等截面钢管混凝土格构柱骨架曲线的统一算法

A uniform calculation method of the skeleton curve of equal sectional concrete filled steel tube columns

介绍了斜缀管式和平缀管式等截面钢管混凝土格构柱骨架曲线的计算方法并进行评价分析。研究表明,不同缀管布置形式的钢管混凝土格构柱,其抗震性能具有共性。借鉴钢管混凝土单肢柱的计算框架,开展等截面钢管混凝土格构柱骨架曲线的统一算法研究,对弹性刚度、水平峰值荷载、峰值荷载位移、下降段刚度等主要参数的计算方法进行了深入探讨和算例分析,并以干海子大桥格构柱墩为研究对象,采用OpenSEES有限元程序,对骨架曲线算法进行工程实例验证。研究结果表明,计算值与试验值及有限元计算结果均吻合良好。最后提出了适合工程应用的等截面钢管混凝土格构柱骨架曲线的统一简化算法,为钢管混凝土计算理论的进一步完善和规程编撰提供参考。

The calculation methods of skeleton curve of equal sectional CFST （concrete filled steel tube） columns with flat or inclined lacing tubes were introduced and analyzed. It＇s found the seismic behavior of equal sectional CFST columns has generality, no matter their lacing tubes are flat or inclined. To find out a uniform calculation method of skeleton curve of equal sectional CFST columns on the base of hysteretic model of CFST single tube column, we explored the calculation methods of elastic stiffness, horizontal peak load, peak load displacement and fall-period stiffness, and then carried out a verification experiment with OpenSEES program by taking the laced column pier of Ganhaizi bridge as an example. Research results indicate that the calculated values of the new calculation method are coincident well with the test and the numerical results. Finally the uniform method which can be adapted to engineering application is provided, and it can provide references for the calculation theory and relevant criteria of CFST structures.