中文摘要：

在考虑传力杆松动量的基础上，建立了重复荷载作用下刚性路面传力杆接缝模型，提出了以第一传荷状态临界荷载为特征的传荷能力评价指标和方法，研究了荷载大小、荷载作用位置及传力杆松动量对传力杆接缝传荷能力的影响，分析了重复荷载作用下弯沉传荷系数指标的适用性，并与考虑传力杆松动量的接缝传荷能力指标进行了对比研究。发现重复荷载作用下，接缝两侧的荷载一弯沉关系曲线具有分段线性的特征，存在多级传荷状态临界荷载，实测与计算第一传荷状态临界荷载误差仅为4．2％；重复荷载作用4×10^4次后，弯沉传荷系数变化范围为57．3％～71．5％，而考虑传力杆松动量的传荷能力为0～51．9％。结果表明考虑松动量影响的传力杆接缝力学模型是可靠的，以第一传荷状态临界荷载为特征的传荷能力评价指标和方法，能够反映刚性路面传力杆接缝的实际传荷状况，是评价其传荷能力的有效方法。

英文摘要：

Based on considering dowel loosened quantity, a doweled joint model of rigid pavement under repetitive loading was formed, a new method figured by the first critical load of loadtransfered condition was put forward to evaluate load-transfered capacity at joint, the effect of load size, load position and dowel loosened quantity on joint load-transfered capacity was studied, the applicability of existing load-transfered index figured by direct deflection ratio under repetitive loading was analyzed, and compared with that of new load-transfered index which took dowel loosened quantity into consideration. It is found that the relationship between load and deflection near joint under repetitive loading is subsection linear character, there exists several levels of critical loads, the error between field test load and calculated first critical load in load-transfered condition is only 4. 2%; direct deflection ratio changes from 57.3% to 71.5%, and load-transfered capacity with dowel loosened quantity changes from 0 to 51.9% after 4×10^4 times repetitive loading. Analysis result shows that the model is reliable, the new method can actually reflect the load-transfered status of doweled joint in rigid pavement under repetitive loading. 2 tabs, 4 figs, 14 refs.