建筑抗震设计中结构竖向不规则的限定
摘要：建筑抗震设计中结构竖向不规则是因结构沿竖向布置(如楼层质量、几何尺寸、刚度、强度或几者的组合)，发生突变或不连续而产生，使结构局部产生过大的应力集中或塑性变形集中，导致结构局部薄弱诱发整体损伤甚至倒塌。我国及欧美各国现行设计规范中一般都有结构竖向不规则临界控制极限的定量规定，且特别强调从总体概念设计的角度保证内力或能量竖向传递路径的连续，避免结构楼层屈服机制的产生，避免因局部削弱或突变而产生过大的应力集中或塑性变形集中。
关键词：建筑抗震设计；结构竖向不规则
Abstract: Seismic design is due to the irregular structure of the vertical structure along the vertical layout (such as floor quality, geometry, stiffness, strength, or a combination of several persons), or a combination of several persons
generated to make the structure of local produce excessive the stress concentration or concentration of plastic deformation, resulting in the overall structure of the local weak induced damage and even collapse. Quantitative requirements of Europe and the United States to the current design specifications are generally irregular vertical structure of the critical control limits, and special emphasis on conceptual design from the perspective of the overall internal force or energy to ensure continuous vertical transmission path, to avoid structural floor yielding mechanism , to avoid weakening or mutations localized excessive concentration of stress or plastic deformation concentrated. Key words: seismic design of buildings; irregular vertical structure
地震地面运动作用下，建筑物的损伤破坏首先会出现在结构侧向抗震系统的薄弱部位，薄弱部位的损伤破坏会进一步加剧结构抗震性能的退化，从而导致结构整体的倒塌。建筑物的薄弱部位主要来源于结构配置的缺陷或不规则，如结构或构件不规则的几何尺寸、软弱的楼层、质量过分集中以及不连续的侧向抗震系统等。
1.结构竖向不规则的内容
1.1强度分布不规则
结构的楼层强度(楼层屈服承载力)是指给定楼层在所考虑的水平地震作用方向上，抗侧力系统所有单元的受剪承载力总和。强度不连续楼层通常也称为“弱层”。主要由于抗侧力单元(柱或剪力墙等)偏小的截面尺寸或纵向配筋不够等因素而产生的相邻上、下楼层抗侧强度的差异。“弱层”容易引起结构的弹塑性行为集中，改变结构位移分布模式，而导致结构局部或整体的不稳定或倒塌。通常较
建筑抗震设计中结构竖向不规则的限定
