Infrastructure / Lead Rubber Bearing

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Lead Rubber Bearing (LRB)

Lead rubber bearing is composed of laminated rubber and lead core. Rubber has the characteristic of low horizontal stiffness, which extends the vibration period of buildings or bridges, thereby decreasing the acceleration of the structures during earthquakes. Lead core provides damping, which absorbs energy induced by seismic waves. Lead rubber bearing combines the above advantages and has experienced many earthquakes, showing good isolation efficiency and reliability.

Description

Specifications

Advantages

Applications

Materials

Dimensions

Specifications

Advantages

Applications

Materials

Dimensions

			LRBR400 -80-100	LRBR500 -80-100	LRBR600 -100-117	LRBR700 -130-140	LRBR800 -150-156	LRBR900 -200-180
Shear modulus	G	N/mm²	0.3946	0.3946	0.3946	0.3946	0.3946	0.4104
Detail dimension
Outer diameter of bearing	D_r	mm	400	500	600	700	800	900
Diameter of lead	D_i	mm	80	80	100	130	150	200
Thickness of rubber layer	t_r	mm	5	5	4.5	5	6	6
No. of rubber layers	—	layer	20	20	26	28	26	30
Total height of rubber	H_r	mm	100	100	117	140	156	180
1st shape factor	S₁	—	20	25	33.33	35	33.33	37.5
2nd shape factor	S₂	—	4	5	5.13	5	5.13	5
Thickness of shim plate	t_s	mm	3	3	4.5	4.5	4.5	4.5
No. of shim plates	—	layer	19	19	25	27	25	29
Thickness of connection plate	t_cp	mm	20	25	25	30	30	30
Rubber bearing height	H_b	mm	197	207	279.5	321.5	328.5	370.5
Anchor plate
Thickness of anchor plate	tf	mm	20	25	25	30	35	38
Total bearing height	H_tot	mm	237	257	329.5	381.5	398.5	446.5
Diameter of anchor plate	D_f	mm	580	700	800	950	1050	1200
Vertical load
Design load at 12 Mpa (120 kg/cm²)	—	kN	1508	2356	3393	4418	6032	7634
Vertical Characteristics
Compressive strength	σ_C	N/mm²	60	60	60	60	60	60
Vertical design stress	σ_normal	N/mm²	12	12	12	12	12	12
Vertical stiffness	K_v	kN/mm	781	1553	2711	3170	3637	4233
Lateral characteristics
Effective stiffness	K_eff	kN/m	1579	1857	1467	1808	2135	2775
Effective damping ratio	H_eq	%	33.6	28.6	23.4	26.8	27.1	32
Elastic stiffness	K_u	kN/m	8938	12285	11123	12567	14720	16547
Post-elastic stiffness	K_d	kN/m	745	1024	927	1047	1227	1379
Characteristic strength	Q_d	kN	40	40	63	106	142	251

			LRBR1000 -220-198	LRBR1100 -220-224	LRBR1200 -100-117	LRBR1300 -130-140	LRBR1400 -150-156	LRBR1500 -200-180
Shear modulus	G	N/mm²	0.4104	0.4104	0.4262	0.4262	0.4262	0.4262
Detail dimension
Outer diameter of bearing	D_r	mm	1000	1100	1200	1300	1400	1500
Diameter of lead	D_i	mm	220	220	270	270	280	300
Thickness of rubber layer	t_r	mm	6	7	8	8	8	8
No. of rubber layers	—	layer	33	32	31	31	31	38
Total height of rubber	H_r	mm	198	224	248	248	248	304
1st shape factor	S₁	—	41.67	39.29	37.5	40.63	43.75	46.88
2nd shape factor	S₂	—	5.05	4.91	4.84	5.24	5.65	4.93
Thickness of shim plate	t_s	mm	4.5	4.5	4.5	2.5	4.5	4.5
No. of shim plates	—	layer	32	31	30	30	30	37
Thickness of connection plate	t_cp	mm	35	44	44	44	50	50
Rubber bearing height	H_b	mm	412	451.5	471	471	483	570.5
Anchor plate
Thickness of anchor plate	tf	mm	40	50	50	50	50	50
Total bearing height	H_tot	mm	492	551.5	571	571	583	670.5
Diameter of anchor plate	D_f	mm	1350	1400	1500	1600	1750	1850
Vertical load
Design load at 12 Mpa (120 kg/cm²)	—	kN	9425	11404	13572	15928	18473	21206
Vertical Characteristics
Compressive strength	σ_C	N/mm²	60	60	60	60	60	60
Vertical design stress	σ_normal	N/mm²	12	12	12	12	12	12
Vertical stiffness	K_v	kN/mm	4991	5275	5550	6805	8155	7825
Lateral characteristics
Effective stiffness	K_eff	kN/m	3085	3029	3694	4032	4528	4240
Effective damping ratio	H_eq	%	31.7	28.5	31.9	29.2	28	27.9
Elastic stiffness	K_u	kN/m	18590	20058	22142	26191	30476	28541
Post-elastic stiffness	K_d	kN/m	1549	1672	1845	2183	2540	2378
Characteristic strength	Q_d	kN	304	304	459	459	493	566

Lead Rubber Bearing (LRB)

Description

References

Mexico - Puebla Highway (2016)

Kaoshiung Port Elevated Road CM1 (2011)

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