自锚式悬索桥索鞍无预偏施工吊杆张拉的优化研究

Optimization Research of Construction of Hanger Tensioning for Self-Anchored Suspension Bridge With No Pre-Offsetting of Cable Saddles

自锚式悬索桥吊杆张拉施工是一个重复性的过程,为了减少吊杆张拉的次数,基于优化原理,对某索鞍无预偏自锚式悬索桥吊杆张拉过程建立非线性规划的优化模型,提出考虑几何非线性影响的影响矩阵迭代方法,并采用通用编程软件MATLAB中的优化功能模块进行运算,最后将计算结果写入有限元软件模拟真实施工过程,证明该方法的有效性。结果表明:该方法减少了吊杆张拉施工时吊杆力施加的盲目性,优化后的吊杆张拉施工中,桥塔的偏位和应力得到了很好的控制,保证了施工过程中主梁和桥塔结构的安全。

The construction of the hanger tensioning for self-anchored suspension bridge is a construction of repeated process.To reduce the times of the tensioning,the optimization model of nonlinearity program was set up for the tensioning process of hangers of a self-anchored suspension bridge with no pre-offsetting of cable saddles in accordance with the optimization principles.The iterative method of influence matrix that takes into account of the influence of geometric nonlinearity was proposed and was computed by the optimization function modules of the general programming software MATLAB and consequently the computation results were written into the finite element software to simulate the real construction process and to verify the effectiveness of the method.The results of the research show that the method has reduced the blindness of force applying to the hangers in the construction of the tensioning and in the optimized construction,the displacement and stress of towers of the bridge have been brought under very good control and the safety of main girder and tower structure in the construction process has been ensured as well.