曲线钢箱梁支座反力分析及处理措施探讨

小半径曲线连续钢箱梁桥在初始设计支承条件下，在最不利工况时，支反力出现较大负值。如果不采取措施，桥梁运营期支座可能会脱空，对桥梁及桥墩正常使用带来不利影响。根据曲线梁桥的特点，防止支座脱空一般采用设置拉压支座，或者梁端配重、支座横向调整等构造措施。文中结合设计实例，根据有限元计算，比较配重前后支座反力，结合钢箱梁自身特点，确定采用的最优构造措施，理论上解决支座脱空的问题。通过成桥静载试验证实采取的措施具有良好效果。

Analysis and Treatment Measures of Bearing Reaction of Curve Steel Box Girder

Under the supporting condition of initial design of the small radius curve continuous steel box girder, the bearing reaction is larger negativevalue in the most unfavorable case. If measures are not taken, bridges support is expected to be void, which will bring adverse effect to the normal use of the bridge and the bridge pier. According to the characteristics of the curve bridge, bearing separation can be prevented by setting the tension compression bearing, or counterweight of the beam end, bearing lateral adjustment and other structural measures. Combined with the design example, the supporting force before and after counterweight is compared based on the finite element computation, and according to its own characteristics the optimal structure of steel box girder is determined to solve the problem of bearing cavity in theory. Finally, bridge static load test results of experiments show that the measures have a good practical effect.