异形钢管混凝土整体框架静力弹塑性分析

Pushover Analysis of Special-shaped Concrete-filled Steel Tubular Frame

为研究异形钢管混凝土整体框架的抗震性能,将相同条件下的异形钢管混凝土框架与钢筋混凝土框架进行了对比.对一个原6层钢筋混凝土框架建筑,采用异形钢管混凝土框架进行建模,并与原钢筋混凝土框架模型分别进行了框架的破坏机制、Pushover曲线、刚度、延性、以及性能点处的层间位移角分析.结果表明,相同面积的异形钢管混凝土柱和钢筋混凝土柱各自组成的框架,异形钢管混凝土框架的承载力比钢筋混凝土框架要大得多,在倒三角工况和均布力工况下,承载力分别提高了6.23与5.58倍;异形钢管混凝土框架塑性铰的出现顺序满足"强柱弱梁"的设计准则;破坏时,塑性铰的变形程度要深于钢筋混凝土框架,异型钢管混凝土框架和钢筋混凝土框架的变形曲线均为剪切型,且最大层位移角均出现在第2层;在性能点处异形钢管混凝土框架的层位移要小于钢筋混凝土框架.

For studying the seismic performance of the special-shaped concrete-filled steel tubular frame,this paper compares the special-shaped concrete-filled steel tubular frame with the reinforced concrete frame under the same conditions. For a former six-story reinforced concrete frame construction,we use new design of the special-shaped concrete frame,and compare both frames by seismic analysis,and also make a simple economic contrast. We analyze failure mechanism,pushover curve,stiffness,ductility as well as performance point story drift angle. The analysis results indicate that for the special-shaped concrete-filled steel tubular frame and the reinforced concrete frame under the same conditions,the bearing capacity of the special-shaped concrete-filled steel tubular frame is much greater than that of the reinforced concrete frame. Under the inverted triangle conditions and the uniform force conditions,it is increased respectively by 6. 23,5. 58 times. The appearance order of the plastic hinges of the special-shaped concrete-filled steel tubular frame meets the ＂strong column-weak beam＂ design guidelines. When damaged,the deformation degree of the plastic hinges is deeper than that of the reinforced concrete frame. The deformation curves of the special-shaped concrete-filled steel tubular frame and the reinforced concrete frame are both cut-type,and the maximum drift angle are both in the second layer. The drift in the performance point of the special-shaped concrete-filled steel tubular frame is less than that of the reinforced concrete frame.