Moment resisting frames are most frequently used in seismic design systems for steel buildings. Following the Northridge and Kobe earthquakes there have been many studies examining the strong axis steel moment connections. In particular, these efforts have been supported by the government in the US. In Korea on the other hand, researches on the seismic behaviours of weak-axis moment connections are difficult to fine even though these connection details have been frequently used as seismic details of local MRF. As a result, the objective of this research is to provide information on the seismic behaviours of welded free flange type(FF) and welded flange plate type(WFP) weak-axis steel moment connections that were quoted by the FEMA. For this purpose, an experimental program was designed and performed with 2 types of weak-axis steel moment connections. From the test results, both FF and WFP type connections revealed to have more than 3% story drift capacity, which satisfy the required performance for OMF systems.
In the last several decades, coupled shear wall have become recognized as efficient lateral load resisting systems for high-rise structures, increasingly. Coupled shear walls give considerable lateral stiffness and strength as well as providing an architecturally practical structural system. In this paper, in order to observe seismic performance of coupled steel plate shear wall, models of previous study was verified, and coupled shear wall with steel plate was carried out with various parametric analysis. Parametric analysis was performed with various width of bay. As a result, model that aspect ratio of steel plate was close to 1 was the most structurally safe.
Coupling beams have been used in high-rise shear wall buildings widely, which take great advantages of high stiffness, small lateral deformation and easy to satisfy with bearing capacity. Coupling beams exhibit different performance with deep beams, which always have small depth-to-span ratio. According to current standards coupling beams shall be reinforced with two intersecting groups of diagonally placed bars symmetrical along the midspan. It's always hard to optimize construction projects. This paper used the finite element software (Abaqus) to analysis and simulate the nonlinear behavior of steel composite reinforcement and compared the results to the current standards.
Mathematical model through system identification techniques is composed of the development of a variety of back Analysis solutions and signal processing technology reflecting physical damage of structures. This study was in progress divided into analysis and experimental research, and it was simulated by simplified model based on relevant theory of damage locations and damage estimates. Steel structure concerned by the vibration and impact load was researched in order to predict the dynamic behavior. The 3rd floor of one bay steel frame structure was used, because analysis of whole structure is inconvenient when analyzing and testing, and it is very hard to accurately predict actual behavior by complexity of model in case of three-dimensional structure. Natural frequency of the simulation was calculated as using ANSYS program, general-purpose finite element analysis program, and damage index was estimated through counting natural frequency when structural damage occurred in the test as using the FDD (Frequency-Domain Decomposition).
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