桥梁整体安全余度及抗连续倒塌问题研究方法
发布时间：2018-09-03 08:37
【摘要】：桥梁结构的安全余度是指桥梁在个别构件失效后的剩余承载能力。在桥梁结构中任何构件都不是单独工作,而是始终处在相互作用影响下。现代桥梁在运营阶段部分构件的损伤与破坏不可完全避免,为了保证部分构件失效时结构具有良好的抗连续倒塌能力以确保结构的整体性,近年来,欧美国家颁布了结构抗连锁倒塌设计标准,以改善结构的安全余度储备。本研究通过对桥梁安全余度和抗连续倒塌研究发展状况的简要评述,介绍了结构安全余度的定义,讨论了桥梁安全余度和抗连续倒塌分析及评价的3类方法的演变和发展。判定性方法主要是基于桥梁的在荷载作用下的位移、承载力、能量、结构构件敏感性在桥梁破损发生后的变化确定结构的安全储备;结构概率方法是基于可靠理论针对桥梁在特定荷载作用下的相对可靠指标进行分析以求得结构的失效概率;基于风险分析方法主要是在确定了结构面临的风险以及相应的结构易损性后着重考虑了结构倒塌对于经济、社会、环境等方面的综合影响。指出了目前桥梁安全余度和抗连续倒塌分析的研究与应用方面的缺陷,并提出有待进一步研究的问题。文中指出:判定性方法应计入荷载作用形式对桥梁破坏过程的影响;对复杂结构桥梁安全余度评定制订出相应的应用标准;完备关于连续倒塌各方面影响的相关预测数据作为基于风险分析方法分析的基础。
[Abstract]:The safety redundancy of bridge structure refers to the residual bearing capacity of the bridge after the failure of individual components. In the bridge structure, any component does not work alone, but always under the influence of interaction. The damage and damage of some members of modern bridge are unavoidable in the operation stage. In order to ensure that the structure has good ability to resist continuous collapse and ensure the integrity of the structure when some members fail, in recent years, the damage and damage of some members of modern bridge are not completely avoided. European and American countries have issued design standards for structural chain collapse in order to improve structural safety reserves. Based on a brief review of the development of research on bridge safety redundancy and continuous collapse resistance, the definition of structural safety redundancy is introduced, and the evolution and development of three kinds of methods for bridge safety redundancy and continuous collapse analysis and evaluation are discussed. The judging method is mainly based on the displacement, bearing capacity, energy and sensitivity of the bridge under load to determine the safety reserve of the structure after the damage of the bridge. The structural probability method is based on the reliability theory to analyze the relative reliability index of the bridge under the specific load to obtain the failure probability of the structure. Based on the risk analysis method, the comprehensive effects of structural collapse on economy, society, environment and so on are considered after determining the risk of structure and the corresponding structural vulnerability. The defects in the research and application of the analysis of bridge safety redundancy and continuous collapse resistance are pointed out, and the problems to be further studied are put forward. In this paper, it is pointed out that the determinative method should take into account the influence of the form of load on the bridge failure process, and draw up the corresponding application standard for the evaluation of the safety redundancy of the bridge with complex structure. Complete prediction data about the impact of continuous collapse are used as the basis of risk analysis.
【作者单位】： 长安大学公路学院;
【基金】：中国博士后科学基金项目(2015M572511)
【分类号】：U447
本文编号：2219457
[Abstract]:The safety redundancy of bridge structure refers to the residual bearing capacity of the bridge after the failure of individual components. In the bridge structure, any component does not work alone, but always under the influence of interaction. The damage and damage of some members of modern bridge are unavoidable in the operation stage. In order to ensure that the structure has good ability to resist continuous collapse and ensure the integrity of the structure when some members fail, in recent years, the damage and damage of some members of modern bridge are not completely avoided. European and American countries have issued design standards for structural chain collapse in order to improve structural safety reserves. Based on a brief review of the development of research on bridge safety redundancy and continuous collapse resistance, the definition of structural safety redundancy is introduced, and the evolution and development of three kinds of methods for bridge safety redundancy and continuous collapse analysis and evaluation are discussed. The judging method is mainly based on the displacement, bearing capacity, energy and sensitivity of the bridge under load to determine the safety reserve of the structure after the damage of the bridge. The structural probability method is based on the reliability theory to analyze the relative reliability index of the bridge under the specific load to obtain the failure probability of the structure. Based on the risk analysis method, the comprehensive effects of structural collapse on economy, society, environment and so on are considered after determining the risk of structure and the corresponding structural vulnerability. The defects in the research and application of the analysis of bridge safety redundancy and continuous collapse resistance are pointed out, and the problems to be further studied are put forward. In this paper, it is pointed out that the determinative method should take into account the influence of the form of load on the bridge failure process, and draw up the corresponding application standard for the evaluation of the safety redundancy of the bridge with complex structure. Complete prediction data about the impact of continuous collapse are used as the basis of risk analysis.
【作者单位】： 长安大学公路学院;
【基金】：中国博士后科学基金项目(2015M572511)
【分类号】：U447
【相似文献】
相关硕士学位论文 前2条
1 安风明;基于OpenSees的群桩体系桥梁连续倒塌分析[D];长安大学;2015年
2 成丕富;桥梁结构连续倒塌研究[D];中南大学;2012年
，本文编号：2219457
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2219457.html
