A study to reduce heavy-weight floor impact noise in apartment building using stiffness reinforcement method on concrete slab

摘要

The floor impact noise radiated from upstairs has been great annoyance among occupants in Korean apartments. Since Korea government made the law of floor impact noise limits, a lot of studies have been carried out to develop applicable floor structures that can reduce heavy-weight floor impact noise effectively. The purpose of this study is to show possibility that can reduce heavy-weight floor impact noise radiated from shallow concrete slab of 135mm thickness increasing dynamic stiffness of slab. In this study, numerical analysis was carried out to predict change of dynamic characteristics of concrete slab by stiffness reinforcement methods, and a method using H-beam was selected for an experiment. Modal test was performed to measure dynamic characteristics of slab and to verity change of it after stiffness reinforcement. It was clear that dynamic stiffness as well as natural frequency increases by stiffness reinforcement of slab. Heavy-weight floor impact noise was measured in a receiver room below concrete slab of 135mm thickness and it was found that has a strong relation with vibration mode of slab. It was measured that heavy-weight floor impact noise decreases 2dB after stiffness reinforcement of slab.