Document Type
Thesis
Date of Award
1976
Abstract
This thesis presents a procedure for the design of a 12-story rigid frame bent with composite girders when horizontal loads produce the maximum forces for which the girders must be designed. Using an asymmetrical rigid frame with column spacings of 22' and 28', it was found that a decrease in frame weight of slightly greater than 10 per cent could be realized if the frame girders were made composite in areas of positive moment. Drift was found to increase slightly due to the decrease in girder and column size producing less resistance to joint rotation and larger axial deformations.The effects of several design variables were examined. Girder moments were not sensitive to small changes in the length of the partially effective composite section at the windward ends of the girders. Negative steel at the interior column of the two bay wide frame was not a significant factor in reducing girder design moments. However, a change in story height does appreciably affect the frame weight. A change in base condition from that of assumed pinned to assumed fixed ends reduced forces in the first story column and in second and third floor girders. Dividing the lateral load applied at the exterior joints into windward and leeward loads did not change member forces significantly.Although this proposed procedure for designing composite rigid frames appears to be tedious, its application will increase in value with (1) the number of frames involved, (2) an increase in bay widths and the number of bays. An evaluation of the economical advantages of frames designed by the described procedure against non-composite construction would have to be done by comparing savings in frame material weight with the cost of shear connectors and their application as well as the cost of temporary shoring.
Recommended Citation
Schaffhausen, Robert Joseph, "Composite Multi-Story Rigid Frames Under Gravity and Lateral Loads." (1976). All ETDs from UAB. 6984.
https://digitalcommons.library.uab.edu/etd-collection/6984
Comments
MS - Master of Science/Master of Surgery; ProQuest publication number 31751904