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以大跨径预应力混凝土梁桥存在开裂、下挠过大等病害为对象,研究病害的主要成因和对策,试图探讨解决这些问题的设计新思路,即引入斜拉桥施工监控原理,对影响其应力、位移的主要因素,即自重、预应力摩阻损失、混凝土收缩徐变等进行施工和使用阶段的监控,并根据参数识别在施工阶段对预应力束进行股数调整,在使用阶段利用体内和体外备用束视监控情况进行内力调整,从而提高梁体的抗裂性能,达到有效预防混凝土梁桥常见的梁体开裂、跨中下挠过大等病害,文中对珠江大桥的设计做了简单介绍。
The major causes and countermeasures of the disease are studied in order to find out the existing problems such as cracking, under-deflection and so on in large-span prestressed concrete girder bridge. The author tries to find out a new design idea to solve these problems, that is, introducing the principle of construction monitoring and control of cable- The main factors of its stress and displacement are self-weight, friction loss of prestress, shrinkage and creep of concrete, etc. The monitoring of construction and use phases is carried out. According to the parameter identification, the stock number of prestressing strands is adjusted during the construction phase, The internal and external standby beam depending on the monitoring of internal forces to adjust the situation to improve the crack resistance of the beam body to achieve effective prevention of concrete beam bridge common beam cracking, mid-span deflection and other diseases, the design of the Pearl River Bridge done a brief introdction.