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在进行结构体系比较和振动台试验验证的基础上,确定了某大型电厂主厂房选用铰接中心支撑钢框架体系。对深化设计方案进行了地震响应的数值模拟研究。虽结构平面扭转和竖向质量分布均不规则,但考虑到多遇地震下没有构件屈服或失稳,且多遇、罕遇地震下的层间侧移角均满足规范要求,认为结构设计较为合理,可以满足“小震不坏”、“大震不倒”的抗震设防要求。同时也再次验证了只要设计合理,铰接中心支撑钢框架体系在8度抗震设防区仍可具有较好的抗震性能,高度也可以突破民用建筑12层的限制。最后给出了铰接中心支撑钢框架结构节点连接部分抗震设计的一些原则性建议。
Based on the comparison of structural system and vibration table test, it is confirmed that the steel frame system is supported by the center of the main plant of a large power plant. The numerical simulation of the seismic response to the deepening design was carried out. Although the structural plane torsion and vertical mass distribution are irregular, considering that there is no member yielding or destabilizing under the frequently encountered earthquake, the side-to-side drift angle of the rarely encountered earthquake meets the requirements of the specification, and the structural design is relatively Reasonable, to meet “small earthquake is not bad ”, “earthquake does not fall ” seismic requirements. At the same time, it verifies once again that as long as the design is reasonable, the hinged center support steel frame system can still have better seismic performance in the 8 degree earthquake proofing zone, and the height can also break the limit of 12 floors in civil buildings. Finally, some principled suggestions on aseismic design of joints of steel frame structure with hinged center are given.