Personally, I pick and choose. Books, in general, tend to have a longer lag from "new" to publication. Moreover, most books generally do not have the detail that might be found in a particular article. You can see this in books that are detailed with respect to their citations. So, they typically summarize the findings of a particular article with a couple of graphs, figures, or tables, and some paragraphs, while the article cited might have had 15 pages of text. Typically, some specific subject is usually attached to article citations, so finding the article shortcuts digging through a bunch of books, doing interminable word searches, and then finding out that the books only covered the subject superficially.
I've never tried to look for structural engineering related articles in Google Scholar, but I'd imagine it's similar to what I might find for, say, compressive sensing, which had about 200k hits in Google Scholar, but admittedly, most of the hits will probably require paying, or are not quite related to the specific thing I'm looking for.
Finally, books are rarely available for free, but there are plenty of articles available through Google Scholar, or through individual authors' personal websites. I've got a membership with IEEE, though, which covers thousands of articles and gets me some level of access to articles that require payment.
I do, however, have quite a few textbooks, some of which are holdovers from when I owned a big chunk of physical books, but I now tend to look for electronic books, if for nothing else, a quantum reduction in volume consumed. Costco sells a 2 TB notebook portable drive, which can hold millions of books, if need be.
There's some sort of "comfort food" feel to have physical books, though, the smell, the feel, etc. But, that's just probably because I grew up with physical books.
TTFN
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