An Alternative Approach to Earthquake-Hazard Evaluation for Concrete Building Structures

9314197 Sozen Research提出了一种针对地震不频繁地区的替代性地震危险性评价技术。拟议的工作包括(a)开发专门用于识别将威胁生命的建筑物的程序，(b)根据遭受强烈地震的建筑物的数据校准新的和当前最先进的程序，以及(c)分析当前和拟议的技术在制定低至中度地震活动地区降低风险策略方面的优势和劣势。这项研究的重点是实地经验。将使用来自31座部分受损建筑的信息，这些建筑的抗侧向力系统从完全没有到勉强可以接受。该项目的建筑的重要属性是，它们都在强烈的地面运动（Amax = 0.5G）中幸存下来，没有导致危及生命的破坏，并且它们都将通过最先进的评估程序被评估为危险。该项目将包括六个任务：-选择和确定用于定义结构和地面运动的参数。这些将包括标准的定量和定性指标，如框架描述符、计算的平移周期和基础抗剪强度系数，以及反映结构和非结构因素综合影响的指标。任务二-研究选择一组五到九个结构进行分析。在进行选择时，将使这组结构包括涵盖第一阶段确定的参数的适当范围的例子。任务三-对所选结构进行详细研究。将使用土耳其、美国和日本使用的标准分析和评估方法对每个选定的结构进行各个方向的评估。分析的范围从二维线性到三维非线性，视资料的质量、构架的类型和对回报的看法而定。任务iv -确定评估结果和观察结果之间的不兼容性。在这个关键阶段，将研究评估结果和观察结果之间的不相容，以确定哪些差异可以通过对输入或建模的可信修改来调和，哪些差异不能如此调和。任务五-综合。这一阶段将包括修改标准技术套件（到目前为止是更可取的选择）或开发全新方法的工作。VI-Recalibration任务。将使用(a)全部31幢建筑物，(b)在1992年3月事件中倒塌的Erzincan的6幢建筑物，以及(c)美国中部和东部的典型非金属建筑物来校准批准的程序。将编写两份报告供散发。第一个文件将记录任务1至任务IV。第二个文件将显示任务V和任务VI的结果

9314197 Sozen Research is proposed to develop an alternative earthquake-hazard evaluation technology for regions with infrequent earthquake occurrence. The proposed work includes (a) development of procedures specifically designed to identify buildings that will threaten life, (b) calibration of the new as well as current state-of-the-art procedures with data from buildings subjected to a strong earthquake and (c) analysis of the strengths and weaknesses of current and proposed technologies in formulation of risk-reduction strategies for regions of low to moderate seismicity. The research is designed to focus on field experience. The information from 31 partially damaged buildings, with lateral- force resisting systems ranging from effectively none to barely acceptable, will be used. The important attributes of the buildings for the project are that they all survived a strong ground motion (Amax = 0.5G) without leading to life-threatening damage and they all would have been evaluated to be hazardous by state-of-the art evaluation procedures. The project will include six tasks: Task !-Selection and determination of parameters to be used to define the structures and the ground motion. These will include standard quantitative and qualitative indices such as framing descriptors, calculated translation periods, and base shear strength coefficients as well as those reflecting the combined effect of structural and nonstructural elements. Task II-Studies to select a set of five to nine structures for analysis. The selection will be made so that the set includes examples covering suitable ranges of the parameters established in phase I. Task III-Detailed studies of the selected set of structures. Each selected structure will be evaluated in each direction using standard analysis and evaluation methods use in Turkiye, the U.S. and Japan. Analyses will range from two-dimensional linear to three-dimensional nonlinear, depending on the quality of the information , type of framing and perception of return. Task IV-Identification of incompatibilities between evaluation results and observations. In this critical phase, incompatibilities between results of evaluation and observation will be studied to identify which differences can be reconciled by credible modifications of the input or modeling and which cannot be so reconciled. Task V- Synthesis. This phase will involve work either to modify the standard techniques to suite (by far the preferable option) or to develop totally new approaches. Task VI-Recalibration. The sanctioned procedures will be calibrated using (a) the entire set of 31 buildings, (b) the six buildings in Erzincan that collapsed in the March 1992 event, and (c) typical nonmetallic buildings in central and eastern U.S. Two reports will be prepared for dissemination. The first will document tasks 1 to IV. The second will present results of tasks V and VI. ***