大跨刚构连续梁劲性骨架和托架设计的温度作用力

劲性骨架的构造形式及承载力分析是连续刚构桥和龙段设计的重要环节.从连续梁劲性骨架设置因素出发,结合工程实例,通过理论分析、现场试验研究和龙前在温度作用下的梁端下挠力及挤压力进而阐述温度作用力对梁体线形及挠度引起的变化,以此总结分析温度作用力对劲性骨架及托架的影响,得出结论：轴向作用力远小于理论值,剪切力与理论相符,由此为劲性骨架和托架设计提供依据.

Temperature Force of Steel Skeleton and Bracket Design for Large Span Concrete Continuous Beam

The analysis on construction form and bearing capacity of stiff skeleton is an important part in design of the closure section of rigid frame bridge. From the setting factors of the continuous beam skeleton and combining with the engineering example, the change of beam shape and deflection is explained through studying the change of temperature force on the beam ends flexural stress and extrusion force based on theoretical analysis and field test, which help to summary the effect of the temperature force on rigid framework and bracket. Some conclusions are derived as： axial force is less than the theoretical val- ue, the shear force is consistent with the theory of character, which can provide the basis for strength frame and bracket design.