Ordinary “loop joint” applied to precast prestressed concrete (PC) deck slab tends to increase its thickness. By decreas-ing this thickness, the dead load of the deck slab can be reduced. Hence, we have developed an “improved (inclined) loop joint” that reduces the deck slab thickness. This study presents the results of static bending test of slab specimens to confirm the load-carrying behavior and wheel moving load test to examine the fatigue durability of precast PC deck slabs with improved loop joints.

The bending load-carrying behavior satisfied the requirements for highways in Japan. In addition, in the wheel moving load test, no sudden increase in vertical deflection and joint opening was confirmed at a load step of 250 kN × 100 000 times equivalent to 100 years on an actual bridge. Moreover, there was no water leakage at the bottom surface of the deck slab during the water-filling test. Based on the test results, it was inferred that the required load-carrying behavior and fatigue durability could be retained for 100 years in the improved loop joint.

应用于预制预应力混凝土 (PC) 桥面板的普通“环缝”往往会增加其厚度。通过减小该厚度，可以降低桥面板的静载。因此，我们开发了一种“改进的（倾斜的）环形接头”，以减少甲板板的厚度。本研究介绍了板坯试样静态弯曲试验的结果，以确认承载行为和车轮移动载荷试验，以检查具有改进的环形接头的预制 PC 桥面板的疲劳耐久性。

弯曲承载性能满足日本高速公路要求。此外，在车轮移动载荷试验中，在实际桥梁上，在相当于 100 年的 250 kN × 100 000 次载荷步长下，没有确认垂直挠度和接头开度突然增加。此外，在充水试验中，桥面板底面没有漏水。根据试验结果推断，改进后的环形接头可以保持所需的承载性能和疲劳耐久性100年。