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为研究小半径曲线钢桥的最不利支座反力变化和脱空情况,以一曲线钢箱梁实体工程为对象,先建立理论模型,求解出理论最不利支座反力的加载影响线,并据此计算出现支座反力最不利情况的荷载分布,然后对梁体支座反力变化进行实际加载测试,利用不同载位检验支座的实际刚度,根据实际变形检测钢箱梁支座的反力变化,检验是否存在支座脱空情况。试验数据表明:该分析试验方法具有较好的可靠性;试验结果显示在最不利荷载作用下,分联墩处内支座受力最为不利,宜在设计施工中引起重视。
In order to study the most unfavorable counterforce variation and voidage of a small radius curve steel bridge, a curve steel box girder solid foundation engineering is taken as an object, and a theoretical model is established to solve the loading influence line of theoretical most adverse bearing reaction force. Based on this, the load distribution of the most unfavorable situation of bearing reaction force is calculated, and then the actual load test of the reaction force of the bearing of the beam body is carried out. The actual stiffness of the bearing seat is tested by using different bearing positions, and the bearing of the steel box girder Of the reactionary changes to test whether there is vacancy bearing. The test data show that the method has good reliability. The test results show that under the most unfavorable load, the inner bearing of the sub-piers is the most unfavorable force, which should be paid more attention in the design and construction.