Aiming at realistic conclusions, three case-study real-world segmental balanced cantilever bridges over the Nile River in Egypt are elected. The research primary objective is to assess the validity/reliability of commonly used ad-hoc approaches that evolved over the years relying on simplified analyses/formulae to cater for time-dependent creep effects for this type of bridges. The second approach is through performing real sophisticated step-by-step time-dependent analysis using a specialized software.

Time-dependent moments retrieved from these classical methods always reside in an intermediate state falling between the results from “two” time- independent analysis cases, namely, (a) sequentially adding all partial permanent loads and prestressing pertaining to various construction steps using the part-bridge structural system corresponding to each step, and (b) assuming all loads and prestressing forces to be applied at-once to the final completed bridge. The first is a family of varied simplified methods typically known to practicing designers and with pre-consensus on their reliability and effectiveness. In essence, despite some apparent diversity, there are basically two key conventional approaches to compute the design time-dependent moment accounting for creep effects for this type of bridges.

Kindly let us know if further assistance is required.Assessing available numerical techniques adopted to determine the design time-dependent moment for prestressed concrete segmental bridges constructed by the balanced cantilever method is of utmost importance to the bridge design community. Since tendon primary forces itself are not affected, tendon secondary forces also won't be affected. Now, tendon primary is the force being applied to the structure due to prestress and Tendon secondary is nothing but the the resistance in the indeterminate structure due to the applied prestress load. The forces would remain unchanged, no matter the transfer length.

This can be verified by checking the beam forces result. It does not affect the axial force of the tendon and the force being transferred to the girder element. What this feature basically does is just the way how stress is considered at the extreme fibres. The purpose of transfer length is as shown in the image below. Thank you for writing to us! Glad to know that you are keenly studying the features in the software. I am using PC tendon Construction Stage analysis I have a question regarding ＴＲＡＳＦＥＲ LENGTH OPTION, Tendon Primary load case stress result table has effect of transfer length as input.īut please explain Why? Tendon Secondary load case stress result table has no effect of transfer length. I am MIDAS CIVIL beginner, I would appreciate if you could help me understand the ＴＲＡＳＦＥＲ LENGTH option

Tendon primary midas civil