型钢混凝土柱最小体积配箍率研究

Research on the Minimum Stirrup Ratio for Steel Reinforced Concrete Columns

体积配箍率是影响型钢混凝土柱抗震性能的重要因素。为保证地震作用下型钢混凝土柱的延性,《型钢混凝土组合结构技术规程》(JGJ 138—2001)对型钢混凝土柱的最小体积配箍率进行了规定。由于研究尚不充分,规程中对型钢混凝土柱最小配箍率的要求与钢筋混凝土柱相同,给型钢混凝土柱的施工带来较大困难。本文通过试验定量研究了体积配箍率与型钢混凝土柱延性的关系,根据26根型钢混凝土柱低周反复荷载试验结果,拟合出试件延性系数与配箍率的关系式;在此基础上提出型钢混凝土柱的最小配箍率建议公式,并利用有限元分析对建议公式进行了验证。

The stirrup ratio has an important influence on seismic behavior of steel reinforced concrete （SRC） columns. To ensure the ductility of SRC columns, the Technical Specification For Steel Reinforced Concrete Composite Structure （JGJ138-2001） has a restriction for the minimum stirrup ratio for SRC columns. However, this limit value is according to concrete columns while the research on SRC columns is not enough. As a result, the stirrup details of SRC columns become a main problem during the construction process. To solve that problem, twenty-six steel-concrete composite columns are tested under low cyclic reversed loading. Base on the test result, the relation between ductility factor and stirrup ratio is given by linear fitting analysis and a formula of minimum stirrup ratio for SRC columns is recommended which is also verified by FEM analysis.