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In most cases, the force in the collector is not enough to enforce enlarged-section in the form of a beam. The reinforcement can be provided within the slab. There is no other way, One has to complete the load path.

Welcome to the forums. Here are the answers: 1) To satisfy code requirement that dynamic analysis base shear can't be less than 85% of static analysis base shear. 2) Static load combinations for static loads like dead, wind, live and snow and dynamic load combos for earthquake. 3 and 4) Please see the following articles on this forum: 5 and 6) Please see the following articles on this forum: 7) Please see the following topic: 8) Because it would result in huge over-design. Its counter intuitive and defies statistical philosophy behind load combinations. 9) Inertia causes forces and mode shapes. 10) The difference is hard to summarize in a short answer. You can post a new topic and we can discuss it there. Time history is more accurate. 11) Effect is in the form of deformation. Slabs are considered rigid in plane and may deform in their plane. You need to design them such that they can transfer lateral loads to lateral load resisting system. Beams deform and bend under seismic loading. 12) Right. 13) Please see this article: 14) Don't put. 15) Energy dissipation, cracking, elasticity 16) Please see answers to 3) and 4) above. Hope that helps. Cheers!