设防烈度7度地区混凝土悬挑结构竖向地震作用计算分析及思考  

Analysis and Reflection on Vertical Seismic Action Calculation of Concrete Cantilevered Structures in Areas with Seismic Intensity of 7 Degrees

作　　者：汪方羲 WANG Fangxi

机构地区：[1]福建天正建筑工程施工图审查事务有限公司,福建福州350001

出　　处：《福建建设科技》2023年第6期21-24,共4页Fujian Construction Science & Technology

摘　　要：现行主要建筑结构设计规范之间对混凝土悬挑结构竖向地震作用何时考虑、如何考虑的相关规定存在一定差异。通过规范条文及相关文献梳理,文章以实际工程案例为研究背景,对比分析不同悬挑长度下,悬挑构件竖向地震作用内力变化幅度。文章结合工程案例对比计算提出设防烈度7度0.15g地区,混凝土结构悬挑长度达4m及以上时应考虑竖向地震作用的观点,指出长悬挑结构采用竖向地震反应谱方法并补充时程分析法计算,且相应构件按抗震性能化加强设计,可保证悬挑结构具有良好的抗震性能,对混凝土悬挑结构的抗震设计具有借鉴意义。There are certain differences in the relevant regulations on when and how to consider the vertical seismic action of concrete cantilever structures in the current main building structure design specifications.This article compares and analyzes the amplitude of vertical seismic internal force changes of cantilever components under different cantilever lengths through the review of normative provisions and relevant literature,taking actual engineering cases as the research background.The viewpoint is proposed that in areas with a fortification intensity of 7 degrees and 0.15g,when the cantilever length of concrete structures reaches 4 meters or more,vertical seismic action should be considered.Based on engineering cases,it is pointed out that the long cantilever structure adopts the vertical seismic response spectrum method and supplements the time history analysis method for calculation,and the corresponding components are designed according to seismic performance strengthening,which can ensure that the cantilever structure has good seismic performance and has reference significance for the seismic design of concrete cantilever structures.

关 键 词：悬挑结构 竖向地震作用 悬挑长度 性能化设计 

分 类 号：TU973.31[建筑科学—结构工程]