Analysis of the second-order effect on the Mega-Sub Controlled Structure System under rare earthquake

作者：Wu Hao^*; Zhang Xun'an; Li Tao

来源：Journal of Northwestern Polytechnical University, 2011, 29(2): 277-282.

• Adverse effect
• Controlled structures
• Elasto-plastic
• Finite element analysis
• Finite element models
• Finite element software
• Internal forces
• Mega columns
• Mega-Sub Controlled Structure System (MSCSS)
• Plastic hinges
• Second order effect
• Sub-structures
• Time history analysis
• Wave excitation

The finite element software SAP2000 was employed to establish the finite element model of Mega-Sub Controlled Structure System (MSCSS), and the elasto-plastic time history analysis considering the second-order effect of MSCSS under rare earthquake was carried out. The second-order effect on plastic hinge distribution, structural elasto-plastic story drift and structural internal force was analyzed by comparing with the structure without considering the second-order effect. The results show that: (1)the law of plastic hinge distribution considering the second-order effect is different when we choose different seismic wave excitation; (2)the second-order effect on story drift of second sub-structure is more and more adverse with the increase in floor and the most adverse effect is 6.4%; (3)the bending moment of mega column and second sub-structure beam is adversely affected by the second-order effect, the maximum increase in the amplitude of bending moment is 7.2% for mega column and 7.4% for sub-structure beam. Therefore, the second-order effect must be considered when the MSCSS elasto-plastic response under rare earthquake is analyzed.

• 出版日期2011
• 单位西北工业大学