（中国建筑西北设计研究院有限公司， 西安 710018）

［摘要］西咸新区1A楼，由于建筑的独特造型，存在两处高位长悬挑结构，最大悬挑长度达到12.4m。采用竖向地震波对悬挑结构进行时程分析，对悬挑部位的竖向加速度分布和悬挑部分构件轴力的竖向地震效应等内容进行研究，从而对设计使用的竖向地震作用作定量的分析，给出悬挑部位的竖向地震效应的设计值。对悬挑部分进行中震弹性的性能化设计目标，对悬挑结构非常关键的几榀斜撑进行了防倒塌分析，以保证结构的安全。

［关键词］竖向地震； 悬挑桁架； 时程分析； 性能化设计； 防连续倒塌

中图分类号：TU391文献标识码：A文章编号：1002-848X(2020)14-0025-04

Vertical earthquake analysis and key design points for cantilever structure of 1A building in  Xi-Xian New Area

ZHANG Tao, WANG Hongchen, CHU Ling

(China Northwest Building Design & Research Institute Co., Ltd., Xi′an 710018, China)

Abstract: Due to the unique shape of the building, there are two cantilevered structures with a maximum cantilever length of 12.4m in the high position of the building 1A in Xi-Xian New Area. The vertical seismic wave was used to conduct the time-history analysis of the cantilevered structure, and the vertical acceleration distribution of the cantilevered parts and the vertical seismic effect of the axial force of the cantilevered components were studied, so as to quantify the vertical seismic action used in the design and to provide the design value of the vertical seismic effect of the cantilevered part. The performance-based design objective of the earthquake-resistant elasticity of the cantilevered part, and the anti-progressive collapse analysis of several critical braces of the cantilevered structure were carried out to ensure the safety of the structure.

Keywords:vertical earthquake; cantilever truss; time-history analysis; performance-based design; anti-progressive collapse 

作者简介：张涛，硕士，高级工程师，Email：715022465@qq.com。