内置草绳增强承重夯土墙体抗震性能试验研究

虞庐松; 宋书豪; 李子奇; 王力; 李健宁

doi:10.11899/zzfy20230418

内置草绳增强承重夯土墙体抗震性能试验研究

doi: 10.11899/zzfy20230418

虞庐松^1,,
宋书豪¹,
李子奇^{1, 2, ,},
王力^{1, 2},
李健宁^{1, 2}

1.
兰州交通大学, 土木工程学院, 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, 兰州 730070

基金项目: 甘肃省高等学校青年博士基金项目（2023QB-045）；中央引导地方科技发展资金项目（ 22ZY1QA005）；陇原青年创新创业人才（团队）项目；兰州交通大学甘肃省重点实验室开放课题（2022055）

详细信息

作者简介:
虞庐松，男，生于1968年。博士，教授，硕士生导师。主要从事桥梁抗震工作。E-mail：yulusong@mail.lzjtu.cn

通讯作者:
李子奇，男，生于1974年。博士，副教授，硕士生导师。主要从事结构抗震工作。E-mail：46939099@qq.com

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出版历程
- 收稿日期: 2022-09-07
- 刊出日期: 2023-12-01

Experimental Study on Seismic Performance of Built-in Straw Rope Reinforced Load-bearing Rammed Earth Wall

Yu Lusong^1
,,
Song Shuhao¹,
Li Ziqi^{1, 2
, ,},
Wang Li^{1, 2},
Li Jianning^{1, 2}

1.
School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
2.
Key Laboratory of Road and Bridge and Underground Engineering of Gansu Province, Lanzhou Jiaotong University, Lanzhou 730070, China

摘要

摘要: 为了解决夯土墙体夯筑分层处受力薄弱的问题，本文提出一种内置草绳增强承重夯土墙体性能的方法，以草绳含量及埋置高度为变量，对4片夯土墙体1/3缩尺模型进行拟静力试验，探究其破坏形态、承载及变形能力、耗能能力、刚度退化等抗震性能。试验结果表明：内置草绳可提高墙体各夯筑层间粘结性，延缓夯筑分层处水平裂缝的开展及贯通，从而提高墙体整体性，此外其对墙体承载能力、变形能力均有提升，且提升率与草绳高度呈正相关，二者分别提升108.3%和35.6%；内置草绳的墙体试件滞回曲线更为饱满，达到破坏荷载时，其等效黏滞阻尼系数在0.16～0.23之间，同时初始刚度较无草绳墙体提升40%，且加载过程中刚度始终高于无草绳墙体。实际应用中，建议内置草绳高度应超过1/2墙高。研究成果可对夯土建筑的抗震设计及应用推广提供参考依据。
- 生土结构 /
- 夯土墙体 /
- 拟静力试验 /
- 抗震性能
Abstract: In order to solve the problem of weak stress at the rammed layer of rammed earth wall, a load-bearing rammed earth wall reinforced by built-in grass rope is proposed. Taking the grass rope content and embedded height as variables, in order to explore the seismic performance of the wall, such as failure mode, bearing capacity, deformation capacity, energy dissipation capacity and stiffness degradation, a quasi-static test was carried out on four rammed earth walls with scale ratio being 1/3. The test results show that the built-in grass rope can improve the adhesion between the rammed layers of the wall, delay the development and penetration of the horizontal cracks at the rammed layers, and thus improve the integrity of the wall; In addition, the bearing capacity and deformation capacity of the wall are improved, and the lifting rate is positively correlated with the height of the grass rope, which is increased by 108.3% and 35.6% respectively; The hysteresis curve of the wall specimen with built-in grass rope is fuller than that of the wall specimen without grass rope. When the failure load is reached, the equivalent viscous damping coefficient is between 0.16 and 0.23, and the initial stiffness is 40% higher than that of the wall without grass rope. In practical applications, it is recommended that the height of the built-in grass rope should exceed 1/2 wall height. The research results can provide reference for seismic design and application of rammed earth buildings.
- Raw soil structure /
- Rammed earth wall /
- Quasi-static test /
- Seismic performance

HTML全文

图 1 W4试件尺寸（单位：毫米）

Figure 1. W4 specimen size（Unit：mm）

下载: 全尺寸图片幻灯片

图 2 夯土墙试件

Figure 2. Rammed soil wall specimens

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图 3 试验装置及加载制度

Figure 3. Test device and loading diagram

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图 4 各试件破坏图

Figure 4. Failure diagram of each specimen

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图 5 各试件滞回曲线

Figure 5. Hysteresis curves of each specimen

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图 6 各试件骨架曲线图

Figure 6. Skeleton curves of specimens

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图 7 各试件刚度退化曲线

Figure 7. Stiffness degradation curves of specimens

下载: 全尺寸图片幻灯片

表 1 试件方案设计表

Table 1. Sample scheme design table

试件编号	生土掺料	草绳高度/mm	草绳/ 墙高
W1	0.8%麦秸秆	无	无
W2	0.8%麦秸秆	300	1/4
W3	0.8%麦秸秆	600	1/2
W4	0.8%麦秸秆	900	3/4

下载: 导出CSV

表 2 各试件特征点处力学性能参数

Table 2. Mechanical property parameters at characteristic points of each specimen

试件编号	屈服位移 /mm	屈服荷载 /kN	峰值位移 /mm	峰值荷载 /kN	极限位移 /mm	极限荷载 /kN	延性系数
W1	3.73	9.20	5.02	10.10	9.50	8.40	2.27
W2	3.90	13.80	7.90	17.70	11.10	11.20	2.80
W3	3.88	17.37	7.04	19.51	12.76	16.42	3.28
W4	3.92	17.40	6.12	21.04	12.89	17.58	3.28

下载: 导出CSV

表 3 特征点处等效黏滞阻尼系数

Table 3. Equivalent viscous damping coefficient at characteristic points

试件编号	开裂荷载阻尼系数	屈服荷载阻尼系数	极限荷载阻尼系数	破坏荷载阻尼系数
W1	0.0744	0.0865	0.0982	0.1145
W2	0.0811	0.1125	0.1410	0.1687
W3	0.0902	0.1236	0.1665	0.2058
W4	0.0948	0.1358	0.1796	0.2243

下载: 导出CSV

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