Hi fjs2802,
You must never allow a wind chime to be on top of your head as this will bring sha qi to you. Placing wind chime below a long beam is not a solution to counter the sha qi. You must understand why there is sha qi coming down from the beam. When qi travel upward and meet a beam it will slip off directly down and this will create a sha qi to any person sitting below. But you must sit for a long period or at least more than few hours before you really can be affected by the sha qi.
Best solution to counter the sha qi is to place a lighted table lamp below the beam. In this way the heat from the lamp will be able to hold the sha qi. Another method is to place some cloth material like a wave at both side of the beam. In this way the qi will be well spread out when it reach the beam. But such method may have some décor and maintenance problem.
Bernard