hi,

The eligibility criteria for phd course in IIIT hyderabad for structural engineering is as follows:

Candidates must complete First class Bachelor’s degree (B.Tech / B.E) in Civil / Aerospace / Mechanical Engineering from a recognized University AND First class Master’s degree in Structural (or, allied) Engineering from a recognized University.

however I would suggest to follow  gate syllabus of civil engineering along with your m.tech course syllabus. there is no specific syllabus is given in website, however IITs written or viva test basic conception questions and project works are basically asked.

to know in details follow the below link:

https://www.iith.ac.in/phdadmissions/2021_July_brochure/CE_PhD_July2021_Brochure.pdf