Study on Steel Moment Resisting Frame incorporating with Lead Damper into Beam Splice

为了在地震条件下建立钢结构的无损伤体系，提出了在梁接头处加入先进的铅阻尼器的方法。通过典型的梁柱组合进行了验证方法的试验，并对阻尼器的动力特性和组合的整体响应特性进行了测试。从试验结果中，可得出以下结论。提出了将铅阻尼器引入梁接头的结构细节，并通过实验验证了其实用性。采用两种不同化学成分的铅材料，分别进行了正弦激励试验和随机激励试验，考察了激励频率和重复加载次数对阻力的影响。正弦激励试验结果表明，尽管材料不同，阻尼器的抗力-变形关系稳定，不受激励频率和至少90次重复加载次数的影响。结果表明，在最大约4mm的挠度范围内，磁滞回线呈平行四边形。再次证实，在随机激励下，阻尼器在最大约4mm的变形范围内可以稳定响应。人们已经认识到，阻尼器对小到中等量级的激励也相当敏感。通过对比两种铅材料的试验结果，认为含锑铅合金阻尼器在保证必要强度的同时，可以减小结构的横向漂移。

In order to establish damage free system of steel structure in the event of earthquakes, a method to incorporate a developed lead damper into the beam splice has been proposed. The test for verifying the method has been carried out by using typical beam-column subassemblage, and the dynamic properties of the damper and the overall response characteristics of the subassemblage have been examined. From the test result, the following conclusions have been drawn.1.The structural detail to incorporate the lead damper into the beam splice is presented, and the practical usability can be confirmed by the experiment.2.The sinusoidal excitation tests, as well as the random excitation tests, has been performed in order to examine the effects of excitation frequency and the number of repetitive loading cycles on the resisting force, using two kinds of materials of lead with different chemical compositions. From the result of the sinusoidal excitation tests, it has been made clear that the resisting force-deformation relation of the damper is stable, without the influence of excitation frequency and the number of repetitive loadings of at least 90 cycles, in spite of the difference of materials. It has been shown that the hysteresis loop has the shape of parallelogram within the region of the deflection amplitude up to about 4 mm.3.Again, it has been also confirmed that the damper can respond stably within the deformation range of the damper up to about 4 mm, under random excitation. It has been recognized that the damper is quite sensitive against the excitations even with small to moderate magnitudes.4.After comparing the test results between two kinds of materials of lead, it has been recognized that the damper using lead alloy with antimony content is preferable to secure necessary strength and at the same time, to lessen the lateral drift of the structure.