Investigations on Integrally Lifted Prefabricated High-Performance Concrete Cap Beams

Abstract

This research proposes two new types of prefabricated high-performance concrete cap beam structures, which solve the problem that the traditional large cap beam needs to be split into two to three parts during assembly construction, and the construction efficiency is reduced. Using new materials such as ultra-high performance concrete (UHPC) and new technology such as high-performance composite structure, two new types of cap beams are studied. Taking prestressed concrete cap beams as the control group, the calculation model of each cap beam is established, and then the mechanical performance of each cap beam is tested and analyzed. At the same time, the self-weight, cross-sectional size, quantity of prestressed steel bars, and manufacturing material cost of each cap beam are also analyzed and compared, and the applicability of each cap beam is given. The research results show that compared with ordinary concrete, the use of UHPC can significantly improve the mechanical performance of the cap beam, reduce the cross-sectional size of the cap beam, and reduce the self-weight of the cap beam. Calculation results show that the steel-UHPC composite cap beam can achieve the smallest lifting weight. In summary, the two new prefabricated high-performance concrete cap beams proposed in this paper can significantly reduce the self-weight of the cap beam and improve the construction efficiency.