Analysis and characteristics of shear failure of steel sheet beams and dynamic inelasticproperties of composite beams and columns with steel composite sections filled withconcrete in tall structures

In this article, the dynamic stability of a multi-layer composite beam under the effect offollower force has been investigated. For this purpose, the stability equation of amultilayer composite beam was obtained by using the basic bending equation governingthe beams and calculating the bending moment imposed on a multi-layer composite beamin terms of the elements of the triple matrices A, B, D. Composite column (steel, concrete)is a compression member that is usually used as a load-bearing member in compositeframe structures. This type of column is more rigid than conventional steel and reinforcedconcrete columns due to its high compressive strength. It is often used in the constructionof high-rise structures and important buildings. The main purpose of designing andimplementing structures It is possible to achieve the advantages of the common structuralperformance of both simultaneously, so we analyze and analyze the composite structureswith columns buried in concrete, which have the property of being resistant to buckling, inthe form of seismic design to investigate the seismic behavior. These models are based onthe accelerations of the base maps and the analysis of the models has been done with thenon-linear dynamic analysis method by Seismostruct software, which has the ability toperform various types of analysis, including static and dynamic in linear mode. and nonlinear,and also the non-linear behavior of composite columns, including I-shaped steel sections filled with concrete, is modeled in three dimensions by the finite element method with the help of software (ABAQUS) and investigated with the use of steel without concrete. The comparison is made The software (ABAQUS) has been modeled and compared with the case of using steel without concrete, the frames designed with type ۱ and ۳ composite columns have similar structural behavior in bending performance, so that ductility, softness and proper performance To repel the lateral force is one of the characteristics of these two sections, and also a number of beam plates were modeled and analyzed in full scale to determine the characteristics of the shear failure mechanism. The purpose of this large-scale nonlinear numerical analysis study is to determine how, when, and why elasticity occurs in a section of a spring member. At Tests have shown that the shear created by the plastic joint occurred only at the end of the sheet. This preference is caused by the shear deformation near the support, not due to the bending stress caused by the tensile fields. Also, a comparison of the ultimate capacity of different beams and different regulations and different theories is presented. Finally, it has been shown that simple shear plates, in the form of isolated plates, do not accurately represent the failure mechanism of beam plates.

Keywords:

Composite columns , seismostruct , steel composite column , multilayer composite beam , flutter , dynamic stability Steel plate beams , shear failure mechanism , plastic joints , ultimate capacity