| Both field test,finite element and theoretical analysis were conducted in this paper to study the human-induced force and structural vibration.The walking and running loads were modelled through Fourier series.The vibration response of the Large-span Steel-concrete Composite Beam with Precast Hollow Core Slabs(CBHCS)due to human activities was studied.The details are as follows:(1)The load-time history curves of 25 testers under walking and running excitation were obtained by using force mearsuing plate.The relationship between the dynamic load factors according to the Fourier series and the duration of single-step excitation was obtained,thus the modelling loads of walking and running were carried out.(2)The acceleration-time histories of seven specimens of CBHCSs with different parameters include span,width and shear connection degree were tested under human-induced impact(heel-drop,jumping,walking and running).A threshold for evaluating the vibration serviceability of was conducted.(3)The finite element models of the CBHCSs were established through program ABAQUS.The natural frequencies and acceleration-time histories of the models were obtained.The accuracy of the finite element models were verified by comparing the results with the tests.Based on the finite element models,the validity of the modelling loads under walking and running were verified.The influence of the hollow core slab(HCS)thickness,the steel beam dimension,the single-step excitation duration and the exciter weight on the natural frequency and acceleration-time history of CBHCS was studied.(4)Based on the vibration motion equation of the bending beam,the theoretical formulas for the natural frequency were derived,and based on the single-degree of freedom system,the peak acceleration of the CBHCS were obtained,and their applicability was verified. |
