Research on Cable Anchorage Systems for Self-Anchored Suspension Bridges with Steel Box Girders
Research on Cable Anchorage Systems for Self-Anchored Suspension Bridges with Steel Box Girders
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DOI：
10.1061/(asce)be.1943-5592.0000190
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发表时间：
2011-09
影响因子：
3.6
通讯作者：
J. Nie;M. Tao;Jian-Sheng Fan
中科院分区：
文献类型：
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作者：
J. Nie;M. Tao;Jian-Sheng Fan
为优化钢箱梁自锚式悬索桥的受力性能，提出了一种新型的钢-混凝土组合锚索体系，并对其进行了初步研究。以在建的中国青岛海湾大桥为工程背景，对纯钢和钢-混凝土组合锚索锚固体系进行了模型试验和三维精细有限元分析。对于纯钢锚固系统，试验中观察到了复杂的应力分布和明显的应力集中。应力分布的有限元分析结果与实验测量结果吻合较好。青岛海湾大桥工程最终设计采用的纯钢锚固系统可靠，有足够的安全裕度。在组合锚固体系的对比试验中，由于钢与混凝土之间的复合作用，与纯钢锚固体系相比，应力水平显著降低，应力分布更加均匀。试验测得复合锚杆的应力降低率平均约为40%，略小于有限元计算结果，反映了钢与混凝土之间的局部复合效应。提出的组合锚固系统可以有效地减小钢板的厚度和消耗，改善锚固系统的受力性能，简化制造和施工程序。
A new type of steel-concrete composite cable anchorage system is conceived and investigated preliminarily for self-anchored suspension bridges with steel box girders to optimize the mechanical behavior of the conventional cable anchorage systems. Model tests and 3D elaborate finite-element analysis (FEA) of the pure steel and steel-concrete composite cable anchorage systems are carried out for the Qingdao Bay Bridge Project, which is under construction in China. For the pure steel anchorage system, a complex stress distribution with obvious stress concentration is observed in the test. The FEA results of the stress distribution correlate well with the experimental measurements. The pure steel anchorage system adopted in the final design of the Qingdao Bay Bridge Project is reliable with a sufficient safety margin. In the contrast test of the composite anchorage system, owing to the composite effect between the steel and concrete, the stress level is reduced significantly and the stress distribution becomes more uniform in comparison with the pure steel anchorage system. The measured stress reduction rate of the composite anchorage averages approximately 40%, which is slightly smaller than the FEA results, and indicates the partial composite effect between the steel and concrete. The proposed composite anchorage system can effectively reduce the thickness and consumption of the steel plates, improve the mechanical behavior of the anchorage system, and simplify the fabrication and construction procedures.