无锡苏宁广场北楼基于性能的抗震设计研究

Performance-based seismic design of North tower of Wuxi Sunning Plaza

研究基于性能的抗震设计方法在超限高层建筑中的应用,以无锡苏宁广场北楼为例,采用性能化设计方法使结构抗震设计从宏观定性的目标转化为具体的多重目标,从而提高设计的可靠性。首先建立超限高层建筑结构在不同水准地震作用下的抗震性能水准和性能目标,利用弹塑性分析及评估软件PERFORM-3D建立结构的基准有限元模型,计算结构在小震和中震作用下的弹性响应,并进行结构静力弹塑性分析和大震作用下的弹塑性时程响应分析,然后利用各水准地震作用下的响应判定结构的性能水准,从而确定结构是否达到预期的性能目标。计算结果表明:无锡苏宁广场北楼能够满足我国现行抗震规范提出的各项抗震设防要求和各项既定的抗震性能目标,对其采用基于性能的设计是对超限高层设计方法的有益探索。

The application of the performance-based seismic design of tall buildings beyond the code-specification was investigated by applying the method into the design of the North tower of the Sunning Plaza in Wuxi,Jiangsu province.In addition,the method can change the seismic design from one macroscopical goal into specific multi objectives.Performance levels and performance goals of tall buildings beyond the code-specification under different earthquake intensities were established.The standard model of North tower was created and analyzed using PERFORM-3D.The analysis result was the used to determine if the performance goal was achieved.The result shows that the response of North tower can meet the requirement of the code for seismic design buildings of China and the performance goal.The application of the performance-based design method is a beneficial reference for the seismic design of tall buildings beyond the code-specification.