梭形双重约束防屈曲支撑的整体稳定性设计方法

doi:10.13229/j.cnki.jdxbgxb.20240417

Abstract

Abstract:

To study the global stability and design method of a novel shuttle-shaped double-restrained buckling-restrained brace （SDR-BRB）， this article first uses the equilibrium method to derive the calculation formula for the elastic buckling load and the restraining ratio of SDR-BRB with hinged ends. Then， the distribution function of lateral deformation and bending moment of SDR-BRB is constructed considering the influence of global initial geometric imperfections， and based on the yielding criteria of the outmost fiber for the restraining member section， the calculation formula of the three types of the restraining ratio requirement of SDR-BRB is obtained. On this basis， the ABAQUS finite element model verified by experiments is established， and the elastic-plastic finite element numerical analysis of its load-carrying capacity under monotonic loading and hysteretic performance under cyclic loading is carried out respectively. Finally， the global stability design method of SDR-BRB based on the restraining ratio requirement is proposed. The results show that the restraining ratio has a significant effect on the global stability， load-carrying capacity， and hysteretic performance of SDR-BRB. Based on the three types of the restraining ratio requirement， SDR-BRB can be divided into delayed buckling member， load-carrying BRB， and energy-consuming BRB. The design method proposed in this article can accurately predict the buckling behavior of the load-carrying capacity and hysteretic performance of SDR-BRB， and has good applicability， which can be used as the global stability design criterion of SDR-BRB.

Key words: structural reinforcement, shuttle-shaped double-restrained buckling-restrained brace, global stability, restraining ratio requirement, load-carrying capacity, hysteretic performance

CLC Number:

U442.5

Jun SHI,Lue-qin XU,Shuang-shuang JIN,Hong-tao HE,Jian-ting ZHOU,Yang-qing LIU. Global stability design method of shuttle-shaped double-restrained buckling-restrained brace[J].Journal of Jilin University(Engineering and Technology Edition), 2025, 55(11): 3521-3533.

Figures/Tables 16

Fig.1

Fig.2

Table 1

Fig.3

Fig.4

Fig.5

Fig.6

Table 2

Geometric sizes of numerical examples of SDR-BRB under axial monotonic load"

编号	l	d₁×t₁	d₂×t₂	γ	ζ	$ζ / ζ 1$	$ζ / ζ 2$	类型
SDR-10-ζ	10 000	120×20	140×8	0.20~0.36	0.81~1.13	0.67~0.97	0.32~0.49	失稳
	10 000	120×20	140×8	0.41~0.68	1.24~2.02	1.08~1.83	0.55~0.97	失稳
	10 000	120×20	140×8	0.72~0.87	2.15~2.72	1.96~2.52	1.04~1.35	稳定
SDR-15-ζ	15 000	150×25	180×13	0.38~0.53	0.84~1.11	0.72~0.97	0.36~0.50	失稳
	15 000	150×25	180×13	0.61~0.90	1.27~2.02	1.13~1.85	0.59~0.99	失稳
	15 000	150×25	180×13	0.93~1.09	2.11~2.64	1.94~2.46	1.04~1.33	稳定
SDR-20-ζ	20 000	200×30	240×18	0.26~0.38	0.87~1.11	0.75~0.98	0.38~0.50	失稳
	20 000	200×30	240×18	0.44~0.70	1.24~1.96	1.11~1.80	0.58~0.96	失稳
	20 000	200×30	240×18	0.74~0.90	2.09~2.67	1.93~2.50	1.03~1.36	稳定
SDR-25-ζ	25 000	250×35	300×23	0.17~0.29	0.85~1.10	0.74~0.97	0.37~0.50	失稳
	25 000	250×35	300×23	0.34~0.59	1.21~1.93	1.08~1.78	0.56~0.95	失稳
	25 000	250×35	300×23	0.64~0.79	2.10~2.68	1.94~2.51	1.05~1.37	稳定

Table 2

Fig.7

Fig.8

Fig.9

Table 3

Geometric sizes of numerical examples of SDR-BRB under axial cyclic load"

编号	l	d₁×t₁	d₂×t₂	γ	ζ	$ζ / ζ 2$	$ζ / ζ 3$	类型
SDR-10-ζ	10 000	120×20	140×8	0.32~0.67	1.04~1.98	0.44~0.95	0.37~0.81	失稳
	10 000	120×20	140×8	0.71~0.78	2.12~2.35	1.02~1.15	0.87~0.99	失稳
	10 000	120×20	140×8	0.81~0.96	2.48~3.11	1.22~1.56	1.05~1.36	稳定
SDR-15-ζ	15 000	150×25	180×13	0.47~0.87	1.00~1.93	0.44~0.94	0.37~0.81	失稳
	15 000	150×25	180×13	0.92~0.99	2.08~2.30	1.02~1.14	0.88~0.99	失稳
	15 000	150×25	180×13	1.04~1.21	2.46~3.09	1.23~1.57	1.07~1.37	稳定
SDR-20-ζ	20 000	200×30	240×18	0.32~0.69	0.99~1.93	0.44~0.94	0.37~0.81	失稳
	20 000	200×30	240×18	0.73~0.79	2.05~2.26	1.02~1.13	0.88~0.98	失稳
	20 000	200×30	240×18	0.85~0.99	2.48~3.05	1.25~1.56	1.08~1.36	稳定
SDR-25-ζ	25 000	250×35	300×23	0.23~0.59	0.97~1.93	0.43~0.95	0.36~0.82	失稳
	25 000	250×35	300×23	0.63~0.69	2.06~2.28	1.03~1.15	0.89~0.99	失稳
	25 000	250×35	300×23	0.74~0.87	2.48~3.03	1.25~1.56	1.09~1.36	稳定

Table 3

Fig.10

Fig.11

Fig.12

Fig.13

References 20

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编号	l	d₁×t₁	d₂×t₂	d_e1	d_e2	γ	l₁	λ	t_e	ζ
1	10 000	120×20	140×8	200	300	0.5	5 000	0.5	12	1.47
2	20 000	200×30	240×18	350	525	0.5	10 000	0.5	21	1.39
3	30 000	300×40	350×23	500	750	0.5	15 000	0.5	30	1.27