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Quasi-static cyclic loading experiment and analysis of double-side slotted steel tube shear damper

Hui Cun, Zhou Zhongyi, Li Yonggang, Jiao Yongkang, Hai Ran

Archives of Civil and Mechanical Engineering

2023

Vol. 23, no. 1

art. no. e45, 2023

The traditional shear type damper is optimized, and a low-cost double-sided slotted steel tube shear damper with steel tube is proposed. The elastic-plastic deformation in the plane of the slotted steel plate on the side of the steel tube is used to absorb the seismic energy to achieve the purpose of vibration reduction. Taking the height, width, joint width and wall thickness of the bending element as the design parameters, four groups of nine double-sided slotted steel tube shear dampers are designed and quasi-static tests are carried out to study the effects of different design parameters on their working performance, energy dissipation capacity and failure characteristics. The test results show that the damper has strong plastic deformation capacity, good seismic performance and energy dissipation capacity. The hysteretic curve is symmetrical and full, which is similar with shuttle shape. The yield displacement is small, but the deformation capacity is strong. Properly increasing the width of bending element and the wall thickness of steel tube is helpful to energy dissipation. The finite element model of the damper is established, and the simulation results are in good agreement with the test results, which verifies the correctness of the finite element model and can provide some reference for related engineering applications.

Seismic performance of circular reinforced concrete columns subjected to compression, bending and torsion with low and moderate shear span ratio

Jiao Chiyu, Liu Yang, Wei Biao, Li Jianzhon, Hu Zhangliang, Zhu Gexi

Archives of Civil and Mechanical Engineering

2021

Vol. 21, no. 3

836--851

Under the action of an earthquake, the piers of urban curved bridges are usually subjected to compression, bending and torsion due to the geometric irregularity and with low and moderate shear-span ratio. To explore the seismic performance of piers under combined actions, this paper made a theoretical analysis on the seismic performance of four circular RC columns under combined action with low and moderate shear-span ratio through experimental research. Taking the shear-span ratio and torsion-bending ratio as the main variables, cyclic bending loading and combined cyclic bending and torsion loading were carried out on the columns, respectively. The results showed that the increase of torsional effect and shear effect will increase the failure height of the piers and weaken the energy dissipation capacity and bearing capacity. Through the extraction of characteristic points in the test data, the relationship between force, displacement and torsion-bending ratio of columns with shear-span ratio below 4 was fitted. The bending and shear restoring force models of columns with spiral stirrups and small torsion-bending ratio were established. Moreover, based on the variable angle truss theory, the concrete improvement coefficient β was introduced, and the formula of torsional bearing capacity of columns under combined actions with low and moderate shear-span ratio was deduced. Compared with the test data, when the value of β was taken as 1.1, the proposed formula could be well applied to the calculation of bearing capacity of piers with torsion-bending ratio below 0.2 under combined actions with low and moderate shear-span ratio.