Seismic Performance of Hoop Head Tenon Timber Joint with Added Corner Dampers

doi:10.12141/j.issn.1000-565X.230658

Abstract

Abstract:

To provide theoretical basis for the restoration of Guangfu wooden structures, five hoop head tenon joint specimens were designed and manufactured using Merbau wood. Considering the influence of the size of mortise and tenon construction, quasi-static tests were carried out on undamaged and unreinforced joint specimens. Then, to preserve the original appearance of the building as much as possible, the damaged joint specimens mentioned above were reinforced by the Queti-type dampers that have minimal influence on the original appearance of the structure. Finally, quasi-static tests were conducted again on the reinforced joints to investigate the difference in their seismic performance and the strengthening effect of the dampers. The results show that the joint specimens reinforced with dampers exhibit significant indentations at the mortise and tenon connections when being loaded to failure. There is noticeable splitting on the outer side of the tenon of the beam and the detachment of the tenon, as well as obvious separation between the rubber and steel plate at the base of the damper. The addition of dampers to joints can compensate the decrease in force-bearing performance caused by initial damage, provide better post-damage stiffness for the damaged mortise and tenon joints, and enhance the ultimate load-bearing capacity and energy absorption capacity. After adding the damper, there occur enhancements in terms of post-damage stiffness, load-bearing capacity and energy absorption of specimens, as compared with the unreinforced joints, with the increment being more than 18%, 19% and 20%, respectively. Moreover, on the basis of the existing simplified mechanical model and in combination with OpenSees, a macro-modelling method was proposed for hoop head tenon timber structures, which helps to obtain hysteresis curves of the joints being in good agreement with the experimental results, meaning that the modelling method can effectively simulate the hysteresis energy dissipation characteristics of the hoop head tenon joints strengthened with dampers.

Key words: timber structure, hoop head tenon joint, joint strengthening, damper, seismic performance

CLC Number:

TU318

CHEN Qingjun, LEI Jun, LI Bingzhou, ZUO Zhiliang, CAI Jian. Seismic Performance of Hoop Head Tenon Timber Joint with Added Corner Dampers[J]. Journal of South China University of Technology(Natural Science Edition), 2024, 52(7): 119-134.

Figures/Tables 29

Fig.1

Fig.2

Fig.3

Table 1

Table 2

Physical and mechanical properties of Merbau wood"

参数	取值		取值		取值
$f L t$	126.90	$E R c$	1 764.5	$μ L R$	0.371
$f L c$	47.10	$E T c$	909.3	$μ L T$	0.467
$f R c$	10.50	$E L m$	34 428.8	$μ R T$	0.703
$f T c$	9.43	$G L R$	806.24	$μ T R$	0.333
$f L m$	98.20	$G L T$	644.99	$μ R L$	0.050
$E L c$	10 749.8	$G R T$	193.50	$μ T L$	0.031

Table 2

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

Fig.11

Fig.12

Fig.13

Fig.14

Fig.15

Table 3

Fig.16

Fig.17

Fig.18

Table 4

Fig.19

Table 5

Fig.20

Table 6

Fig.21

Fig.22

Fig.23

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试件	h/mm	D/mm	t
JS1（RJS1）	130	150	0.4D
JS2（RJS2）	130	130	0.4D
JS3（RJS3）	130	170	0.4D
JS4（RJS4）	130	150	0.3D
JS5（RJS5）	130	150	0.5D

试件序号	总滞回耗能/（kN∙mm）		提高率/%
试件序号	未加固试件	加固后试件	提高率/%
1	1 674.34	2 313.59	38.18
2	1 946.50	2 425.80	24.62
3	3 426.08	3 560.45	3.92
4	1 762.80	2 276.84	29.16
5	1 450.73	1 848.14	27.39

参数	取值		取值		取值
rDispP	0.10	fFoceP	0.00	uForceP	-0.01
rDispN	0.10	fFoceN	0.00	uForceN	-0.01
gK₁	-0.1	gD₁	0.05	gF₁	0.0
gK₂	-0.1	gD₂	0.05	gF₂	0.0
gK₃	-0.1	gD₃	0.05	gF₃	0.0
gK₄	-0.1	gD₄	0.05	gF₄	0.0
gK_Lim	-0.1	gD_Lim	0.05	gF_Lim	0.0
gE	10 000

未加固试件	epsP	epsN		epsP	epsN
JS1	0.004	0.007	RJS1	0.012 2	0.018 2
JS2	0.000	0.000	RJS2	0.142 0	0.142 0
JS3	0.000	0.000	RJS3	0.004 2	0.012 2
JS4	0.000	0.000	RJS4	0.002 2	0.012 2
JS5	0.000	0.002	RJS5	0.006 2	0.008 2

参数	取值		取值		取值
alpha	0.055	Ao	1	deltaShi	0.01
ko	7 500	q	0.86	lambda	0.48
n	1	zetas	0.69	tol	0.001
gamma	0.05	p	39.1	maxlter	1 000
beta	0.95	Shi	2.31