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(1.同济大学 土木工程防灾国家重点实验室，上海 200092;2.江西理工大学 土木与测绘工程学院，江西 赣州 341000)
Experiment and Numerical Simulation on the Dynamic Responses for Small-sagged Cables Under Support Excitations
(1.State Key Lab. of Disaster Reduction in Civil Eng., Tongji Univ., Shanghai 200092, China;2.School of Civil and Surveying & Mapping Eng., Jiangxi Univ. of Sci. and Technol., Ganzhou 341000, China)

Abstract:The cable-net supported glass roof is commonly located between adjacent structures, however, the relative displacement vibration of the main structure will be considered as the support excitation leading to over-tensioning or relaxation of the small-sagged cables. In order to investigate dynamic responses of small-sagged cables under support harmonic and stochastic excitations. Dynamic responses of three sets of specimens under the support harmonic excitation are tested with the dimensionless deformation parameter $\alpha {b^2}$, as the design variable, which integrates the influence of the sag-span ratio, tensions, and linear stiffness on the vibration of small-sagged cables. The two loading cases are set up by adjusting the loading amplitude and frequency for analyzing displacements and cable tensions under different $\alpha {b^2}$. Then, by using ANSYS, the calculated results agree well with the experimental results, thus verifying the correctness of the numerical simulation method. Finally, taking the ideal Gaussian white noise as the stochastic excitation, the paper calculates the dynamic response based on the validated numerical model and discusses the effects of $\alpha {b^2}$, the damping ratio and the excitation intensity on response spectrums and mean square deviations. Results show that: 1) Displacements and tension responses under support harmonic and stochastic excitation decrease with increasing $\alpha {b^2}$ and damping ratio, and increase with increasing excitation intensity. Especially for cables with large $\alpha {b^2}$, their displacement and tension responses are more sensitive to excitations; 2) When the damping ratio is less than 0.1, with the increased damping ratio, the displacement and tension responses of the cable under stochastic excitation decrease by 60.9% and 67.5%, respectively, indicating that the dynamic responses under this stage are more sensitive to the damping ratio, and the effect brought by increasing damping is significant; 3) When harmonic excitations and cable force are the same, the sag-span ratio has less effect on the dynamic displacement of small-sagged cables but has a significant effect on cable tensions, in which the change of tensions are more drastic for the cable with a smaller sag-span ratio.

WANG Guowei,ZHANG Peng,LU Wensheng.Experiment and Numerical Simulation on the Dynamic Responses for Small-sagged Cables Under Support Excitations[J].Advanced Engineering Sciences,2022,54(6):166-175.