中文摘要：

为研究不同构造的铰接板桥铰缝的疲劳性能,采用深铰缝和浅铰缝两种形式的铰接板桥进行试验研究,通过对跨中铰缝顶底部混凝土的横向应变规律及铰缝内部横向连接钢筋的应变规律进行对比分析,对铰缝的疲劳性能进行研究。试验结果表明,在200万次疲劳荷载以前,由于疲劳幅值相对较小,随着疲劳次数的增加,完成一定疲劳循环后施加静载时铰缝混凝土及钢筋的应变值逐渐减小,应变值的变化趋于更加稳定。当疲劳次数超过200万次后,由于疲劳幅值的增加,疲劳荷载对浅铰缝的破坏产生较大的影响,而对深铰缝则未产生较明显的影响。因此,超过一定幅值疲劳荷载是造成浅铰缝破坏的一个主要因素,深铰缝构造的抗疲劳破坏性能要远好于浅胶缝构造的抗疲劳破坏性能。

英文摘要：

For the research on fatigue performance of hinge joints with different structures ,two hinged slab bridges with deep hinge joints and shallow hinge joints were adopted in the experiments .Based on the results of the transverse strains regularity of hinge joints at the middle span of hinged slab ,the researches on the fatigue performance of the hinge joints were carried out .The transverse strains of hinge joints include the concrete transverse strain at the bottom and the top of hinge joints ,and the transverse strain of the connection steels in hinge joints .The experimental results suggest that , within 2 ＆#215; 106 times of fatigue load ,due to the relatively small fatigue amplitudes ,the concrete and reinforcement strain values of hinge joints decrease as static load applied after the fatigue cycle of certain numbers ,with the increasing of fa-tigue cycle number ,the changes of the strain values tend to be more stable .When the fatigue cycle number is more than 2 ＆#215; 106 times ,as the fatigue amplitudes increase ,the influence on the damage of shallow hinge joints by fatigue load is great ,but no obvious influence on deep hinge joints .Therefore ,the fatigue load with certain fatigue amplitude is a major factor which causes the destruction of shallow hinge joints ,and the fatigue damage resistance performance of deep hinge joints is much better than shallow hinge joints .