| Title |
A Comparative Study on the Dynamic Characteristic for Vertical Vibration on the Building Structures due to Train Loads |
| Keywords |
Traffic Load ; Soil-Structure Interaction ; Vibration Transfer ; Vertical Vibration ; Vibration Level ; Amplification Factor |
| Abstract |
This study measures the vibration of the ground, first floor, second floor by experiments. It analyzes the data into time history, frequency and 1/3 octave band, and, then, studies the change of the vertical vibration response that the traffic load is transmitted into the buildings through the ground. The object of this study is to analyze the effect of vibration level about amplification factor and types of train and to understand the vertical vibration properties that the vibration is transmitted into buildings from the traffic load.
The result of this study, the vibration transmitted into buildings when a train is traveling is found to move to low frequency and be narrow and regular for the range of predominant frequency due to the resonance on natural frequency of the building. But the peak value is occurred in various frequency at the first-floor because the vibration of the ground is transmitted much more into the first-floor than the second-floor. The vibration level and the vibration amplification factors on each floor vary due to the difference of the ratio of the stiffness of column to the stiffness of beam on lower and upper floors. They tend to decrease when the ratios have no difference, yet, increase when the ratio on the upper floor is smaller than the lower floor, as the vibration is transmitted to the upper floors. The ground vibration levels caused by traveling trains are measured highest in the order of Saemaul line, Tongil line, Mookoongwha line and freight train. The differences among types, however, have the value of 0.5dB or less, which the effect of train types can be ignored except freight train. This can be understood that the speed and load of trains are the major factors on the ground vibration level. |