Influence Of Human Body Parameter Uncertainty On Dynamic Response Of Long Span Structure

With the development of society,the concept of green living is gaining more and more attention,and as the industrialization of construction continues to advance,this concept of living continues to seep into it.Repeated and assembled construction in the building industry has excellent characteristics of being greener and more environmentally friendly than the ordinary way,and such a form of construction is also recognized by more developed countries in the world,gradually leading the construction industry to develop in a different direction.Among them,steel-wood composite floor system as a new type of structure,its sufficient wood resources,light structure weight,low engineering cost,high technical and economic efficiency and short construction period,so that it gradually enter the public’s view.The steel-wood composite floor system echoes the national development strategy of advocating green building and building industrialization,and its application prospect is greatly improved.Due to the use of lightweight and high-strength materials and new construction techniques,the integrity and stiffness of the composite floor system decreases,and the vibration comfort problem becomes a problem that needs to be focused on.Therefore,it is very meaningful to carry out the research work on the structural dynamic response under the action of human-induced load of the new building cover.In this paper,the dynamic response of a large-span steel-wood composite floor cover structure under human-induced loads is systematically analyzed.The main research contents include below.1.The structural analysis model of the new steel-wood composite floor cover was established using the finite element software ABAQUS,and the user subroutine Vdload in ABAQUS was used to simulate the human-induced moving loads.Spring units were used to simulate the human-structure interactions.Preferably,the structural vibration response of the steel-wood composite floor cover under different human-induced loads is carried out by using the stiffness k and damping c of the Spring unit.The computational analysis shows that the simulation results are in good agreement with the measured results,indicating that the structural vibration response under human-structure interaction can be better simulated by using Spring unit and Vdload subroutine.2.The structural dynamic characteristics of the steel-wood composite floor cover under walking load when human-structure interaction is considered are studied in depth.Based on the finite element simulation,the vertical peak acceleration of the building cover structure under fixed-point loading and single-step movement is calculated,and the influence law of human-structure interaction on the structural dynamic characteristics is analyzed.When human-structure interaction is considered,the peak structural acceleration decreases and is closer to the measured situation than the peak structural acceleration without human-structure interaction.When different walking loads are selected,there is a greater influence on the vibration response of the combined building cover.3.The dynamic characteristics of the steel-wood composite floor cover structure under jump load when human-structure interaction is considered are studied in depth.Based on the half-sine square jump load model,the variation of vertical peak acceleration of the large-span composite floor structure under 1.5 Hz and 2.67 Hz jump loads is discussed.The acceleration response of the steel-wood composite floor cover structure under the single-point excitation of jump load at different positions is analyzed,and the effects of human parameters and jump load model on the dynamic response of the large-span structure are investigated.When the jump frequency increases,the effect of human-structure interaction on the structure becomes more obvious and the peak acceleration of the structure decreases to a greater extent.The change of jump frequency has some influence on the vibration response of the combined building cover,and the influence on the structural vibration response is more significant when the jump frequency increases.The different jump load models also have some influence on the vibration response of the structure.4.A systematic study of the vertical peak acceleration of the structure caused by the human under consideration of human-structure interaction was conducted.Two models of ordered arrangement of crowd jumping and random distribution of crowd jumping loads were established to analyze the vibration response of the combined building cover structure under crowd jumping loads.It is shown that the peak acceleration of the structure is reduced by at most 2.5% when the human-structure interaction is considered under the ordered arrangement of the crowd jumping load,while the peak acceleration of the structure is reduced by at most 20.5% when the human-structure interaction is considered under the random crowd jumping load,so the structural vibration response of the large-span composite building cover under the crowd jumping load is calculated and analyzed considering the human-structure interaction.