•  
  •  
 

Corresponding Author

林志成，男，硕士研究生.E-mail：1203944282@qq.com

Abstract

To study the dynamic response and damage characteristics of the super-wide concrete self-anchored suspension bridge under the blast loading,a real bridge with these characteristics was selected as the background,and the numerical simulation was used to analyze the dynamic response of the top surface crack shape and the vertical displacement of the bottom plate of the super-wide box girder under the close blast of the bridge deck.Firstly,the refined finite element model of the whole bridge was established by using SolidWorks and HyperMesh.Secondly,the blast loading was applied by Ansys/LS-DYNA and *LOAD_BLAST_ENHANCED (LBE ) method,and the reliability of the calculation method was verified by combining the blast test results of concrete members in the literature.Finally,the dynamic response of the bridge under different explosive equivalents and different lateral and longitudinal blast positions was analyzed parametrically.The results show that when the TNT equivalent is 300 kg,the stress of the concrete unit right below the blast center reaches the limit value and fails,forming an elliptical crack.With the increase of TNT charge,the peak value of vertical displacement at the center of the bottom plate directly below the blast center increases continuously,with the vertical displacement reaching 135.9 mm after 50 ms of blast under 1000 kg charge.With the increase of the distance to the explosion center,the vertical displacement of the bottom plate decreases,and the increase speed of the vertical displacement slows down.The internal force change of the suspender correlates with the vertical displacement of the bottom plate of the connected box girder.The larger the vertical displacement of the bottom plate of the box girder,the higher the first peak value of the internal force change of the suspender.Under the same explosive equivalent,when the explosion center is at different positions in the lateral and longitudinal directions of the bridge,the difference in the dynamic response and crack shape of the super-wide box girder is mainly caused by the different support and restraint effects of the cross diaphragm and web.The research results can provide important references for anti-blast protection and reinforcement of self-anchored concrete suspension bridges.

