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

doi:10.11896/cldb.22060083

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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.

Key words： steel-PVA hybrid fiber reinforced cementitious composite (HFRCC) permanent formwork short-term stiffness stiffness analysis method effective moment of inertia method

Published: 10 February 2024 Online: 2024-02-19

CLC number:

TU528.572

Fund:National Natural Science Foundation of China (51278402,12202334), the Natural Science Basic Research Program of Shaanxi (2023-JC-QN-549, 2022JQ-427), and the Postdoctoral Research Project of Shaanxi (2023BSHEDZZ269).

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	WANG Zhaoyao
	LIANG Xingwen
	ZHAI Tianwen
	WANG Ying
	WU Kui

Cite this article:

WANG Zhaoyao,LIANG Xingwen,ZHAI Tianwen, et al. Calculation Method for Short-term Stiffness of RC One-way Slabs with HFRCC Permanent Formwork[J]. Materials Reports, 2024, 38(3): 22060083-9.

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http://www.mater-rep.com/EN/10.11896/cldb.22060083 OR http://www.mater-rep.com/EN/Y2024/V38/I3/22060083

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