起波配筋RC梁抗爆作用机理及抗力动力系数的理论计算方法

樊源; 陈力; 任辉启; 冯鹏; 方秦

doi:10.11883/bzycj-2018-0181

起波配筋RC梁抗爆作用机理及抗力动力系数的理论计算方法

doi: 10.11883/bzycj-2018-0181

樊源^1,,
陈力^{1, 2, ,},
任辉启²,
冯鹏³,
方秦¹

1.
陆军工程大学爆炸冲击防灾减灾国家重点实验室，江苏南京 21007
2.
61489部队，河南洛阳 471023
3.
清华大学土木工程系，北京 100084

基金项目: 国家自然科学基金（51622812, 51427807）；中国博士后科学基金（2017M613379）

详细信息

作者简介:
樊　源（1994－　），男，硕士研究生，fanyuan0@foxmail.com

通讯作者:
陈　力（1982－　），男，博士，教授，博导，chenli1360@qq.com

中图分类号: O383.2
计量
- 文章访问数: 275
- HTML全文浏览量: 106
- PDF下载量: 17
- 被引次数: 0
出版历程
- 收稿日期: 2018-05-28
- 修回日期: 2018-07-26
- 网络出版日期: 2018-07-25
- 刊出日期: 2019-03-01

Blast-resistant mechanism of RC beam with kinked rebar and calculation method of dynamic resistance coefficient

FAN Yuan^1
,,
CHEN Li^{1, 2
, ,},
REN Huiqi²,
FENG Peng³,
FANG Qin¹

1.
State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army Engineering University of PLA, Nanjing 210007, Jiangsu, China
2.
Unit 61489, Luoyang 471023, Henan, China
3.
Department of Civil Engineering, Tsinghua University, Beijing 100084, China

摘要

摘要:
针对钢筋混凝土(RC)梁，提出了一种通过对抗拉纵筋进行局部弯折，形成钢筋起波，从而提高RC梁抗爆能力的高效新方法。结合已有的实验结果和有限元模型计算，分析了起波配筋RC梁的受荷破坏全过程，揭示了其抗爆作用机理。分析结果表明，在RC梁底部适当位置设置纵筋起波，能增大RC梁在爆炸荷载作用下的允许变形，有效吸收爆炸能量，大幅度提高RC梁的抗爆性能。基于能量法，建立了起波配筋RC梁在爆炸荷载作用下的理论计算模型，给出了抗力动力系数的显示计算公式；讨论了平屈抗力比、平弹变形比以及屈弹变形比3个关键设计参数对起波配筋RC梁抗爆性能的影响规律，以便为进一步工程应用提供理论依据。
- 起波配筋 /
- 钢筋混凝土梁 /
- 动力系数 /
- 爆炸荷载 /
- 动力响应
Abstract:
To improve the blast resistance of reinforced concrete (RC) beam, an efficient design method was proposed that bending the longitudinal bar as a wave at an appropriate location in the beam. Combing the experimental results and calculation of finite element model, the damage process of the RC beam with local kinked rebar was found, and the mechanism of blast resistance was revealed. Analytical results indicated that the kinked rebar can increase the allowable deformation of the RC beam under blast loads, effectively absorbing the explosive energy and greatly improving the blast-resistant performance. A theoretical method was developed to calculate the blast resistance of the RC beam with local kinked rebar under blast loads, on base of the energy method. Explicit formulae of the dynamic resistance coefficient were derived. The influences of three key design parameters, e.g. the bearing capacity ratio of platform period to yielding period, the deformation ratio of platform period to elastic period and the deformation ratio of yielding period to elastic period, on the blast resistance of RC beam with local kinked rebar were discussed. It provides a theoretical basis for further engineering application.
- kinked rebar /
- RC beam /
- dynamic resistance coefficient /
- blast load /
- dynamic response

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图 1 普通平直钢筋和起波钢筋

Figure 1. Kinked rebar compared with traditional rebar

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图 2 配起波纵筋RC梁的荷载-挠度曲线

Figure 2. Load-deflection curve of the RC beam with local kinked rebar

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图 3 起波钢筋准静态拉伸实验

Figure 3. Stretching test of the kinked rebar specimen

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图 4 起波钢筋等效应力应变关系

Figure 4. Equivalent stress- strain curves

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图 5 起波配筋梁的受力及破坏过程示意图

Figure 5. Failure process of the RC beam with local kinked rebar

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图 6 起波配筋梁简化抗力曲线

Figure 6. Theoretical load-deflection curve of the RC beam with local kinked rebar

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图 7 起波配筋梁模型及有限元计算结果

Figure 7. Model of RC beam with local kinked rebars and FEM results

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图 8 RC梁有限元计算模型(单位: mm)

Figure 8. FE model of RC beam (unit: mm)

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图 9 等效塑性应变云图

Figure 9. Equivalent plastic strain

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图 10 跨中钢筋应变与跨中挠度的关系

Figure 10. Relation between mid-span deflection and steel strain

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图 11 总吸能与跨中钢筋应变的关系

Figure 11. Total absorbed energy vs. steel strain

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图 12 理想弹塑性等效单自由度体系

Figure 12. Elastic-perfectly plastic SDOF system

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图 13 突加平台形荷载

Figure 13. Platform load

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图 14 瞬息冲量荷载

Figure 14. Instantaneous load

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图 15 三角形衰减荷载

Figure 15. Triangular declining load

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图 16 爆炸荷载作用下起波配筋梁动态响应

Figure 16. Dynamic response for RC beams with local kinked rebar under the blast load

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图 17 刚度比κ_e,p的拟合结果

Figure 17. Fitting results of κ_e,p

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图 18 平台形荷载作用下起波配筋RC梁的抗力动力系数

Figure 18. Dynamic resistance coefficent of RC beams with kinked rebars under platform load

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图 19 瞬息冲量荷载作用下起波配筋RC梁的抗力动力系数

Figure 19. Dynamic resistance coefficent of RC beams with kinked rebars under instantaneous load

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表 1 起波配筋RC梁参数

Table 1. Parameters of the RC beam with local kinked rebar

混凝土强度/MPa	纵筋屈服强度/MPa	纵筋极限强度/MPa	箍筋屈服强度/MPa	箍筋极限强度/MPa	跨长/m	梁宽/m	梁高/m
43.4	441.1	686.2	338.1	470.1	2.7	0.2	0.3

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表 2 ${\bar K_{1,2}}$ 、Ψ_1,e、Ψ_2,e、κ_e,p的主要影响因素

Table 2. Major factors of ${\bar K_{1,2}}$ , Ψ_1,e, Ψ_2,e, κ_e,p

参数	主要影响因素
$\scriptstyle {\bar K_{1,2}}$	钢筋在RC梁中的起波位置
Ψ_1,e	钢筋的起波矢高、起波角度
Ψ_2,e	钢筋的伸长率，RC梁的配筋率
κ_e,p	钢筋的强度、起波角度、起波矢高，RC梁的截面高度

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表 3 算例参数范围

Table 3. Parameter scope for theoretical analysis

参数	$\scriptstyle{\bar K_{1,2}}$	Ψ_1,e	Ψ_2,e
范围	0, 0.5, 0.9	[0,7]	[0,10]

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