| Title |
The P-Δ Effect of Semi-rigid Steel Frame considering the Location of Shear Walls |
| Keywords |
semi-rigid connections ; shear wall ; steel frame ; P-Δ effect ; shear wall location |
| Abstract |
The steel framework is one of the most commonly used structural system in modern construction. Conventional analysis and design of steel frames are performed using the assumption that the connections are either fully rigid or ideally pinned. Although the use of such idealized connection behavior greatly simplifies the analysis and design process, the predicted response of the idealized structure may be quite different compared with the response of the actual structure. In fact, the actual moment-rotational behavior of beam-to-column connections in practical process always falls in between these two extreme cases. In the past two decades, various models for many types of semi-rigid connections are idealized by many researchers. In those days, practical frame analysis programs and design guidelines for PR (Partially Restrained) constructions have been developed. It is very useful under satisfying serviceability and stability conditions to combine rigid and semi-rigid connections in tall buildings. In this study, the effect of shear wall depend on the locations is studied for steel structures with reinforced concrete core. The range of rotational stiffness of semi-rigid connections is followed by the Eurocode 3 classification. A linear moment-rotation model of the semi-rigid connections is used by beam-line rotational stiffness.
The results of this study are as follow. The effect of shear wall is the most important factor to reduce lateral drift of the structure. The effect of shear wall is better when shear wall is located in the center bay than in the corner bay because symmetrical structures produce less drift than asymmetrical structures. When the ultimate moment of the connection is 50% of the beam plastic moment and the shear wall is located in the center semi-rigid connections are economic and effective. The thickness is a factor of reducing the lateral drift of the structure. However, the thickness of the shear wall is less effective than the locations of the shear wall. To verify these results can be applied to the high-rise buildings, the 5bay-15story model is analyzed too. |