對有側移框架柱計算長度擬合公式的改進建議
劉毅，朱占友，李戰(zhàn)平，白紹良
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(重慶大學土木工程系，重慶 400045)［摘要］《混凝土結構設計規(guī)范》(GB50010—2002)第7.3.11條給出的用于計算有側移鋼筋混凝土框架柱偏心距增大系數η的柱計算長度l0表達式，是對根據彈性穩(wěn)定理論確定有側移框架柱計算長度的分離桿件法理論解的近似擬合公式，它適用于常規(guī)梁、柱尺寸的多層框架。在高層建筑框架部分的若干常見情況下，該式將給出誤差過大的計算結果。為此，對分離桿件法理論解和規(guī)范式之間的誤差變化規(guī)律做了系統(tǒng)分析，提出了兩種與理論解符合程度有明顯改善的修正擬合公式，供工程設計及今后修訂規(guī)范參考。［關鍵詞］框架柱； P-Δ效應；柱計算長度Opinions for modifying fitting formula of effective length based on member isolation method of sway columnLiu Yi, Zhu Zhanyou, Li Zhanping, Bai Shaoliang(Faculty of Civil Engineering, Chongqing University, Chongqing 400045, China)Abstract:The column effective length l0 expression 7.3.11 in GB50010—2002 Code for Design of Concrete Structures used to calculate eccentricity augment coefficientηof column in sway concrete structures is approximately formula fitting theory solution from the member isolation method of sway column in elastic stability theory, which is adapt to multistory structures having general girder and column dimension. In some cases of frame portion of high buildings, large error will occur on this expression. The regularity of error between theory solution from the member isolation method and formula l0 in code are systematically analyzed, and two kinds of modifying fitting formula for engineering design and revising code are proposed.Keywords:column; P-Δeffect; column effective length
