Experimental research of deformability of units of steel and concrete composite grid-cable roof

Abstract. Purpose. Steel and concrete composite grid-cable roof has advantages of metal and concrete space structures [10] . Feature of construction is the principle of rational use of materials and properties of the structural elements. The roof consists of spatial flatness-core units that are connected to each other with specially designed joints. The shape of the roof is made using cables. Investigation of the stress-strain state of the individual elements is an urgent problem. Methodology. Experimentally determine the deformation characteristics and the nature of the loss of loadcarrying capacity of units of the space steel and concrete composite grid-cable roof. Load is applied through the traverse system and a hydraulic jack. For measuring of deformation are used strain gauges. Placing sensors is carried out in the most typical areas of construction. Two types of units of steel and concrete composite grid-cable roof will be researched. According to the results of the experiment to conclude, the method adopted to ensure of joint work of steel and concrete elements is effective. Accepted methods of measuring strain allows to obtain experimental data on which to adequately assess the stress-strain state of the structures under study . Findings. It was found that the destruction of the prototypes was the nature of the plastic. Accepted methods of reinforcement provides sufficient bearing capacity of the elements. Effectiveness of way to ensure joint work of steel and concrete was confirmed. The dependence of the deformation of samples from the load was obtained. In accordance with the obtained dependence it found that the elastic stage of operation of prototypes was observed until reaching a load equal to 70% of the devastating. Originality. Defined mode of deformation of individual bearing elements of the new design ? steel and concrete composite gridcable roof. Practical value. The study of stress-strain state of the individual bearing elements investigated coatings allowed to confirm the effectiveness of constructive solutions, and to provide a method of reinforcing teamwork steel and concrete, which in turn gives rise to a further decision of the common problems and overcome obstacles to the introduction of new structures in the construction practice.