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
发布时间：2019-04-01 10:10
【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 under the condition of lying rigid bedrock is an energy "semi-open-semi-closed" system. The difference between the model and the full energy "open" system earth-structure system seismic response analysis model is that it adopts the input mode of the inertial force in the domain. This is the same as the input mode of seismic response analysis model of rigid bedrock-structure system. Different from the structural seismic response analysis model on rigid bedrock, the seismic response analysis model of soil-structure system under the condition of rigid bedrock needs to consider the influence of semi-infinite soil layer on the cut-off boundary. As far as I can see, there are many researchers and engineers who have misunderstood this problem and think that the effect of truncation boundary is only a problem of artificial boundary processing. In the analysis, only artificial boundary conditions are used to simulate the effect of truncated boundary on radiation energy, and a more important influence factor, the free field effect of site soil under the condition of lying rigid bedrock, is neglected. In order to clarify this problem, based on the direct analysis model of seismic response of soil-structure system, the seismic response analysis method of soil-structure system under the condition of lying rigid bedrock is derived strictly. It is pointed out that omitting the free field motion effect in the usual engineering experience scale will not get the correct calculation results.
【作者单位】： 北京工业大学城市与工程安全减灾教育部重点实验室;
【基金】：国家自然科学基金创新研究群体项目(51421005);国家自然科学基金重大研究计划集成项目(91215301)
【分类号】：TU311.3
[Abstract]:The seismic response analysis model of soil-structure system under the condition of lying rigid bedrock is an energy "semi-open-semi-closed" system. The difference between the model and the full energy "open" system earth-structure system seismic response analysis model is that it adopts the input mode of the inertial force in the domain. This is the same as the input mode of seismic response analysis model of rigid bedrock-structure system. Different from the structural seismic response analysis model on rigid bedrock, the seismic response analysis model of soil-structure system under the condition of rigid bedrock needs to consider the influence of semi-infinite soil layer on the cut-off boundary. As far as I can see, there are many researchers and engineers who have misunderstood this problem and think that the effect of truncation boundary is only a problem of artificial boundary processing. In the analysis, only artificial boundary conditions are used to simulate the effect of truncated boundary on radiation energy, and a more important influence factor, the free field effect of site soil under the condition of lying rigid bedrock, is neglected. In order to clarify this problem, based on the direct analysis model of seismic response of soil-structure system, the seismic response analysis method of soil-structure system under the condition of lying rigid bedrock is derived strictly. It is pointed out that omitting the free field motion effect in the usual engineering experience scale will not get the correct calculation results.
【作者单位】： 北京工业大学城市与工程安全减灾教育部重点实验室;
【基金】：国家自然科学基金创新研究群体项目(51421005);国家自然科学基金重大研究计划集成项目(91215301)
【分类号】：TU311.3
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