杜修力, 李洋, 赵密, 许成顺, 路德春. 下卧刚性基岩条件下场地土-结构体系地震反应分析方法研究[J]. 工程力学, 2017, 34(5): 52-59. DOI: 10.6052/j.issn.1000-4750.2015.09.0801
引用本文: 杜修力, 李洋, 赵密, 许成顺, 路德春. 下卧刚性基岩条件下场地土-结构体系地震反应分析方法研究[J]. 工程力学, 2017, 34(5): 52-59. DOI: 10.6052/j.issn.1000-4750.2015.09.0801
DU Xiu-li, LI Yang, ZHAO Mi, XU Cheng-shun, LU De-chun. SEISMIC RESPONSE ANALYSIS METHOD FOR SOIL-STRUCTURE INTERACTION SYSTEM OF UNDERLYING RIGID ROCK BASE SOIL CONDITION[J]. Engineering Mechanics, 2017, 34(5): 52-59. DOI: 10.6052/j.issn.1000-4750.2015.09.0801
Citation: DU Xiu-li, LI Yang, ZHAO Mi, XU Cheng-shun, LU De-chun. SEISMIC RESPONSE ANALYSIS METHOD FOR SOIL-STRUCTURE INTERACTION SYSTEM OF UNDERLYING RIGID ROCK BASE SOIL CONDITION[J]. Engineering Mechanics, 2017, 34(5): 52-59. DOI: 10.6052/j.issn.1000-4750.2015.09.0801

下卧刚性基岩条件下场地土-结构体系地震反应分析方法研究

SEISMIC RESPONSE ANALYSIS METHOD FOR SOIL-STRUCTURE INTERACTION SYSTEM OF UNDERLYING RIGID ROCK BASE SOIL CONDITION

  • 摘要: 下卧刚性基岩条件下的土-结构体系地震反应分析模型是一个能量“半开放-半封闭”系统。它与完全的能量“开放”系统土-结构体系地震反应分析模型的不同之处是其采用了域内惯性力的地震动输入方式,这与刚性基岩-结构体系地震反应分析模型的地震动输入方式是相同的。不同于刚性基岩上的结构地震反应分析模型,下卧刚性基岩条件下的土-结构体系地震反应分析模型需要考虑半无限土层对截断边界处的影响。就笔者-所见,目前有许多研究者和工程技术人员对这一问题有错误的理解,认为截断边界的影响只是一个人工边界处理问题,分析中仅采用人工边界条件模拟了截断边界对辐射能量的影响,而忽略了一个更重要的影响因素--下卧刚性基岩条件下场地土的自由场效应。为澄清这一问题,基于土-结构体系地震反应的直接分析模型,严格推导了下卧刚性基岩条件下的土-结构体系地震反应分析方法,指出在通常的工程经验尺度内遗漏自由场运动效应将得不到正确的计算结果。

     

    Abstract: The seismic response analysis model of soil-structure system of underlying rigid rock base soil condition is a “semi-open and semi-closed” energy system. Compared with a fully “open” energy system, the analysis model of the “semi-open and semi-closed” energy system employs the seismic input mode of an intra-domain inertial force. This input mode is exactly the same as that in the seismic response analysis model for the rigid rock base-structure system. Different from that of the structures built on rigid rock base, the analysis model of the soil-structure system with underlying rigid rock base soil conditions requires consideration of the influence of semi-infinite soil layers on the truncation boundaries. Many researchers and engineers have misunderstood this issue by assuming the effect of truncation boundaries is only an issue of an artificial boundary condition. Consequently, they have adopted artificial boundary conditions to simulate the impact of truncation boundaries on the radiation energy. In real engineering practice, a more important influential factor, i.e. the free field effect of the soil layer of underlying rigid rock base soil condition has been neglected in the analyses. In order to clarify this issue, based on the direct analysis model, the seismic analysis method for the soil-structure interaction of underlying rigid rock base soil condition was developed in this study. The results indicate that, in a typical engineering experience scale, omitting the free field effect at truncation boundaries would not obtain reasonable calculation results.

     

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