超高性能混凝土节段拼装混凝土护栏受力性能分析

面对装配化桥梁的高速发展及服役桥梁混凝土护栏改造的装配化需求,提出由超高性能混凝土(ultra-high perform-ance concrete,UHPC)装配连接的新型节段拼装混凝土护栏.通过数值模拟对比分析了准静态荷载和冲击荷载作用下新型节段拼装混凝土护栏和普通混凝土护栏的极限荷载、动力响应和破坏形式.结果 表明:新型节段拼装混凝土护栏在各类加载条件下均具有普通混凝土护栏同等的防撞性能;UHPC构件能替翼缘板吸收大量冲击能量,可有效减小翼缘板受力,起到一定的保护作用.所提混凝土护栏节段拼装方案为混凝土护栏的装配化施工提供参考.

Mechanical Performance Analysis of UHPC Segmental Assembled Concrete Barrier

In the face of the rapid development of prefabricated bridges and the assembly requirements for the reconstruction of concrete barriers of service bridges, this paper proposes a new segmental assembled concrete barrier which is assembled and connected by ultra-high performance concrete (UHPC). Through numerical simulation, the ultimate load, dynamic response and failure mode of new segment assembled concrete barrier and ordinary concrete barrier under quasi-static load and impact load are compared and analyzed. The results show that: the new segment assembled concrete barrier has the same anti-collision performance as ordinary concrete barrier under various loading conditions; UHPC members can absorb a lot of impact energy for the flange plate, which can effectively reduce the flange plate stress and play a certain protective role. This paper provides a reference for the assembly construction of concrete barrier.