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本文介绍了混凝土拱桥的组合式桥台的主要形式及其适用范围,扼要地阐述了这类桥台的构造特征、设计要点,并对影响变形的因素进行了探索与分析,对于台后路基高填土引起的桥台变形,从设计与施工角度提出了降低这种变形对上部结构影响的措施;对于台身及阻滑板在水平推力作用下的工作状况,还提出了不同于现行公路桥涵设计规范对拱桥组合式桥台所作的计算规定,从变形协调的观点推导出验算桥台的变形与强度的基本公式。这些成果已应用于多座混凝土拱桥的设计中,证明以上观点基本符合实际;同时,将有关设计原则已纳入公路桥涵设计规范修订草案中。
This paper introduces the main form of the composite abutment of concrete arch bridge and its applicable scope, briefly describes the structural features and design points of such abutments, and explores and analyzes the factors that affect the deformation. The deformation of the bridge abutment caused by filling is put forward, and the measures to reduce the influence of this deformation on the superstructure are put forward from the perspective of design and construction. For the work condition of the abutment and the skid plate under the horizontal thrust force, Regulate the calculation rules for the combined abutment of the arch bridge and derive the basic formula of the deformation and strength of the abutment bridge from the perspective of deformation coordination. These results have been applied to the design of a number of concrete arch bridge to prove that the above point of view is basically in line with the actual; the same time, the design principles have been incorporated into the revised draft of highway bridges and culvert design specifications.