Investigation of the Deformation State of a Composite Cable Space Frame Structures with a Photogrammetric Method

Abstract

The article presents experimental study results of the deformation state of composite cable space frame structures, including composite steel-concrete structures. Composite cable space frame structures are three-dimensional roof framing of long-span buildings. The designed constructions are a new type of roof framing structures and consist of typical composite steel-concrete modules connected with steel cable elements. The operation of composite cable space frame structures under load is characterised by geometric nonlinearity. The aim of the research is to study the deformation state and changing the geometric shape of experimental structures under the influence of external load. The technique of studying the deformation state of the composite cable space frame structures is based on the principles of digital photogrammetry. At the limit state the composite cable space frame structures change their regular shape. In this case, the central vertical points get the greatest vertical displacements, and the displacement value decreases closer to the supports. It is defined that the investigated construction has demonstrated combined action of all its components during the test, which indicates its effectiveness. The application of the photogrammetry method made possible to determine the moment of reaching the limit state of the composite cable space frame structures concretely.

Stress-Strain State Analyses of the Composite Steel and Concrete Grid Structure

“…To simplify the equation of the system, the influence of various factors on the above-mentioned forces that occur in the reinforced concrete part (top chord) of the composite steel and concrete grid structure was experimentally obtained. Experimental (Storozhenko et al 2018), as well as theoretical studies, showed that of the total evenly distributed load of intensity 𝑞 applied to the top chord of the composite steel and concrete grid structure, only 4-9% affects the values of the component equations 𝑀 𝑥 , 𝑀 𝑦 , 𝐻, 𝑉 𝑥 and 𝑉 𝑦 , which corresponds to the stress-strain state during bending. The rest 91-96% of the load 𝑞 falls on the components 𝑁 𝑥 , 𝑁 𝑦 , 𝑆 𝑥 and 𝑆 𝑦 , and this corresponds to the «momentless» stress-strain state.…”

Estimate of technical and economic benefits of a new space composite structure

“…2), which ensure efforts distribution in structure elements so that the top chord will be only in compression and the bottom chord in tension. In [12] described the results of research, the task of which was to determine the geometrical parameters of curvature of the new space composite structure with pinnedpinned support (Fig. 2, a).…”

“…The researchers focus mainly on the study of the stress-strain state of beams, columns, slabs, bridge structures, structures for metallurgical and mining industry, etc. [1][2][3].…”

Deformability of Short Steel Reinforced Concrete Structures on Light Concrete

“…Justification and the selection of light concrete [2] for this construction type was based on the selection of physical and mechanical characteristics to ensure normal work throughout the period of operation. Characteristics of concrete samples were determined in two ways: a test of 100×100mm cubes and cylinders of 400mm height and 100mm in diameter (Fig.…”