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探讨了沿海软土液化地基PHC管桩的抗震设计。结合桩基工程震害实例,依据桩基抗震设计原则,研究PHC管桩受地震作用的表现性状。认为PHC管桩的抗震承载力验算应采用较高的m值和土层阻力参数,对桩身内力计算时应考虑在轴力作用下的综合抗弯能力。提出PHC管桩的抗震设防建议,如增加螺旋箍筋、填实空芯、加强桩头与承台的连接。
The seismic design of PHC pipe pile in coastal soft soil liquefaction foundation is discussed. Combined with the example of seismic damage of pile foundation, according to the principle of seismic design of pile foundation, the characters of seismic behavior of PHC pipe pile are studied. Considering that the calculation of seismic capacity of PHC pipe pile should adopt higher m and soil resistance parameters, the comprehensive bending resistance under axial force should be considered in the calculation of pile internal force. Put forward the seismic fortification suggestions of PHC pipe piles, such as increasing the spiral stirrups, filling the hollow core, and strengthening the connection between pile head and cap.