矮塔斜拉桥施工阶段线形敏感性分析

文章以某双塔单索面预应力混凝土矮塔斜拉桥为工程背景,研究矮塔斜拉桥施工阶段线形对结构自重偏差、混凝土受力龄期、系统温差、索塔温度梯度、主梁梁温度梯度、索梁温差、斜拉索张拉力偏差、主梁预应力张拉力偏差等参数的敏感性,并引入敏感性评价参数α,合理评价各种参数对施工阶段桥梁线形的影响程度。研究结果表明:温度作用对施工阶段桥梁线形影响较大,矮塔斜拉桥的施工监控应加强温度监测;主梁自重偏差对施工阶段桥梁线形也影响较大,施工中应严格控制混凝土方量误差。

Linear Sensitivity Analysis at Construction Phase of Extradossed Cablestayed Bridge

Taking a dual-tower single-cable prestressed concrete extradossed cable-stayed bridge as engineering background,this article studied the sensitivity of extradossed cable-stayed bridge con-struction phase linear on structural weight bias,age of concrete strength,system temperature difference,temperature gradient of cable tower,girder temperature gradient of main girder,temperature difference of cable girder,cable-stayed tension deviation,prestressed tension deviation of main girder,and other parameters,and introduced the sensitivity evaluation parameterα,with the rational evaluation on the influence degree of various parameters on the bridge linear at construction phase.The research results showed that：the temperature effect has a larger impact on the bridge linear at the construction phase,thus the temperature monitoring should be strengthened during the extradossed cable-stayed bridge construction monitoring;the weight deviation of main girder has also a larger impact on the bridge linear at construction phase,thus the concrete amount errors should be strictly controlled during the construction.