- 摘 要
-
（東南大學(xué)土木工程學(xué)院， 南京 210096）
［摘要］以某高度為240m的異形截面鋼筋混凝土煙囪為背景，首先建立三維有限元結(jié)構(gòu)模型，并進(jìn)行模態(tài)分析，然后詳細(xì)地對該煙囪采用逐步增量時(shí)程動(dòng)力分析（IDA）方法進(jìn)行計(jì)算，具體包括：選擇合適的地震動(dòng)參數(shù)進(jìn)行逐步調(diào)幅分析，得到水平地震作用下的IDA曲線，根據(jù)性能點(diǎn)明確結(jié)構(gòu)的響應(yīng)變化趨勢以及對應(yīng)的薄弱部位，從而全面地分析結(jié)構(gòu)的抗震性能。研究結(jié)果表明，該煙囪結(jié)構(gòu)滿足7度罕遇地震作用設(shè)防要求，通過對洞口截面的改善、增強(qiáng)洞口配筋以及增加上部結(jié)構(gòu)截面厚度可以進(jìn)一步提高煙囪的抗震性能。本研究對于異形煙囪在高烈度地區(qū)的建設(shè)和設(shè)計(jì)提供了一定的借鑒和參考。
［關(guān)鍵詞］異形煙囪； 逐步增量時(shí)程動(dòng)力分析； 抗震性能
中圖分類號：TU355文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2017)15-0031-05
Seismic performance research of special-shaped chimney structure
Zhu Fengqi, Liu Huanqin
(Department of Civil Engineering， Southeast University， Nanjing 210096， China)
Abstract:A reinforced concrete special-shaped chimney with height of 240m was taken as the background. First, the 3D finite element modeling of the structure was built and the modal analysis was carried out. Then, the gradual incremental time-history dynamics analysis (IDA) method was carried out on the chimney in detail. Suitable ground motion parameters were selected for gradual amplitude modulation analysis to obtain IDA curves under horizontal earthquake action, and structural response change trends and corresponding weak parts were determined according to the performance points, resulting in an overall analysis of the seismic performance of the structure. The research results show that the chimney structure meets the 7 degree fortification requirements under rare earthquake, and the seismic performance of the chimney can be further improved through the improvement of hole cross-section, reinforcement of rebar around holes and increase of cross-section thickness of the structure. This study provides some references and significances for the design and construction of special-shaped chimneys in high seismic intensity areas.
Keywords:special-shaped chimney; gradual incremental time-history dynamics analysis; seismic performance
*江蘇省普通高校研究生科研創(chuàng)新計(jì)劃項(xiàng)目（KYLX_0150）。
作者簡介：朱峰岐，博士研究生，Email：fengqizhu_seu@qq.com。
- 下載地址
-
