Jin Ling Institute of Technology, Nanjiang, China.
Chongqing Three Gorges University, Chongqing, China.
PLoS One. 2021 Feb 19;16(2):e0246439. doi: 10.1371/journal.pone.0246439. eCollection 2021.
The plastic hinge is a key factor in the ductile and plastic design of structures and an important basis for the seismic strengthening of structures. The formation and behavior of plastic hinges is critical for the seismic performance of an entire structure. The relocation of plastic hinges away from the beam end is an effective way of addressing brittle failure. In this paper, the cause of the shear buckling failure of prefabricated steel beams with corrugated webs and the strain variation at the flanges of steel beams are theoretically analyzed through structural tests. Based on the analysis results, a local strengthening method is proposed, and the effects of the beam sizes and the strengthening steel plate on the plastic hinges are obtained. In addition, a calculation method for determining the size of the strengthening steel plate that promotes the relocation of the plastic zone away from the beam end is given, a design method for plastic hinge relocation is proposed based on the test data, and its validity is verified.
塑性铰是结构延性和塑性设计的关键因素，也是结构抗震加固的重要依据。塑性铰的形成和行为对整个结构的抗震性能至关重要。将塑性铰从梁端移开是避免脆性破坏的有效方法。本文通过结构试验，对波纹腹板预制钢梁的剪切屈曲破坏原因及钢梁翼缘应变变化进行了理论分析。基于分析结果，提出了一种局部加固方法，并得到了梁尺寸和加固钢板对塑性铰的影响。此外，还给出了确定促进塑性区远离梁端的加固钢板尺寸的计算方法，基于试验数据提出了一种塑性铰迁移的设计方法，并验证了其有效性。
