Implications of Recorded Data from the 1992 Southern California Earthquakes for Earthquake-Resistant Design

9301962 Bertero 6月28日的兰德斯EQ是自1952年以来加州最大的EQ，震级为7.4，在自由场和建筑物中都有一组重要的强震记录。在此之前，四月发生了约书亚树地震和大熊地震。从这些地震中记录的数据为研究长时间多次发生的强地面运动对结构反应的影响提供了一个极好的机会。更具体地说，这项研究的目标是：(1)评估这些最近记录的南加州地震的潜在破坏，(2)评估多个eq对不同仪器结构的力学特性的影响，这些结构的反应被记录下来，(3)评估长时间强地面运动对各种结构系统的影响，并将其与美国以外记录的长时间地面运动的反应联系起来。(4)评估目前建筑规范中使用的有关抗震设计系数Cd和结构系统系数Rw的实践现状所获得的结果的含义；(5)尝试制定比目前使用的更好的程序来建立设计EQ；(6)将分析预测的建筑特性和性能与记录和观察到的行为进行比较，以便校准：这些结构的实际刚度、强度（特别是由此产生的超过现行规范要求的强度）、扭转效应、土-结构相互作用效应、变形响应参数、可能的耗能能力及其损伤指标，(7)评估h) 0*0*0*，进一步研究非弹性反应谱和能量考虑在建筑结构抗震设计中的应用。并量化屈服抗力、地震系数和设计延性的概念，以适用于建筑规范的要求，(8)评估非线性静力加载程序在抗震设计中的可靠性和实际应用，(9)制定实际多自由度体系的等效SDOF模型，可用于分析结构在各级地震运动下的性能。（10）尝试制定指导方针，以选择有效的策略和技术来对已进行的研究表明在未来发生严重的强震时可能存在潜在危险的建筑物进行抗震升级。＊＊＊

9301962 Bertero The Landers EQ of June 28 was the largest EQ in California since 1952, with a magnitude of 7.4 and a significant set of strong motion recordings both in the free field and in buildings. It was preceded by the Joshua Tree and Big Bear earthquakes in April. The data recorded from these earthquakes present an excellent opportunity to study the effect of long duration multiple occurrence of strong ground motions on structural response. More specifically the objectives of this study is to: (1) evaluate the damage potential of these recently recorded recent Southern California earthquakes, (2) evaluate the effects of multiple EQs on the mechanical characteristics of different instrumented structures whose responses were recorded, (3) evaluate the effects of long duration strong ground motion on various structural systems and to correlate this with the response to long duration ground motions recorded outside of the U.S., (4) assess the implications of the results obtained with respect to the present state of the practice regarding the seismic design coefficient, Cd, and the structural system coefficient, Rw, as currently used by building codes, (5) attempt to formulate a better procedure for establishing the design EQ than is currently being used, (6) compare the analytically predicted building characteristics and performance to both the recorded and the observed behavior in order to calibrate: the actual stiffness, the strength (particularly the resulting overstrength to that required by present codes), the torsional effects, the soil structure interaction effects, the deformational response parameters, the probable energy dissipation capacity of these structures and their damage indices, (7) evaluate h) 0*0*0* further the application of inelastic response spectra and energy considerations for earthquake resistant design of building structures, and to quantify the concepts of yield resistance, seismic coefficient and design ductility for application to building code requirements, (8) evaluate the reliability and practical application of a nonlinear static loading procedure to earthquake resistance design, (9) formulate an equivalent SDOF model of the actual multi degree of freedom system that can be used to analyze the performance of the structure under earthquake motions at all levels, (10) attempt to formulate guidelines for the selection of efficient strategies and techniques for the seismic upgrading of buildings that the conducted studies have shown to be potentially hazardous in case of future severe EQGMs. ***