Effects of Shoring Composite U-Beam Members. Study Number 71-3.

摘要

An analytical study of a bridge superstructure composed of prestressed-precast composite u-beam members with temporary mid-span shores is presented in the report. The composite u-beam bridge superstructure has indicated economy of construction in previous reports. However,in many cases deflection rather than strength limitations control the design of u-beam members. The control of design by deflection limits is to assure serviceability of the structure. The report considers analytical prediction of a point shored u-beam superstructure with respect to the internal stresses and stress distribution of mid-span under the shore;the creep and shrinkage restraint moments,as well as the restraint moments due to the shore,over the interior piers;and the ultimate mid-span deflection. (Modified author abstract)