In recent years, hybrid tower structures have become increasingly established for wind turbines with large hub heights. The concrete part of such towers is composed of precast segments stacked on top of each other. The joints between the several segment levels are typically designed as dry ground joints. This paper presents experimental investigations on the load-bearing capacity of dry joints under combined loading of prestressing, bending and torsion. The tests were conducted on a model tower consisting of three circular ring segments. The joint load-bearing capacity was determined by monitoring the tangential displacements. It was found that the joint load-bearing capacity decreases uniformly with increasing bending load. Based on the test results, a numerical model for calculating the load-bearing capacity of dry concrete joints was developed and validated. The comparison of the experimental investigations and numerical simulations shows very good agreement.