- 摘 要
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(北京筑信達工程咨詢有限公司， 北京 100043)
［摘要］從鋼筋混凝土基本原理出發(fā)，重新推導了對稱配筋矩形柱的臨界軸壓比公式，結果表明：臨界軸壓比設計值應為0.5左右，取決于截面材料屬性，而非0.9；臨界軸壓比的設計值與標準值之比稍大于1.0，而非荷載分項系數(shù)與材料分項系數(shù)之乘積1.63。通過PM相關曲線的簡單數(shù)值算例對推導結果進行了驗證，并采用約束混凝土本構模型對規(guī)范軸壓比限值進行了相關討論。
［關鍵詞］鋼筋混凝土柱；臨界軸壓比；軸壓比限值；PM相關曲線；約束混凝土本構模型
中圖分類號：TU375 文獻標識碼：A文章編號：1002-848X(2021)21-0064-04
Critical and limit values of axial compression ratio for RC column
LI Chushu, LI Li, CHEN Yunbo, WU Wenbo
(Beijing CIS Engineering Consulting Co., Ltd., Beijing 100043， China)
Abstract: The critical axial compression ratio of rectangular reinforced concrete(RC) column with symmetrical reinforcements was re-derived based on the basic principle of RC. The results show that this design value of this ratio for should be 0.5 or so, depend on those material properties of the section, instead of 0.9，and the ratio of design value to the characteristic value of this ratio is just more than 1.0, instead of the product of the partial factor for loads and the partial factor for materials, i.e., 1.63. In order to verify these results a simple numerical example was given by PM interaction cure. The limit value of axial compression ratio from the design codes was also discussed by the confined concrete model.
Keywords:reinforced concrete column； the critical axial compression ratio； the limit value of axial compression ratio； PM interaction cure； confined concrete model
作者簡介：李楚舒，博士，教授級高級工程師，Email: lics@cisec.cn。
