Experimental studies on shear behaviour of fiber reinforced prestressed concrete hollow core slabs at ambient and under fire conditions

• Main Author: Goh, Begonia Wei Lyn
• Other Authors: Tan Kang Hai
• Format: Final Year Project
• Language: English
• Published: 2019
• Subjects: DRNTU::Engineering::Civil engineering
• Online Access: http://hdl.handle.net/10356/77965
• Institution: Nanyang Technological University

Precast concrete was pioneered in the early 20th century. Since then, precast concrete is commonly used in construction. The process of producing precast concrete involves casting in a mould followed by curing in a controlled environment, thereby ensuring quality of the concrete as compared to casting and curing on-site. Following is the introduction of precast, prestressed concrete hollow core (PCHC) slabs, and they are widely used due to the benefits it brings about. Due to its fabrication restraint, the provision of shear reinforcement is restricted and therefore the shear capacity of PCHC slabs is dependent solely on the concrete’s tensile strength to resist shear force (Meng, 2016). Under fire conditions, the load bearing capacities of PCHC slabs substantially decrease as a result of the degradation of material properties and thermal stresses, which is more crucial for deeper units (greater than 300mm in depth). Previous studies have shown that at ambient conditions, some deep PCHC slabs failed in web-shear at less than 60% of the shear capacity predicted by using American Concrete Institute’s (ACI’s) Building Code Requirements for Structural Concrete ACI 318-05, overestimating the shear capacities of deep PCHC slabs. As such the motivation of this research is to evaluate the effectiveness of reinforced PCHC slabs at both ambient and under fire conditions.