您现在的位置:建筑结构>> 期 刊>> 2020年>> 第04期>>正文内容
高地震烈度区大底盘双塔结构设计研究
陈晓航,周定,陈寅,赵青,刘娟
摘 要

(广州容柏生建筑结构设计事务所, 广州  510170)

[摘要]基于某抗震设防烈度8度半区大底盘双塔结构,通过多种计算模型(整体、单塔、多塔切除纯裙房、切除大底盘以上塔楼、不同底盘相对高度)和计算方法(反应谱、弹性时程、弹塑性时程),分析结构周期、振型及振型质量参与系数、层剪力、底盘相对高度、扭转等因素的影响。研究表明:采用规范反应谱法时,各阶振型对不同结构部位的激励是大底盘结构分析的关键。低阶振型对大底盘的激励不足,高阶振型影响较大。因此地震作用下整体模型相对单塔模型的层剪力明显增大;且大底盘不只是影响底部区域,而是放大了塔楼全高的层剪力,楼层越高放大系数越大;在高烈度地震区,大底盘对结构整体指标及构件设计均有显著影响,大底盘楼板水平剪应力的影响有可能超过正应力。

[关键词]高地震烈度区; 大底盘; 双塔; 振型质量参与系数; 底盘相对高度; 扭转效应

中图分类号:TU318文献标识码:A文章编号:1002-848X(2020)04-0084-05

 

Study on design of twin-tower structure with large chassis in high seismic fortification intensity region

Chen Xiaohang, Zhou Ding, Chen Yin, Zhao Qing, Liu Juan

(RBS Architectural Engineering Design Associates, Guangzhou 510170, China)

Abstract:Based on a large chassis twin-tower structure in the region with 8 and half degree of seismic fortification intensity, various calculation models (whole model, single tower model, multi tower model without pure podium, model without tower above large chassis, and models with chassis of different relative heights) and calculation methods (response spectrum method, elastic time-history method, elastic-plastic time-history method) were used to analyze the impacts of structural period, vibration mode and mode mass participation coefficient, story shear force, chassis relative height, torsion and other factors. The results show that the key to the structural analysis of large chassis is the excitation of different modes to different parts of the structure with resporse spectrum method. The lower mode has insufficient excitation to the large chassis, and the higher mode has greater influence. Therefore, the story shear force of the whole model is significantly increased compared with that of the single tower model under the action of earthquake; and the large chassis not only affects the bottom area, but also enlarges the story shear force of the whole tower height, and the higher the floor is, the larger the amplification coefficient is; in the seismic fortification intensity region, the large chassis has a significant impact on the overall index of the structure and the design of the components, and the influence of the horizontal shear stress of the large chassis floor may exceed the normal stress.

Keywords:high seismic fortification intensity region; large chassis; twin-tower; mode mass participation coefficient; relative height of chassis; torsion effect

 

作者简介:陈晓航,高级工程师,一级注册结构工程师,Email:chenxiaohang@gzrbs.com。

下载地址

    你还没注册?或者没有登录?这篇论文要求至少是本站的注册会员才能阅读!

    如果你还没注册,请赶紧点此注册吧!

    如果你已经注册但还没登录,请赶紧点此登录吧!