【摘要】：針對SCFT柱-H型鋼梁平面框架,采用ANSYS建立非線性模型,進行了7組框架模型在低周反復(fù)荷載作用下的受力特性分析,研究了軸壓比和有無填充墻對SCFT柱框架力學(xué)性能的影響規(guī)律.分析發(fā)現(xiàn):7組框架模型滯回曲線飽滿,骨架曲線下降段平緩;在受壓單肢鋼管受壓區(qū)達(dá)到屈服強度時,SCFT柱仍可視為整體受力構(gòu)件并繼續(xù)承擔(dān)更大荷載,有效延緩整體框架的塑性變形,因此,SCFT柱框架具有良好的抗震性能;軸壓比對SCFT柱框架的剛度退化影響并不明顯,隨軸壓比增加,框架的極限承載力和延性有所降低,達(dá)到極限承載力后的強度退化明顯;填充墻在SCFT柱框架加載前期能夠有效分擔(dān)水平荷載,顯著提高框架承載力和彈性剛度,但剛性連接會加劇墻體過早壓碎破壞,建議工程中采取柔性連接或預(yù)留縫隙,以減小填充墻震害,并改善墻體與SCFT柱框架的協(xié)同工作性能.
[Abstract]:Aimed at the plane frame of SCFT column-H steel beam, the nonlinear model was established by ANSYS, and the mechanical characteristics of seven groups of frame models under low cyclic loading were analyzed. The influence of axial compression ratio and filled wall on the mechanical properties of SCFT column frame is studied. It is found that the hysteretic curve of the 7 groups of frame models is full and the descending section of the skeleton curve is smooth, and that the SCFT column can still be regarded as a whole bearing member and continue to bear a larger load when the compressive zone of the single leg steel tube reaches yield strength. The plastic deformation of the whole frame is effectively delayed, so SCFT column frame has good seismic performance, the stiffness degradation of SCFT column frame with axial compression ratio is not obvious, with the increase of axial compression ratio, the ultimate bearing capacity and ductility of SCFT column frame decrease, and the ultimate bearing capacity and ductility of SCFT column frame decrease with the increase of axial compression ratio. When the ultimate bearing capacity is reached, the strength degradation is obvious, the infilled wall can share the horizontal load effectively in the early stage of SCFT column frame loading, and the bearing capacity and elastic stiffness of the frame can be improved significantly, but the rigid connection will aggravate the premature crushing failure of the wall. It is suggested that flexible connection or reserved gap should be adopted in order to reduce the earthquake damage of infilled wall and to improve the cooperative working performance of wall and SCFT column frame.
【作者單位】： 天津大學(xué)建筑設(shè)計規(guī)劃研究總院;天津大學(xué)建筑工程學(xué)院;天津大學(xué)建筑學(xué)院;
【分類號】：TU392.1;TU352.11

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