摘要
箱形截面钢桥墩广泛地用于高架桥中 ,通常 ,这些箱形截面的钢板具有较高的宽厚比 ,这就使得桥墩在大地震时很容易遭到破坏。为了改善这种钢桥墩的抗震性能 ,提出了一种通过能量被局部构件吸收的方法来提高整个结构的抗震能力 ,即把地震灾害控制在一些事先设计好的薄弱构件中 ,地震时 ,通过这些构件的破坏来吸收能量。在研究中 ,粘附于钢桥墩的低屈服点钢板被设计为薄弱构件 ,在地震时 ,通过低屈服点钢板的屈服来吸收能量 ,并保持桥墩一直为弹性。研究了低屈服点钢板的耗能特性 ,并提出了优化设计方法。这种新的设计概念及方法同样适合于房屋、厂房及高耸结构抗震设计。
Bridge piers with steel hollow box sections are widely used for highway bridges,which are designed with high width thickness ratios of component plates.This makes them susceptible to damage during severe earthquakes.In order to improve the seismic performance,an energy absorption strategy which localizes damage in structural systems is proposed:concentrating damage in specially designed weak structural elements,with which energy is absorbed during earthquake.Here,low yield point steel(LYPS)plates attached to steel pier are employed as the weak elements.In case of earthquake events,LYPS plates yield to absorb energy and keep the main structure always elastic.The paper studied the energy absorption performance of LYPS plates,and proposed optimal design method.This new design concept is also applicable to the aseismic design of buildings,factories and tall structures.
出处
《四川建筑科学研究》
2001年第3期26-29,共4页
Sichuan Building Science
关键词
箱形钢桥墩
能量吸收
优化设计
抗震结构
box steel pier
low yield point steel
energy dissipation
optimal design
