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防屈曲支撑通常采用刚接节点与框架结构相连,而内核构件端部构造形式复杂,常出现外伸屈服段与加强段等,端部构造形式复杂,由此形成的复杂边界约束条件将对防屈曲支撑的整体性能产生显著影响。通过理论推导与有限元分析,对两端刚接边界条件下端部构造形式对防屈曲支撑整体受力性能的影响进行了研究。研究表明:相比于铰接边界条件,刚接边界条件能有效防止外伸段发生过大的侧向变形,两端刚接防屈曲支撑比两端铰接防屈曲支撑表现出更好的受力性能,即使在实际框架结构中防屈曲支撑两端出现转角时亦然。基于理论推导与有限元分析,提出了内核构件端部段的简化计算模型,采用迭代算法,可用于近似确定内核构件端部外伸段转角及变形在外围约束构件两端产生的不利附加偏心距;框架结构中防屈曲支撑两端转角不同,可用等效附加偏心距系数将两端不等附加偏心距的情况等效为两端等附加偏心距的情况;考虑等效附加偏心距的影响,给出了适用于两端刚接防屈曲支撑的整体设计方法。
The buckling brace is usually connected to the frame structure by the just-connected node. However, the structure of the end of the core member is complex, often with the overturning yielding and strengthening, etc., and the complicated structure of the end structure. The overall performance of buckling has a significant effect. Through theoretical derivation and finite element analysis, the influence of the end structures under the rigid-body boundary conditions on the overall mechanical performance of buckling-restrained brace is studied. The results show that, compared with the boundary conditions, the boundary conditions can effectively prevent the lateral deformation of the overhang, and the buckling strength at the two ends of the joint is better than that at both ends. , Even when cornering occurs at both ends of the buckling brace in the actual frame structure. Based on theoretical derivation and finite element analysis, a simplified computational model of the end segment of the core member is proposed. An iterative algorithm can be used to approximately determine the unfavorable additional eccentricity at the extremity segment of the core member, In the frame structure, the angles of anti-buckling support at both ends are different. Equivalent additional eccentricity coefficient can be used to equalize the additional eccentricity at both ends to the equivalent eccentricity at both ends. Considering the effect of equivalent additional eccentricity, The overall design method for buckling brace with both ends just connected is given.