三角形核心筒在超高层建筑结构中的应用研究

Application research of triangular core tube in high-rise structure steel frame and concrete core tube

三角形核心筒能提供的抗侧刚度和楼层平面利用率都不如矩形核心筒,因此在超高层建筑中应用较少。结合实际工程,介绍了三角形核心筒在超高层建筑结构中的应用,采取了相应加强措施,并进行了风洞试验。通过方案比选和计算分析可知,为有效抵抗水平荷载,结构布置时利用避难层设置加强层,以增强整体结构的抗侧刚度。风洞试验结果表明,体型系数在裙房以下个别风向角大于1.4,大部分结果都小于1.4,不同风向角风荷载作用下的层间位移角均小于规范风荷载结果。前两阶周期接近7s,塔楼抗侧刚度相对较弱,但前两阶振型均为平动,扭转周期比为0.5,整体抗扭刚度较好。在进行构件截面设计时,应考虑不同方向水平力的作用,且地震作用方向应与墙肢长度方向一致,风荷载方向应与墙肢垂直。

Triangular core tube can provide less lateral stiffness and floor plan utilization than rectangular core tube,so it is seldom used in the super high-rise buildings.Combined with practical engineering,this paper introduces the application of triangular core tube in super high-rise building structure,and takes corresponding strengthening measures,and carries out wind tunnel test.In order to resist the horizontal load effectively,the reinforced stories are used to enhance the lateral stiffness of the whole structure.The results of wind tunnel test show that the shape coefficient is greater than 1.4 in the wind direction below the skirt,and most of the results are less than 1.4.The first two order periods are close to 7s,the tower lateral stiffness is relatively weak,but the first two order modes are translation vibration,the torsional period ratio is 0.5,this structure has high overall torsional stiffness.The horizontal forces in different directions should be considered in the design of the cross-section of the members,and the direction of seismic action should be the same as the length of the wall limb,and the direction of wind load should be perpendicular to the wall limb.