Deformation Criteria for Calculation of Composite Constructions

International Scientific and Practical Conference on Innovations in Engineering and Technology

工业技术;自然科学

Shein, A.I.^1 ; Zemtsova, O.G.^1

Penza State University of Architecture and Construction, Titova str. 28, Penza

440028, Russia^1

关键词: Algorithm for solving;    Composite construction;    Composite element;    Composite finite elements;    Deformation criteria;    Deformed state;    Equilibrium conditions;    Limiting deformation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/441/1/012048/pdf
DOI  :  10.1088/1757-899X/441/1/012048

来源: IOP

【 摘 要 】

In this paper we consider the calculation of reinforcement and cross-sections of reinforced concrete structures: beams, columns, diaphragms of rigidity, etc. The article is divided into two parts. In the first part, the criterion for limiting deformations in given zones of the most stressed sections of composite systems is proposed as the basis for calculating reinforced concrete structures. The introduction of the appropriate limitations makes it possible to determine, from the equilibrium conditions of forces in a given section, one of the main geometric parameters of this section: height, width, cross-section of the working armature or the maximum possible load. An algorithm for solving the problem of selecting sections of a statically indeterminate system is shown. This approach is called the method of limited deformations (MLD). The method is illustrated by a number of examples. In the second part, the definition of points of nucleation of cracks and trajectories of their development is established by solving the problem of determining the deformed state of a composite under conditions of a plane stress state. Determination of the main deformations is performed by a modernized finite element method. The finite element calculation is based on specially developed composite elements describing the joint work of concrete and reinforcement. Two new (planar and spatial) composite finite elements are proposed. We show the scheme of formation of the general matrix of rigidity of a composite, as superposition of global matrixes of rigidity of a binder and armature.