【摘要】 针对新型波形钢腹板(corrugated steel web, CSW)组合箱梁在日照辐射和变温环境影响下结构温度呈现不均匀分布,从而引起结构动力特性变化的问题。基于应力等效原则提出一种时变温度作用下考虑钢-混接触面滑移效应的新型波形钢腹板组合箱梁自振频率解析计算方法。以一根跨径为8.0 m的新型波形钢腹板简支组合箱梁为研究对象,对试验梁进行有限元模拟分析和解析计算,并与现场实测值进行对比分析,验证所提方法的可靠性,揭示了时变日照温度对新型波形钢腹板组合箱梁动力特性的影响机理。结果表明:时变温度会引起新型波形钢腹板组合箱梁频率的显著改变,各阶振型频率与温度呈线性负相关关系;混凝土弹性模量的改变是波形钢腹板组合箱梁时变温度动力特性变化的关键因素;温度引起新型波形钢腹板组合箱梁前3阶模态频率的相对变化可达5.2%～7.3%,在该类桥梁动力特性测试与结构性能评估中应考虑温度影响。更多还原

【Abstract】 Under the influence of sunshine radiation and variable temperature environment, the structural temperature of a new type of composite box girder with corrugated steel web(CSW) presents uneven distribution, which causes the change of static and dynamic characteristics of the structure. In this work, a new analytical method for the calculation of the natural frequency of a composite box girder with CSW was proposed based on the stress equivalence principle, which considers the slip effect of steel-concrete interface under the action of time-varying temperature. Taking the new type of simple supported CSW composite box girder with a span of 8.0 m as the research object, the finite element simulation analysis and analytical calculation were carried out for the test beam, and the comparison was made with the field measured value. The results show that: time-varying temperature will cause significant change in the frequency of the new-pattern CSW composite box girder; the change of the elastic modulus of concrete is the key factor of the dynamic characteristic of CSW composite box girder; the temperature causes the relative change of the 3 rd-order modal frequency of the new-pattern CSW composite box girder up to 5.2%-7.3%, and the influence of temperature effect should be considered in the dynamic characteristic test and structural performance evaluation of this type of bridge.更多还原