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采用基于能量概念的简化公式确定自复位预应力预制框架(PTED)结构的目标位移。建立PTED结构的有限元分析模型,对PTED结构进行静力弹塑性分析,验证大震下结构的层间位移角,梁、柱连接处及柱底转动能力能否满足规范要求。探讨PTED结构中梁的伸长效应及底层柱纵筋取值对结构受力性能的影响。研究结果表明:结构的最大层间位移角,梁、柱连接处的转角及柱底塑性铰满足大震下的变形要求,结构为梁铰耗能机制、抗震性能良好。梁伸长对梁、柱的局部受力性能影响较大,但对框架结构整体性能影响不大。在结构设计中应合理估计底层柱纵筋面积,以期得到较优的抗震性能。
A simplified formula based on the concept of energy was used to determine the target displacement of a self-restoring prestressed frame (PTED) structure. The finite element analysis model of PTED structure is established. The static elasto-plastic analysis of PTED structure is carried out to verify whether the interlayer displacement angle, the connection between beam and column and the rotation ability of column bottom under large earthquake can meet the specifications. The effect of beam elongation and the value of longitudinal reinforcement in the PTED structure on the mechanical behavior of the structure were investigated. The results show that the maximum interlayer displacement angle of the structure, the corner of the connection between the beam and the column and the plastic hinges at the bottom of the column satisfy the deformation requirements under large earthquake. The structure is the energy dissipation mechanism of the beam hinge and the seismic performance is good. The beam elongation has a great influence on the local stress performance of beams and columns, but has little effect on the overall performance of the frame structure. In the structural design should be reasonable to estimate the length of the bottom column longitudinal reinforcement, in order to get better seismic performance.