- 目录
- 新型墙体材料与施工
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水泥聚丙烯纤维改性夯土墙体抗震性能研究
作者：李子奇1，2，李蒙恩1
（1．兰州交通大学 土木工程学院，甘肃 兰州 730070；
2．兰州交通大学 甘肃省道路桥梁与地下工程重点实验室，甘肃 兰州 730070）
摘要：为了解决生土结构力学性能较差，抗震、抗灾害能力较弱的问题，在生土中掺入水泥、聚丙烯纤维，制备素黄土、掺5%水泥、掺5%水泥和不同比例聚丙烯纤维的3种夯土墙，进行拟静力试验，研究改性夯土墙体的抗震性能。结果表明：与素黄土相比，掺5%水泥和1.8%~2.1%聚丙烯纤维可提高墙体的抗裂性、强度和延性，显著改善了墙体的脆性破坏特征，并且对墙体刚度退化的改善效果较好，增强墙体的塑性变形能力，提高墙体的抗震性能。
关键词：生土建筑；纤维复合材料；加固改造；抗震性能
中图分类号：TU361 文献标识码：A 文章编号：1001-702X（2022）07-0082-06
Study on seismic performance of rammed earth wall modified by cement polypropylene fiber
LI Ziqi1，2，LI Meng'en1
（1.School of Civil Engineering，Lanzhou Jiaotong University，Lanzhou 730070，China；2.Key Laboratory of Roads，Bridges and Underground Engineering in Gansu Province，Lanzhou Jiaotong University，Lanzhou 730070，China）
Abstract：In order to solve the problems of poor mechanical properties，low earthquake resistance and disaster resistance of raw soil structure，three groups of rammed earth walls with plain loess，5% cement，5% cement and polypropylene fiber with different proportions were prepared by mixing cement and polypropylene fiber into the raw soil. Quasi-static tests were carried out to study the seismic performance of the modified rammed earth walls. The test results show that，compared with plain loess，adding 5% cement and 1.8%~2.1% polypropylene fiber can better improve the crack resistance，strength and ductility of the wall，significantly improve the brittle failure characteristics of the wall，and improve the stiffness degradation of the wall better，enhancing the plastic deformation ability of the wall and increasing the seismic resistance of the wall.
Key words：raw soil building，fiber composite materials，reinforcement and reconstruction，seismic performance