設防烈度地震設計的雙層球面網殼抗震性能分析
蔡思思1，鄧華1,2，干鋼2
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（1 浙江大學空間結構研究中心， 杭州 310058； 2 浙江大學建筑設計研究院， 杭州 310028）［摘要］考察了雙層球面網殼按設防烈度進行抗震設計的合理性。以24個典型雙層球面網殼模型為算例，將其構件截面分別按滿足“小震彈性”、“中震不屈服”和“中震彈性”進行驗算，分析了網殼用鋼量的變化。進一步對滿足中震驗算的各算例模型進行罕遇地震下的彈塑性時程分析，其中地震動采用由規(guī)范反應譜生成的三向人工波?？疾炝司W殼跨度、矢跨比、支座連接條件以及下部結構形式對結構塑性區(qū)域、塑性發(fā)展程度以及殘余變形的影響。結果表明，即便是將雙層球面網殼的構件截面驗算提高到滿足“中震彈性”的性能水平，也并不會引起結構用鋼量的顯著增加，同時又能滿足了“中震可修”和“大震不倒”的設防要求。［關鍵詞］雙層網殼； 球面網殼； 設防烈度地震； 彈塑性動力響應； 性能化抗震設計中圖分類號：TU393.3 文獻標識碼：A 文章編號：1002-848X(2013)15-0053-05Investigation on behaviors of double-layer spherical reticulated shells under seismic precautionary intensityCai Sisi1, Deng Hua1,2, Gan Gang2(1 Space Structures Research Centre, Zhejiang University, Hangzhou 310058, China; 2 Architectural Design and Research Institute of Zhejiang University, Hangzhou 310028, China)Abstract: The rationality is investigated for double-layer spherical reticulated shells which are designed on the basis of seismic precautionary intensity.The 24 typical double-layer spherical reticulated shell models are employed as illustrative examples. The cross sections of their members are designated to be satisfied with the check for “elastic design under frequent occurred earthquake”, "non-yielding design under seismic precautionary intensity”and “elastic design under seismic precautionary intensity” respectively, and structural steel consumptions are compared correspondingly. For those models satisfied with the check seismic precautionary intensity, their elasto-plastic dynamic responses under seldom occurred earthquake are also calculated based on time-history analysis. A three-direction artificial earthquake wave generated according to the code response spectrum is adopted. The structural plastic region, magnitude of plastic strain and residual deformation effected by the span of shell, rise-span ratio, connection condition of abutment and layout of substructure are further analyzed.The results reveal that the structural steel consumption increases very limitedly even though the member cross sections of double-layer reticulated shells are checked according to the performance level of “elastic design under seismic precautionary intensity”. Meanwhile, the fortification requirements of “repairable under moderate earthquake” and “no collapsing under seldom occurred earthquake” are also satisfied.Keywords: double-layer reticulated shell; spherical reticulated shell; seismic precautionary intensity; elasto-plastic response; performance-based seismic design通訊作者：鄧華，工學博士，教授，博導，Email:denghua@zju.edu.cn。參考文獻［1］董石麟，羅堯治，趙陽.新型空間結構分析、設計與施工［M］.北京:人民交通出版社,2006.［2］劉河江，鄧華.罕遇地震下雙層球面網殼的彈塑性動力響應分析［J］.振動與沖擊,2012,31(24):170-177.［3］GB 50011—2010建筑抗震設計規(guī)范［S］.北京:中國建筑工業(yè)出版社，2010.［4］周穎，呂西林.中震彈性設計與中震不屈服設計的理解及實施［J］.結構工程師，2008,24(6):1-12.［5］GB 50009—2001建筑結構荷載規(guī)范［S］.北京:中國建筑工業(yè)出版社，2006.［6］黃旭樂.網格結構多維地震響應計算方法的對比研究［D］. 杭州:浙江大學,2011.［7］謝道清, 沈金, 鄧華，等.考慮受壓屈曲的圓鋼管桿單元等效彈塑性滯回模型［J］. 振動與沖擊, 2012,31(6): 160-165.
