腹板摩擦式自定心预应力混凝土框架基于性能的抗震设计方法

腹板摩擦式自定心预应力混凝土框架可以实现结构在地震作用后的自动复位并减少梁柱节点区的损伤。在已有理论分析和试验研究基础上，对该结构体系的抗震设计方法进行研究。定义结构的抗震性能水准、地震动作用水准和结构的极限状态，确定自定心结构的抗震设计目标。建立自定心框架结构的抗震设计方法，包括梁柱的截面尺寸选择、配筋、预应力和摩擦力的确定等。以1榀4跨6层的腹板摩擦式自定心预应力混凝土框架为例，进行基于性能的抗震设计，并选用7条地震波进行非线性动力时程分析。分析结果表明：应用此方法设计的结构在地震作用下的位移、弯矩、应变等响应与给定的性能设计目标较为一致，验证了方法的有效性，且所设计的结构具有良好的自定心能力和耗能能力。

Performance-based seismic design method of self-centering prestressed concrete frames with web friction devices

The self-centering prestressed concrete (SCPC) frame with web friction devices aims at restoring its original vertical position after a major earthquake and reducing damage at the beam-column panel zone. Based on previous theoretical and experimental studies, a seismic design method for the SCPC frames was investigated. The seismic performance levels, the intensities of ground motions and ultimate limit states were defined, and the objectives of seismic design of SCPC frames were determined. Thereafter, the design method was proposed, including the selection of beam/column cross-sections, reinforcement arrangements, determination of pre-tensioning and friction forces. Taking a 6-story 4-bay SCPC frame with web friction devices for example, the performance-based seismic design was carried out, and seven earthquake ground motions were selected for nonlinear time-history analyses. It is observed that the calculated responses (i.e., displacements, moments and strains, etc.) of the SCPC frame, designed using the proposed approach, match well with the design performance objectives, demonstrating the effectiveness of the proposed design method. The designed structure shows desirable self-centering and energy dissipation capacity.