小边中跨比混合梁斜拉桥合理跨径布置方法研究
Study on Rational Span Arrangement Method for Lower Edge-to-Mid Ratio Hybrid Girder Cable-Stayed Bridges
混合梁斜拉桥受建设条件限制,往往需要采用更小的边中跨比值,然而在小边中跨比情况下,快速确定混合梁斜拉桥跨径布置的合理性尚需研究。针对小边中跨比的混合梁斜拉桥的跨径布置方式进行力学推导。从斜拉桥合理成桥状态出发,考虑主梁钢混交界面设置于边跨和中跨两种情况,推导了交界面位置合理取值范围的计算方法,得到了便于快速设计计算的公式,并给出了边中跨比最小取值计算方法。通过对多座建成的斜拉桥参数进行校验,论证了所提方法的准确性。利用该方法对闽安特大桥的跨径布置进行论证,桥梁在取更极限的小边中跨比的情况下仍然处于桥梁合理成桥状态。
When faced with stringent construction constraints, the span arrangement of steel-concrete hybrid girder cable-stayed bridges is required to reduce the edge-to-middle span ratios, which might fall below conventional values. In this case, the rapid determination of the rational span arrangement for the hybrid girder cable-stayed bridge requires further research. The span arrangement method for lower edge-to-mid ratio hybrid girder cable-stayed bridges is derived. Based on the rational dead load state of cable-stayed bridge, the calculation methods for determining the optimal range of the interface position between the steel girder and the concrete girder are given. Two scenarios of the interface position, edge-span and middle-span, are considered. Formulas are obtained to facilitate rapid design calculations. The calculation method for the minimum edge-to-middle span ratio is provided. The accuracy of the method proposed has been verified through the parameters of several completed cable-stayed bridges. This methodology has been validated by a span arrangement of Min’an Grand Bridge, which achieves the rational dead load state with an edge-to-middle span ratio below the typical values.
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