STUDY ON THE ENERGY DISTRIBUTION AND COLLAPSE-RESISTANT CAPACITY OF RC FRAMES WITH NONLINEAR VISCOUS DAMPERS
Structural collapse-resistant capacity under severe or mega earthquakes plays a very important part in the structure seismic design.It is shown by amounts of seismic damage investigation results that the concentration of cumulative hysteretic energy distribution in the weak story is almost inevitable in ordinary reinforced concrete (RC) frames under severe or mega earthquakes,leading to the collapse of those structures.Nonlinear viscous fluid damper,as a type of energy dissipation device to reduce the structural seismic responses,has been widely used in many practical engineering cases.This type of damper has good ability of dissipating input energy by earthquake without changing the stiffness of the original structure.Ordinary multi-story RC frames without dampers as well as those with nonlinear viscous fluid dampers are designed based on current Chinese seismic design code for building structures.Then the collapse-resistant capacities and safety margins against collapse are quantitatively evaluated,with collapse fragility analysis based on au incremental dynamic analysis (IDA).And also the cumulative hysteretic energy distribution modes of the two types of structures are compared based on the numerical results.The analysis results show that damage degrees of the frame beams and colunms are significantly decreased in the flames with dampers than the ordinary frames under the same strong earthquakes.Besieds,the distribution mode of the cumulative hysteretic energy is much easier to control to avoid the appearance of energy concentration in the weak story for the frames with dampers than the ordinary ones,which reduces the collanse possibilities of the structures remarkably.
Collapse-resistant capacity RC framestructure cumulative hysteretic energy nonlinear viscous damper incremental dynamic analysis
Zhiwei Miao Zhaoyun Qiu Aiqun Li
School of Civil Engineering, Key Laboratory of Concrete and Prestressed Concrete Structures of China Education Ministry, Southeast University, SiPaiLou 2, Nanjing 210096, P.R.China
国际会议
The Twelfth International Symposium on Structural Engineering (第十二届结构工程国际研讨会)
武汉
英文
376-381
2012-11-17（万方平台首次上网日期，不代表论文的发表时间）