On-line Test of Steel Structures subjected to Wind Load

由于最近的一种趋势，建造的结构很容易受到风的摆动，因此抗风设计变得更加重要。由于目前对弹塑性结构风振响应的认识还存在许多不明确的地方，设计时考虑了结构框架在最大设计风速作用下的弹性行为。然而，在考虑外力的不确定性的情况下，结构很可能会受到超过设计风速的影响，即使这种可能性很小。因此，为了研究结构的极限抗力强度，需要得到结构在风荷载作用下的弹塑性反应特性。在弄清风致非弹性反应特性的基础上，可以将考虑非弹性反应的基于极限强度的抗风设计纳入…。更多的帐户。在非弹性响应期间，由于结构的等效固有振动周期变长，输入能量增加。从这个角度来看，可以说结构的非弹性行为是不利的。然而，框架在一段非弹性响应期间吸收了塑性能量。由此推论，可以通过限制塑性程度来获得结构的稳定响应行为。本研究旨在通过进行在线风响应试验来研究钢结构的非弹性风响应。研究结果表明：(1)在顺风向响应方面，由于平均风荷载的作用，塑性变形集中在结构的一侧。对于横风向响应，两侧都发生了塑性变形。(2)响应试验的结果与本文采用的响应分析结果吻合较好。(3)如果塑性刚度设置得足够好，则可以通过双线性恢复力特征模型进行分析来估计顺风向响应。(4)用双线性恢复力特征模型分析不能估计横风向响应。较少

Due to a recent tendency in which there has been an increase in the construction of structures that are easily oscillated by wind forces, a wind resistant design has become more important. Since there are many unclear points in the understanding of wind responses of inelastic structures at present, designs are made considering the conditions where structural frames will behave elastically against the maximum design wind speed. However, under the consideration of the uncertainty of external forces, it may well be that structures will be subject to wind speeds exceeding the design speed even though this chance is small. Therefore, the inelastic response characteristics of structures for wind forces need to be obtained for the investigation into their ultimate resistance strength. When the characteristics of wind-induced inelastic responses are clarified, the possibility of a wind resistant design based on ultimate strength under the consideration of inelastic responses can be taken into … More account. During the period of inelastic responses, the amount of input energy increases due to the fact that the equivalent natural vibration period of structures becomes longer. From this point of view, it can be said that the inelastic behavior of structures is disadvantageous. However, the frames absorb the plastic energy during a period of inelastic responses. Therefore, it is deduced that the stable response behavior of structures can be obtained by restricting the degree of plasticity. This study aims at clarifying the inelastic wind responses of steel structures by carrying out on-line wind response tests. The results obtained from this study can be summarized as follows:(1) With regard to along-wind responses, the plastic deformation accumulated on one side of the structures due to the presence of the mean wind force. As for across-wind responses, the plastic deformation occurs on both sides.(2) The results of the response experiments correspond quite well to those obtained from the response analysis used in this study.(3) The along-wind responses can be estimated by caring out analyses using Bi-linear type restoring force characteristic models if a plastic stiffness is set up adequately.(4) The across-wind responses can not be estimated by analyses made using Bi-linear type restoring force characteristic models. Less