杨必峰
    (上海建筑设计研究院，上海200041)

[摘要] 大底盘是多塔楼结构重要的抗震单元和薄弱部位，设计应选择合理的计算模型进行分析，并确保中、大震下大底盘的安全性。介绍了大底盘梁、板在中、大震下的设计目标和设计过程。以工程实例对大底盘梁、板进行定量分析，指出设计中应引起重视的问题。
[关键词] 多塔楼结构；大底盘；平面内应力；抗震设计方法

    Discussion on seismic design for large chassis of multi-tower structure
    Yang Bifeng
    ( Shanghai Institute of Architectural Design & Research,  Shanghai 200041, China)

Abstract: The enlarged base of multi-tower structure was an important aseismic element and was the weakness in earthquake, which should be analyzed with rational structural model and should not be broken by the medium or maximum earthquake action. The aseismic design methods of the beam and the slab in the enlarged base of multi-tower structure were introduced. The problems which should be noticed in the structure design were pointed out by a practical detail analysis.
Keywords: multi-tower structure; enlarged base; in-plane stresses; aseismic design methods