预制混凝土管组合柱受剪性能试验研究

为研究预制混凝土管组合柱的受剪性能，完成了12个预制混凝土管组合柱试件和3个预制混凝土空心管对比试件的受剪试验，分析了剪跨比、轴压比、配箍率和填充混凝土强度对各试件受剪承载力、变形性能以及破坏形态的影响。结果表明：各试件均出现剪压破坏模式，主斜裂缝夹角介于28°~41°之间；剪跨比和轴压比对预制混凝土管组合柱受剪性能有较大影响，增大剪跨比使得受剪承载力降低，但变形能力提高显著，增加轴压比使得受剪承载力提高，但变形能力降低；与预制混凝土空心管试件相比，填充混凝土的存在使得预制混凝土管组合柱受剪承载力提高，变形能力显著改善。提出了适用于预制混凝土管组合柱的受剪承载力计算式，其预测值与试验结果吻合较好。

Experimental study on shear behavior of concrete-filled precast concrete tube columns

To study the shear behavior of concrete-filled precast concrete tube (CFPCT) columns, monotonic loading tests were conducted on twelve CFPCT columns and three precast concrete hollow tube columns. The effects of shear span ratio, axial compression ratio, stirrup ratio and strength of filled concrete on the shear capacity, deformation behavior and failure mode of the specimens were analyzed. The test results show that the failure modes of all specimens are shear-compression failure. The angle of main inclined crack ranges from 28° to 41°. Shear span ratio and axial compression ratio have great effect on the shear behavior of CFPCT columns. Increasing the shear span ratio decreases the shear capacity, but significantly increases the deformation capacity. The shear capacity increases with the increase of the axial compression ratio, while the deformation capacity shows an inverse relationship. Compared with the precast concrete hollow tube columns, the shear capacity and deformation capacity of the CFPCT column are improved due to the presence of infilled concrete. The shear capacity formula for CFPCT columns was proposed. The predicted values are in good agreement with the test results.