Abstract
The composite slab with steel trusses is composed of precast bottom plate and cast-in-place concrete. In engineering applications, cracks often appear in the bottom plate before casting the upper concrete, which even leads to the failure of the composite slab. To improve the crack resistance of the slab, a composite slab with additional steel trusses is proposed; that is, on the basis of the original longitudinal steel trusses, the transverse steel trusses are added. Static test and numerical analysis were carried out on the bottom plate of the new type of composite slab with the additional transverse steel trusses. The experimental and analytical results show that the load level of the plate with additional steel trusses can be increased by 33% under the normal service limit state; the deflection of the plate is significantly reduced and the crack development is effectively controlled, which illustrates that the new type of composite slab can improve the bearing capacity, increase the bending stiffness, and enhance the crack resistance effectively.
Highlights
In the engineering application, it is often found that the bottom plate cracks before field installation, especially the wide plate, resulting in the composite slab failing to be used
Test Preparation and Process. ree bottom plates with different forms were made by experiment to study the mechanical properties and cracking characteristics contrastively, which serial numbers are DHB1, DHB2, and DHB3. e first plate, DHB1, is the bottom plate of B90 composite slab with one-way steel trusses, which is commonly used in the design atlas “reinforced concrete composite slab with steel trusses” (15G366-1)
300 300 cushion block displacement meter C1, C2 strain gage (a). It can be seen from the above test that, for DHB1 and DHB2 with the same thickness of 60 mm, DHB2 added the lateral additional steel trusses, which load was increased by 33% compared with DHB1 in the serviceability limit state
Summary
In the engineering application, it is often found that the bottom plate cracks before field installation, especially the wide plate, resulting in the composite slab failing to be used.
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