Publication Date

6-27-2024

DOI

10.14048/j.issn.1671-2579.2024.03.018

First Page

153

Last Page

163

Submission Date

February 2025

Reference

[1]陈永亮 ，何世永 ，夏支贤 ，等.复杂地质条件下山区悬索桥锚碇选型及设计 [J].中外公路 ，2023 ,43（2） ：107-111.CHEN Yongliang ，HE Shiyong ，XIA Zhixian ，et al .Selection and design of anchorage for suspension bridge in downhill area under complex geological conditions [J].Journal of China & Foreign Highway ,2023 ，43(2):107-111.
[2]张 欣 ，李 瑜 ，刘 勇 .大 跨 度 自 锚 式 悬 索 桥 钢 ‒UHPC 轻 型组 合 加 劲 梁 构 造 设 计 研 究 [J].中 外 公 路 ，2023 ,43（4） ：147-152.ZHANG Xin ，LI Yu ，LIU Yong .Research on structural design of Steel-UHPC light composite beam of large-span self-anchored suspension bridge [J].Journal of China & Foreign Highway ,2023 ，43(4):147-152.
[3]王雅 .自锚式悬索桥静动力及爆炸冲击波下的响应研究[D].西安 :长安大学 ,2020 .WANG Ya .Research on response of self-anchored suspension bridge under static and dynamic and explosive shock waves [D].Xi’an:Chang ’an University ,2020 .
[4]杨 赞 ,韩 国 振 .接 触 爆 炸 作 用 下 钢 筋 砼 箱 梁 动 态 响 应 过程数值模拟 [C]// 第27届全国结构工程学术会议论文集(第二册 ).西安 ,2018 :463-470.YANG Zan ,HAN Guozhen .Numerical simulations on dynamic response process of reinforced concrete box girder under contact blasting [C]// Proceedings of the 27th National Conference on Structural Engineering Vol .II.Xi’an,2018 :463-470.
[5]彭胜 .爆炸冲击荷载作用下混凝土 T梁桥动态响应分析[D].武汉 :武汉科技大学 ,2016 .PENG Sheng .A dissertation submitted in partial fulfillment of the requirements for the degree of master in engineering [D].Wuhan :Wuhan University of Science and Technology ,2016 .
[6]刘青 .爆炸作用下立交桥的动力响应与破坏模式 [D].济南:山东建筑大学 ,2014 .LIU Qing .The dynamic response and failure mode of overpass bridge under explosion [D].Jinan :Shandong Jianzhu University ,2014 .
[7]姜文恺 .爆炸冲击荷载作用下桥梁结构的动态响应分析[D].成都 :西南交通大学 ,2017 .JIANG Wenkai .Dynamic response analysis of bridge structures under explosive impact load [D].Chengdu :Southwest Jiaotong University ,2017 .
[8]邱敏杰 .爆炸荷载作用下预应力混凝土桥梁结构的动态响应及破坏机理研究 [D].西安 :西安理工大学 ,2021 .QIU Minjie .Research on dynamic response and failure mechanism of prestressed concrete bridge structure under blast load [D].Xi’an:Xi’an University of Technology ,2021 .
[9]IBRAHIM A ,SALIM H .Numeical prediction of the dynamic response of prestressed concrete box girder bridges under blast loads [C]//11th International LS-DYNA Conference ,USA Detroit ,2010 .
[10]娄凡 .预应力混凝土连续 T梁的抗爆性能试验研究 [D].南京 :东南大学 ,2018 .LOU Fan .Experimental study on blast resistance of prestressed concrete continuous T beams [D].Nanjing :Southeast University ,2018 .
[11]院素静 .爆炸荷载作用下混凝土梁桥倒塌破坏机理研究[D].南京 :东南大学 ,2019 .YUAN Sujing .Study on collapse failure mechanism of concrete girder bridge under explosion load [D].Nanjing :Southeast University ,2019 .
[12]SHIRAVAND M R ,PARVANEHRO P .Numerical study on damage mechanism of post-tensioned concrete box bridges under close-in deck explosion [J].Engineering Failure Analysis ,2017 ,81:103-116.
[13]胡志坚 ,张一峰 ,俞文生 ,等.近场爆炸时预应力混凝土梁体抗爆分析 [J].中国公路学报 ,2019 ,32(3):71-80.HU Zhijian ,ZHANG Yifeng ,YU Wensheng ,et al .Anti-blast resistance analysis of prestressed concrete bridges under close-by blast [J].China Journal of Highway and Transport ,2019 ,32(3):71-80.
[14]胡志坚 ,唐杏红 ,方建桥 .近场爆炸时混凝土桥梁压力场与响应分析 [J].中国公路学报 ,2014 ,27(5):141-147,157.HU Zhijian ,TANG Xinghong ,FANG Jianqiao .Analysis of pressure field and response for concrete bridges under close blast loading [J].China Journal of Highway and Transport ,2014 ,27(5):141-147,157.
[15]曾珍 .爆炸作用下钢筋混凝土桥梁压力场分析及损伤效应研究 [D].武汉 :武汉理工大学 ,2016 .ZENG Zhen .Study of pressure distribution and damage effect for concrete bridges subjected to vehicle-mounted blast loads [D].Wuhan :Wuhan University of Technology ,2016 .
[16]李源 ,刘建昱 ,韩逸涛 .爆炸荷载下钢筋混凝土桥面板损伤机理研究 [J].中国公路学报 ,2021 ,34(7):291-300.LI Yuan ,LIU Jianyu ,HAN Yitao .Damage mechanism of reinforced concrete bridge decks under blast loads [J].China Journal of Highway and Transport ,2021 ,34(7):291-300.
[17]缪卫清 ,宋华 ,常军 .基于极限承载与局部破坏冗余度的桥梁优化设计 [J].中外公路 ,2021 ,41(5):126-131.MIAO Weiqing ,SONG Hua ,CHANG Jun .Optimization design of bridges based on ultimate load capacity and local damage redundancy [J].Journal of China & Foreign Highway ,2021 ,41(5):126-131.
[18]邱 文 白 .RC矩 形 空 心 截 面 桥 墩 柱 抗 爆 性 能 研 究 [D].长沙:国防科学技术大学 ,2016 .QIU Wenbai .Research on the resistance of RC piers with rectangular hollow section subjected to blast loading [D].Changsha :National University of Defense Technology ,2016 .
[19]MALVAR L J ,CRAWFORD J E ,WESEVICH J W ,et al .A plasticity concrete material model for DYNA 3D[J].International Journal of Impact Engineering ,1997 ,19(9/10):847-873.
[20]周广盼 .超宽混凝土自锚式悬索桥成桥状态控制与空间力学行为研究 [D].南京 :东南大学 ,2018 .ZHOU Guangpan .Study of completion state control and spatial mechanics behaviors of self-anchored suspension bridge with extra-wide concrete girder [D].Nanjing :Southeast University ,2018 .
[21]孙文彬 .钢筋混凝土板的爆炸荷载试验研究 [J].辽宁工程技术大学学报 (自然科学版 ),2009 ,28(2):217-220.SUN Wenbin .Experimental studies on reinforced concrete(RC) slabs subjected to blast loads [J].Journal of Liaoning Technical University (Natural Science ),2009 ,28(2):217-220.
[22]United States ，Federal Emergency .Reference manual to mitigate potential terrorist attacks against buildings :Providing protection to people and buildings [M].Miami :General Books LLC ,2012 .
[23]孔新立 ,金丰年 ,蒋美蓉 .恐怖爆炸袭击方式及规模分析[J].爆破 ,2007 ,24(3):88-92.KONG Xinli ,JIN Fengnian ,JIANG Meirong .Analysis of way and scale of terroristic raid [J].Blasting ,2007 ,24(3):88-92.

Download

Share

COinS