Question:
How do I apply the ASCE 7 Orthogonal Directional Combination procedure (100% + 30% rule) to my seismic load in a static analysis?
Answer:
1) The default orthogonal combination factor is set to 0.3 (30%). This value can be changed by going to Edit Parameters of Edition in the Load Cases & Combinations (Image 1)
► Image | Orthogonal Combination Factor https://www.dlubal.com/en/img/033526
2) Under the Load Cases tab, create the seismic load cases in the X and Y directions with Qe as the Action Category. Activate the 'Additional Settings | Consider X and Y independently' option. Then, specify the direction under the Additional Settings tab (Image 2)
► Image | Seismic Load Cases https://www.dlubal.com/en/img/033527
3) Under the Design Situations tab, select the Edit Combination Wizard button. In the Standard Options tab, make sure that the Include orthogonal combinations option is activated (Image 3)
► Image | Include Orthogonal Combinations Option https://www.dlubal.com/en/img/033528
4) The generated COs including the orthogonal combination factor are listed in the Load Combinations tab (Image 4)
► Image | Generated COs with Orthogonal Combination Factor https://www.dlubal.com/en/img/033529