Prestressed hollow slab with variable rib widths

Abstract

The invention relates to a reinforced concrete hollow floor system structure, particularly relates to a prestressed hollow slab with variable rib widths and a method for constructing the prestressed hollow slab, and belongs to the field of common building structures. The prestressed hollow slab comprises upper-layer slab reinforcing steel bars (1), lower-layer slab reinforcing steel bars (2), rib beams (3), prestressed bars (4), filling materials (5) and concrete (6). The filling materials (5) are positioned between the upper-layer slab reinforcing steel bars (1) and the lower-layer slab reinforcing steel bars (2) and are permanently buried in the concrete, the prestressed hollow slab is divided into a rib beam standard region (9) and two rib beam narrowing regions (10) by region boundaries (8), the total width of the rib beam standard region is larger than or equal to 1 / 3 of the span of the prestressed hollow slab in long-span directions, the widths of the rib beams in the rib beam narrowing regions are smaller than or equal to those of the rib beams in the rib beam standard region, and the quantities of the prestressed bars in the rib beams in the rib beam narrowing regions are smaller than the quantity of the rib beams in the rib beam standard region. The prestressed hollow slab and the method have the advantages that the prestressed hollow slab is wide in span, good in structural reliability and earthquake resistance and excellent in economical efficiency and applicability and is light.

Description

(1) Technical field [0001] The invention relates to a reinforced concrete hollow floor structure, in particular to a prestressed hollow slab with variable rib width and a construction method thereof, belonging to the field of general building construction. (2) Background technology [0002] In the field of construction, with the increasing number of long-span concrete structures, more and more floor slabs adopt hollow-core floor structure technology. When the span of the floor exceeds a certain value (such as 16 meters) or the load exceeds a certain value (such as the dead load plus live load other than the self-weight of the slab exceeds 20KN / m 2 ), the use of prestressed hollow slabs can achieve better technical results. [0003] In January 2003, I and my colleagues put forward the "prestressed cast-in-place slab filled with special-shaped cross-section lightweight material" (ZL03236988.3). In 2004, this technology was applied to the 2008 Olympic shooting hall project. Th...

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Problems solved by technology

[0004] However, these technologies have the following defects: the prestressed tendons are arranged in the rib beam, but the number of prestressed tendons in the same direction in the rib beam remains unchanged; the width of the rib beam also remains unchanged

However, using the finite element method to analyze the two-way plate, it can be found that the maximum bending moment only appears in the middle strip, and the mid-span bending moment difference of different parts on the middle strip is small, while in the area close to the support, the mid-span bending moment poor attenuation

In these areas, the reinforcement is reinforced according to the maximum bending moment value, which obviously wastes a lot

[0006] To sum up, in the existing technology, there is no two-way slab technology that can give full play to the maximum advantages of prestressed and hollow slabs. Therefore, the development of prestressed hollow two-way slab technology with large hollow ratio and less reinforcement, has become an urgent problem to be solved

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