福建建设科技
福建建設科技
복건건설과기
FUJIAN CONSTRUCTION SCIENCE & TECHNOLOGY
2012年
5期
5-7,27
,共4页
PHC管桩%水平承载力%竖向荷载%数值模拟%弥散开裂模型
PHC管樁%水平承載力%豎嚮荷載%數值模擬%瀰散開裂模型
PHC관장%수평승재력%수향하재%수치모의%미산개렬모형
PHC pile%Horizontal bearing capacity%Vertical load%Numerical simulation%Smeared cracking model
竖向荷载对桩基水平承载力的影响较为复杂,目前确定桩基水平承载力通常不考虑竖向荷载的影响。采用数值模拟的方法研究竖向荷载对PHC管桩水平承载力的影响,混凝土采用弥散开裂模型,桩周土采用Mohr-Coulomb模型,并考虑了纵筋预应力的作用。模拟结果显示竖向荷载显著增大了单桩的水平临界荷载Hcr和开裂弯矩Mcr,同时增大了桩身位移。认为竖向荷载较大时应考虑其对单桩水平承载力影响。结论对桩基水平承载力的设计有一定指导意义。
豎嚮荷載對樁基水平承載力的影響較為複雜,目前確定樁基水平承載力通常不攷慮豎嚮荷載的影響。採用數值模擬的方法研究豎嚮荷載對PHC管樁水平承載力的影響,混凝土採用瀰散開裂模型,樁週土採用Mohr-Coulomb模型,併攷慮瞭縱觔預應力的作用。模擬結果顯示豎嚮荷載顯著增大瞭單樁的水平臨界荷載Hcr和開裂彎矩Mcr,同時增大瞭樁身位移。認為豎嚮荷載較大時應攷慮其對單樁水平承載力影響。結論對樁基水平承載力的設計有一定指導意義。
수향하재대장기수평승재력적영향교위복잡,목전학정장기수평승재력통상불고필수향하재적영향。채용수치모의적방법연구수향하재대PHC관장수평승재력적영향,혼응토채용미산개렬모형,장주토채용Mohr-Coulomb모형,병고필료종근예응력적작용。모의결과현시수향하재현저증대료단장적수평림계하재Hcr화개렬만구Mcr,동시증대료장신위이。인위수향하재교대시응고필기대단장수평승재력영향。결론대장기수평승재력적설계유일정지도의의。
Vertical load has a complex impact on the horizontal bearing capacity of pile foundation. At present, the horizontal bearing capacity is ascertained irrespective of the influence of vertical load. Finite element method is employed to research the influence of vertical load on horizontal bearing capacity of PHC pile in this paper. Concrete of pile body is simulated with smeared cracking model, surrounding soil with Mohr - Coulomb model, and the prestress of longitudinal bar is considered as well. It is shown that vertical load can improve the horizontal critical load and cracking moment, but increase the displacement of pile body simultaneously. The result could conduct the design of horizontal bearing capacity of pile foundation.
