基于正交试验法的大跨连续刚构桥主梁设计参数影响研究

Abstract

对某连续刚构桥的主梁截面参数中的主跨0号块梁高高跨比、主跨跨中梁高高跨比、梁底抛物线次数参数在适用范围内选择取值，应用正交试验法对所选择的参数进行组合和数值建模计算，得到了综合性能较好的设计参数组合形式。采用极差分析的方法研究了以主梁跨中应力、挠度和全桥混凝土用量为综合指标的各参数的影响程度。研究表明：主跨跨中梁高高跨比对综合性能指标影响最大，梁底抛物线次数，根部梁高高跨比的影响较小，其中梁底抛物线次数对主梁综合性能的影响稍大于0号块梁高高跨比。 The design parameters, central beam high-span ratio, high-span ratio at root of the beam and beam bottom curve line, of continuous rigid frame bridge girder were valued in an appropriate range. Based on orthogonal experiment and numerical simulation, the effects of above parameters to the comprehensive performance index on the basis of stress, deflection and concrete volume were studied by the parameters combinations and the calculation of the text models. The result shows that the central beam high-span ratio has the greatest impact on the comprehensive performance index, while the high-span ratio at root of the beam and the beam bottom curve line have less influence. In addition, the impact of the beam bottom curve line is larger than the high-span ratio at root of the beam.