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通过开展输电线路新型内置圆钢管斜柱扩展基础上拔和水平力组合荷载作用下的4个现场试验,分析了主柱配筋和锚固件设置方式对其承载性能影响规律,研究了该类型基础的破坏机理。结果表明:上拔水平力组合荷载作用下基顶荷载位移曲线具有明显的弹性、屈服阶段和破坏阶段;主柱纵筋可提高柱身强度,当柱身强度满足承载要求时,地基土体发生剪切破坏使得内置圆钢管斜柱扩展基础丧失承载能力,反之,则因钢管底锚上方剪压区混凝土达到极限状态引起基础破坏;锚固件可提高钢管、纵筋及基础扩大端的协同工作性,充分发挥各部分的力学性能,使得基础的受力状态更加合理。
By carrying out four field tests under the combined effect of the new type of built-in circular steel tube oblique column of transmission line and the combination of the horizontal force, the influence of the setting method of the main column reinforcement and the anchorage on the bearing capacity was analyzed. Destruction mechanism. The results show that the displacement curve of foundation top under horizontal combined force is obviously elastic, yielding stage and failure stage. The longitudinal reinforcement of the main column can improve the strength of the column body. When the column body strength meets the bearing requirements, Shear failure causes the built-in circular tube column to lose its bearing capacity. On the other hand, the foundation is damaged due to the concrete reaching the limit state in the shear zone above the bottom anchor of the steel pipe. Anchoring can improve the co-operation of the steel pipe, Give full play to the mechanical properties of various parts, making the foundation of the state of force more reasonable.