L、T、十形截面型钢混凝土异形柱滞回性能对比分析

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。

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

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.