APPLICATION OF RANDOM WALKING FORCE IN FLOOR VIBRATION SERVICEABILITY ASSESSMENT

In order to overcome the problem induced by different exceeding probability of dynamic load factors in CCIP 016 and SCI P354, vibration serviceability assessment method for floor structures based on random walking force and annoyance rate is proposed. Randomness of the parameters in walking force is taken into account to construct random walking force time histories, and then cumulative probability of the maximum RMS (Root Mean Square) acceleration responses of the structure is found through a large number of time history analyses, distribution parameters is determined hereafter. Combined with the distribution parameters of annoyance rate, the reliability index of the floor vibration serviceability can be calculated. Vibration serviceability of the structure is assessed by expectation of annoyance rate calculated from reliability index. The proposed method is built on the basis of probability, and has no relationship with the exceeding probability of dynamic load factors, so it is more convincing than the methods at present. Numerical results of an actual structure show that the maximum RMS accelerations acquired by CCIP 016 and SCI P354 have a small occurrence probability, so it is not suitable to use as the representative value of human induced vibration.