【摘要】 建立接缝无传力杆及设传力杆时水泥混凝土面层结构的三维有限元模型,运用数值分析方法,分析接缝处水泥混凝土面层的荷载应力、弯沉值和弯沉差,研究了地基模量、传力杆直径对荷载应力及弯沉差的影响规律,并对条件相同的计算结果进行了对比分析。结果表明:计算点的主应力、剪应力、弯沉值和弯沉差随着传力杆直径的增加而呈现减小趋势;当传力杆直径大于35 mm时,传力杆直径的增加对降低水泥混凝土面层内计算点的应力值效果已不明显;接缝设传力杆时水泥混凝土面层计算点荷载应力和弯沉差明显小于无传力杆时相应的计算结果;当地基模量不大于800 MPa时,建议基于剪应力去估计接缝传荷效率;当地基模量大于800 MPa时,建议基于弯沉值或主应力去估计接缝传荷效率。更多还原

【Abstract】 3D finite element model of concrete pavement in transverse joint with dowel bars or without dowel bars is established by 3D finite element numerical analysis method.The load stress,deflection value and deflection value’s difference of concrete pavement in transverse joint are calculated and analyzed by 3D finite element method.The influence of foundation’s modulus and dowel’s diameter on both stress and deflection is analyzed.And the calculating results with the same factors are compared.The results indicate that principal stress,shearing stress,deflection value and deflection value’s difference from calculating points decrease when dowel’s diameter increases;when dowel’s diameter is more than 35 mm,the increase in dowel’s diameter does not contribute to the loss of stress of calculating points in concrete pavement;the stress value and deflection value’s difference of calculating points for concrete pavement in transverse joint with dowel bars are smaller than counterpart without dowel bars;when foundation’s modulus is not more than 800 MPa,analysis of transmission efficiency of loading should be based on shearing stress,and when foundation’s modulus is more than 800 MPa,analysis of transmission efficiency of loading should be based on either deflection or principal stress.3 tabs,20 figs,7 refs.更多还原