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Nonlinear Seismic Analysis of Space Structures with Partially Restrained Cnnections.
Author(s) -
Gao Liwei,
Haldar Achintya
Publication year - 1995
Publication title -
computer‐aided civil and infrastructure engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.773
H-Index - 82
eISSN - 1467-8667
pISSN - 1093-9687
DOI - 10.1111/j.1467-8667.1995.tb00383.x
Subject(s) - hinge , nonlinear system , structural engineering , finite element method , serviceability (structure) , tangent , stiffness , seismic loading , engineering , mathematics , geometry , physics , quantum mechanics
An efficient and robust finite‐element‐based method for estimating nonlinear responses of complex three‐dimensional structures with partially restrained connections under dynamic and seismic loading is presented. The method is developed using the assumed stress‐based finite‐element method in which the tangent stiffness can be expressed in explicit form and fewer elements are needed to model a structure. Geometric and material nonlinearities and the nonlinear behavior of partially restrained connections are considered. For the dynamic and seismic analyses, three major sources of damping are considered. They are viscous damping, hysteretic damping in the PR connections, and the hysteretic damping at the plastic hinges, if plastic hinges are developed in the structure. It is observed from the examples considered in this study that proper consideration of PR connections is essential in modeling the realistic dynamic and seismic behavior of structures. Numerical results show that the presence of partially restrained connections may not cause failure of a structure due to insufficient strength but may make serviceability constraints, e.g., the lateral deformation, more critical.