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一、前言地震反应是震害分析的基础。工程的场地地质条件对地震反应的影响,是目前抗震设计最关心的问题之一。其中尤以土质条件对地震反应的影响最受重视。从地质角度来看,作为一个地质体,其组成物质的性质变化是很复杂的,主要表现在空间变化的特点上。特别在平原地区,由于地壳运动和人为因素的影响,在垂直剖面上岩相变化是很剧烈的。在实际工作中,几乎不易找到单一不变岩性的地层,当然,在水平方向上,岩相也有相应的变化。地质体的地震反应特点在震害分析中的意义及其有效性,在《唐山地震北京几个异常破坏区的原因探讨》一文中已作过详细论述。
I. Introduction Earthquake response is the basis of earthquake damage analysis. The influence of site geological conditions on seismic response is one of the most concerned issues in seismic design. Among them, the influence of soil conditions on earthquake response is the most important. From a geological point of view, as a geological body, the nature of its constituent materials is very complex, mainly reflected in the characteristics of spatial change. Especially in the plain areas, due to the influence of the crustal movement and human factors, the change of the lithofacies in the vertical profile is very dramatic. In practical work, it is almost impossible to find a single invariant lithologic formation. Of course, in the horizontal direction, the lithofacies also have corresponding changes. The significance and effectiveness of the seismic response characteristics of geological bodies in seismic damage analysis have been discussed in detail in the article “Discussions on the Causes of the Tangshan Earthquake in Several Abnormally Damaged Areas in Beijing.”