PORTAL METHOD OF APPROXIMATE ANALYSIS The portal method is an approximate analysis used for analysing building frames subjected to lateral loading such as the one shown in figure 1(a). This method is more appropriate for low rise (say height is less than width) building frames. In the analysis, the following assumptions are made: 1. An(…)
Analysis of Frames
Frames: Portal frames are frequently used over the entrance of a bridge and as a main stiffness element in building design in order to transfer horizontal forces applied at the top of the frame to the foundation. On bridges, these frames resist the forces caused by wind, earthquake, and unbalanced traffic loading on the bridge deck. Portals can be pin supported, fixed supported, or supported by partial fixity. The approximate analysis of each case will now be discussed for a simple three-member portal.
Elastic analysis deals with the study of strength and behavior of the members and structure at working loads. Frames can be analyzed by various methods. However, the method of analysis adopted depends upon the types of frame, its configuration (portal bay or multibay) multistoried frame and Degree of indeterminacy.