超高墩混凝土桥塔爆炸动力响应及损伤评估研究  

Research on Dynamic Response and Damage Assessment of Concrete Pylon with Super High Pier under Blast Loading

作　　者：周礼平[1] 马白虎 ZHOU Li-ping;MA Bai-hu(Guizhou Province Transportation Planning Survey and Design Institute Co.Ltd.,Guiyang 550081,China;Guizhou Highway Development Co.Ltd.,Guiyang 550081,China)

机构地区：[1]贵州省交通规划勘察设计研究院股份有限公司,贵阳市550081 [2]贵州省公路开发有限责任公司,贵阳市550081

出　　处：《公路》2021年第6期166-171,共6页Highway

基　　金：贵州省重大科技专项计划资助项目,项目编号黔科合重大专项字[2016]3013。

摘　　要：为了对超高墩斜拉桥混凝土桥塔爆炸动力响应及损伤评估进行研究,以平塘大桥超高混凝土桥塔作为研究对象,采用ANSYS/LS-dyna建立有限元模型进行数值模拟,对超高混凝土桥塔在爆炸冲击作用下的局部损伤进行了分析。通过对比3种等级汽车炸弹在近塔处爆炸时的结构响应,发现桥塔响应集中在爆点局部,整体响应很小;提出一种钢筋混凝土构件损伤程度评估的P-I曲线方法来评估钢筋混凝土构件爆炸冲击损伤状态;结合桥塔爆炸集中响应和钢筋混凝土构件爆炸冲击损伤状态评估,综合成本等控制因素,为同类型桥梁研究提供参考。In order to study the dynamic response and damage assessment of concrete pylon of cablestayed bridge with super high pier under explosion impact,in this paper the extra high concrete pylon of the Pingtang Bridge is taken as the research object,ANSYS/LS-DYNA is used to establish the finite element model for numerical simulation,and the local damage of ultra-high concrete pylon under the impact of explosion is analyzed.By comparing the structural response near the tower when explosion occurs from three different grades car bombs,it is found that the bridge tower response is concentrated in the local explosion point and the overall response is very small.The P-I curve method for evaluating the damage degree of reinforced concrete members is proposed to evaluate the damage state of reinforced concrete members by explosion impact.Combined with the centralized response of the bridge tower explosion and the state assessment of the damage caused by the explosion impact of reinforced concrete members,and considering on the comprehensive control factors such as cost,this paper can provide some reference for the study of similar bridges.

关 键 词：斜拉桥 混凝土桥塔 爆炸冲击荷载 局部损伤 P-I曲线 

分 类 号：U441.5[建筑科学—桥梁与隧道工程] U443.38[交通运输工程—道路与铁道工程]