超高性能混凝土剪力键混凝土桥梁上部结构

结构和土木工程国际会议上的研究

2019年6月07日|巴黎,法国

Elsy Y弗洛雷斯,约旦Varbel,威廉K托莱多,克雷格·M Newtson和布拉德韦尔登

美国新墨西哥州立大学

海报和接受抽象:飞机

文摘

这项研究调查了使用国产超高性能混凝土(UHPC)作为注浆材料修复恶化剪力键。剪力键用于相邻梁上层建筑产生整体行为和荷载传递结构。剪力键耐用性是一个关注由于剪力键退化可以危及结构的完整性。运输机构在美国报道,75%的相邻梁桥梁裂缝是由于开裂和de-bonding剪力键。先前的研究已经表明,国产UHPC具有良好的机械和持久性属性。UHPC也被证明具有良好的成键特征中可取的一个潜在的灌浆材料。进行了一些测试来评估潜在的UHPC作为剪力键灌浆材料。UHPC灌浆和基材之间粘结强度的混凝土使用slant-shear和直接张力测试评估。结果表明,适当的债券达到了七天。低的优势在28天观察由于衬底的低强度混凝土。 Shrinkage of UHPC grout was also investigated. Shrinkage at 28 days was less than 600 μ strain which is acceptable for repair practices. Full-scale testing was used to evaluate load-deflection behavior of channel girder assemblages with grouted shear keys. Results showed that UHPC grout and non-shrink grout had similar mechanical performance. Excellent bond was achieved with all grouts, even with minimal surface preparation. In fact, the shear keys remained bonded to the girders even when service load deflections were exceeded and no lateral restraint, such as post-tensioning, was provided. The similar performances of the non-shrink grout and the UHPC grout indicates that UHPC grout does not provide a mechanical benefit over the non-shrink grout.

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