摘要
目的为了分析防屈曲支撑对选煤厂房结构竖向刚度、动力特性的影响,并通过合理布置防屈曲支撑以减小多遇和罕遇地震下的地震响应.方法运用有限元软件SAP2000建立8度区Ⅱ类场地重介质选煤厂房耗能支撑计算模型,计算了防屈曲支撑在若干布置方案下结构的模态分析及地震响应.结果对于此类平面与竖向均不规则的钢框架结构,合理地布置防屈曲支撑可以增强结构抗侧刚度并有效降低结构平扭藕联程度;能够减小此类钢框架在小震下各楼层最大水平位移,大震下能够降低各楼层最大水平位移、层间位移,并能够显著降低结构顶点的加速度反应.结论通过合理地布置防屈曲支撑可以改善结构竖向刚度不均匀,从而使其动力特性规则化并能减小多遇和罕遇地震下的地震响应.
The purpose of this paper is to analyse the effect of the bucking-restrained brace on the vertical stiffness and dynamic property of the main buildings of coal preparation, and to reduce seismic response in the frequently occurred and seldom occurred earthquake by arranging bucking-restrained brace reasonably. Finite element analysis software SAP2000 is used to establish the calculation model of bucking-restrained brace in the slime separation technology by using heavy media cyclone of steel structure of coal preparation plant at seismic fortification intensity 8, site Ⅱ area, and to calculate the model analysis and seismic response of structure as the bucking-restrained brace in several kinds of plans. The results indicate that reasonable arrangement on the anti-buckling support can enhance the lateral-resistance stiffness of the structure and effectively reduce coupling of translational and torsional vibration of the structure, for such an irregular steel frame structure;it can reduce the maximum horizontal displacement of each floor of the steel frame in a small earthquake;besides, it can also reduce the maximum horizontal displacement of each floor and the dis- placement between floors in a big earthquake as well as significantly reduce the acceleration response of the vertex of the structure. The conclusion is that the bucking-restrained brace can effectively improve the irregularity of vertical stiffness for the structure, which can make its dynamic properties regular and reduce the seismic response under frequently occurred and seldom occurred earthquake.
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2012年第2期228-233,共6页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(60940036)
关键词
防屈曲支撑
选煤厂房
平扭藕联
地震响应
减震控制
bucking-restrained brace
main buildings of coal preparation
torsional uncoupling
earthquake re sponse
damping control
