We are designing an antenna mount onto a penthouse which has a brick facade and a concrete wall. for embedment since the facade is non structural we should assume all effective embedment is in the concrete and design the threaded rod total length includes whatever width the facade is and the min embedment, correct? I have included a typical wallmount connection.
Hi Marc,
For similar applications, engineers typically design and specify the effective embedment depth for the concrete base material. Then the threaded rod would need a sufficient length to achieve the specified concrete embedment, façade thickness, and fixture thickness, with space available for the nut and washer. This previous Ask Hilti response further clarifies that Hilti’s anchor testing was conducted in monolithic slabs and therefore, in this case, the anchor's technical data would be dependent on the concrete base material.
Please note that stand-off conditions may be relevant to your design and thus bolt bending and steel lever arm failure may need to be considered. Information about bolt bending can be found in this Ask Hilti response. Ultimately, all design decisions are at the discretion of the Engineer of Record.
Best,
Sam