【单选题】【消耗次数：1】
结构静力试验的试验加载制度是()
①
采用控制荷载或变形的低周反复加载
②
采用包括预加载、设计试验荷载和破坏荷载的一次单调加裁
③
采用正弦激振加载
④
采用模拟地面运动加速度地震波的激振加载
参考答案：
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单向多循环加载法测定单桩横向承载能力时，极限荷载可取：（）。
①
荷载－时间－位移（H0-T-U0）曲线明显陡降（即位移包络线下凹）的前一级荷载；
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P-S曲线上明显拐点处所对应的荷载；
③
S-lgt曲线线形由直线变为折线时所对应的前一级荷载；
④
荷载-位移梯度（H0-ΔU0/ΔH0)曲线第二直线段终点对应荷载
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can have gone
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should have gone
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must have gone
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ought to have gone
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until
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