多跨系杆拱桥组合梁剪力钉受力性能分析

Analysis on the Shear Studs in Composite Girders of Multi-Span Tied Arch Bridge

通过推出试验确定剪力钉荷载滑移曲线得到剪力钉的刚度取值,进而建立了考虑钢与混凝土之间相对滑移的某三跨连续下承式系杆拱桥有限元分析模型.分析了在温度作用和车辆荷载作用下剪力钉的受力情况,利用增量方法分析了恒载效应随着混凝土的收缩徐变的时间发展历程.分析结果表明,局部温差作用对剪力钉的受力影响较大,端横梁处剪力钉的受力较中横梁处剪力钉受力要大;由于收缩徐变的作用,随着时间发展恒载引起的剪力钉受力相比于成桥时有所减少.

The load-sliding curve and the shear stiffness of the shear studs can be derived from push-out tests, and furthermore the finite element analysis model of steel-concrete composite beams which take into account the sliding between the steel and concrete is establised the stud force of a three span through tied arch bridge under temperature and vehicle load is analyzed and the result shows that the influence of daily femperature effects is significant near the end cross beam. The time dependent behavior of the dead load effects due to the shrinkage and creep of the concrete is analyzed with the step by step method, and the calculation result shows that the stud force decreases along with the time.