独柱支承梁式桥抗倾覆加固试验研究

Experimental Study on Anti-dumping Reinforcement of Single-column Bearing Beam Bridge

结合上海市城市高架独柱墩曲梁安全隐患整治工程,通过足尺试验研究加固方案的适用性,并对加固后的受力模式和传力机理进行探究,为加固方案的精准优化及实施提供有力支撑。试验表明:试验中增设的钢盖梁最大承载力为280 t,满足设计(160 t)要求;当荷载小于150 t时,超高性能混凝土(UHPC)与构件之间不发生黏结破坏,达到设计荷载的0.93倍时栓钉开始参与受力;所进行的试验为加固方案提供了优化方向,也为类似工程的实施提供了参考和依据。

Combined with the potential safety hazard treatment projects of urban elevated single-column pier curved beam in Shanghai, the applicability of reinforcement scheme is studied by full scale test. The stress mode and load-transferring mechanism after reinforcement are explored and studied in order to provide the powerful support for accurate optimization and implementation of reinforcement scheme. The test shows that the maximum bearing capacity of the steel bent cap added in this test is 280 t, which meets the design(160 t) requirement. When the load is less than 150 t, no bond failure occurs between the ultrahigh performance concrete(UHPC) and the component. When the design load is 0.93 times, the studs begin to participate in the stress. An optimization direction is provided through this test for the reinforcement scheme, which can be referred for the implementation of the similar projects.