Stress-strain state of hybrid timber-reinforced concrete multy-storey buildings considering creep deformation

The new solutions of hybrid constructions of multi-storey buildings are being developed, in which the main structural material is timber and reinforced concrete or steel is used to ensure spatial rigidity. The problem in developing such projects is a significant difference in the deformation characteristics and rheological properties of timber and concrete, which can significantly affect the load-bearing capacity and serviceability of the hybrid building. At present time the issues of joint work of these materials in the elements of structural systems are insufficiently studied. The purpose of the article is to investigate the stress-strain state of hybrid wood-reinforced concrete multi-storey buildings taking into account the influence of creep deformations. Conclusion. The method of taking into account the peculiarities of deformation and creep of timber and concrete in the calculation of hybrid multi-storey buildings is presented. Using the software complex "Lira" the modeling of the stress-strain state of multi-storey buildings of hybrid construction with columns and beams made of glued laminated timber and the reinforced concrete rigidity core. It is established that the characteristics of deformation and creep of materials significantly affect the value of displacement of the frame elements. The values of vertical displacements, taking into account the creep, are 1,57…1,66 times higher than those determined in the elastic stage. Non-uniform deformation of vertical structures causes skew of the storey cells, redistribution of forces between the elements of the frame and the appearance of additional longitudinal forces in the floor beams. Thus, for design multi-storey hybrid wood-reinforced concrete buildings, it is necessary to take into account the influence of deformation and rheological characteristics of wood and concrete on the parameters of the stress-strain state.