Mechanical performance test and analysis of prestressed lightweight aggregate concrete hollow slab

Abstract

To investigate the mechanical performance of prestressed lightweight aggregate concrete hollow slabs, a symmetric loading test was performed on eight prestressed concrete hollow slabs categorised into four groups based on their variety of coarse aggregate concrete and span, and their respective failure mode, bearing capacity, deformation performance and crack propagation were analysed. Based on the test data, a simulation model was subsequently established to simulate and analyse the test components. The test results showed that the bending process of the prestressed lightweight aggregate concrete hollow slab goes through three stages: elasticity, elasto-plasticity and plasticity. Furthermore, its bearing capacity and failure characteristics are similar to those of a prestressed ordinary concrete hollow slab. Subsequently, we derived a formula for checking the calculation of crack width by introducing a comprehensive influence coefficient of concrete Cm and combining it effectively with the formula in the current code and verified its efficacy. The calculated value of the formula agrees well with the test results, providing a reference for the application of engineering and a supplementary calculation formula for the crack width of lightweight aggregate concrete hollow slabs.

Flexural Capacity and Behavior of RC Hollow Bridge Beams after a Time Service of 24 Years

“…Based on the following three basic assumptions, the ultimate flexural capacity of the normal section of the concrete hollow slab was calculated [27]: Figure 19.…”

Flexural behavior of two-layer reinforced concrete slab with hollow cores

“…2 Use of an HCS system offers many advantages, including reduced overall weight and cost, easier free space partitioning, the ability to use polystyrene foam to fill voids for thermal and sound insulation, the capacity of the high-strength HCS to bear heavy loads, ease of use for mechanical, electrical, and plumbing services, and reduced vibration when HCS structures are used in tall buildings. 4–8 The flexural performance of the HCS has been studied with respect to several different parameters, and the results indicate that the maximum load and deflection of a circular HCS are greater than those of a square-shaped HCS; in addition, increasing the compressive strength improves both the ultimate and cracking loads of the structure; the ultimate capacity improves and the deflection is reduced for these slabs when tested under uniform loads when compared with slabs tested under two-point loads; and elimination of the top steel reinforcement also reduces the ultimate load. 9 The behavior of a bubbled slab with dimensions of 1850×460×110 mm 3 was studied when recycled plastic balls were used to prepare the bubbles, and the results illustrated that the stiffness reduction factor of the bubbled slabs was approximately 0.87, which reduced its failure load; the cracking load was also reduced simultaneously by increasing yield deflection, and use of plastic balls weighing 1 kg eliminated 460 kg of concrete, thus reducing material consumption.…”

Structural behavior of Lightweight and High strength Layered Hollow Core Slabs

“…hollow core slab (HCS) is defined as a simply supported concrete slab with about (40%-50%) voids in the center of the slab cross section through its length in one direction with a typical diameter of (.667-.75) of the slab thickness, a typical width of 120 cm, a typical thickness of about (15-50) cm, and the clear span reaches up to 18m [1][2][3][4]. There are many advantages of using HCS, like reducing overall weight, saving cost and time of construction, providing long spans, and increasing fire resistance [5][6][7][8]. The shear span to effective depth (a/d) ratio affects the mode of failure of the HCS and changes it from a flexural to a shear mode [9].…”