CAJ | 학술논문

为提高钢锚箱型组合索塔锚固区传力可靠性，提出了一种将钢锚箱端部嵌固在索塔锚固区的新型结构；基于混合有限元模型，比较分析了该新型结构与现有内置型、外露型钢锚箱索塔锚固区的钢锚箱钢材利用率、塔壁混凝土应力以及钢－混凝土结合面受力机理；进一步探讨了嵌固端侧板厚度、连接件布置方式对钢锚箱嵌固型索塔锚固区受力机理的影响。结果表明：钢锚箱嵌固型索塔锚固结构具有较高的钢材利用率；端塔壁外侧混凝土主拉应力较内置型降低约1．5 M Pa且外包钢板；钢锚箱与混凝土塔壁结合面连接件作用单方向均匀剪力；侧板厚度、连接件布置方式对连接件剪力影响较大；该新型构造传力可靠性高，可用于更大跨径斜拉桥拉索塔端锚固结构。
위제고강묘상형조합색탑묘고구전력가고성，제출료일충장강묘상단부감고재색탑묘고구적신형결구；기우혼합유한원모형，비교분석료해신형결구여현유내치형、외로형강묘상색탑묘고구적강묘상강재이용솔、탑벽혼응토응력이급강－혼응토결합면수력궤리；진일보탐토료감고단측판후도、련접건포치방식대강묘상감고형색탑묘고구수력궤리적영향。결과표명：강묘상감고형색탑묘고결구구유교고적강재이용솔；단탑벽외측혼응토주랍응력교내치형강저약1．5 M Pa차외포강판；강묘상여혼응토탑벽결합면련접건작용단방향균균전력；측판후도、련접건포치방식대련접건전력영향교대；해신형구조전력가고성고，가용우경대과경사랍교랍색탑단묘고결구。
To enhance the force transfer reliability of the composite pylon anchorage zone of steel anchor box type ,a new type of the structure of the pylon anchorage zone in w hich both ends of the steel anchor box were fixed was proposed .Based on the mixed finite element models ,the steel utilization rates of the steel anchor boxes for the proposed new structure and for the existing pylon anchorage zones of built‐in and exposed steel anchor box types ,the pylon wall concrete stress and the force conditions of the steel and concrete joints were compared and analyzed .The influences of the lateral plate thickness of the fixed ends and arrangement of the perfobond con‐nectors on the force mechanism of the pylon anchorage zone of the proposed fixed‐end steel anchor box type were further investigated .The results of the analysis demonstrate that the pylon an‐chorage structure of the fixed‐end steel anchor box type has high steel utilization rate .The end pylon wall is wrapped with steel plate and the principal tensile stress of the concrete at outside of the pylon wall decreases 1 .5MPa as compared to that of the anchorage zone of built‐in steel an‐chor box type .The shear force action of the connectors at the joint of the fixed‐end steel anchor box and pylon wall concrete is almost uni‐directional and uniform .The lateral plate thickness and arrangement of the connectors have great influences on the shear forces of the connectors .The proposed new structure has high reliability of force transfer and is applicable to the pylon end an‐chorage structures of cable‐stayed bridges with still longer spans .