论文部分内容阅读
刚度退化的单自由度体系是考虑.P-δ影响的一类结构物的数学模型。本文对这种体系在美国记录的41条和中国记录的12条地面加速度记录的激励下的倒塌情况进行了研究;对导致具有若干种参数的结构物倒塌的最小激发强度进行了计算.从计算的结果可以看出,持续时间对结构物的倒塌起着重要作用。强烈地而运动加速度均方根(RMS)和持续时间是两个刻划结构物倒塌严重性的合适参数。本文建议可把它们用作要求在大地震下不倒塌的结构物的设计依据,并且给出了导致结构物倒塌的最小无量纲RMS强度和持续时间之间的关系。最大地面加速度和持续时间一起也能用来识别倒塌现象。本文推荐了三个不同的最大地面无量纲加速度强度值,分别对应于短的、中等的、长的持续时间,认为在它们激励下结构物倒塌的百分比是可以接受的。
The stiffness-degraded single-degree-of-freedom system is a mathematical model that considers the effects of P-δ. This paper investigates the collapse of this system under the excitation of 41 records in the United States and 12 records of ground acceleration recorded in China; it calculates the minimum excitation strength that causes structural collapse with several parameters. The results can be seen that the duration plays an important role in the collapse of the structure. Strong and rms acceleration and root mean square (RMS) are suitable parameters for the severity of the collapse of two structures. This paper suggests that they can be used as a design basis for structures that do not collapse under large earthquakes and that the relationship between the minimum dimensionless RMS intensity and duration that results in structural collapse is given. The maximum ground acceleration and duration together can also be used to identify collapses. Three different maximum groundless dimensionless acceleration values are recommended in this paper, corresponding to short, medium, and long durations, respectively, and it is believed that the percentage of structure collapse under their excitation is acceptable.