- 摘 要
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(1 重慶大學土木工程學院， 重慶 400045； 2 中國建筑科學研究院有限公司， 北京 100013)
［摘要］隨著結構中鋼筋混凝土偏心受壓柱長細比、材料強度和軸壓力的增大，壓桿發(fā)生失穩(wěn)失效的風險在增長，但在各國至今使用的混凝土結構設計規(guī)范中均未見給出在已知等效長度的前提下單桿非線性失穩(wěn)峰值承載力的計算方法。為此，利用非線性有限元軟件ABAQUS完成了在各主導參數(shù)常用變化范圍內(nèi)的足夠數(shù)量鋼筋混凝土偏心受壓柱模擬分析計算。以此為數(shù)據(jù)集，在取用規(guī)范規(guī)定的強度失效承載力表達式作為強度失效模型的前提下，通過回歸分析，以調(diào)整系數(shù)-作為主要輔助手段，給出了表達鋼筋混凝土偏心受壓柱從強度失效到失穩(wěn)失效連續(xù)過渡的非線性極限承載力實用表達式。并用到目前為止能收集到的在可靠試驗條件下完成的以細長壓桿為主的試驗結果對所提通用公式的準確性進行了識別。利用建立的非線性分析模型還可完成給定參數(shù)條件下相應壓桿失效類型的識別。
［關鍵詞］鋼筋混凝土； 細長偏心壓桿； 非線性失穩(wěn)極限承載力
中圖分類號：TU375-3文獻標識碼：A文章編號：1002-848X(2019)05-0100-09
Study on nonlinear buckling bearing capacity of reinforced concrete eccentrically compressed long column
Bai Shaoliang1, Gong Huaxu1, Wang Min1, Zhu Aiping2
(1 School of Civil Engineering, Chongqing University, Chongqing 400045, China; 2 China Academy of Building Research, Beijing 100013, China)
Abstract:With the increase of the slenderness ratio, the material strength and the axial pressure of the reinforced concrete eccentrically compressed column, the risk of instability failure of the compression member increases, but the calculation method for nonlinear buckling ultimate bearing capacity of the compression member on the premise of known equivalent length have not been given by the concrete structure design code used in various countries. The nonlinear finite element software ABAQUS was used to simulate and calculate a sufficient number of the reinforced concrete eccentrically compressed columns in the range of the common parameters. Based on this data set and regression analysis, the practical expression for the nonlinear ultimate bearing capacity of reinforced concrete eccentrically compressed column was given on the premise of accessing the expression for strength failure bearing capacity specified in the current code as the strength failure model, which could apply to the continuous transition from the strength failure to the instability failure, with adjusted factor - as a major means of auxiliary. The accuracy of the proposed general expression has been identified by the test results mostly based on compression slender members which could be collected under the condition of reliable test up to now. Under the condition of given parameters, the nonlinear analysis model could also be used to identify the failure type of the corresponding compression member.
Keywords:reinforced concrete; slender eccentrically compressed member; nonlinear buckling ultimate bearing capacity
作者簡介：白紹良，博士，教授，博士生導師，Email：Shaoliangbai@126.com。
