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在抗震建筑工程实践中,隔震基础得到了日益广泛的推广和应用。采用这种基础建成的房屋,在国内外都有很多,比如在堪察加、北贝加尔、阿什哈巴德、纳沃,以及在日本、南斯拉夫等。 但是关于这种基础的参数(如弹性特性、阻尼特性和运动特征等)的确定问题,到目前为止还没有一个统一的解决方法。比如隔震基础房屋的振动周期,目前的建议取值从1s到5s;而在干摩擦阻尼器中的摩擦系数K_(TP2)其建议的取值从0.08(及更小)到0.4(见表1)。通过分析表明,上述这些建议取值彼此间之所以有如此大的差异,主要是由于其所采用的计算地震作用是根据不同的标准来给出的。 在已有的文献中,为了保证计算的地震作用与真实的地震作用相符合,提出了三种解决方法,即(1)采用简单的时间过程表示的合成加速度曲线进行计算。(2)采用随机过程模拟的加速度曲线来计算;(3)应用真实的加速度曲线族来计算。 最简单的正弦衰减形式的合成加速度曲线,已由科尔钦斯基提出来了。但计算加速度曲线上的能量集中在一种优势频率上。这将导致建筑物的计算内力偏高。
In the seismic construction engineering practice, the base of earthquake isolation has been increasingly popularized and applied. Houses constructed on this basis have many domestic and foreign homes, such as in Kamchatka, North Baikal, Ashgabat, and Navo, as well as Japan and Yugoslavia. However, there has not been a unified solution to the problem of determining such basic parameters (such as elasticity, damping, and motion characteristics). For example, the vibration period of a shock-absorbing foundation house, the current recommended value ranges from 1s to 5s; and in the dry friction damper, the friction coefficient K_(TP2) is recommended to be from 0.08 (and less) to 0.4 (see table 1). Through analysis, it is shown that the reason why these proposed values are so different from each other is mainly due to the fact that the seismic actions they use are based on different criteria. In the existing literature, in order to ensure that the calculated earthquake action is consistent with the real earthquake action, three solutions are proposed, namely (1) Computation of the resultant acceleration curve represented by a simple time course. (2) Compute the acceleration curve simulated by the random process; (3) Apply the real acceleration curve family to calculate. The simplest sine decay form of the resultant acceleration curve has been proposed by Kirchnitzky. However, the energy on the calculated acceleration curve is concentrated on a dominant frequency. This will lead to a higher calculation internal force of the building.