The bearing capacity reserves of steel columns of a single-span frame with a proportional increase in loading history

Abstract

Abstract Searching for the reserves of non-standard construction and the improvement of the structure of steel and metal columns is an urgent task. This makes it possible to more fully take into account the actual operation of structures and the saving of metal. Experimental studies of work stylus-bending columns in warehouses were carried out mainly on models. In this work, the goal is to experimentally investigate the operation of full-scale columns as part of the cross section of a one-story and one-span industrial building, corresponding to real construction conditions. Actual field tests will allow to obtain a reliable picture of: the stress-deformed state of compression-bending columns, to determine the horizontal displacements of the cross-section, to obtain a picture of the operation of nodes, to investigate the issue of general and local stability, to reveal real reserves of the column’s bearing capacity. Experimentally obtained test data of natural I-beam compression-bending columns as part of a frame with the application of all loads acting on them (permanent, wind and crane) at different stages of loading (up to the exhaustion of the bearing capacity) made it possible to determine the actual stress-strain state of the columns and their movement, development of plastic deformations in shelves and walls, local loss of stability of compressed shelves and walls, general loss of stability of columns in the frame, deformation of column base plates. According to the results of the experiment, it was established that the columns in the frame lost the load-bearing capacity of the experiment at loads greater than 1.6 of the calculated level.