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    顧強(qiáng)強(qiáng)，  湯小軍
    （中國(guó)航空規(guī)劃建設(shè)發(fā)展有限公司，北京100120）

[摘要] 圓形截面的鋼筋混凝土煙囪在風(fēng)荷載作用下的受力性能已有較為成熟的研究成果，但鋼筋混凝土方煙囪目前還研究較少，尤其是在風(fēng)荷載作用下的內(nèi)力分布。通過對(duì)東莞一套筒式鋼筋混凝土方煙囪采用MIDAS軟件進(jìn)行風(fēng)荷載作用下的有限元分析，得出其受力特點(diǎn)，包括模態(tài)分析得出其周期和振型分布、風(fēng)荷載作用下的軸力和位移分布、剪力滯后效應(yīng)隨高度增高而逐漸減弱、煙囪墻體從受拉控制逐漸變?yōu)槭軌嚎刂?、傾覆彎矩隨高度的變化情況、安裝洞及煙道進(jìn)口處的應(yīng)力分析。通過受力分析對(duì)煙囪重點(diǎn)部位進(jìn)行加強(qiáng)以保證結(jié)構(gòu)的整體性能和使用安全，并對(duì)方煙囪的橫向風(fēng)振進(jìn)行了探討。
[關(guān)鍵詞] 方煙囪；有限元；模態(tài)分析；剪力滯后；傾覆彎矩；橫向風(fēng)振
中圖分類號(hào)：TU279.7 +42  文獻(xiàn)標(biāo)識(shí)碼：A  文章編號(hào)：1002-848X(2011) S2-0183-05

    Analysis and research of reinforced concrete square clumney
    Gu Qiangqiang, Tang Xiaojun
    ( China Aviation Planning and Construction Development Co., Ltd., Beijing 100120, China)

Abstract: The basic mechanical behavior of circular cross section of the chimney in wind load has a mature research achievement, but far less square clumney, especially the intemal force distribution in the wind load. Through the finite element analysis on the canular multibulb chimney in Dongguan using MIDAS, the mechanical characteristics of which was obtained, including the period and mode of vibration distribution through the modal analysis, the axial force and displacement distribution in wind loads, the shear lag effect gradually decreasing wlule height increasing, the chimney wall gradually becoming pressure control from the tensile control and overthrow bending moment change situation with height, the stress analysis of installation holes and flue inlet. The stress analysis on clumney key parts was done in order to strengthen and ensure the integral structure performance and security. The chimney lateral wind vibration was discussed.
Keywords: square chimney; finite element, modal analysis; shear lag effect, overthrow bending moment, lateral wind vibration