Seismic Performance of the High-Pier Long-Span Continuous Rigid Frame Bridges Composed of the Ultra-High Performance Concrete

摘要

Structural overweight is a significant defect to limit the development of the traditional long spanrnrigid frame bridges. Thus, an alternative ultra-high performance concrete (UHPC), named asrnreactive power concrete (RPC), has been proposed to improve this problem. The previousrnresearches mainly focused on the material experiment of RPC component and some meaningfulrnconclusions were obtained from the experiment. However, on the one hand, the weight loses of thernRPC superstructure can apparently increase the span of the bridge and decrease the seismic force ofrnthe high-pier; on the other hand, the high performance of the RPC can strengthen the seismicrncapacity of the RPC piers to promote the seismic behavior of the whole bridge. Therefore, in thisrnstudy, three contrastive schemes are designed to compare with the original design scheme which isrna typical high-pier long-span (HPLS) continuous rigid frame bridge composed of normal concretern(NC). In addition, a simple economic analysis is conducted to select the optimum scheme. It isrnconcluded that it is more efficient and effective to choose the UHPC as the main material for thernHPLS bridges. Even though the UHPC can be applied to all components of the bridge whichrnperforms the best seismic behavior, it is more economic and appropriate for using UHPC only onrnthe superstructure.