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Dear Umar! You and your team of moderators are doing an outstanding job, in running this forum. It is very nice to see this forum improving day by day, through the addition of new features & attractions like member rankings etc, and now this roles of honour. Although in my personal opinion, I haven't done anything special, other than to advise the forum members sincerely in the matters I could help in some way. Moreover, I do not do this for my name, but solely because IMO helping others, within my capacity & capabilities, is my moral & national duty. Neverthless, I am grateful to you (as well as to the others who think alike) & really feel proud on being designated as SEFP VIP. Regards.

Good question. Seismic forces are actually inertial forces generated within a body in response to seismic acceleration at ground. When seismic ground waves (PGA) accelerate a building (Sa; spectral acceleration), the inertia of a building resist these accelerations generating inertial forces in the building. Inertial forces are nothing strange but the usual F=ma i.e. the product of mass and acceleration. In softwares, the joints or nodes are loaded with this F based on the mass attributed to the tributary area of that particular node x accelration of that floor. Like this, these forces are applied at each level like static procedures.

Dear All, I have just finished modifying a bunch of stuff related to member roles and I am very excited to announce it. There are some new member roles that have been created: 1) SEFP Associate As you know that I have been requesting help with a number of stuff on SEFP and there are very generous people who have volunteered. To recognize their effort, I have created this role. An example is @Saad Pervez, who is doing an excellent job running our Social Media pages. From now onwards, you will find him assigned to SEFP Associates. Thanks Saad for your help. 2) SEFP Contributor There are a few members who have been with us through thick and thin. Because, they have regularly answered questions and contributed to forum by not only providing information but their engineering judgement, this role has been created in recognition of their efforts. @Ayesha has been assigned to this and we look forward to add more members to their club. 3) SEFP VIP @EngrUzair deserves this without any question. He is the most senior member of the forum providing invaluable support. Not only this but he has also been a teacher at our beloved Alma Mater. I have created this category in recognition to his efforts. We "might" be adding very few people to this role in upcoming years. 4) Moderators and Super Moderators Our current staff consists of @waqar saleem, @Rana and @BAZ. @Rana and @BAZ have global moderation over the forum and @waqar saleem is currently moderating all the technical sections. They all are doing a great job and I am very thankful them. Because of overall moderation assignment, I have split moderators in Super Moderator and Moderators. Supermods might also get portion of Admin rights over coming years. I have a plan for that but nothing set in stone. Like always, please provide your feedback and let me know what else should be done/ undone. Thanks.

To start with, search "Vierendeel girder analysis and design" on Google. In the displayed results, look for book names or pdf files. In this way, you might be able to select some relevant resources on your topic & in certain cases, download them as well. Regards.