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通过16个试件的低周反复荷载试验,对SRC-RC竖向混合结构转换柱的受力性能进行了研究。转换柱的破坏形式可分为剪切破坏、弯曲破坏和粘结破坏。对转换柱特殊的破坏过程和破坏形态进行了描述和分析,并结合箍筋应变在整个加载过程中的发展变化状况,揭示了其破坏机理。根据转换柱特有的构造形式提出了等效剪跨比的概念,用于反映型钢局部存在对转换柱抗剪承载力的影响,给出了计算剪跨比与等效剪跨比的换算公式。给出了便于工程应用的抗剪承载力计算公式,计算结果与试验结果符合较好。
The mechanical behavior of SRC-RC vertical mixing structure column was studied by low-cycle cyclic loading test of 16 specimens. Transformation column damage can be divided into shear damage, bending damage and bond damage. Described and analyzed the special failure process and failure mode of conversion column, and combined with the development and changes of the stirrup strain during the whole loading process, the failure mechanism was revealed. The concept of equivalent shear span ratio is proposed according to the unique structure of conversion column, which is used to reflect the effect of local existence of profile steel on the shear capacity of transfer column. The formula for calculating shear span ratio and equivalent shear span ratio is given. The formula for calculating shear capacity is given, which is in good agreement with the test results.