Combining Magical Effects on page 205 of the Player’s Handbook says:
The effects of different spells add together while the durations of those spells overlap. The effects of the same spell cast multiple times don’t combine, however. Instead, the most potent effect—such as the highest bonus—from those castings applies while their durations overlap.
Are there any spells or magical abilities that allow multiple instances to target or affect a single creature simultaneously?
An example of such an effect is this or this.