Abstract
The dynamic response of semi-rigid frames is studied by using a computer program. The connection flexibility is modeled by linear elastic rotational springs. Having the same geometry and cross-section; semi-rigid frames, with different spring coefficients, are examined. The reducing coefficients and lateral rigidity values, representing the real behavior of frames, are determined for each frame. To represent the real behavior, all deformations of a frame are accounted for a dynamic analysis. Response characteristics of five different multistory frames are compared with reference to their modal attributes. The study indicates that connection flexibility tends to increase vibration periods, especially in lower modes, while it causes vibration frequencies decrease.
Highlights
Defining behaviors of frames under dynamic loads exactly takes a important place in earthquake engineering
The primary objective of the present study is to investigate the dynamic characteristics of semi-rigid frames and how connection flexibility influences them
A semi-rigid frame was modeled by rotational springs
Summary
Defining behaviors of frames under dynamic loads exactly takes a important place in earthquake engineering. The behavior of connections is not rigid Structures having such flexible connections in which connection flexibility becomes important are called semi-rigid frames. In reality all frames are semi-rigid , because there is not a frame which has truly pinned and perfectly rigid connections. The classification system by Bjorhovde et al [2] is based on the response of a frame element, while the other classification system by Eurocode 3 [3] is based on the response of a frame. These classification systems were developed by using the results of many studies performed in last decades
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