THE FEATURES OF STRUCTURAL CONCEPT AND DESIGNING OF THE FULL-LENGTH EXPERIMENTAL MODULE OF THE COMPOSITE STEEL AND CONCRETE GRID-CABLE ROOFJournal: Academic Journal "Industrial Machine Building, Civil Engineering" (Vol.1, No. 46)
Publication Date: 2016-04-29
Authors : Storozhenko L.; Gasii G.;
Page : 51-59
Keywords : composite steel and concrete; slab; lattice; cable; bolt.;
The modern conditions in the construction industry have caused the implementation of new designs, composition of which provides economic benefit through the efficient use of materials. It is about the experimental model of the composite steel and concrete grid-cable roof. The model has a span 8.6 m and includes a lattice, the top and bottom belts. It consists from seven modules with dimensions of 1,25 × 1,25 m and a height of 0,57 m. The effect of material savings achieved through reinforced concrete slab, which has thickness of 6 cm and used as the top belt, steel rope that has diameter of 16 mm and used as the bottom belt. In addition, when use the reinforced concrete slab as compressed element of the top belt then it makes possible to reduce the overall consumption of steel and abandon from labor-intensive and expensive roofing works, because the concrete slab is a bearing and covering construction. Review of recent researches and publications has showed that the composite steel and concrete is a material that has a wide field for using in various sectors of construction. No exception is the roof structure for industrial and public buildings and largespan structures. The main part of researches has been devoted to the study of stress-strain state of individual elements or roof small-scale samples. The analysis of previous works has showed that full-size composite steel and concrete grid-cable roof samples has not been studied, so development drawings of specimens and experimental research methods is an urgent problem. Using the results of previous studies were developed prototype drawings of roof and prepared the basic provisions of the method of experimental research of stress-strain state of the design. Before developing drawings of the composite steel and concrete grid-cable roof had been reviewed all kinds of roofs shapes, then was adopted the structural concept, which best showing the nature and the features of the developed constructions. This is part of the composite steel and concrete grid-cable roof, which has a segmental form. Boom arched of the construction is equal to 0,56 m. Curve of the roof was achieved by the difference of length top and bottom belts. As stated earlier top belt of roof is made as a concrete slab that is reinforced with grids from rebars class A-3. The rods of the steel lattice are made from steel tubes, which have an outer diameter of 57 mm and an internal diameter of 50 mm. All steel components of the composite steel and concrete grid-cable roof, such as tubular steel rods of lattice and steel plates of nodes are connected by welding. The full-length experimental sample of the composite steel and concrete grid-cable roof consists from two edge modules and five span modules. The difference between the edge and span modules is in the connection nodes. Connecting the edge and span modules to each other is performed using high strength bolts with a diameter of 24 mm. The edge module's weight without weight of concrete is 44,6 kg, the span module's weight without weight of concrete is 38,58 kg, the mass part of the bottom belt is 4,1 kg, so the total weight of constructions without weight of concrete is 335 kg, and with concrete and reinforcement 1,8 tons. This mass is less than the mass of counterparts with the same span. Have made the experimental program for the further researches of the roof. The program includes tests of the roof construction on nodal loads. Experimental module is going to be loaded with special metal weights. Deformations are going to be recorded using photogrammetric method.
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