Oral Presentation

¹Mohamed Nasr Elansary ; ²Mohamed Abdelshakor Hasan; ³Eehab Ahmed Khalil

¹Construction and Building Department, faculty of engineering and technology, Arab Academy for science, Technology, and Maritime Transport., Aswan, Egypt

²College of Engineering and Technology, Arab Academy for Science, Technology, and Maritime Transport

³Construction research institute, National water research center

Studies on cable-stayed bridges subjected to blast loads faces challenges due to the interaction between different elements. While there has been extensive research on how buildings respond to explosive loads, limited literature is available that covers the dynamic response of prestressed concrete bridge deck exposed to blast loads. Single plane cable stayed bridges are very sensitive to cable loss or degradation. In this study, the behavior of prestressed concrete cable stayed bridge with single plane is investigated under blast loads. A comprehensive finite element model was implemented considering nonlinearity effects. The study considered three different blast weights 230 kg, 680 kg, and 2270 kg of TNT. The analysis revealed that the deck incurred damage in small explosions with more significant effects under higher blast loads, causing a damaged region of 12 m x 10 m with a 2270 kg TNT weight. Forces in cables near the detonation point have increased by 19% at 2270 kg TNT explosion. Pylon moments indicate a notable change under different explosion charges. The maximum bending moments values was noticed at the base under dead and live loads. While under various explosive weights, bending moments at mid-height have increased with a significant decrease at the base. The study is a valuable resource for designers, highlighting the significance of integrating explosion-resistant design principles of cable-stayed bridges.

Cable-stayed bridge; Structural Response; Prestressed Concrete; Blast loads

Structural and Construction Engineering