Appraisement Of The Vibration Serviceability For A Long-Span Prestressed Reinforced Concrete Floor Under Random Loads

As the building technology develops, long-span pre-stressed reinforced concrete floors are wildly used in transportation centers, the natural frequency is reduced, larger reactions are caused under random loads and users will be disturbed. The appraisement of the vibration serviceability in the design stage is necessary. The vibration serviceability is systematically analyzed in this paper using the finite element analysis software AN SYS.(1) Evaluation standards of different times are collected all over the world. A kind of evaluation method based on psychology named as the Annoyance Rate is also collected. Frequency weighted root mean square acceleration (R.M.S) and fourth power Vibration Dose Value (VDV) are selected as evaluation indicators after comparison. Annoyance Rate curves in different environments is drawn and is used as another evaluation indicator for the appraisement of the vibration serviceability.(2) Using the finite element analysis software ANSYS, the appraisement of the vibration serviceability of the parking station on second floor is entirely evaluated using modal analysis method and time history analysis method.Firstly Frequency weighted root mean square acceleration (R.M.S) and fourth power Vibration Dose Value (VDV) are used to evaluate the vibration serviceability in the research under random vehicle loads and random The pedestrian loads, then the Annoyance Rate are also used in the research under random vehicle loads,the difference is compared.(3) A reasonable simplified structure is taken for the research of the long-span pre-stressed reinforced concrete floor using the Annoyance Rate as the evaluation indicator. The influence to the vibration serviceability of the pre-stressing force is analyzed using equivalent load---entity and reinforcing bar method. The similarities and difference between traditional appraisement methods and the Annoyance Rate are concluded.