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中文摘要：
针对新型UHPC连续箱梁桥的结构特点及预应力体系布置,对其腹板处体外预应力下折索进行齿块锚固研究.对独立矩形齿块进行应力分析,揭示板厚对锚固区壁板外侧＂局部弯曲效应＂的影响.通过拓扑优化分析构建出一个揭示齿块锚固区传力机理的简化平面杆系模型,提出两种齿块锚固区局部加强的方法.在此基础上,对UHPC箱梁桥的腹板体外预应力锚固齿块进行构造设计,对比6种不同锚固方案,分析横隔板、预应力筋齿块内转向和锚固长度对锚固区受力的影响,最终得出较为合理的体外预应力齿块锚固构造形式.
英文摘要：
According to the characteristics of a novel continuous UHPC box-girder bridge and the layout of its prestressing system, the anchor block for external tendons on the web was studied. Firstly, the effect of the plate thickness on the ＂local bending effect＂ in anchorage zone was evaluated through the anal- ysis of stress in the isolated rectangular anchor block. A simplified plane linkage model was proposed through the topology optimization in order to study the force transfer mechanism in anchorage zone. Moreover, two kinds of methods were developed to strengthen the anchorage zone based on the simplified mod- el. On the basis of the above research procedure, six different anchoring schemes of the anchor block for the external tendons were designed. After analyzing and comparing the performance of the different ancho- ring schemes, the effects of diaphragms, steering of prestressing tendons, and anchoring length of the anchor block on the mechanical behavior of the anchorage zone were evaluated. Finally, a type of reasonable anchor block of the external tendons was obtained.
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