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中文摘要：
进行了服役期间组合荷载下桥上纵连板式无砟轨道HRB500钢筋随机变幅疲劳应力谱平均应力修正模型和累积损伤模型研究，以便为组合荷载下桥上纵连板式无砟轨道HRB500钢筋疲劳寿命预测模型的建立提供支撑．通过对HRB500钢筋标准试件进行等幅疲劳试验，研究平均应力对HRB500钢筋疲劳寿命的影响规律，并在此基础上，研究工程上常用的疲劳应力谱平均应力修正模型对服役期间组合荷载下桥上纵连板式无砟轨道HRB500钢筋的适用性；通过对HRB500钢筋标准试件进行三级变幅疲劳试验，分析Miner准则计算服役期间组合荷载下桥上纵连板式无砟轨道HRB500钢筋累积损伤的适用性．研究结果表明，HRB500钢筋标准试件疲劳寿命随平均应力的增大而减小，工程上广泛采用的Goodman模型适用于随机变幅荷载下HRB500钢筋平均应力修正；Miner准则能较好地适用于服役期间组合荷载下桥上纵连板式无砟轨道HRB500钢筋累积损伤计算．
英文摘要：
The mean stress correction model of random-amplitude fatigue stress spectrum and cumula- tive damage model for HRBS00 reinforcing bar used in longitudinally connected ballastless track on bridge in service life under combined loads were studied to provide the support for the establishment of fatigue life prediction model for above mentioned HRB500 reinforcing bar. Through the constant-amplitude fatigue tests on standard specimens of HRB500 reinforcing bar, the influence law of mean stress on fatigue life of HRBS00 reinforcing bar was studied, and the applicability of mean stress correction models of random-am- plitude fatigue stress spectrum commonly used in practical engineering to HRBS00 reinforcing bar was studied.Through the three-level variable-amplitude fatigue tests on standard specimens of HRB500 reinforcing bar,the applicability of Miner＇s rule to the calculation of cumulative damage of the HRB500 reinfor- cing bar was analyzed.The research results show that the fatigue life of standard specimens of HRB500 re- inforcing bar decreases with the increase of mean stress, Goodman model widely used in practical engineer- ing is applicable to the mean stress correction of HRB500 reinforcing bar under random-amplitude loading, and Miner＇s rule is suitable to calculate the cumulative damage of HRB500 reinforcing bar used in longitu- dinally connected ballastless track on bridge in service life under combined loads.
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