Study On Comfortableness Of Composite Slab Of Thin-walled Steel-Italian Poplar Plywood

China’s economic development has achieved remarkable results since the21st century. Withthe continuous improvement of living standards, people start to turn their pursuit of building tolightweight structure and unique shape, which promotes the adoption of new structural systems,the improvement of construction techniques, and the use of lightweight and high strengthmaterials in civil engineering. Under the trend, studying team designed a new composite slab ofthin-walled steel-Italian poplar plywood, which use their excellent performances to make full useof the resource-rich Italian poplar, reduce the structural weight and engineering’s costs, improveconstruction speed, and protect the ecological environment. However, the composite slab’svibration comfortableness cannot meet regulatory requirements while the composite slabbecomes lighter and more flexible. This paper studied composite slab’s vibration performanceand its influencing factors deeply, which provided a basis for the future use and design of thiscomposite slab.Based on the extensive existing literature, the pedestrian excitation load model was studieddeeply, which focused on the single-step and the continuous walking load model, as thecomposite slab’s externalexcitation, respectively. The domestic and foreign studies of evaluationcriteria for comfortableness problem induced by the pedestrian excitation load were summarizedand analyzed, and the analytical method and evaluation criteria of the composite slab vibrationcomfortableness were proposed.14composite slabs of thin-walled steel-Italian poplar plywood were produced. Thecomposite slab consisted of two sheets of Italian poplar plywood for both sides and a thin-walledsteel between them. The two sheets of Italian poplar plywood and the thin-walled steel werepasted by high-strength structural adhesive and self-tapping screws were shot into the adhesivesurface. The longitudinal sides of the composite slab were sealed by Italian poplar plywoodbattens which were connected by screws up and down. The test for dynamic property of14composite slabs under environment excitation and heel excitation in two load cases of landed theweigh and applied the weigh (equivalent to quasi-permanent value of floor live loads), and thetest for dynamic response under different pedestrian excitation (slow walk, normal walk, slow jogand march on the spot) were conducted respectively. The characteristics of dynamic property anddynamic response were compared between different test methods and load cases. The factors ofthe vibration performance for composite slabs, which were thickness of thin-walled steel,thickness of plywood, the coupling means, cross-sectional form of thin-walled steel and thescrew spacing were studied.With the general finite element software ANSYS, this paper had simulated the dynamic property and dynamic response for the composite slab of thin-walled steel-Italian poplar plywoodand they were compared with test results, which showed the correctness of the finite elementanalysis. For the problem that the pedestrian excitation load cannot be applied on the compositeslab structures directly in transient dynamic analysis, this paper acted a secondary developmentfor ANSYS and used the APDL to complete the load application parametrically. By using thefinite element analysis method, the dynamic performances of the composite slabs under a varietyof spans were analyzed. With a practical engineering, a steel structure residence, the checkingcalculation for vibration comfortableness of its composite slabs was conducted and this paperprovided suggestions for the design of composite slab of thin-walled steel-Italian poplar plywoodfrom the perspective of comfortableness.