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在进行结构的抗震设计时,减隔震已经成为常规的工程技术,并且在强震区的公路桥梁中被广泛采用。现行的规范及规程中有具体的设计步骤,可参见[1],[2],[4],[10],[13],[33]。最近二十余年,美国、日本、土耳其、中国大陆及台湾省发生了多次大地震,其中采用基础隔震的建筑物及桥梁也遭受了破坏,破坏情况可见[6]、[7]、[8]、[9]、[16]、[17]、[20]、[24]、[25]、[26]、[27]、[28]、[29]、[30]、[31]、[32]、[34]、[35]、[36]。研究减隔震结构抗震性能的报告及出版物并不能很明确地说明减隔震技术的优越性,例如,不能够证明减隔震技术在减隔震结构抗震性能中的有效性。一个明显的原因是缺乏实际的工程验证,另一个原因就是缺乏理论基础和设计指导细则。在联邦公路署的资助下,作者和他的同事们对减隔震技术的理论基础以及建立减隔震设计指导原则的假定进行了多年的研究。主要研究内容为罕遇地震作用下阻尼在减隔震设计中所起的作用。本论文主要介绍该研究项目的由来及一些研究成果,主要包括:(1)大震下当前的减隔震设计方法优越性及不足;(2)建议的设计方法,抵御罕遇地震的设计周期窗口;(3)一种新的滚轴减隔震体系,能够有效地提高桥梁抗震性能。
Seismic isolation has become a routine engineering technique in seismic design of structures, and is widely used in highway bridges in strong earthquakes. There are specific design steps in the current codes and procedures, which can be found in [1], [2], [4], [10], [13], [33]. In the recent two decades, there have been many earthquakes in the United States, Japan, Turkey, mainland China and Taiwan Province. Among them, buildings and bridges with base-isolated structures have also been damaged, and damage can be seen [6], [7] [8], [9], [16], [17], [20], [24], [25], [26], [27], [28], [29], [30], [31 ], [32], [34], [35], [36]. The reports and publications on the seismic behavior of seismically isolated structures can not give a clear indication of the superiority of seismically isolated seismograms. For example, the effectiveness of seismically isolated seismics in the seismic behavior of seismically isolated structures can not be demonstrated. One obvious reason is the lack of actual engineering verification, another reason is the lack of theoretical basis and design guidelines. With the help of the Federal Highway Administration, the author and his colleagues have conducted many years of research on the rationale for seismic reduction technology and on the assumption that the guidelines for seismic isolation design should be established. The main research contents are the role of damping in seismic isolation design under rare earthquakes. This paper mainly introduces the origin of the research project and some research results, including: (1) the superiority and deficiency of the current seismic isolation design under major earthquake; (2) the proposed design method to resist the design cycle of rare earthquake Window; (3) A new roll reduction system, which can effectively improve the seismic performance of bridges.