钢筋混凝土偏压柱承载力计算中的曲率影响系数  

Coefficient of curvature influence in calculation of bearing capacity of reinforced concrete columns

作　　者：陈宝春[1] 林上顺 

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]福建省交通规划设计院,福建福州350002

出　　处：《建筑结构学报》2014年第3期156-163,共8页Journal of Building Structures

基　　金：科技部国际科技合作计划(2009DFA72220)

摘　　要：钢筋混凝土偏压柱的承载力计算需通过弯矩增大系数考虑截面弯矩的二阶效应。弯矩增大系数包含两个影响系数,分别是荷载偏心率对截面曲率的影响系数ζ1和构件长细比对截面曲率的影响系数ζ2。这两个系数在规范GB 50010—2010《混凝土结构设计规范》与JTG D62—2004《公路钢筋混凝土及预应力混凝土桥涵设计规范》中计算方法不尽相同。通过14根钢筋混凝土偏压柱承载力试验,应用规范方法对试件的承载力进行计算并与试验值比较,结果表明:GB 50010—2010取消了ζ2,导致计算的试件承载力小于试验值;而JTG D62—2004中ζ1存在不合理之处,特别是当偏心率较小时,计算的承载力偏大而且偏于不安全。在试验研究基础上,进行有限元参数分析,拟合了ζ1和ζ2计算式。应用收集到的文献试件对其计算精度进行了验证。In calculation of the beating capacity of the eccentrically loaded reinforced concrete columns, in order to consider the second order effect of bending moment in the section, the effect of bending moment enlargement coefficient is used, which includes two factors, i. e. the curvature influence coefficient of eccentricity ζ1 and the curvature influence coefficient of slenderness ratio ζ2 . Some differences exist in the calculation methods of these two curvature influence coefficients among the current China design codes such as the GB 50010--2010 ＇ Code for design of concrete structure＇ and JTG D62--2004 ＇ Code for design of highway reinforced concrete and prestressed concrete bridges and culverts＇. Through the bearing capacity tests of 14 reinforced concrete columns, the column bearing capacities obtained from test results were compared with those calculated by code methods. The results show that the calculated bearing capacity of the specimens by the GB 50010--2010 are lower than the test ones due to the ζ2 is deleted in the code, while the calculation method of ζ1 in JTG D62--2004 is not rational since the calculated bearing capacities are larger than the test ones and tend to be unsafe for structures especially when the eccentricity is small. Based on the experimental research, parametric analyses by the finite element method were carried out, and the calculation formulas for ζ1 and ζ2 were proposed. The accuracy of the proposed calculation method was verified by the collected test results of the references.

关 键 词：钢筋混凝土偏压柱 静力试验 曲率影响系数 承载力 

分 类 号：TU375.3[建筑科学—结构工程] TU317.1