Foundation micro-vibration design load determination method

The invention discloses a foundation micro-vibration design load determination method, which comprises the following steps: carrying out uninterrupted vibration tests on a plurality of positions of a foundation at a specific depth, and obtaining micro-vibration time domain signals of each test point; formulating reasonable criteria and algorithms, and removing abnormal interference pulses in the time domain vibration signals effectively; removing null drift of the data after abnormal interference elimination, performing power spectral density analysis, and obtaining a power spectral density envelope of the test data; improving the load magnitude according to a certain rule on the basis of the power spectrum density envelope obtained through calculation, and obtaining the foundation micro-vibration design load. The foundation micro-vibration load determination method is provided for a building structure of a precise instrument device, and more real and reasonable load input is provided for site selection, vibr