Study On The Vibration Comfort Of The Composite Tubular Truss Floor Induced By Man

Along with the development of our country’s economic and the improvement of science andtechnology, more and more sleek, novel structure of multilayer large-span spational structurehas been developed rapidly.Especially for the floor layer,it is crucial to meet the requirementsof large-span,light-weight and high strength when designing. Various forms of composite floorhas been widely applied for its advantages,At present, the study for the new composite tubulartruss floor is few in our country,however,under the walking,running and other nomalactivities,these large-span floor structure is easy to be excited vibration and evenresonance,which will cause discomfort and panic for people.Therefore,here with the compositetubular truss floor structure as the research object,has carried out the analysis of man-inducedstructure vibration reponse and vibration comfort influence factors based on human bodyvibration comfort.Based on the inspection of the relevant literature at home and abroad, selected the Fourierseries pedestrian load model,established a corresponding vibration comfort evaluationcriteria,and through the finite element software SAP2000the composite tubular truss floorstructure analysis model is established, As the floor is relatively vertical soft, its verticalvibration model distribution is a bit dense, and it becomes very easy to produce resonance forits vertical vibration fundamental frequency is within the scope of people’s one-stridefrequency.The vibration response under the crowd is more acute relative to a single one, andthere exits an exponential function relationship between the crowd number and the responseacceleration peak value.Here we primarily analyzed the length-width ratio of floor, truss depth-span ratio, thicknessof concrete layer, and the construction function as parameters’impact on its vibration comfort:when the floor length-width ratio accrete, the natural frequency of structure vibrationdecreases as well, and their change law can be described well by function relationship;Thetruss height give a greate influence on the structure stiffness, with which height increased thestructure natural vibration frequency increased sharply as well as the vibration responsereduced, and it can be seen a more obvious economic benefit of the change of truss height inthe structure vibration comfort design. As part of structure quality source, the value of live load on the floor will directly affect the dynamic characteristics of structure, and a reasonablevalues of it play a very important role in the structure vibration comfort design also.