Bearing Capacity of pile against Rocking of Tall Buildings under Earthquake Motions

地震作用下高层建筑桩的抗摇承载力

• 批准号: 05650530
• 负责人: OZAKI Masakazu
• 金额: $ 1.47万
• 依托单位: Chiba University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650530/
• 关键词: Footing Pile; Repeated Loading; Pull-out; Rocking; Response of Earthquake Motion; Bearing Capacity; Skin Friction Resistance; Model Ground of Sand; 基礎杭

First of all, we considered structural response at the strong earthquake ground motions, and estimated properties of repeated load for footing piles. Then, model tests were carried out, using model pile and model ground of sand. For the control of small pull-out, jig was ingeniously improved. Two kinds of diameters were used in the tests for effective measurement. Skin friction resistance decreased by the number of times of repeated loading when the number was less then five times. The skin friction resistance was about 40% smaller than the case of no pulling-out when the number of repeated loading was more than five times. In the tests, the ratio of shear forces were stable. This means that skin friction resistance was related with lateral soil pressure. After Kobe earthquake, occures on January 17,1995, velocity of loading has been noted. On this project, the effect of velocity was not estimated. The effect of velocity should be investigated by the other ways.

首先考虑了结构在强震作用下的响应，并对基础桩的重复荷载特性进行了估计。然后，利用模型桩和模型砂土进行了模型试验。针对小拔出的控制，对夹具进行了巧妙的改进。试验中采用了两种直径进行有效测量。当重复加载次数小于5次时，摩擦阻力随重复加载次数的增加而减小。当重复加载次数大于5次时，表面摩擦阻力比无拔出情况小40%左右。在试验中，剪力比是稳定的。这意味着表皮摩擦阻力与侧土压力有关。1995年1月17日，神户地震发生后，荷载速度被记录下来。在这个项目中，没有估计速度的影响。速度的影响应通过其他方法来研究。