce the crack width and crack spacing, the cracking moment of composite slabs was increased by 20.1%—31.7% compared with the RC slab. The stiffness analysis method and the effective moment of inertia method were adopted to establish the calculation method of the short-term stiffness of the HFRCC-RC composite slabs. Both methods had high calculation accuracy and small discreteness.
通讯作者:
*王照耀,西安建筑科技大学理学院讲师。2022年天津大学结构工程专业博士毕业。目前主要从事纤维增强水泥基复合材料及其应用方面的研究工作。主持和参与国家级和省部级科研项目6项;发表科研论文20余篇,包括Construction and Building Materials、Structures、Structural Concrete、《土木工程学报》等。wzy@xauat.edu.cn
引用本文:
王照耀, 梁兴文, 翟天文, 王莹, 吴奎. 钢-PVA混杂纤维增强水泥基复合材料永久模板叠合RC单向板短期刚度计算方法[J]. 材料导报, 2024, 38(3): 22060083-9.
WANG Zhaoyao, LIANG Xingwen, ZHAI Tianwen, WANG Ying, WU Kui. Calculation Method for Short-term Stiffness of RC One-way Slabs with HFRCC Permanent Formwork. Materials Reports, 2024, 38(3): 22060083-9.
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2024, Vol. 38 
