考虑地层约束效应的预制侧墙节点抗震性能试验

doi:10.13229/j.cnki.jdxbgxb.20220858

摘要/Abstract

摘要：

由于地下结构体系存在地层-结构相互作用的问题，常规的拟静力试验方法无法准确模拟地下装配式结构的受力特征。为此，本文提出了一种考虑地层约束效应影响的拟静力试验方法。研究了地层约束效应对榫卯连接预制侧墙试件及现浇侧墙试件的破坏模式、承载能力及耗能能力的影响。试验结果表明，土体约束效应的存在提高了预制侧墙试件的承载能力及耗能能力，但增大了节点区域混凝土的塑性损伤程度，这一结论在榫卯连接预制侧墙试件中体现得最明显。同时，本文提出了能够反映榫卯连接预制侧墙试件抗震性能的数值模型，结果表明，土体约束荷载对榫卯节点的承载力影响较大，但未显著改善榫卯节点的耗能能力。

关键词: 岩土工程, 预制侧墙结构, 地层约束效应, 试验研究, 数值模拟, 抗震性能

Abstract:

The conventional quasi-static test methods cannot accurately simulate the force characteristics of underground assembled structures due to the strata-structure interaction problem of underground structural systems. Therefore， a pseudo-static test method considering strata constraint effect is proposed， called strata restraint-pseudo-static method. The effects of strata restraint effect on the damage mode， load carrying capacity and energy dissipation capacity of prefabricated sidewall specimens with mortise-tenon joints （MTWJ）， and cast-in-place sidewall （CWJ） specimens were investigated. The test results show that the presence of the strata restraint effect improves the load-bearing capacity and energy dissipation of the prefabricated sidewall specimens， but aggravates concrete plastic damage， which is most evident in prefabricated sidewall specimens with mortise-tenon joints. The numerical model that can respond to the seismic performance of MTWJ specimens is proposed， and the results show that the strata restraint load has a large effect on the bearing capacity， but it is not significant to improve the energy dissipation capacity of the mortise-tenon joint.

Key words: geotechnical engineering, prefabricated sidewall structure, strata restraint effect, experimental study, numerical simulation, seismic performance

中图分类号:

U451

何华飞,李兆平,符瑞安,马绍麟,黄明利. 考虑地层约束效应的预制侧墙节点抗震性能试验[J]. 吉林大学学报(工学版), 2024, 54(6): 1601-1611.

Hua-fei HE,Zhao-ping LI,Rui-an FU,Shao-lin MA,Ming-li HUANG. Experiment on seismic performance of prefabricated sidewall joints considering strata restraint effect[J]. Journal of Jilin University(Engineering and Technology Edition), 2024, 54(6): 1601-1611.

图/表 19

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图5

图6

表1

图7

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图9

图10

图11

表2

混凝土构件承载力试验结果"

试件编号	加载方向	屈服点		峰值点		极限点		延性系数 $μ = Δ u / Δ y$
试件编号	加载方向	位移/mm	荷载/kN	位移/mm	荷载/kN	位移/mm	荷载/kN	延性系数 $μ = Δ u / Δ y$
CWJ	正向	33.83	611.27	52.03	682.71	56.09	580.30	1.66
CWJ	负向	-35.91	-702.53	-51.99	-802.68	-55.74	-682.28	1.55
MTWJ	正向	19.44	232.62	50.55	330.95	55.63	281.31	2.86
MTWJ	负向	-30.84	-444.03	-55.18	-526.69	-59.55	-447.69	1.93

表2

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图14

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图16

图17

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类型	强度/MPa	强度/MPa
混凝土	55.1（抗压）	2.9（抗拉）
钢筋	447（屈服）	645（极限）

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