Seismic performance of energy-dissipating post-tensioned CLT shear wall structures II: Dynamic analysis and dissipater comparison
Seismic performance of energy-dissipating post-tensioned CLT shear wall structures II: Dynamic analysis and dissipater comparison
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DOI：
10.1016/j.soildyn.2019.105980
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发表时间：
2020-03
影响因子：
4
通讯作者：
Xiaofeng Sun;Minjuan He;Zheng Li;F. Lam
中科院分区：
文献类型：
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作者：
Xiaofeng Sun;Minjuan He;Zheng Li;F. Lam
本文描述的工作是在基于性能的抗震评估框架内进行的，这两种结构都是后张法(PT)CLT剪力墙结构，带有UFP消能器(PT-STRS-U)或摩擦消能器(PT-STRS-F)。本文(第二部分工作)对PT-STRS-U和PT-STRS-F的结构设计方法、结构模型、抗震性能评估和震后损失评估进行了较为广泛的研究。在以前的研究中(工作的第一部分)，PT CLT剪力墙的设计能力和设置消能器的相应参数都得到了提供。利用这些数据，采用直接基于位移的设计(DDD)程序设计了一个8层的PT-Str-U和一个8层的PT-Str-F。在OpenSees中还为这两种结构开发了简化的结构模型。采用Pushover和时程动力分析方法，在DDD程序的设计目标范围内，对计算得到的结构性能目标进行校核。最后，基于标定的结构模型，利用易损性曲线对PT-Str-U和PT-Str-F的抗震性能进行了评估。震后损失评估还包括消能工的层间位移、绝对楼层加速度和剪切变形。总体而言，在地震作用下，PT-Str-U的最大层间位移与PT-Str-F的最大层间位移相似。在大多数情况下，摩擦消能器比UFP消能器在减小结构的绝对响应加速度方面表现得更好。在考虑结构的震后总损失时，建议采用摩擦耗能器，与UFP耗能器相比，PT-CLT剪力墙结构的震后损失较小。
The work described herein was conducted within the performance-based seismic assessment framework on both post-tensioned (PT) CLT shear wall structures with UFP dissipaters (PT-Strs-U) or with friction dissipaters (PT-Strs-F). In this paper (Part II of the work), a more extensive study was conducted for the PT-Strs-U and PT-Strs-F, dealing with structural design method, structural modeling, seismic performance assessment, and post-earthquake loss assessment. In the previous study (Part I of the work), both the design capacities of the PT CLT shear walls and the corresponding parameters of the incorporated dissipaters were provided. Using these data, a direct displacement-based design (DDD) procedure was applied for designing both one 8-storey PT-Str-U and one 8-storey PT-Str-F. A simplified structural model was also developed in OpenSees for both structures. Pushover and time-history dynamic analysis were conducted to calibrate the calculated structural performance objectives within the design targets of the DDD procedure. Finally, based on the calibrated structural models, seismic performance of the PT-Str-U and of the PT-Str-F was assessed using the fragility curves. The post-earthquake loss assessment was also conducted afterwards in terms of the inter-storey drift, absolute floor acceleration, and shear deformation of the dissipaters. Overall, the maximum inter-storey drift of the PT-Str-U is similar to that of the PT-Str-F under the earthquakes. In most cases, the friction dissipaters perform better than the UFP dissipaters for mitigating the absolute response accelerations of the structures. When taking the total post-earthquake loss of the structures into account, the friction dissipaters are recommended, which can result in a less post-earthquake loss for the energy-dissipating PT CLT shear wall structure, compared to the UFP dissipaters.