As the author of your thesis or dissertation, you own the copyright to your work. While copyright law does not require including a copyright statement, it's a good idea to explicitly state ownership in your document. Include the word copyright (or symbol), the date, and your name.
Virginia Tech Policy 13000 addresses the rights of authors and the university with regard to intellectual property. For "the traditional results of academic scholarship, i.e., textbooks, literary works, artistic creations and artifacts," the IP rights belong to the author, unless the university commissions the work. The university, however, retains the right "to free (no cost) use in teaching, research, extension, etc., in perpetuity."