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The vibration control of the cantilevered floor as a case study can serve as reference for the application of TMDs. The acceleration response was significantly reduced with a maximum reduction effect of 64% after the installation of TMDs, resulting in satisfactory vibration serviceability of the cantilevered floor the numerical simulation of that agreed well with the dynamic testing results. The FRF method could provide a fast and conservative vibration evaluation, in which the maximum acceleration response was 26% higher than that from dynamic testing. The results showed that the maximum acceleration response of the cantilevered floor under the running load exceeded the limit, which was on average nine times that of the values under the walking condition. A passive TMDs system was applied to reduce the vibration response the vibration control of the cantilevered floor with TMDs was also evaluated by the dynamic testing with a single pedestrian and groups of pedestrians. A fast-evaluated frequency response function (FRF) method suggested by AISC Design Guide 11 was also used to evaluate the vibration response and further verified by the dynamic testing.
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The human-induced vibration response under walking and running conditions were firstly presented based on a series of dynamic testing with a single pedestrian and groups of pedestrians. The vibration control of a cantilevered floor with tuned mass dampers (TMDs) was investigated using dynamic testing and numerical simulation methods to better satisfy the structural serviceability requirement. The presented work would enhance the accuracy and maintain the simplicity and convenience of the design guideline. The application of the proposed prediction method is illustrated by worked examples that reveal a good agreement with results obtained from finite element analyses and experiments. The proposed modifications would be significant, especially with long-span floors where vibration levels may be underestimated by the current design procedure. The accuracy of the proposed formulas and other proposals found in the literature is examined. Design charts and approximate closed form formulas to estimate the walking response are developed in which various factors relating to the dynamic characteristics of both the floor and the excitation are considered. This paper highlights some limitations of one of the most commonly used guidelines AISC/CISC DG11, and proposes improvements to this method.
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Annoying vibrations due to normal walking activity have been observed more frequently on long-span lightweight floor systems in office and commercial retail buildings, raising the need for the development of floor vibration design procedures. Multiple levels of increasing difficulty with their own storiesģ.Serviceability rather than strength is the most critical design requirement for vibration-vulnerable floor constructions. Tap the screen to make a sharp turn, avoiding obstacles and reacting to the World changing before your eyes.Ģ. Guide an ever-growing Line through a multiple of environments, listening carefully to the music. Listen to the beat and the melody, and after a short while you will find yourself doing better and better.Ĭome on! Test your reflexes and rhythm skills! See the surprises and wonders every level holds for you. The key is to not only watch for obstacles and traps, but also play to the music.
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