Damping characteristics of friction damped braced frame and its effectiveness in the mega-sub controlled structure system

Based on energy dissipation and structural control principle, a new structural configuration, called the mega- sub controlled structure (MSCS) with friction damped braces (FDBs), is first presented. Meanwhile, to calculate the damping coefficient in the slipping state a new analytical method is proposed. The damping characteristics of one-storey friction damped braced frame (FDBF) are investigated, and the influence of the structural parameters on the energy dissipation and the practical engineering design are discussed. The nonlinear dynamic equations and the analytical model of the MSCS with FDBs are established. Three building structures with different structural configurations, which were designed with reference to the conventional mega-sub structures such as used in Tokyo City Hall, are comparatively investigated. The results illustrate that the structure presented in the paper has excellent dynamic properties and satisfactory control effectiveness.     

强震作用下超高层建筑结构MSCSS的响应特性研究

笔者根据超高层巨型建筑结构体系的构造特点,论述了将结构振动控制原理融入巨型结构本身构造之中的构造新结构体系的方法,并采用这一方法提出了巨子型有控结构体系MSCSS(Mega-sub controlled structural system),分析了MSCSS的构造原则及控制理论背景,研究了MSCSS在罕遇地震及超罕遇地震(加速度峰值达到1000g)时的结构响应控制特性、塑性铰发生规律及结构灾变情况。通过与巨型框架结构的灾变情况相比,表明了MSCSS抵御地震作用的高可靠性及良好的经济性,也表明了将结构振动控制原理融入结构自身的构造之中、通过结构自身的功能单元实现结构响应控制的方法是合适的,是研究超高层建筑结构新体系的有效途径之一。     

地震力作用下影响巨子型有控结构的动力参数研究

附加柱刚度与附加阻尼为影响巨子型有控结构抗震性能的两个重要参数。本文基于随机振动理论探讨水平地震作用下附加柱刚度及附加阻尼对巨、子结构动态特性的影响,分析附加阻尼与附加柱间的制约关系,并对比研究传统巨型框架结构、巨子型有控结构安装流体阻尼器前后的响应功率谱变化。结果表明:巨子型有控结构具有极好的抗震性能,安装合理的附加阻尼后,其抗震能力得到进一步提高;附加柱刚度变化不但影响巨、子结构动力响应,而且会导致最优附加阻尼区间迁移。因此,巨子型有控结构具有广阔的发展空间,实际设计中应充分考虑附加柱与附加阻尼的相互影响。