为揭示服役性能劣化对装配式空心板桥抗震性能的影响，提出了空心板桥铰缝劣化和材料性能退化的动力分析方法，并结合实例，采用已有试验结果和实体数值模拟对上述分析方法进行了验证，通过非线性时程分析，研究了空心板桥考虑服役劣化的地震损伤破坏模式。研究结果表明：服役劣化导致桥梁上、下部结构相对动力特性发生改变，造成桥梁地震损伤破坏模式的改变，尤其在软土类地震中；服役劣化会增大板端位移及其残余位移，加剧支座的损伤状态，同时也会显著增大墩柱的曲率响应，甚至导致墩柱出现严重的结构性损伤；在软土类地震中，当不考虑服役劣化时，桥梁仅出现位移性震害，但考虑服役劣化后墩柱同时也严重受损。因此，在全寿命抗震设计以及抗震评估和加固中，忽略服役劣化可能导致抗震设计和加固策略失效。
Abstract
To reveal the effects of structural deterioration on the seismic performance of precast voided slab bridges, dynamic analytical methods were proposed for voided slab bridges with damaged joints and deteriorative materials.In combination with an actual bridge, experimental results and solid numerical simulations were used to validate the proposed methods.Nonlinear time history analyses were conducted to investigate the damage and failure modes of voided slab bridge under earthquake excitations considering structural deterioration.The results show that structural deterioration changes the relative dynamic characteristics between the superstructure and the substructure of the bridge, leading to the changes in the damage and failure modes of the bridge, especially under the soil-site ground motions.Structural deterioration increases the displacement and residual displacement responses of slab ends, aggravates the damage states of bearings, and also increases the curvature response of columns significantly and even causes severe structural damage to the columns.In the soil-site ground motions, the bridge only suffers from the displacement damage when the structural deterioration is not incorporated, but suffers both from the displacement damage and the structural damage to the columns when structural deterioration is considered.Therefore, the seismic designs and retrofits may fail without considering structural deterioration in the practices of the life-cycle seismic design, and the seismic assessment and retrofit of existing bridges.
关键词
空心板桥 /
服役劣化 /
损伤状态 /
破坏模式 /
增量动力分析 /
抗震性能
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Key words
voided slab bridges /
structural deterioration /
damage states /
failure modes /
incremental dynamic analysis /
seismic performance
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