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类型 基础研究 预答辩日期 2017-12-03
开始(开题)日期 2013-12-17 论文结束日期 2017-10-13
地点 土木馆210室 论文选题来源 省(自治区、直辖市)项目    论文字数 10.4 (万字)
题目 强震下混凝土连续梁桥的倒塌破坏与控制研究
主题词 钢筋混凝土连续梁桥,地震模拟振动台台阵试验,板式橡胶支座,高阻尼橡胶支座,非线性有限元模型
摘要 本文以钢筋混凝土两跨连续梁桥为研究对象,基于振动台试验和数值模拟,探索多跨连续梁桥在多维地震动作用下的非线性动力灾变机理及其倒塌控制方法,主要工作包括:(1)进行连续梁桥比例模型在多维地震动输入下的地震振动台台阵试验研究;(2)分别基于隐式积分和显式积分技术,建立多跨连续梁桥的空间非线性有限元模型,进行不同地震动输入的非线性动力时程反应分析;(3)进行了高阻尼橡胶支座力学性能试验研究;(4)进行了多跨连续梁桥在多维地震动作用下的倒塌破坏分析,探索其损伤演化、局部和整体倒塌全过程;(5)对比分析了高阻尼橡胶支座隔震、液体黏滞阻尼器减震和lock up速度锁定装置减震等三种倒塌控制方法的控制效果,并尝试建立连续梁桥抗倒塌设计策略。 主要研究结论如下: (1)采用普通橡胶支座的连续梁桥,在纵向短周期地震动下的简支墩振动响应强于固定墩,在纵向长周期地震动下固定墩的振动加速度大于简支墩;横向地震动作用下梁墩横向相对位移大于纵向;长周期地震动比短周期地震动引起更大的上下部结构相对位移,且相对位移峰值并不出现在墩、梁振动最剧烈、振幅最大的时刻。 (2)采用高阻尼橡胶支座隔震后主梁的加速度响应稍有增长而下部结构的加速度响应减弱,简支墩的减震效果尤其显著;同时降低了连续梁结构的上、下部结构的相对位移和落梁的风险;提出了高阻尼橡胶支座的双线性恢复力模型,可应用于此类隔震支座桥梁的地震响应分析。 (3)基于能量平衡原理,提出了连续梁桥基于结构的桥梁倒塌准则;通过t时刻的结构总能量与外力功之比?可找到结构损伤和倒塌破坏的潜在时刻,对于两跨连续梁桥建议当能量比小于85%即可判定进入倒塌阶段。 (4)强震下连续梁桥主要发生两种倒塌破坏模式:模式一是中墩先失效进而引起主梁落梁,模式二是墩梁相对位移过大引起整体落梁;提出的损伤指标D可对两跨连续梁模型的损伤状态做出合理、有效评价。 (5)可采用高阻尼橡胶支座隔震、液体黏滞阻尼器减震和lock up速度锁定装置等三种倒塌控制方法提高强震下连续梁桥的抗倒塌能力,其中液体黏滞阻尼器和速度锁定装置均比高阻尼橡胶支座能够有效控制主梁位移。 (6)提出桥梁结构三阶段抗倒塌设计策略,包括概念设计、抗整体倒塌设计、抗连续倒塌设计;在连续梁桥概念设计阶段,可采用高阻尼橡胶支座可进行中短周期地震动下倒塌控制,采用液体黏滞阻尼器或速度锁定装置进行长周期地震动下的倒塌控制;抗整体倒塌设计分为延性设计和可恢复性设计两种。
英文题目 study on collapse failure and control of concrete continuous girder bridge under strong earthquake
英文主题词 Reinforced concrete continuous girder bridge, Shaking table array test, laminated rubber bearing, High damping rubber bearing, nonlinear finite element model
英文摘要 The situation of earthquake resistance and disaster prevention in our country is grim for China is one of countries with the worst earthquake disaster in the world. Concrete continuous girder bridge is the main type of highway bridge in service in China. In many great earthquakes, the continuous girder bridges have been damaged seriously. The existing seismic code has detailed the seismic design of continuous girder bridges under medium and small earthquakes, though there is no details of "big earthquakes don’t fall" in the norms. Therefore, it is of great theoretical significance and practical value to study the collapse failure mechanism and failure mode control of multi-span continuous girder bridges under great earthquakes. In this paper, the reinforced concrete two span continuous girder bridge is taken as the research subject. The nonlinear dynamic catastrophe mechanism and collapse control method of multi-span continuous girder bridge under multi-dimensional ground motion were explored, based on shaking table test and numerical simulation. The main work of this thesis included: (1) A continuous beam bridge model under multi-dimensional ground motion inputs was tested on shaking table. (2) The spatial nonlinear finite element model of multi-span continuous girder bridge was established based on implicit integration and explicit integration technique, and the nonlinear dynamic time history response analysis of different ground motion inputs was carried out. (3) The mechanical properties of high damping rubber bearing were experimental investigated. (4) The collapse failure analysis of multi-span continuous girder bridge under multi-dimensional earthquake motions was carried out, and the whole process of damage evolution, local and whole collapse were explored. (5) The control effects of three kinds of collapse control methods, which were the high damping rubber bearing, the fluid viscous damper and the lock up speed locking device, were