区别于预应力锚固系统，在传统钢框架后锚梁锚固系统的基础上，南京长江第四大桥采用一种新型悬索桥主缆锚固系统——分布传力式锚固系统。钢框架后锚梁锚固系统依靠后锚梁刚性承载，应力集中明显，有一定的结构和安全风险。分布传力式锚固系统锚固区域通过布置多排钢筋混凝土榫剪力键（PBL），变刚性承压承载为柔性承载，索力渐次传递至锚体混凝土；变集中承载为分布传力式承载，扩大了传力区域，减小应力集中，降低结构风险；利用PBL良好的延性，同时通过设置末端承压板，为结构整体提供足够的安全储备。本文对这种新型锚固系统的设计作了简要介绍。

Superior to conventional pre-stressed anchorage system, a new anchorage system design concept of cable-stayed bridge, the stress distributed transmitting anchorage system, is adopted to the Fourth Nanjing Yangtze River Bridge referencing to the design of conventional steel framed anchorage system. The conventional steel framed system relies on the back anchorage beam, which provides rigid bearing supports and results in large concentrated stress, and has certain risks on both structural and safety aspects. However, the stress distributed transmitting anchorage system is arranged with several rows of reinforced concrete tenon-joint shear connector (PBL) in anchoring area in order to transform the rigid bearing supports to flexible bearing supports which helps cable stress gradually delivering to concrete anchorage block, changes the pattern of stress distribution from concentrated to distributed, enlarges the stress region, decreases the degree of stress concentration, minimizes the structural risks, and provides plenty of emergency capacity by taking advantage of the ductility of PBL and allocating end bearing plates. The design concept of the new anchor system is briefly introduced in this paper.

崔 冰（1966—），男，河北枣强市人，教授级高级工程师，研究方向为桥梁设计