大跨连续刚构桥长期下挠的设计成因参数化分析

Parameterized Analysis of Design Causes for Long-term Downward Deflections of Long-span Continuous Rigid Frame Bridge

以桐山溪特大桥为研究对象,对影响大跨连续刚构桥长期下挠的设计构造因素进行参数化分析。参数化分析研究了主梁高度、梁底曲线形状、底板厚度、桥墩高度等因素对下挠的影响,并进一步分析了上述参数变化对下挠效应的影响规律,并对相应的应对措施进行了探讨。通过研究,明确了构造等主要参数对长期下挠的影响及合理参数取值范围,并提出了设计的应对策略,可以让更多的桥梁工程师认识到设计阶段参数控制对刚构桥下挠的影响程度,为同类桥梁的设计提供参考。

Taking Tongshanxi Bridge as the study object,parametric analysis of design structural factors affecting long-term downward deflections of the long-span continuous rigid frame bridge is carried out.In the paper the influence of main beam depth,curve shape at the bottom of the beam,bottom slab thickness and pier height to downward deflection of rigid frame bridges are mainly studied.Furthermore,influence law of the above parameters to downward deflections are analyzed.Meanwhile,countermeasures are discussed after the analysis.Through the research,the influence law of the main parameters to the long-term downward deflection and reasonable parameter value ranges are clarified.Finally,advices in design stage are proposed.The paper can not only make more bridge engineers understand the role of parameters control to the downward deflection of rigid frame bridge in the design stage,but also provide reference for the design of similar bridges.