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斜交网筒结构具有较大的抗侧刚度,但其延性较差,通过设置屈曲约束支撑可改善斜交网筒结构延性。以30层的斜交网筒结构模型为研究对象,分别对普通斜交网筒结构和设置屈曲约束支撑斜交网筒结构进行静力弹塑性推覆(Pushover)分析。结果表明:屈曲约束支撑可有效改善斜交网筒结构延性。此外,对立面中部、立面角部、底部楼层、上部楼层共4种局部区域布置屈曲约束支撑的方案进行了结构延性分析。局部设置屈曲约束支撑斜交网筒结构的设计应确保斜柱处于弹性工作状态,屈曲约束支撑率先进入塑性耗能状态。建议采用立面中部布置屈曲约束支撑的方案,可实现在保证结构受剪承载力的前提下,较好地改善斜交网筒结构的延性,避免结构发生脆性破坏。
The skewed web structure has larger lateral stiffness, but its ductility is poor. The ductility of the skewed web structure can be improved by providing buckling restraint support. Taking the 30-story skewed web structure model as the research object, the static elastoplastic pushover analysis of ordinary skewed web structure and buckled web structure with buckling restraint was carried out respectively. The results show that buckling restrained brace can effectively improve the ductility of skewed web tube structure. In addition, the structural ductility analysis was carried out on the schemes of placing buckling restrained bracing in four kinds of local areas, namely the central part of the facade, the corner of the facade, the bottom floor and the upper floor. Partial design of buckling restraint brace The design of skewed web tube structure should ensure that the inclined column is in elastic working condition, and the buckling restraining support rate first enters the plastic energy dissipating state. It is suggested that the plan of buckling restraint support should be adopted in the central part of the facade, so that the ductility of the skewed web structure can be improved and the brittle failure of the structure can be avoided under the premise of ensuring the shear capacity of the structure.