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CONTENT:-

(1) Modeling of the frame as a 2D frame with hinged support in SAP2000 

(2) Modeling of the frame as a 2D frame with fixed support in SAP2000

(3) Modeling of the frame as a 3D frame with foundations in the model in SAP2000

(4) Modeling of the frame as a 3D frame with foundations in the model in Plaxis 3D  

INTRODUCTION:-

As known, the foundations are the structural elements that are responsible to transfer the loads acting on the superstructure to the soil. However, the relationship between the footing and the column still making a debate between the structural engineers for the best method to model it using the finite element software. In this file, we will develop a case study on a simply RC frame with different methods to reach the most closed method to the actual performance. The structure is an RC frame with a span of 8 m, consists of a girder with dimensions of (300x700) mm, supported on two columns with dimensions of (300x500) mm, and their height is 5m included 1m embedded in the soil. The acting loads which will be taken into consideration during the analysis are SDL of 50 KN/m only -the own weight of the structural elements will be ignored, SAP models will be developed to the frame as a 2D frame with hinged supports, and then fixed supports, and the foundations will be designed manually. After that, the frame will be analyzed with the isolated footings in the same SAP model as a 3D model. Finally, a Plaxis 3D model will be created with the frame, footings, and the soil in the same model to study the soil-structure interaction. Finally, we will compare the bending moment acting on the columns in each case, and the maximum bending moment acting on the footings too, and after that, we will conclude which method is the closest one to the soil-structure interaction results developed by Plaxis 3D.