L、T、十形截面型钢混凝土异形柱滞回性能对比分析

Contrastive Analysis of Hysteretic Performance of L-Shaped,T-Shaped and Cross-Shaped SRC Special-Shaped Column

为了研究截面形状对型钢混凝土(SRC)异形柱滞回性能的影响,完成了4个L形、6个T形和2个+形截面SRC异形柱构件的低周反复荷载实验,并获取了此类构件的破坏形态和滞回曲线。在此基础上,对比分析了截面类型对SRC异形柱在耗能能力、变形性能及地震损伤等方面的影响。研究结果表明:型钢混凝土异形柱的破坏形态与剪跨比有关,剪跨比大的试件易发生弯曲型破坏,而小剪跨比的试件易发生剪切型破坏;L形柱的滞回环捏拢程度最大,其次为T形柱,最后为+形柱;+形柱和L形柱的相对受剪承载能力和耗能能力均比T形柱大;T形柱的变形能力要优于L形柱;型钢混凝土异形柱构件的相对损伤累积程度与柱肢数有关,其主要表现为随着柱肢数的增多,异形柱的损伤发展水平加快。

In order to understand the effect of cross-section form on hysteretic performance of steel reinforced concrete（SRC）special-shaped column,four L-shaped,six T-shaped and two cross-shaped SRC special-shaped columns were subjected to low cyclic loading test,the failure mode and hysteretic curve of specimen were obtained.Based on experimental results,the effect of cross-section form on energy dissipation capacity,deformation properties and earthquake damage of SRC special-shaped column was contrastively analyzed.Results show that the failure mode of SRC special-shaped column is related to shear-span ratio,that is to say,specimen with larger shear-span ratio is prone to flexural failure,while specimen with smaller shear-span ratio is prone to shear failure.The hysteresis loop pinching degree of L-shaped column is the largest,the second one is T-shaped column,and the third one is cross-shaped column.The relative shear bearing capacity and energy-dissipating capacity of both cross-shaped column and L-shaped column are larger than that of T-shaped column.The deformability of T-shaped column is superior to that of L-shaped column.The relative damage accumulation degree of SRC special-shaped column is related to the column limb number,that is to say,with the increase of column limb number,the damage development of specimen is faster.