基于刚度和强度指标的大跨度体育馆韧性设计

RESILIENCE DESIGN OF LARGE-SPAN SPORTS STADIUMS BASED ON STIFFNESS AND STRENGTH INDICATORS

  • 摘要: 体育馆具有震后避难救灾的重要功能,抗震韧性需求高,将韧性设计融入体育馆建筑的结构设计之中是急需解决问题。该研究提出韧性正向设计流程,根据结构指标与韧性指标变化规律作为韧性设计引导方向,突破当前韧性设计作为结构设计后“补充验算”的设计模式。通过对大跨度钢结构体育馆进行结构参数化设计,提取所构建113个结构模型的层间位移角指标和基底剪力,分别作为结构刚度和强度指标,计算韧性指标,基于空间分布研究结构指标与韧性指标变化规律。研究发现:刚度和强度指标大小与结构抗震体系有关,采用刚性抗震体系会造成结构刚度指标或强度指标较高,从而韧性指标也最高,选用柔性抗震体系能降低韧性指标,其中隔震支座韧性指标低于屈曲约束支撑的结构;采用屈曲约束支撑减震结构,韧性指标随着屈曲约束支撑刚度增大而减小;采用隔震布置时,支座刚度越小,相对层间位移角增大,基底剪力趋近规范最小限值时韧性指标最小,可实现体育馆韧性水准2的要求,有利于震后使用功能恢复。该文提出的利用韧性指标和结构刚度和强度指标对应关系,可用于韧性初步判断,指导同类型结构选型和布置,实现韧性正向设计。

     

    Abstract: Sports stadiums play a crucial role in post-earthquake evacuation and disaster relief, necessitating high seismic resilience. Integrating resilience design into the structural design of sports stadiums is an urgent issue that must be addressed. A forward design process was proposed for resilience, which takes the changes in structural indicators and resilience as the guiding direction for resilience design, thus breaking through the current design pattern of resilience design as a “supplementary verification” after structural design. Through the structural parametric design of a large-span steel structure gymnasium, the inter story displacement angle index and base shear-force of 113 structural models were extracted and used as structural stiffness and strength indicators respectively. The variation patterns of the structural and resilience indicators were then investigated based on spatial distribution. The findings are as follows: The magnitude of the stiffness and strength indicators is associated with the structural seismic system. A rigid seismic system leads to higher stiffness or strength indicators, which results in the highest resilience indicator, while a flexible seismic system reduces the resilience indicator. Additionally, structures with seismic isolation bearings exhibit lower resilience indicators compared with those with buckling restrained braces; For the structures with buckling restrained braces, the resilience indicator decreases as the stiffness of the braces increases; For seismic isolation arrangements, the smaller the bearing stiffness, the larger the relative inter-story displacement angle, and when the base shear approaches the minimum limit value prescribed by the code, the resilience indicator is minimized. This configuration meets the resilience level 2 requirements for sports stadiums and facilitates the functional recovery after an earthquake. The correlation between toughness and structural stiffness and strength proposed in this paper can be used for preliminary assessment of toughness, guiding the selection and layout of similar structures, and then the forward design of toughness can be achieved.

     

/

返回文章
返回