Decisions for admission consider the following:

GPA The GPA is based on upper division undergraduate courses and all graduate work.  In 2006, the average GPA for successful applicants for admission was 3.82 (Median 3.87).
Class Standing Applicant’s rank in class is an important indicator.  In 2006, most successful applicants ranked in the highest 5% of their class and many were in the top 1%.
GRE Applicants must take the aptitude test of the Graduate Record Examination.  In 2006, successful applicants for admission typically had a quantitative score of at least 700 (average was 766), an analytical score of at least 600 (average was 639 or 4.5 - 5.0 on the written version), and a verbal score above 400 (average was 514).  The average quantitative, analytical and verbal scores of applicants that were extended financial aid offers are 734, 664, and 523 respectively.
TOEFL The test of English as a Foreign Language (TOEFL) is required of all applicants whose native language is not English.  Successful applicants typically have at least 250 on the computer based test (equivalent to 600 on the older paper-based test); higher scores increase the chances of admission.  The average in 2006 was 253 (606).
References Three letters of recommendation from people familiar with the applicant’s abilities are required.  At least two of these letters should be from academics that have personal knowledge of the applicant’s performance in structural engineering classes or research.
Personal Statement Very careful attention is given to the statement describing the applicant’s activities, accomplishments, goals and research interests (to the extent known).
Work Experience Considerable attention is given to actual structural engineering experience.  For those with work experience beyond graduation (or relevant summer or co-op experience), a summary of the applicants employment record is desired.