一种新型薄壁钢管-钢板组合式钢腹板力学行为研究

Study on the Mechanical Behavior of a New Type of Thin-Walled Steel Tube-Steel Plate Composite Web

摘要: 不同于波形钢腹板，本文提供了一种新型的薄壁钢管–钢板组合式钢腹板。理论分析表明，通过钢管的变形可以降低此类钢腹板的纵向综合刚度，以达到波形钢腹板相同的效果，即降低钢腹板对钢–混组合箱梁桥中混凝土顶底板的约束作用，减小混凝土顶底板预应力、收缩、徐变以及温度作用的影响。与此同时，薄壁钢管–钢板组合式钢腹板构造简单，避免了复杂的空间曲线焊缝和波形钢板的压制，可以有效降低腹板的加工难度和成本。对比分析还表明，薄壁钢管–钢板组合式钢腹板在相同刚度指标下，用钢量指标与波形钢腹板相当。本文初步证明这种新型的薄壁钢管–钢板组合式钢腹板具有一定的合理性和经济性。

Abstract: In contrast with corrugated steel webs, a new type of thin-walled steel tube-steel plate composite webs is proposed in the paper. The theoretical analysis shows that prestressing, shrinkage, creep, and temperature changes in concrete flanges have little effect on the thin-walled steel tube-steel plate composite webs which are also exhibited in corrugated steel webs, due to the reduction of stiffness result from deformation of steel tube. Meanwhile, the composite steel web with thin- walled steel tube-steel plate composite web is simple in construction, which avoids the complex spatial curve weld and pressing of corrugated steel plate, and thus there should be a reduction in the difficulty and cost of construction. The comparative analysis also shows that the composite web has the same steel consumed index as that of corrugated steel webs based on the same stiffness index. This paper preliminarily proves that this new type of thin-walled steel tube-steel plate composite steel web is reasonable and economical.