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为研究双重组合作用对大跨钢-混凝土连续组合箱梁桥受力性能的影响,通过对潍坊市跨济青高速立交桥现场静载试验研究,采用有限元方法对2种模型计算结果及现场实测结果进行比较分析,并对双重组合箱梁下层混凝土板的长度与主跨长度之比和混凝土板厚度与钢梁底板厚度之比2个变量进行参数分析。研究结果表明:双重组合箱梁下层混凝土板有效降低钢梁下翼缘的应力;考虑双重组合作用后,连续组合梁桥结构刚度及支点负弯矩略有增加,中跨跨中挠度及正弯矩略有减小,最大幅度不大于10%。
In order to study the effect of double combination on the mechanical performance of long-span steel-concrete composite continuous box girder bridge, on the spot static load test research of Weijiajijiaqing high-speed overpass, finite element method was used to calculate the results of the two models and field measurements The results were compared and analyzed. The parameters of the ratio of the length of the lower concrete slab to the length of the main span of the double composite box girder and the ratio of the thickness of the concrete slab to the thickness of the steel slab floor were analyzed. The results show that the concrete slab beneath the double composite box girder can effectively reduce the stress of the lower flange of the steel girder. Considering the double combination effect, the rigidity of the composite girder bridge and the negative bending moment of the fulcrum slightly increase, Moment slightly reduced, the maximum range of not more than 10%.