Abstract
Structural stability relates directly to the robustness of the system even against the abnormally large load or an unexpected event which might cause perturbation- changes from the normal state of the structural system- from significant damage. This study aims to examine the sensitivity of frame systems (primarily steel moment resisting frame systems) to the initial damage and second-order geometric effects, that may arise as a result of the design load and abnormally large load coming from the unexpected event. Incremental analysis is used to track the development of second-order effects. Planar Frame models are first examined to establish the patterns of the stiffness losses occurred with various cases of hazard-independent damages. The comparison of the anticipated behavior on Reinforced Concrete (RC) frame systems is investigated through buckling analysis of steel and RC frame systems. Observing the patterns, the study is extended to a 3D model, four-story moment frame structure, located in a coastal area and exposed to a design hurricane event, thereby addressing multi-hazard issues. The impact from the amount and location of the hazard-independent damage as well as the complexity of the frame system is studied for steel frame system which generates the overall idea of individual member perturbations and stability failure of the system, as a whole.
Highlights
Stability of any structural system is defined by its ability to not be affected by the perturbations occurring in the system [1]
Limits for the axial load applied to beam-column elements that cause the bifurcation of equilibrium and excite second–order geometric effects are calculated
The generalized elastic buckling load analysis of the portal frame validated the accurate use of hazardindependent damage approach, and can be further used for developing the tools based on measurement science needs for the structural design
Summary
Stability of any structural system is defined by its ability to not be affected by the perturbations occurring in the system [1]. The researchers modeled a 4 - story steel framed building system and investigated the robustness of the structure by proposing several hypothetical 1st- floor column removal cases. They employed a typical load (includes dead, live and notional loads). A few structural members exceeded their design capacities under the column removal scenarios, and replacing with stiffer members could not destroy the stability of the system This motivates for the consideration of higher magnitude lateral loads. This study depicts the loss of stability after a damaging event and illustrates how the perturbed system responds to the loading and is the prime motivation for the work presented in this paper. Sezen and Akah [6] performed collapse
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