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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Seismic resistance capacity of beam-column connections in high-rise buildings: E-Defense shaking table test
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Seismic resistance capacity of beam-column connections in high-rise buildings: E-Defense shaking table test

机译：高层建筑梁柱连接的抗震能力：电子防御振动台试验

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摘要

A series of E-Defense shaking table tests are conducted on a large-scale test specimen that represents a high-rise steel building. Two types of connections featuring the connection details commonly used in 1970s, in the early days of high-rise construction in Japan, are adopted: the field-welded connection consisting of welded unreinforced flanges and a bolted web type, and the shop-welded connection in which the flanges and web are all-welded to the column flange in the shop. To examine the seismic capacity of a total of 24 beam-to-column connections of the specimen, particularly when it is subjected to long-period ground motion characterized not so much by large amplitude as by very many cycles of repeated loading, the test specimen is shaken repeatedly until the connections fractured. The test results indicate that a few of the field-welded connections fractured from the bottom flange weld boundary in a relatively small cumulative rotation primarily due to the difficulties in ensuring the welding and inspection performance in the actual field welding. The shop-welded connections are able to sustain many cycles of plastic rotation, with an averaged cumulative plastic rotation of 0.86 rad. Two shop-welded connections exhibit ductile fractures but only after experiencing many cycles. The presence of RC floor slabs promotes the strain concentration at the toe of the weld access hole in the bottom flange by at least twice compared with the case without the slab, which had resulted in a decrease in the cumulative plastic rotation by about 50%.
机译：在代表高层钢结构建筑的大型测试样本上进行了一系列E-Defense振动台测试。在日本的高层建筑的早期，采用了两种类型的连接件，它们具有1970年代常用的连接详细信息：一种是由焊接的非加强法兰和螺栓腹板型组成的现场焊接连接，一种是由工厂焊接的连接法兰和腹板全部焊接到车间的立柱法兰上。为了检查样本的总共24个梁到柱连接的抗震能力，特别是当样本经受长时间的地震动时，其振幅不大，而反复加载的周期却很多，因此该样本反复摇动，直到连接破裂。测试结果表明，一些现场焊接连接在相对较小的累积旋转中从底部法兰焊接边界破裂，这主要是由于难以确保实际现场焊接中的焊接和检查性能。工厂焊接的连接能够承受许多次塑料旋转循环，平均累积塑料旋转为0.86 rad。两个车间焊接的连接仅在经历多次循环之后才显示出韧性断裂。与没有楼板的情况相比，RC楼板的存在将底部法兰中的焊接通道孔的趾部处的应变集中提高了至少两倍，这导致累积塑性旋转降低了约50％。

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