Experimental Study On Vibration Comfort Of Two-way Composite Slab By Steel Bar Truss And Concrete

Along with the rapid development of industrialization of residential steelstructure in China, composite floor slab is widely used in buildings, and the steelbar truss floor deck stands out conspicuously with its unique advantages in the floorsystem. However, there are not many researches about a variety of performance ofsteel bar truss floor deck, including the problem of vibration comfort, which lacksrelevant theoretical basis. On the basis of the summery about domestic and foreignresearch of the floor vibration performance, a full size of experiment is made in thisarticle in order to study the problem of vibration comfort of two-way compositeslab by steel bar truss and concrete. We have designed four specimen made bydifferent plate type in the test, we change the boundary constraint condition and thetest item is divide into two parts. First the static load was carried out on the floorand we got the vertical displacement. The second part is a dynamic environmentaltest. Natural frequencies of the floor and acceleration are collected by loadingdifferent dynamic actions.We get the influence factors, including plate type, the thickNess of the floor,hole telos stud and boundary conditions, by processing and comparing theexperimental data.In order to make up the disadvantages caused by few specimen, the finiteelement analysis software ANSYS was used to make static and modal analysisabout the vertical displacement and frequency of the slabs under different workingconditions by changing width, span and aspect ratio.Through experiments and finite element analysis, the natural frequencies ofthe floor will decrease after floor live load is considered.The slab’s naturalfrequencies increase, which adopted by fixed boundary. In addition, large-spanfloor should be avoided in the structural design.Based on the analysis of the research we found that the loading mode of thetwo-way plate is different from one-way plate.As a result,its deflection andfrequency calculation can not to use the formula of one-way plate.But the data calculated by the method of plate and shell theory are different from the measuredvalues. According to the trial result, the thinks that the method of plate and shelltheory is applicable, but the influence of concrete cracking and other factors shouldbe considered.At last, author put forward the correction formula to calculate thedeflection and frequency of two-way steel bar truss plate.Finally, by using the revised formula, we calculated the the deflection andfrequency of slabs, which are in the normal service condition.The result areacceptable.