compared and analyzed. The following observations and conclusions were made: (1) Simply supported pier vibration under the longitudinal short period shaking wave was stronger than that of the fixed pier, while the fixed pier vibration under the longitudinal long-period ground motion was greater than that of the simply supported pier for continuous girder bridge with laminated rubber bearings. The lateral relative displacement between the girder and the pier was larger than that under longitudinal shaking wave. The relative displacement of the upper and lower structures due to the long-period ground motion was larger than that under the short period ground motion. The peak value of relative displacement did not appear when the pier and the girder shock violently and their amplitudes were maximum. (2) The acceleration response of the girder increased slightly with the isolation of the high damping rubber bearing, while the acceleration response of the substructure was weakened. The damping effect was particularly notable of the simple supported pier. At the same time, the relative displacement between the upper and lower structures and the risk of the falling girder were reduced. The bilinear hysteretic model of high damping rubber bearing is proposed, which can be applied to the seismic response analysis of such bearing isolated bridge. (3) Based on the principle of energy balance, a bridge structural collapse criterion was proposed. Potential moment of structural damage or failure could be deduced by ratio of total energy to external work of force ? at t moment. It was suggested that when the energy ratio was less than 85%, the collapse stage could be determined. (4) There were two kinds of collapse failure modes of the continuous girder bridge under great earthquakes: the first is the failure of the middle pier and then the main girder falling; the mode two is the overall falling girder caused by the relative displacement between the pier and the girder. It is proved that index D could evaluate the damage state of two-span continuous girder bridge model reasonably. (5) Three kinds of methods, which were the high damping rubber bearing, the fluid viscous damper and lock up speed locking device, could improve collapse resistant capacity of continuous girder bridge under great earthquake. The liquid viscous damper and the speed locking device could more effectively control the displacement of the main girder than the high damping rubber bearing. (6) The proposed design strategy of anti-collapse involved three stages: conceptual design, anti-integral collapse design, anti-progressive collapse design. In the stage of concept design of continuous girder bridge, the high damping rubber bearing could control collapse under short period earthquake motion, while the liquid viscous damper or speed locking device could control collapse under long period earthquake motion. Anti-integral collapse design was divided into two kinds: ductility design and recoverable design.
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学术会议
会议名称时间地点本人报告本人报告题目
东南大学桥梁动力分析课题组 2014.12.5 土木馆210室 混凝土连续梁桥振动台试验与数值分析
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代表作
论文名称
钢筋混凝土连续梁桥模型振动台台阵试验
强震下钢筋混凝土连续梁桥非线性动力响应分析
单箱室波形钢腹板梁桥横向弯矩计算方法
Experimental Study on Mechanical Properties of High Damping Rubber Bearing Model
 
答辩委员会组成信息
姓名职称导师类别工作单位是否主席备注
李鸿晶 正高 教授 博导 南京工业大学
艾军 正高 教授 硕导 南京航空航天大学
王立彬 正高 教授 硕导 南京林业大学
王景全 正高 教授 博导 东南大学
郭彤 正高 教授 博导 东南大学
      
答辩秘书信息
姓名职称工作单位备注
李慧乐 其他 讲师 东南大学