型钢混凝土偏心受压柱的二阶效应研究
首发时间:2010-01-07
摘要:以型钢混凝土(SRC)柱的受力特性为依据,指出其发生二阶变形时的偏心距增大系数已不能采用与钢筋混凝土柱相同的值;在理论分析的基础上,总结了SRC柱偏心距增大系数η的两种求解方法,并采用以极限曲率为参数的偏心距增大法推导建立了SRC柱的η表达公式。给出了国内其他学者在此方面的研究成果,通过算例比较,得出本文建议公式和已有研究公式最大误差小于10%的结论,从而说明本文所提公式精确度高,便于应用。
关键词: SRC偏压柱;二阶效应;偏心距增大系数η;极限曲率
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Study on Second Order Effect of SRC Columns under Eccentric Compression
Abstract:Based on mechanical characteristic of steel reinforced concrete (SRC) columns, it shows that the current bias distance increasing coefficient about RC columns isn’t suitable for SRC columns when the secondary deformation is existed. On the foundation of theoretical analysis, two methods of calculating the bias distance increasing coefficient η are summarized, and the η formula about SRC columns is deducted using eccentricity increase method with ultimate curvature as main parameter. Other η expressions of SRC columns drew by relevant scholars in china are given, and an example is presented to get the result that the maximum error is less than 10% between the suggested formula of this paper and other deducted formulas. It thus indicates the proposed formula has high precision and is convenient for application.
Keywords: SRC eccentric compression columns second-order effect the bias distance increasing coefficient η ultimate curvature
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No.3860151107212628****
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