Bending performance test and bending stiffness calculation of lightweight-composite slabs with different construction form(PDF)

¡¶½¨Öþ¿ÆѧÓ빤³Ìѧ±¨¡·[ISSN:1673-2049/CN:61-1442/TU]

Issue:

2026Äê01ÆÚ

Page:

183-194

Research Field:

½¨Öþ½á¹¹

Publishing date:

Info

Title:

Bending performance test and bending stiffness calculation of lightweight-composite slabs with different construction form

Author(s):

QUAN Wenli¹;  HUANG Wei¹;  MIAO Xinwei²; 3;  AN Yongjiannan¹;  FENG Yuan¹

£¨1. College of Civil Engineering, Xi¡¯an University of Architecture and Technology, Xi¡¯an 710055, Shaanxi, China;

2. School of Science, Xi¡¯an University of Architecture and Technology, Xi¡¯an 710055, Shaanxi, China;?

3. Postdoctoral Research Station of Materials Science and Engineering, Xi¡¯an University of? Architecture and Technology, Xi¡¯an 710055, Shaanxi, China£©

Keywords:

lightweight composite slab;  bending stiffness;  sand aerated concrete;  truss steel bar;  fiber;  high ductility concrete

PACS:

TU375.2

DOI:

10.19815/j.jace.2024.10075

Abstract:

In response to the demand for lightweight development of prefabricated concrete components, a type of lightweight composite slab was proposed by combining ordinary concrete composite slabs with sand aerated concrete materials. In order to study the bending performance of this type of lightweight composite slab and establish its bending stiffness calculation formula, four point bending tests were conducted to analyze the effects of prefabricated bottom plate material, truss steel bar configuration, and high ductility concrete lining on the failure mode, flexural bearing capacity, bending stiffness, and other bending properties of the composite slab. Based on the experimental results, a formula for calculating the shortª²term bending stiffness of this type of lightweight composite slab under different stress stages was proposed. The results show that the truss steel bar effectively improves the shear resistance and ultimate bending capacity of the composite surface of lightweight composite slab. When 0.4% carbon fiber and ª©0.4ªª% basalt fiber are added to the prefabricated bottom plate without setting high ductility concrete lining, the bending stiffness and bearing capacity of the composite slab are improved to varying degrees, but the carbon fiber reinforcement effect is more significant. When setting high ductility concrete lining for prefabricated bottom plates, there is little difference in the influence of carbon fiber and basalt fiber on the bending stiffness and bearing capacity of composite slab. The order of influence on the bending performance of the lightweight composite slab from large to small is truss steel bar, fiber, and lining plate construction. The calculation results of the established shortª²term bending stiffness formula is in good agreement with the experimental results.

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