【摘要】 由于环境温度使主梁发生胀缩变形，导致整体桥桥台水平往复运动及桥台-土、桩基-土的相互作用。本文以某整体桥为工程背景，开展基于昼夜温度、季节性温度变形效应的整体式桥台-H型钢桩-土体系的低周往复位移荷载拟静力试验，分析试件的滞回性能、骨架曲线、桥台转角等变化规律。试验结果表明：试件全年滞回曲线可视为季节性温度作用、昼夜温度作用的滞回曲线叠加。从季节性温度作用来看，受春夏季升温影响，MTS水平力先快速增大，随后持续升温，水平力增速放缓；受夏秋季、秋冬季连续降温的影响，水平力先急剧减小，而随后持续降温，水平力降低减缓；受冬春季升温影响，水平力先急剧增加后增速放缓，其增速与第一次春夏季升温时相似，但由于台后土发生累积效应，产生的水平力更大。从昼夜温度作用来看，当环境温度较高时(夏季),夜晚降温对体系相互作用的影响大于白天升温时的影响；当环境温度较低时(冬季),白天升温对体系相互作用的影响大于夜晚降温时的影响。从骨架曲线来看，受中长期环境温度影响，整体式桥台-桩-土体系相互作用中存在由非线性向线性不断转化的过程。在加载初期，桥台转角与加载位移变化规律基本一致，随着环境温度变化，两者逐渐偏离，特别是在次年的第一季度，两者已产生较为明显的正方向偏移。更多还原

【Abstract】 The swelling-shrinkage deformation of the main girder of the integral abutment bridge caused by the ambient temperature leads to the horizontal reciprocating motion of the abutment and the interaction between the abutment-soil and the pile-soil. In this paper, based on the case study of an integral abutment bridge, a quasi-static test of low-cycle reciprocating displacement load of integral abutment-H-shaped steel pile-soil system based on diurnal temperature and seasonal temperature deformation effect was carried out to analyze the hysteretic behavior, skeleton curve and abutment angle of the specimens. The results show that the annual hysteretic curve of the specimen can be regarded as the superposition of the hysteretic curves of seasonal temperature and diurnal temperature effects. From the point of view of seasonal temperature effect, affected by the temperature rise in spring and summer, the MTS horizontal force increases rapidly at first. With subsequent continuous temperature rise, the horizontal force growth slows down. Under the influence of continuous temperature drop in summer and autumn, autumn and winter, the horizontal force decreases sharply at first, before decreasing slowly as the temperature continues to drop. Affected by the temperature rise in winter and spring, the horizontal force first increases sharply before slowing down. Its growth rate is similar to that of the first temperature rise in spring and summer. Due to the cumulative effect of the soil behind the abutment, the horizontal force is even greater. From the point of view of the effect of diurnal temperature, when the ambient temperature is high(in summer), the effect of temperature drop at night on the interaction of the system is greater than that of temperature rise during the daytime. When the ambient temperature is low(in winter), the effect of daytime temperature rise on the system interaction is greater than that of nighttime temperature drop. From the perspective of skeleton curve, due to the influence of medium and long-term ambient temperature, a process of nonlinear to linear transformation exists in the interaction of integral abutment-pile-soil system. In the initial stage of loading, the rotation angle of the abutment is basically consistent with the change law of loading displacement. With the change of ambient temperature, the two gradually deviate. Especially in the first quarter of the next year, the two have produced a more obvious positive direction deviation.更多还原