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Analyses of Dynamic Performances and Low-Cycle Fatigue Behavior of Concentrically Two-Story X-Braced Frames

Author: LiangShouKe
Tutor: ZhangWenYuan
School: Harbin Institute of Technology
Course: Structural Engineering
Keywords: Center support frame X-shaped cross-layer support slenderness ratio Time history analysis Fatigue damage
CLC: TU391
Type: Master's thesis
Year: 2007
Downloads: 108
Quote: 4
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Abstract


Framework - center support system is commonly used in one of the the dual lateral force resisting system , as an economic , effective seismic structure has been widely used in the high-rise building structure . But poorly designed frame - Center support structure in the rare earthquake vulnerable to serious damage . Chevron and V-shaped center support structure under strong earthquakes make cross- support frame beams intersect unbalanced force will increase the amount of steel structure . The use of cross-layer X-shaped center support to avoid such drawbacks , therefore , based on the seismic design considerations , this paper analysis study focused on the performance of cross-layer X-shaped center support structure model . Slenderness ratio of steel support framework - Cross- layer X -shaped center support structure system and Bearing Capacity affect the key factors of the seismic performance of the system . Domestic norms are very strict provisions on the steel support slenderness ratio limits , and to strengthen support in the support of the Bearing Capacity , and may even lead to a larger role in the earthquake , and experimental studies have shown that : support slenderness ratio the smaller fatigue life is low. Support slenderness ratio changes to do a more detailed analysis and comparison of the performance of the power structure in a major earthquake , do a brief comparison of the dynamic performance of the structure and support to strengthen and not strengthen cross-section . Support for major earthquake fatigue performance , dynamic elastoplastic analysis and comparison of the structure by changing its slenderness ratio found: model supporting bar Fatigue damage value decreases rapidly with slenderness ratio increases ; support rod Fatigue damage vertical distribution largely with the support where the floor height increases and decreases , and the individual floors and there will be a sudden increase in the phenomenon . Finally , through the static and dynamic elastic-plastic analysis to support both ends of the 24-storey model stiffness , just pick and hinged top acceleration , displacement , and shear indicators . The results show that support both ends just pick or articulated no effect on the stiffness of the structure in the elastic stage and plastic stage structural rigidity to support both ends of the rigid connection ; structure the dynamic performance indicators in the plastic stage .

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