核电站常规岛主厂房结构抗震性能设计

Performance Based Seismic Design of the Main Power Building in Conventional Island of Nuclear Power Plant

核电站常规岛主厂房结构布置受限于工艺流程,含较多的错层、跃层,使结构的刚度与质量分布严重不均匀,往往超过了规范的适用条件,地震期间若出现功能中断或设备受损都将造成巨大的损失。基于性能的抗震设计应用于主厂房结构的抗震设计与评估中,在承载力和变形能力两个方面量化其抗震水平,确保主厂房的抗震能力满足预期设防目标。承载力依据现行抗震规范设计,变形能力的评估细化到构件的层次进行,在此基础上选取了5条地震波记录对典型常规岛主厂房结构进行弹塑性分析。结果表明:核电站常规岛主厂房结构能够在地震作用下保持不倒塌,结构具有较大冗余度,能保证核岛安全。

The main building of nuclear power station is a special kind of industrial structure, with irregular in mass and stiffness. The analysis and design should be carried on very carefully. If functional disruption or damage to the equipment during an earthquake, huge damage will be generated, the perform-based seismic design method is used to the main plant structure, the seismic bearing ca- pacity and deformability capacity are both scrutinized, to ensure the seismic capacity of the main plant to achieve predetermined seis- mic aims, Design can be based on the current code for seismic design of buildings, and the evaluation of deformability capacity can be based on the element level. On this basis, five seismic waves recorded are used on the main plant structure. Results show that through reasonable design the main power building can have larger redundancy to avoid collapse under earthquake and sudden loss of bearing capacity of its key component, and can ensure the safety of the nuclear island.