基于改进Bouc-Wen模型的RC柱数值模拟方法

doi:10.13229/j.cnki.jdxbgxb.20220670

Abstract

Abstract:

In order to simulate the mechanical properties of reinforced concrete（RC） columns within nonlinear state， In this paper， an modified Bouc-Wen model is proposed to improve the Bouc-Wen-Baber-Noori （BWBN） model from the aspects of stiffness degradation， pinching effect and asymmetric characteristics. In the meantime， an identification method of model parameters is established by combining parameter normalization processing and chaotic particle swarm optimization algorithm. Furthermore， secondary development for modified Bouc-Wen material is presented in OpenSees. Afterwards， the proposed material is applied to describe the moment-rotation relationship of plastic hinge of RC columns and numerical modeling of RC columns based on concentrated plastic hinge is completed. According to the low-cyclic loading test data of RC columns， the hysteretic characteristics of RC columns are described by directly identifying the horizontal force-displacement curve and numerical modeling based on lumped plastic hinge model. The results show that the accuracy of the modified Bouc-Wen model is significantly higher than that of BWBN model. The calculation accuracy of fiber model depends on the accuracy of components information， which fails to simulate the nonlinear response of RC columns after performance change. The numerical modeling method based on the modified Bouc-Wen model can rationally simulate the degradation， pinching effect and asymmetric characteristics of RC columns after earthquake damage.

Key words: RC column, lumped plastic hinge model, Bouc-Wen model, parameter identification

CLC Number:

TU375.3

Yu-rong GUO,Jian-zhong PAN. Numerical simulation method for reinforced concrete columns based on modified Bouc-Wen model[J].Journal of Jilin University(Engineering and Technology Edition), 2024, 54(4): 1028-1037.

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	编号	参数	物理意义
形状控制	1	k	规一化线性刚度
	2	α	屈服后刚度比
	3	β	加卸载滞回参数
	4	γ	加卸载滞回参数
	5	n	弹塑性过渡段参数
	6	v	非对称参数
退化控制	7	δ_ν	强度退化速率
	8	δ_η	刚度退化速率
	9	ξ_η	刚度退化速率控制系数
捏拢控制	10	σ	捏拢效应影响范围
	11	ρ	捏拢处总滑移量
	12	u	捏拢处刚度退化速率

编号	边界形式	L/mm	B/mm	H/mm	N₀ /kN	f_c /MPa	f_yl /MPa	f_yh /MPa	ρ_l /%	ρ_t_/%
C1	悬臂式	750	200	200	256	30.1	481	463	1.21	1.44
C2	双曲率式	3 600	600	600	3 069	35.1	413	416	1.64	1.13

构件	RMSE/%		累积耗能/（kN·m）
构件	BWBN	改进Bouc-Wen	试验值	BWBN	识别/试验	改进Bouc-Wen	识别/试验
C1	21.98	18.58	20.60	21.81	1.06	20.49	0.99
C2	17.09	10.38	1 050.36	923.66	0.91	974.01	0.96

	参数	C1	C2
等效屈服点	θ_y /rad	0.005 4	0.019 9
等效屈服点	M_y /（kN·m）	27.94	745.19
改进Bouc-Wen模型参数	k	1.322	2.135
	α	0.394	0.460
	β	-0.318	-0.230
	γ	0.025	0.002
	n	1.766	1.504
	v	0.923	0.987
	δ_ν	0.036	0.046
	δ_η	0.023	0.054
	ξ_η	2.313	4.043
	σ	11.991	9.938
	ρ	0.540	0.495

构件	RMSE/%		累积耗能/（kN·m）
构件	纤维模型	改进Bouc-Wen模型	试验值	纤维模型	识别/试验	改进Bouc-Wen模型	识别/试验
C1	23.58	19.86	20.60	22.93	1.11	19.97	0.97
C2	53.31	11.78	507.67	816.41	1.61	497.94	0.98

Numerical simulation method for reinforced concrete columns based on modified Bouc-Wen model

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