Abstract
An extensive experimental and numerical research was undertaken to study the vibration serviceability of a long-span fanshaped prestressed concrete floor system to be used in the lounge of a major airport. Specifically heel-drop and jumping impact tests were conducted to obtain the natural frequencies and modal damping ratios of the floor system, followed by the discussion on the distribution of peak accelerations. Running tests and simulation were also performed to capture the acceleration responses. Moreover, the finite element method was used to evaluate the dynamic characteristics. The floor system is found to have a low fundamental frequency (≈6.00 Hz) and the corresponding modal damping ratio (average ≈2.20%). The comparison of the experimental results with the published American institute of steel construction (AISC) design guide indicates that the prestressed concrete floor system exhibits satisfactory vibration perceptibility overall. The study results also show that the intensity and the location of impact excitation have a significant influence on the rate of acceleration decay. A crest factor βrp is proposed based on the test results to calculate the maximum root mean square acceleration for running for convenience.
Highlights
In recent years, light-weight and long-span floor system, such as the prestressed concrete (PC) floor,[1,2] prestressed cable reinforced concrete (RC) truss floor,[3] multifunctional slab system,[4,5] composite floor system using cellular beams,[6] hybrid composite floor,[7] crosslaminated-timber floors,[8] and cable supported beam structure-concrete slab composite floor,[9] is a basic component of the infrastructure
Large-span floors have been widely applied in airports, which have played an important role as a kind of transportation structures
Due to lower vertical frequency, lighter mass, and smaller damping, the floor system is susceptible to the human activities[10], and vibration serviceability problem may arise if an excessive vibration is beyond a certain limit, resulting in discomfort and even psychological fear to occupants.[11]
Summary
Light-weight and long-span floor system, such as the prestressed concrete (PC) floor,[1,2] prestressed cable reinforced concrete (RC) truss floor,[3] multifunctional slab system,[4,5] composite floor system using cellular beams,[6] hybrid composite floor,[7] crosslaminated-timber floors,[8] and cable supported beam structure-concrete slab composite floor,[9] is a basic component of the infrastructure. Large-span floors have been widely applied in airports, which have played an important role as a kind of transportation structures.
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