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中文摘要：
以一座独塔混凝土梁混凝土塔斜拉桥为工程背景，对按规范验算主塔承载能力极限状态进行了分析研究，对偏压构件（桥塔）的关键参数计算长度l0的准确取值提出建议，弥补了规范中无法考虑斜拉索非保向力效应的不足。与精细有限元模型计算结果的对比表明，采用该参数取值原则与改进方法计算斜拉桥主塔极限承载能力是可行的。
英文摘要：
Against the background of a concrete girder cable-stayed bridge with a single con crete pylon, this paper analyzes and studies the ultimate state of load-carrying capacity of concrete pylons checked in accordance with the specifications, gives proposal for exact value selection of the key parameter, i.e. the calculation length l0 of the eccentrically-compressed elements （pylons） and also makes up the insufficiency in the specifications in which the non-directional force effect of stay cables cannot be taken into account. In comparison to the calculation results obtained by the refined finite element model, the calculation of the ultimate load-carrying capacity of the pylons on the principle of selecting the values by the parameter and the improved method as provided in the paper is proved to be feasible.
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