地震研究

黏弹阻尼层设计参数对阻尼填充墙框架抗震性能的影响分析^*

(广州大学土木工程学院,广东广州 510006)

Analysis on Influence of Different Design Parameters of Viscoelastic Damping Layer on Seismic Behavior of Damped Infill Wall Frame

LIAO Yi-fa,GUO Yang-zhao,YANG Guan-nan,ZHOU Yun

(School of Civil Engineering,Guangzhou University,Guangzhou 510006,Guangdong,China)

Keywords：damping filled wall; frame structure; viscoelastic damping layer; seismic behavior

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参考文献

设计3组黏弹阻尼层设计参数不同的DIWF模型,采用ABAQUS软件对各个模型进行水平循环荷载作用下的反应分析,研究黏弹阻尼层储能剪切模量、厚度和损耗因子对DIWF的滞回性能、承载能力、刚度特性和耗能能力等性能的影响。结果表明:(1)随着黏弹阻尼层储能剪切模量的增大,DIWF的抗侧刚度和水平承载能力有所提高,但黏弹阻尼层的储能剪切模量过大时,黏弹阻尼层的剪切变形很小,DIWF的耗能能力明显降低,而且墙体容易发生破坏。建议黏弹阻尼层的储能剪切模量不宜大于0.3 MPa;(2)随着黏弹阻尼层厚度的增大,DIWF的抗侧刚度、水平承载力和耗能能力均呈下降趋势,适当减小黏弹阻尼层的厚度,有助于提高结构的滞回耗能性能,还可减少黏弹材料的用量,降低工程造价,但过薄的黏弹阻尼层不能满足剪切变形要求。黏弹阻尼层的厚度宜控制在5～15 mm之间;(3)黏弹阻尼层损耗因子的变化主要影响DIWF的耗能性能,黏弹阻尼层的损耗因子越大,DIWF的耗能能力越强。设计时,应选择损耗因子大的黏弹材料制作黏弹阻尼层。

Three groups of DIWF models with different design parameters of viscoelastic damping layer(VDL)are designed and are applied to analyze their responses under the cyclic load by ABAQUS software. The influence law of different storage shear modulus,thickness and loss factor of VDL on the hysteretic behavior,bearing capacity,stiffness characteristics and energy dissipation capacity of DIWF are also researched. The results reveal that:(1)With the increasing the storage shear modulus of VDL,the lateral stiffness and the horizontal carrying capacity of DIWF increases. However the storage modulus of VDL is oversize,the shear deformation of it is tiny and the energy dissipation ability of DIWF is poor,and the wall is likely damage. The values of shear modulus should not be greater than 0.3 MPa.(2)The thickness of VDL increases,the lateral stiffness,horizontal lateral force and the energy consumption ability of DIWF are downgrade. Appropriately reducing the thickness of layer could not only improve the hysteretic energy dissipation performance of structure,but also reduce the amount of viscoelastic material and the project cost. But a thin VDL could not meet the requirement of the shear deformation,so the optimal thickness of layer is controlled from 5 mm to 15 mm.(3)Variation of the loss factor of VDL mainly affects the energy dissipation performance of DIWF,the larger the loss factor,the greater energy dissipation ability of the DIWF. When design the VDL,the greater loss factor of viscoelastic material should be chose.

引言
1 模型设计
2 有限元模型的建立与验证
3 结果分析
4 结论与建议

图1 DIWF构造示意图<br/>Fig.1 Construction schematic of DIWF

图1 DIWF构造示意图
Fig.1 Construction schematic of DIWF

图2 梁柱截面及配筋<br/>Fig.2 Cross-section and reinforcement of beam and column

图2 梁柱截面及配筋
Fig.2 Cross-section and reinforcement of beam and column

表1 黏弹阻尼层G1、t及η的取值情况<br/>Tab.1 Values of G1,t and η of viscoelastic damped layer

表1 黏弹阻尼层G1、t及η的取值情况
Tab.1 Values of G1,t and η of viscoelastic damped layer

图3 Kelvin模型
Fig.3 Model of Kelvin

图4 计算模拟结果与试验结果对比<br/>(a)BF滞回曲线;(b)BF骨架曲线;(c)DIWF滞回曲线;(d)DIWF骨架曲线<br/>Fig.4 Comparison of numerical simulation and test results(a)hysteretic curve of BF;(b)skeleton curve of BF;(c)hysteretic curve of DIWF;(d)skeleton curve of DIWF

