ASCE SLS combination for seismic ASCE SLS combination for seismic Sevil22 (Structural) (OP) 21 Aug 17 13:09 Hello dear engineer. I want to know, which load combination i need for use when I check serviceability limit state using seismic load. RE: ASCE SLS combination for seismic KootK (Structural) 21 Aug 17 17:13 For conventional, code based seismic design in the US, I don't believe that there are serviceability drift checks. You simply have to adhere to the rather liberal (~h/40) drift limits specified in ASCE 7 for strength level design. Different drift limits apply if you're doing extra-code design such as performance based design but that, then, is another kettle of fish and much is left to the discretion of the design team. I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it. RE: ASCE SLS combination for seismic DETstru (Structural) 25 Aug 17 18:07 To add to KootK's comment, Design based on ASCE 7-10 in the US gives you some "help" by removing the CuTa cap on your building period. So in a way, it is a sort of "serviceability" check (though not labeled as such). You check the non-period-capped drift against Table 12.12-1 and the exceptions/notes in Section 12.12.