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李國強 謝衛(wèi)兵 沈祖炎
（同濟大學 上海 200092）[提要] 本文首先將高層支撐鋼框架結構分解成純框架和純支撐體系兩部分，并與一列受載鉸接剛性桿并聯(lián)，以考慮幾何非線性的影響；然后將框架部分簡化為半剛架，將支撐體系部分簡化為鉸接桁架，以此進行結構彈塑性地震反應分析。在前人試驗和理論研究成果的基礎上，本文還提出了能準確反映鋼支撐主要滯回特征的支撐恢復力模型，便于工程實用。通過算例對比分析，表明采用本文提出的高層支撐鋼框架簡化模型進行彈塑性地震反應分析，具有計算精度高、計算自由度少、計算時間省的優(yōu)點，是一種有效的近似方法。
[關鍵詞] 高層結構 支撐鋼框架 彈塑性 地震反應 簡化模型Regarding a tall braced steel frame as a frame plus a bracing system, the analysis of the structure can be simpiified. The frame part of a braced frame can be simplified as a half - frame with only one column each storey, and the bracing part of the braced frame can be treated as a hinged vertical truss. For the analysis of elasto - plastic response of braced steel frames subjected to earthquakes, a practical restoring force model is proposed. It is shown by numerical investigation that the simplified model presented in this paper is effective for predicing the elasto - plastic seismic response of tall braced steel frames.
Keywords: tall building structure; braced steel frame; elasto - plasticity; seismic response
