考虑结构损伤的消能减震结构能量设计方法

ENERGY-BASED ASEISMIC DESIGN FOR BUILDINGS WITH PASSIVE ENERGY DISSIPATION SYSTEMS CONSIDERING DAMAGE

与基于承载力和基于位移方法相比,基于能量的抗震设计方法能够更为全面的评估结构抗震性能。该文从能量的角度提出了一种考虑主结构损伤耗能的简化抗震设计方法,将结构滞回耗能设计由阻尼器和主结构共同承担,并据此用等效阻尼比将损伤引入到主结构,通过延性系数建立了结构损伤指数与等效阻尼比之间的关系,给出了阻尼器耗能求解公式及设计流程。该方法无迭代过程,且能在设计之初实现主结构的损伤控制。算例表明,该方法简单、实用,为消能减震结构设计提供了一个新方法。

Energy-based design method is a more comprehensive evaluation tool compared with strength and displacement-based methods for structural aseismic performance. In this paper a simplified energy-based design method is proposed, considering main structure damage for aseismic structures with passive energy dissipation systems. The hysteretic energy of structures is being dissipated by dampers and structural members together during severe earthquakes. Thusly, this method utilizes an equivalent damping ratio to determine the damage of the main structure and establishes the relationship between the equivalent damping ratio and main structural damage index through the ductility coefficient of the structure. At the same time, the formula is developed to solve dissipative energy of dampers and a step-by-step process is proposed. This is in stark contrast to the previous energy-based method that the proposed method has no iterative process and realizes damage control of the main structure at the beginning of design. At last, the simplicity and practicability of the proposed design method for buildings with passive energy dissipation systems is verified through a numerical case of 12-story frame.