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

9314197 Sozen Research被提议为地震不频繁发生的地区开发一种替代的地震危险性评估技术。拟议的工作包括：(A)制定专门用于确定将威胁生命的建筑物的程序；(B)利用遭受强烈地震袭击的建筑物的数据对新的和当前最先进的程序进行校准；(C)分析当前和拟议技术在为中低地震活动区制订减少风险战略方面的优缺点。这项研究旨在关注实地体验。来自31座部分受损建筑的信息将被使用，这些建筑的侧向力抵抗系统从几乎没有到几乎不能接受。该项目的建筑物的重要特征是，它们都能在强地震动(Amax=0.5g)中幸存下来，而不会造成危及生命的破坏，而且它们都会通过最先进的评估程序被评估为危险。该项目将包括六项任务：任务！-选择和确定用于定义结构和地面运动的参数。这些指标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本抗剪强度系数，以及反映结构和非结构构件的综合影响的指标。任务二--选择一套5至9个结构进行分析的研究。将进行选择，以便包括涵盖第一阶段确定的参数的适当范围的实例。任务三--对选定的结构集合进行详细研究。每个选定的结构都将使用图尔基耶、美国和日本使用的标准分析和评估方法对每个方向进行评估。分析的范围从二维线性到三维非线性，这取决于信息的质量、框架的类型和对回报的感知。任务四--确定评价结果与意见之间的不一致之处。在这一关键阶段，将研究评价结果和观察结果之间的不相容之处，以确定哪些差异可以通过可信的输入或建模修改来调和，哪些不能这样调和。任务V-综合。这一阶段将涉及修改标准技术以适应(到目前为止是更可取的选择)或开发全新方法的工作。任务六--重新校准。将使用(A)整套31栋建筑、(B)在1992年3月事件中倒塌的Erzincan的六栋建筑和(C)美国中部和东部的典型非金属建筑来校准制裁程序。第一个将记录任务1至任务四。第二个将显示任务五和六的结果。*

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. ***