On-line Test of Steel Structures subjected to Wind Load

由于最近的趋势，其中已经增加了容易被风力振动的结构的建造，抗风设计已经变得更加重要。由于目前对非弹性结构风响应的认识还存在许多不清楚的地方，设计时考虑了结构框架在最大设计风速下的弹性行为。然而，考虑到外力的不确定性，结构很可能会受到超过设计速度的风速，即使这种机会很小。因此，研究结构的极限抗力，需要得到结构在风荷载作用下的非弹性响应特性。当风振非弹性响应的特性被阐明后，可以考虑在考虑非弹性响应的情况下，基于极限强度的抗风设计的可能性 ...更多信息 帐户.在非弹性反应阶段，由于结构的等效自振周期变长，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，框架在非弹性响应期间吸收塑性能量。因此，可以通过限制结构的塑性程度来获得结构的稳定响应特性。本文旨在通过在线风振响应试验研究钢结构的非弹性风振响应。研究结果表明：（1）顺风向风荷载作用下，由于平均风荷载的存在，结构一侧的塑性变形逐渐累积。对于横风向风振响应，两侧均发生塑性变形。(2)响应实验的结果相当好地对应于从本研究中使用的响应分析所获得的那些。(3)在适当设置塑性刚度的情况下，可以采用双线性型恢复力特性模型进行顺风向响应的计算分析。(4)用双线性型恢复力特性模型分析时，不能估计横风向响应。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