I. Introduction
Hybrid constructions consist of dissimilar structural elements, such as stiff rods and struts, as well as flexible membrane and cables which are assembled for optimal fitting their primary functions [1]. The rods and the struts bear non-uniform and point loads, thus mitigating structural deformations. High-strength cables are effective for buildings with large column spacing. Polymer membrane forms lightweight and architecturally impressive shell. Hybrid constructions have found use in roofs and facades of permanent buildings, such as railway stations, airports, exhibition halls and stadiums [2], as well as in temporary canopies for recreation areas, points of retail and construction sites.