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用于带正交砌块填充墙的钢筋混凝土框架弹性抗震性能的可变形聚氨酯节点和纤维网格

Deformable Polyurethane Joints and Fibre Grids for Resilient Seismic Performance of Reinforced Concrete Frames with Orthoblock Brick Infills.

作者信息

Rousakis Theodoros, Ilki Alper, Kwiecien Arkadiusz, Viskovic Alberto, Gams Matija, Triller Petra, Ghiassi Bahman, Benedetti Andrea, Rakicevic Zoran, Colla Camilla, Halici Omer Faruk, Zając Bogusław, Hojdys Łukasz, Krajewski Piotr, Rizzo Fabio, Vanian Vachan, Sapalidis Anastasios, Papadouli Efthimia, Bogdanovic Aleksandra

机构信息

Civil Engineering, Democritus University of Thrace, 67100 Xanthi, Greece.

Civil Engineering Department, Istanbul Technical University, Istanbul, 34469, Turkey.

出版信息

Polymers (Basel). 2020 Nov 30;12(12):2869. doi: 10.3390/polym12122869.

DOI:10.3390/polym12122869
PMID:33266106
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7761037/
Abstract

The behaviour of reinforced concrete frames with masonry wall infills is influenced a lot by the stiffness and strength difference between the frame and the infill, causing early detrimental damage to the infill or to the critical concrete columns. The paper reports the results from shake table seismic tests on a full-scale reinforced concrete (RC) frame building with modified hollow clay block (orthoblock brick) infill walls, within INMASPOL SERA Horizon 2020 project. The building received innovative resilient protection using Polyurethane Flexible Joints (PUFJs) made of polyurethane resin (PU), applied at the frame-infill interface in different schemes. Further, PUs were used for bonding of glass fibre grids to the weak masonry substrate to form Fibre Reinforced Polyurethanes (FRPUs) as an emergency repair intervention. The test results showed enhancement in the in-plane and out-of-plane infill performance under seismic excitations. The results confirmed remarkable delay of significant infill damages at very high RC frame inter-story drifts as a consequence of the use of PUFJs. Further, the PUFJ protection enabled the resilient repair of the infill even after very high inter-story drift of the structure up to 3.7%. The applied glass FRPU system efficiently protected the damaged infills against collapse under out-of-plane excitation while they restored large part of their in-plane stiffness.

摘要

带有砌体填充墙的钢筋混凝土框架的性能受到框架与填充墙之间刚度和强度差异的很大影响，这会对填充墙或关键混凝土柱造成早期有害破坏。本文报告了在INMASPOL SERA 2020项目中，对一座带有改性空心粘土砖（正砌砖）填充墙的全尺寸钢筋混凝土（RC）框架建筑进行振动台地震试验的结果。该建筑在框架 - 填充墙界面采用了不同方案的由聚氨酯树脂（PU）制成的聚氨酯柔性接头（PUFJ），从而获得了创新性的弹性保护。此外，聚氨酯还用于将玻璃纤维网格粘结到薄弱的砌体基材上，形成纤维增强聚氨酯（FRPU）作为一种应急修复措施。试验结果表明，在地震激励下，填充墙的平面内和平面外性能得到了提升。结果证实，由于使用了PUFJ，在钢筋混凝土框架层间位移非常大时，显著延迟了填充墙的严重破坏。此外，即使在结构层间位移高达3.7%的非常大的情况下，PUFJ保护仍能使填充墙进行弹性修复。应用的玻璃纤维FRPU系统有效地保护了受损填充墙在平面外激励下不发生倒塌，同时它们恢复了大部分平面内刚度。

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