中文摘要：

为取得高精度的顶推施工槽形组合钢梁桥线形,提出采用传递矩阵法对顶推施工过程中各工况的线形进行预测与控制,选择节段间预拼角及梁段末端倾角作为线形控制参数,对顶推施工过程中各种线形状态之间的传递关系进行分析,并给出了描述拼装状态线形及顶推状态线形的传递方程表达式.以钱江八桥实际工程为对象,将所提出的方法应用于槽形组合钢梁顶推施工的线形控制,并对线形控制效果进行分析和评估.工程实践结果表明：测点线形误差为±1.0 cm,成桥及安装状态等各工况的线形满足要求,采用的基于传递矩阵思想的理论方法可以实现对槽形钢梁顶推施工线形的高精度控制.

英文摘要：

To achieve the highly accurate geometric shapes of the trough steel girder composite bridge constructed by the incremental launching method,the transfer matrix method was proposed to predict and control the geometric shapes of the bridge under different load cases in the incremental launching.The pre-assembling angles between the girder segments and the slope angles of the girder segment ends were chosen as the parameters for the geometric shape control,the transfer relations among the different geometric shape status in the incremental launching were analyzed and the transfer equation expressions describing the geometric shapes of the assembling and incremental launching status were given.By way of example of the project of the Eighth Qiantang River Bridge,the proposed method was applied to the geometric shape control of the trough steel girder composite bridge constructed by the incremental launching method and the effect of the geometric shape control was analyzed and evaluated.The results of the incremental launching show that the errors of the geometric shapes of the measurement points are ±1.0 cm.The assembling and completed bridge status of the bridge under the different load cases can meet the requirements.The application of the theoretic method based on the idea of the transfer matrix can realize the highly accurate control of the geometric shapes of the bridge constructed by the incremental launching method.