图4 计算模拟结果与试验结果对比
(a)BF滞回曲线;(b)BF骨架曲线;(c)DIWF滞回曲线;(d)DIWF骨架曲线
Fig.4 Comparison of numerical simulation and test results(a)hysteretic curve of BF;(b)skeleton curve of BF;(c)hysteretic curve of DIWF;(d)skeleton curve of DIWF

图5 第Ⅰ组DIWF模型的滞回曲线(t=10 mm,η=0.25)<br/>(a)D1(G1=0.1 MPa);(b)D2(d1=0.2 MPa);(c)D3(G1=0.3 MPa);(d)D4(G1=0.4 MPa); <br/>(e)D5(G1=0.6 MPa);(f)D6(G1=1.0 MPa)<br/>Fig.5 Hysteretic curves of DIWF model in group Ⅰ(t=10 mm,η=0.25)

图5 第Ⅰ组DIWF模型的滞回曲线(t=10 mm,η=0.25)
(a)D1(G1=0.1 MPa);(b)D2(d1=0.2 MPa);(c)D3(G1=0.3 MPa);(d)D4(G1=0.4 MPa);
(e)D5(G1=0.6 MPa);(f)D6(G1=1.0 MPa)
Fig.5 Hysteretic curves of DIWF model in group Ⅰ(t=10 mm,η=0.25)

图6 第Ⅰ组DIWF模型的骨架曲线<br/>Fig.6 Skeleton curve of DIWF model in group Ⅰ

图6 第Ⅰ组DIWF模型的骨架曲线
Fig.6 Skeleton curve of DIWF model in group Ⅰ

图7 第Ⅰ组DWIF模型的等效黏滞阻尼系数(a)、剪切变形(b)、耗能量(c)变化曲线<br/>Fig.7 Variation curve of equivalent viscoelastic damping coefficient(a),shear deformation(b)and energy-dissiptated(c)of DWIF model in group Ⅰ

图7 第Ⅰ组DWIF模型的等效黏滞阻尼系数(a)、剪切变形(b)、耗能量(c)变化曲线
Fig.7 Variation curve of equivalent viscoelastic damping coefficient(a),shear deformation(b)and energy-dissiptated(c)of DWIF model in group Ⅰ

图8 阻尼填充墙mises应力分布<br/>Fig.8 Mises stress distribution of DIW

图8 阻尼填充墙mises应力分布
Fig.8 Mises stress distribution of DIW

图9 第Ⅰ组DWIF模型mises应力变化曲线<br/>Fig.9 Variation curve of mises stress of DWIF model in group Ⅰ

图9 第Ⅰ组DWIF模型mises应力变化曲线
Fig.9 Variation curve of mises stress of DWIF model in group Ⅰ

图10 第Ⅱ组D7(a)、D10(b)和D12(c)模型的滞回曲线(G1=0.1 MPa,η=0.25)<br/>Fig.10 Hysteretic curves of D7(a),D10(b)and D12(c )models in group Ⅱ(G1=0.1 MPa,η=0.25)

图10 第Ⅱ组D7(a)、D10(b)和D12(c)模型的滞回曲线(G1=0.1 MPa,η=0.25)
Fig.10 Hysteretic curves of D7(a),D10(b)and D12(c )models in group Ⅱ(G1=0.1 MPa,η=0.25)

图11 第Ⅱ组DIWF模型的骨架曲线<br/>Fig.11 Skeleton curve of DIWF model in group Ⅱ

图11 第Ⅱ组DIWF模型的骨架曲线
Fig.11 Skeleton curve of DIWF model in group Ⅱ

图12 第Ⅱ组DIWF模型的等效黏滞阻尼系数(a),剪应变幅值(b),耗能量(c)变化曲线<br/>Fig.12 Variation curve of equivalent viscoelastic damping coefficient(a),shear deformation amplitude(b)and energy-dissiptated(c)of DIWF model in group Ⅱ

图12 第Ⅱ组DIWF模型的等效黏滞阻尼系数(a),剪应变幅值(b),耗能量(c)变化曲线
Fig.12 Variation curve of equivalent viscoelastic damping coefficient(a),shear deformation amplitude(b)and energy-dissiptated(c)of DIWF model in group Ⅱ