当前位置: X-MOL 学术Structures › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Multiparameter seismic behavior of castellated beam-to-column connections based on stress migration
Structures ( IF 4.1 ) Pub Date : 2020-12-19 , DOI: 10.1016/j.istruc.2020.12.016
Ran Bi , Lianguang Jia , Pengyu Li , Qinghe Wang

This paper presents a study on the castellated beam-to-column connections with four regular hexagonal web openings and one solid web beam-to-column connection that considering the opening rate and whether there is a combination of floor slabs (composite action) while subjected to the cyclic loading. Furthermore, the initial geometric imperfection was carefully incorporated in the FE model and the models have been validated against published experimental results. There is a slightly different about 5% between FE and test results including ultimate bearing capacity and other hysteresis behaviors. Investigation of 38 FE models subjected to cyclic loading focuses in the variation regularity of the failure mode, plastic development, stress migration, and seismic behaviors under the coupling effect of various factors, including the composite action of the floor slab, opening rate, the distance from the first opening to the face of the column, depth-to-thickness ratio of the web, and opening spacing. It is found that the composite action can improve the stress distribution around the first opening and raise the bearing capacity and ductility of the connections to a certain extent. Further, when the opening rate is either smaller than 0.5 or higher than 0.7, the plastic hinge of the connections with the floor slab occurs at the beam-to-column connection weld, which is completely different from the failure mode that without composite action. When the distance from the first opening to the face of the column is equal to or greater than 1.375 times the depth of beam, the plastic hinge formed in the beam-to-column weld while the composite action is taken into account; when disregarding the composite action causes the plastic hinge emerged in the beam section. Also, the ultimate bearing capacity of the castellated beam-to-column connections with closely spaced web openings significantly decreases; however, widely spaced web openings make stress concentration around the first opening and hinder the migration of stress to other openings, which has an adverse effect on the ultimate bearing capacity and ductility of the connections. The depth-to-thickness ratio of the web is also an important factor affecting the damage mode either web buckling or beam plastic hinge.



中文翻译:

基于应力迁移的带孔梁-柱连接的多参数地震行为

本文针对具有四个规则的六边形腹板开口和一个实心腹板的梁到柱连接的cast形梁到柱连接进行了研究,该研究考虑了开口率以及是否承受楼板的组合(复合作用)周期性加载。此外,最初的几何缺陷已被仔细地纳入有限元模型,并且已针对已发表的实验结果对模型进行了验证。FE和测试结果(包括极限承载力和其他滞后行为)之间的差异略有大约5%。对38种承受周期性载荷的有限元模型的研究重点是在各种因素的耦合作用下,破坏模式的变化规律,塑性发展,应力迁移和地震行为,包括楼板的复合作用,开孔率,从第一个开孔到立柱表面的距离,腹板的深厚比以及开孔间距。发现复合作用可以在一定程度上改善第一开口周围的应力分布,并在一定程度上提高接头的承载能力和延展性。此外,当打开率小于0.5或大于0.7时,与楼板的连接处的塑料铰链会在梁柱连接焊缝处发生,这与没有复合作用的破坏模式完全不同。当从第一个开口到圆柱面的距离等于或大于光束深度的1.375倍时,考虑到复合作用时,在梁对柱焊缝中形成的塑料铰链;当忽略复合作用时,会导致塑料铰链出现在梁段中。同样,腹板间距很小的带腹板梁到柱连接的极限承载力也会大大降低;然而,间隔较大的腹板开口使应力集中在第一个开口周围,并阻碍了应力向其他开口的迁移,这对连接的最终承载力和延展性产生不利影响。腹板的深厚比也是影响腹板屈曲或梁塑料铰链损坏方式的重要因素。腹板间距较小的带腹板梁到柱连接的极限承载力显着降低;然而,间隔较大的腹板开口使应力集中在第一个开口周围,并阻碍了应力向其他开口的迁移,这对连接的最终承载力和延展性产生不利影响。腹板的深厚比也是影响腹板屈曲或梁塑料铰链损坏方式的重要因素。腹板间距较小的带腹板梁到柱连接的极限承载力显着降低;然而,间隔较大的腹板开口使应力集中在第一个开口周围,并阻碍了应力向其他开口的迁移,这对连接的最终承载力和延展性产生不利影响。腹板的深厚比也是影响腹板屈曲或梁塑料铰链损坏方式的重要因素。

更新日期:2020-12-20
down
wechat
bug