Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (6): 1601-1611.doi: 10.13229/j.cnki.jdxbgxb.20220858

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Experiment on seismic performance of prefabricated sidewall joints considering strata restraint effect

Hua-fei HE1(),Zhao-ping LI1(),Rui-an FU2,Shao-lin MA1,Ming-li HUANG1   

  1. 1.School of Civil Engineering，Beijing Jiaotong University，Beijing 100044，China
    2.China Railway Siyuan Survey and Design Group Co. ，Ltd. ，Wuhan 430063，China
  • Received:2022-07-05 Online:2024-06-01 Published:2024-07-23
  • Contact: Zhao-ping LI E-mail:19115020@bjtu.edu.cn;zhpli@bjtu.edu.cn

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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

CLC Number: 

  • U451

Fig.1

Relationship between underground structure and strata effect"

Fig.2

Mechanical model of pseudo-static method"

Fig.3

Mechanical model of strata restraint-pseudo-static method"

Fig.4

Model for horizontal foundation spring coefficient of response displacement method"

Fig.5

MTWJ specimen and strain gauge arrangement （unit： mm）"

Fig.6

CWJ specimen and strain gauge arrangement （unit： mm）"

Table 1

Strength testing of concrete and reinforcement materials"

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）

Fig.7

Test setup"

Fig.8

Loading schedule for displacements and soil loads"

Fig.9

Cracks development and failure mode of CWJ specimen"

Fig.10

Damage state and crack distribution of MTWJ specimen"

Fig.11

Skeleton curve of test specimens"

Table 2

Test results of bearing capacity"

试件编号加载方向屈服点峰值点极限点

延性系数

μ=Δu/Δy

位移/mm荷载/kN位移/mm荷载/kN位移/mm荷载/kN
CWJ正向33.83611.2752.03682.7156.09580.301.66
负向-35.91-702.53-51.99-802.68-55.74-682.281.55
MTWJ正向19.44232.6250.55330.9555.63281.312.86
负向-30.84-444.03-55.18-526.69-59.55-447.691.93

Fig.12

Hysteresis loops of sidewall specimens at peak point position"

Fig.13

Contact relationship and finite element model of mortise-tenon joint"

Fig.14

Constraint relationship of the specimens"

Fig.15

Comparison of finite element simulation results and experimental data"

Fig.16

Effect of axial pressure ratio on load capacity and energy dissipation capacity"

Fig.17

Effect of soil restraint load on load capacity and energy dissipation capacity"

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