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Framework for the fully probabilistic analysis of excavation-induced serviceability damage to buildings in soft clays.

机译：挖掘概率对软土中建筑物的使用性损害进行全概率分析的框架。

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摘要

In this dissertation, a framework for a fully-probabilistic analysis of the potential for building serviceability damage induced by an excavation in soft clays is established. This analysis framework is established based on the concept of a serviceability limit state where the resistance is represented by the capacity of a building to resist serviceability damage, and the loading is represented by the demand on a building due to excavation-induced ground movements. In this study, both the resistance and the loading are treated as a random variable; the resistance is characterized empirically based on a database of the observed building performance while the loading is estimated for a specific case using semi-empirical models that were created with the results of finite element analysis and field observations.;A simplified procedure is developed for estimating the loading on a building induced by an excavation. In this simplified procedure, the loading is expressed in terms of damage potential index (DPI) that is based on the concept of principal strain. On the other hand, the resistance as a random variable is characterized based on observed building performance, also in terms of the DPI. The uncertainties of both the resistance and the loading are fully characterized in this dissertation study to enable a fully probabilistic analysis. The developed framework for the fully-probabilistic assessment of the potential for excavation-induced building damage is demonstrated with the well-known TNEC case history.;Finally, since the observational method is commonly applied to the design and construction of excavation systems, a simplified scheme for updating the soil parameters (and consequently DPI) based on the observations of the maximum wall deflection and ground settlement is developed. This updating scheme is demonstrated with an excavation case history and shown to be an effective technique for monitoring the damage potential of buildings adjacent to an excavation.;The developed framework allows for fully-probabilistic assessment of the potential of building damage induced by an excavation, and thusly, provides engineers with a more transparent assessment of the risk associated with a particular excavation design and construction. Furthermore, with the observational method, the potential for excavation-induced serviceability damage can be reassessed as the excavation proceeds. With this approach, the excavation system can be monitored as the excavation proceeds and necessary measures can be taken to prevent damage to buildings adjacent to the excavation.
机译：本文建立了一个框架，用于对在软土中开挖引起的建筑物使用性损害的可能性进行全概率分析。该分析框架是基于可使用性极限状态的概念建立的，其中阻力由建筑物抵抗可使用性破坏的能力表示，而荷载则由由于开挖引起的地面运动而对建筑物的需求表示。在这项研究中，电阻和负载均被视为随机变量。基于观察到的建筑性能的数据库根据经验对阻力进行表征，同时使用半经验模型（根据有限元分析和现场观测的结果创建）为特定情况估算荷载。;开发了一种简化的程序来估算开挖引起的建筑物荷载。在此简化过程中，载荷是根据潜在应变指数（DPI）表示的，该指数基于主应变的概念。另一方面，作为随机变量的电阻也基于观察到的建筑性能（也就DPI）进行了表征。本论文的研究充分描述了电阻和载荷的不确定性，以进行完全概率分析。 TNEC的案例历史证明了已开发出的用于对概率性挖掘引起的建筑物破坏可能性进行全概率评估的框架。最后，由于观测方法通常用于挖掘系统的设计和施工，因此简化了根据最大墙体挠度和地面沉降的观测结果，开发了用于更新土壤参数（进而更新DPI）的方案。此更新方案通过开挖案例历史进行了演示，并被证明是一种监控开挖相邻建筑物的潜在破坏力的有效技术。;开发的框架允许对开挖引起的建筑物破坏的可能性进行全概率评估，因此，为工程师提供了与特定挖掘设计和施工有关的风险的更透明评估。此外，采用观测方法，可以随着开挖的进行重新评估开挖引起的使用性损害的可能性。通过这种方法，可以在挖掘过程中对挖掘系统进行监控，并可以采取必要的措施来防止破坏与挖掘相邻的建筑物。

著录项

  • 作者

    Schuster, Matt John.;

  • 作者单位

    Clemson University.;

  • 授予单位 Clemson University.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 153 p.
  • 总页数 153
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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