Abstract
The paper considers the features of formation of finite element models of tube confined concrete structural elements in the form of centrally compressed rod with strengthened cores. The prerequisites, which underlies the proposed approach to the formation of finite element models of tube confined concrete elements with strengthened cores, are given. Lengthwise the tube confined concrete elements have constant dimensions and a set of cross-sectional components. It is proved that the use of high-strength concrete allows performing calculations in the elastic stage of the work of materials. When modeling the work of rod reinforcement in tube confined concrete elements with strengthened cores, it can be represented as an imaginary cylinder with a cross-sectional area equal to the area of the rod reinforcement. The proposed prerequisites for the numerical simulation of the work of tube confined concrete elements with the strengthened cores of the studied types allowed to construct adequate finite element models. The difference in the value of the load-bearing capacity obtained from the results of physical and numerical experimental studies was 5,94…7,72 %.
Highlights
Sustainable development of modern construction requires the use of compressed elements, which would have a large bearing capacity
Due to its numerous advantages, tube confined concrete has become widespread in construction both in our country and abroad [1]
It is known that in compressed tube confined concrete elements the active force is perceived by both the tube shell and the concrete core [3, 4]
Summary
Sustainable development of modern construction requires the use of compressed elements (columns, posts of various purposes), which would have a large bearing capacity These requirements are fully met by tube confined concrete made up of steel pipes filled with concrete. World experience shows that deformation and other mechanical characteristics of tube confined concrete elements depend on geometrical parameters, and on the composition of concrete [6] and the method of strengthening the core [7]. Considering such a number of factors requires the construction of complex mathematical models of the tube confined concrete resistance to the external load [8]. The models of tube confined concrete considered in these works do not cover different ways of strengthening the core
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