Journal of Civil Engineering Researchers
Volume:3 Issue: 2, Spring 2021

In this article, I have tried to collect a set of functions of different types of composite columns. For the first time, a set of articles and the performance of different types ofcomposite columns are studied, reviewed and compared. Some of the influential factors are: study of the behavior of various buckling modes, their performance under compressive loading with and without eccentricity, study of local and general buckling of composite columns, factors causing confinement in composite columns, behavior of these columns in different strength ranges from concrete alone Normal strength to high strength concretes, also the performance of these columns under the influence of steels with different yield stresses, the effect of behavioral performance of changing the thickness of steel hollow pipes, the presence or absence of steel profiles in the coreof composite columns and finally to verify the results The laboratory is compared withnumerical methods by software to confirm the accuracy of laboratory work as much as possible© 2017Journals-Researchers. All rights reserved

Lateral load-bearing systems are part of a structure that has the task of withstanding lateral loads and directing them from a safe path to the foundation. Ancillary forces can include earthquake load, wind load, or other forces. Nowadays, with the increasing use of concrete structures in construction projects, also the basic need to strengthen concrete structures for various reasons such as changing the use of the building, the age of the building and other things, knowing and using new and appropriate methods for Increasing the bearing capacity of concrete building frames against lateral forces is essential and unavoidable. In this article, by reviewing new articles and researches in the field of new types of lateral load reinforcement systems in reinforced concrete frames, the efficiency and productivity of each method have been evaluated and measured.