Calculation Method for Short-term Stiffness of RC One-way Slabs with HFRCC Permanent Formwork

被引：0
|
作者：
Wang Z. [1 ]
Liang X. [2 ]
Zhai T. [2 ,3 ]
Wang Y. [2 ]
Wu K. [1 ]
机构：
[1] School of Science, Xi’an University of Architecture and Technology, Xi’an
[2] School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an
[3] The Third Construction Co.,Ltd., China Construction Eighth Engineering Division, Nanjing
来源：
Cailiao Daobao/Materials Reports | 2024年 / 38卷 / 03期
基金：
中国国家自然科学基金;
关键词：
effective moment of inertia method; permanent formwork; short-term stiffness; steel-PVA hybrid fiber reinforced cementitious composite (HFRCC); stiffness analysis method;
D O I：
10.11896/cldb.22060083
中图分类号：
学科分类号：
摘要：
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. © 2024 Cailiao Daobaoshe/ Materials Review. All rights reserved.
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