超高延性混凝土加固砌体墙抗震性能研究
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(1. 济南大学土木建筑学院,山东济南 250022)

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Seismic behavior of masonry wall strengthening with ultra-high ductility concrete
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(1.School of Civil Engineering and Architecture, University of Jinan, Jinan 250022,China)

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    摘要:

    为研究超高延性混凝土(Ultra-High Ductility Concrete,UHDC)加固砌体墙的抗震效果,对两个实心墙和两个空斗墙进行了低周反复加载试验,试验发现与未加固墙相比,加固后实心墙承载力提升31%,峰值位移降低了30%;加固后空斗墙承载力提升了223%,峰值位移提高了471%。利用OpenSees软件对UHDC加固墙体进行了建模分析了不同加固层厚度、加固方式及竖向压应力等因素对抗震性能的影响。研究结果表明:对于实心墙,加固层厚度为10mm、20mm、30mm时,峰值承载力分别提高16.0%、36.2%、56.1%,峰值位移分别降低了28.3%、26.7%、26.7%;对于空斗墙,加固层厚度为10mm、15mm、20mm时,峰值承载力分别提高117.4%、179.5%、243.4%,峰值位移分别提高345.5%、522.7%、506.1%.当竖向压应力为0.6MPa和0.9MPa时,实心墙峰值承载力较0.3MPa时分别提高16.8%和33.0%,峰值位移分别降低12.0%、16.0%;空斗墙峰值承载力较0.15MPa时提高6.5%和10.5%,峰值位移分别提高2.8%、0.0%。当分别采用整面加固、斜交条带加固、正交条带加固时,实心墙峰值承载力分别提高36.2%、12.0%、5.4%,峰值位移分别降低26.7%、28.3%、28.3%;空斗墙峰值承载力分别提高179.5%、80.1%、39.3%,峰值位移分别提高522.7%、203.0%、203.0%。最后提出了UHDC加固砌体墙抗剪承载力计算公式,经与试验和模拟结果比较,其理论值具有较好的精度,可为加固设计提供理论支持。

    Abstract:

    In order to study the seismic performance of masonry wall strengthened with Ultra-high Ductility Concrete (UHDC), cyclic experiment of two solid walls and two hollow walls had been carried out on. Compared with unreinforced wall, the strength of solid wall increased by 31% while peak displacement reduced by 30%. For hollow wall, the strength increased by 223%, and peak displacement dropped by 471%. OpenSees software was adopted to model UHDC reinforced masonry walls, and the influence of key parameters on seismic behavior, such as UHDC layer thickness, reinforcement mode and compressive stress, had been analyzed respectively. The results showed that the peak strength for UHDC solid wall increased by 16.0%, 36.2% and 56.1% respectively, when the UHDC layer thickness was 10mm, 20mm and 30mm respectively, however the peak displacement reduced by 28.3%, 26.7% and 26.7%, respectively. For hollow wall, the peak strength increased by 117.4%, 179.5% and 243.4% respectively, and peak displacement increased by 345.5%, 522.7% and 506.1% when the UHDC layer thickness is 10mm, 15mm and 20mm respectively. When the vertical compressive stress is 0.6MPa and 0.9MPa, the peak strength capacity of solid wall increased by 16.8% and 33.0% respectively over 0.3MPa, and the peak displacement reduced by 12.0% and 16.0% respectively; the peak strength of hollow wall increased by 6.5% and 10.5% over 0.15MPa, and the peak displacement increased by 2.8% and 0.0% respectively. When using whole surface reinforcement, oblique strip reinforcement and orthogonal strip reinforcement, the peak strength of solid wall increased by 36.2%, 12.0% and 5.4% respectively, however the peak displacement reduced by 26.7%, 28.3% and 28.3% respectively; the peak strength of hollow wall increased by 179.5%, 80.1% and 39.3% respectively, and the peak displacement increased by 522.7%, 203.0% and 203.0% respectively. Finally, the calculation formula of the shear bearing capacity of UHDC reinforced masonry wall is proposed. Compared with the test and simulation results, the theoretical value has good accuracy, which can provide theoretical support for the reinforcement design.

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吴孝鑫,谢 群,赵 鹏,井玉炜,林明强.超高延性混凝土加固砌体墙抗震性能研究[J].防灾减灾工程学报,,():

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  • 在线发布日期:2023-12-14
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