摘要
作为安全的一部分,鲁棒性要求结构在偶然局部损伤情况下不产生与损伤起因不相称的破坏。本文重点是结构鲁棒性评价和实现策略。按照能量观点,结构单元在完全破坏之前应充分吸收或消耗能量。在此基础上,结合结构实际设计能力提出一个新的鲁棒性指标,并以混凝土受弯构件为例作了说明。算例表明该指标能够反映结构破坏过程中的消能能力和对损伤的容纳程度。分析了四种典型材料性能下鲁棒性指标和构件极限应变与屈服应变比值之间的关系。最后,探讨了鲁棒性的实现策略,以期为重点结构及生命线工程减灾提供参考。
As an essential part of structural safety,robustness is required in structures to maintain their overall stability under accidental damage.The paper focused on the appraisal and achievement of structural robustness.From the viewpoint of energy,structural elements shall be capable of absorbing inputs of energy adequately prior to failure.Following this conception,a robustness index is proposed which takes the actual design capacity of a structure into account.Flexural members are adopted for illustrative purpose.It is shown that the energy and damage a structure absorbs before failing entirely failure can be reflected.Furthermore,the relationships between the robustness index and the ratio of ultimate strain to yield strain of four typical materials are defined.Finally,several features to ensure robustness are proposed which should be potentially of use in disaster mitigation of major structures and lifeline engineering.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2007年第S1期269-273,共5页
Journal of Building Structures
关键词
安全
结构鲁棒性
偶然损伤
能量
受弯构件
safety
structural robustness
accidental damage
energy
flexural member
