МЕТОДИКА РАСЧЕТА КОМБИНИРОВАННОЙ КОНСТРУКЦИИ ПОКРЫТИЯ ШПРЕНГЕЛЬНОГО ТИПА

Abstract

Hybrid building structures have advantages in terms of efficiency of using high-strength materials and reducing deformations under load. To expand the scope of their practical application, it is necessary to improve techniques for structural analysis and design methods. The object of the present research is a hybrid structure of the strutted-type. The top chord of the structure is formed by rectilinear beams arranged in radial direction and pivotally connected in the ridge joint. The bottom chord consists of high-strength cable elements and hinge struts. For the static analysis of the structure, its flat model is adopted. The static indeterminacy is solved by means of the method of redundant reactions. The applicability of the method is justified by restriction of structural deformations implied by the serviceability limit state. Analytical expressions are proposed to determine the forces and bending moments in the main structural elements. The resulting expressions are unified to perform the structural analysis under pre-stress and external loads by means of supplementary parameters introduced. An improved technique for finding the matrix of coefficients and the vector of free terms of the canonical system of the method of redundant reactions is proposed. The technique allows automating the calculation. A method for taking into account flexible cable elements is developed. The method includes step-by-step eliminating of compressed cables from the design scheme. The results of the work contribute to the development of hybrid strutted-type structures and can be used for developing optimal design solutions, as well as to identify patterns of stress-strain state of the hybrid structures by means of the numerical simulation.