输电塔斜材T型加固理论分析及试验研究

吴海楠; 谢强; 李悦; 吴明儿; 闫聪

doi:10.3969/j.issn.0258-2724.20240435

输电塔斜材T型加固理论分析及试验研究

doi: 10.3969/j.issn.0258-2724.20240435

吴海楠^1,,
谢强^{1, 1, ,},
李悦²,
吴明儿¹,
闫聪¹

1.
同济大学土木工程学院，上海，200092
2.
中国核工业华兴建设有限公司，南京，200019

基金项目: 国家自然科学基金项目（52278523）

详细信息

作者简介:
吴海楠（1995—），男，博士研究生，研究方向为输电线路防灾减灾，E-mail：2210036@tongji.edu.cn

通讯作者:
谢强（1971—），男，教授，博士，研究方向为电网基础设施的智能化防灾减灾与运维，E-mail：qxie@tongji.edu.cn

中图分类号: TM753；TM726.3
计量
- 文章访问数: 53
- HTML全文浏览量: 64
- PDF下载量: 6
- 被引次数: 0
出版历程
- 收稿日期: 2024-09-03
- 录用日期: 2024-12-30
- 修回日期: 2024-10-02
- 网络出版日期: 2025-01-13

Theoretical Analysis and Experimental Study of T-Shaped Retrofitting Schemes of Diagonal Members for Transmission Towers

WU Hainan^1
,,
XIE Qiang^{1, 1
, ,},
LI Yue²,
WU Minger¹,
YAN Cong¹

1.
College of Civil Engineering, Tongji University, Shanghai 200092, China
2.
China Nuclear Industry Huaxing Construction Co., Ltd., Nanjing 200019, China

摘要

摘要:
为优化T型加固斜材构件的加固方案，通过理论分析、试验研究和有限元分析研究构件的结构和材料参数对加固后承载力的影响. 首先，基于组合梁理论，建立T型加固截面的理论模型，进而分析T型加固的抗弯刚度提高程度；其次，进行单面连接角钢T型加固的偏心受压静力试验；最后，通过有限元模型分析长细比、宽厚比和材料强度对夹具数目选择的影响. 研究结果表明：T型加固的抗弯刚度提高程度随着荷载的增大而减小；夹具数目减小会导致垂直于构件变形方向的相对滑移；针对试验构件，夹具数目越多承载力越大，最大加固效果为100.4%；针对斜材的T型加固方案，长细比低于150时选用2个夹具即可，反之，则需要3个夹具；宽厚比和材料强度不会对夹具的选择造成影响.
- 单面连接斜材 /
- T型加固 /
- 加固方案 /
- 组合梁理论 /
- 静力试验 /
- 参数分析
Abstract:
To optimize the T-shaped retrofitting scheme of diagonal members, the influence of structural and material parameters on the bearing capacity of the members after retrofitting was investigated through theoretical analysis, experimental study, and finite element analysis. Firstly, a theoretical model of the T-shaped retrofitting section was established based on the composite beam theory, so as to analyze the improvement in flexural stiffness after T-shaped retrofitting. Secondly, eccentric compression static experiments of single-side connected angle steels for T-shaped retrofitting were conducted. Finally, the finite element model was used to analyze the effects of the slenderness ratio, width-to-thickness ratio, and material strength on the selection of the number of connectors. The results indicate that the improvement in flexural stiffness after T-shaped retrofitting decreases with increasing load. A decrease in the number of connectors leads to relative slip perpendicular to the direction of member deformation. For the experimental members, an increase in the number of connectors leads to greater bearing capacity, with a maximum retrofitting effect of 100.4%. For the T-shaped retrofitting scheme of diagonal members, two connectors are sufficient when the slenderness ratio is below 150. Otherwise, three connectors are required. The width-to-thickness ratio and material strength have no effect on the selection of connectors.
- single-side connected diagonal member /
- T-shaped retrofitting scheme /
- retrofitting scheme /
- composite beam theory /
- static experiment /
- parameter analysis

HTML全文

图 1 T型加固角钢截面

Figure 1. Angle steel section after T-shaped retrofitting

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图 2 隔离体平衡条件

Figure 2. Equilibrium conditions of separating element

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图 3 轴向和横向力作用下接触面的相对滑移

Figure 3. Relative slip of contact surface under axial and transversal forces

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图 4 抗弯刚度提高系数随K_s的变化

Figure 4. Variation of flexural stiffness improvement coefficient with K_s

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图 5 试验装置及测点布置

Figure 5. Experimental setup and monitoring point arrangement

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图 6 原构件和加固构件的破坏模式

Figure 6. Failure modes of original members and members after retrofitting

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图 7 加固前后水平位移对比

Figure 7. Comparison of transversal displacements before and after retrofitting

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图 8 主轴和最小轴水平位移对比

Figure 8. Comparison of transversal displacements in primary and minimum axes

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图 9 加固前、后连接肢应变对比

Figure 9. Comparison of strains in connected leg before and after retrofitting

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图 10 加固前、后连接肢应变差对比

Figure 10. Comparison of strain differences in connected leg before and after retrofitting

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图 11 加固前、后非连接肢应变对比

Figure 11. Comparison of strains in unconnected leg before and after retrofitting

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图 12 附加角钢应变对比

Figure 12. Comparison of strains in additional angle steel

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图 13 T型加固角钢构件有限元模型

Figure 13. Finite element model of angle steel members after T-shaped retrofitting

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图 14 有限元结果与试验对比

Figure 14. Comparison of finite element results and experimental results

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图 15 不同长细比下夹具数目对承载力的影响

Figure 15. Effect of number of connectors on bearing capacity under different slenderness ratios

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图 16 不同宽厚比下夹具数目对承载力的影响

Figure 16. Effect of number of connectors on bearing capacity under different width-to-thickness ratios

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图 17 不同长细比和材料强度下夹具数量对承载力的影响

Figure 17. Effect of number of connectors on bearing capacity under different slenderness ratios and material strengths

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表 1 试件相关参数

Table 1. Related parameters of specimens

构件编号	截面类型	长度/ mm	夹具间距/mm	夹具数目/个	长细比
SPE1	L40 × 4	1480			187.3
SPER2	L40 × 4	1480	1160	2
SPER3	L40 × 4	1480	580	3
SPER5	L40 × 4	1480	290	5

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表 2 试验材料相关参数

Table 2. Related parameters of experimental material

材料	E/GPa	f_y/MPa	f_u/MPa
Q235	212	330.0	481.7

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表 3 加固前后承载力对比

Table 3. Comparison of bearing capacities before and after retrofitting kN

构件编号	F₁₁	F₁₂	F₁₃	平均值	Δ/%
SPE1	17.08	17.83	20.44	18.45
SPER2	28.06	28.57	30.70	29.11	57.8
SPER3	32.39	34.43	36.47	34.43	86.6
SPER5	34.93	36.43	39.55	36.97	100.4

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