Seismic performance of energy-dissipating post-tensioned CLT shear wall structures I: Shear wall modeling and design procedure
Seismic performance of energy-dissipating post-tensioned CLT shear wall structures I: Shear wall modeling and design procedure
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DOI：
10.1016/j.soildyn.2019.106022
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发表时间：
2020-04
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
本文所述的工作是在基于性能的地震评估框架下对后张（PT） CLT剪力墙结构进行的，该结构具有UFP消散器（PT- strs - u）和摩擦消散器（PT- strs - f）。在本文（本工作的第一部分）中，开发了具有UFP耗散器（PT-Walls-U）或摩擦耗散器（PT-Walls-F）的后张CLT剪力墙预测模型的建模方法。基于校正耗散模型和预测剪力墙模型，提出了耗散PT CLT剪力墙的设计流程。给定目标剪力墙性能，它将能够确定所需的耗散器的机械性能。在此设计过程中，对PT-Walls-U和PT-Walls-F进行了系统的参数分析，同时改变了变量（即初始后张紧力、标称股径和壁高宽比）。分别获得了剪力墙的分析性能和所采用的消耗能器所要求的力学性能。最后，给出了墙体承载力估算公式。校正后的纯PT- CLT剪力墙模型和耗散模型可根据上述预测模型估计相应耗能PT- CLT剪力墙的滞回曲线。随着初始PT力的增大或墙体高宽比的增大，剪力墙承载力的增强比钢绞线直径的增大更为显著。基于方程的剪力墙承载力与预测模型的解析剪力墙承载力基本一致。总的来说，耗能PT CLT剪力墙的预测模型和提出的设计程序为墙体承载力和所需的耗能性能提供了可靠和有价值的数据。它们将用于本工作第二部分中进行的耗能PT CLT剪力墙结构的设计和建模。
This work described herein was conducted within performance-based seismic assessment framework on post-tensioned (PT) CLT shear wall structures with UFP dissipaters (PT-Strs-U) and that with friction dissipaters (PT-Strs-F). In this paper (Part I of this work), a modeling method for the predictive models of post-tensioned CLT shear walls with either UFP dissipaters (PT-Walls-U) or friction dissipaters (PT-Walls-F) was developed. Furthermore, based on both the calibrated dissipater model and the predictive shear wall model, a design procedure for the energy-dissipating PT CLT shear walls was also proposed. Given a target shear wall performance, it will be able to determine the required mechanical properties of the dissipaters. With this design procedure, systematic parametric analysis on both the PT-Walls-U and the PT-Walls-F was conducted, while changing the variables (i.e., initial post-tensioning force, nominal strand diameters, and wall height-to-width ratios). The analytical performance of each shear wall and the required mechanical properties of the adopted dissipaters were respectively obtained. Finally, the equations for the wall capacity estimation were also provided. The calibrated PT-only CLT shear wall model and the dissipater model can be used to estimate the hysteretic curve of the corresponding energy-dissipating PT CLT shear wall based on the aforementioned predictive model. The enhancement of the shear wall capacity is more significant with an increase of the initial PT force or the wall height-to-width ratio compared to an increase of the strand diameter. The equation-based shear wall capacity is in agreement with the analytical shear wall capacity from the predictive model. Overall, the predictive model of the energy-dissipating PT CLT shear walls and the proposed design procedure have led to reliable and valuable data for both the wall capacity and the required dissipater properties. They will be used for designing and modeling the energy-dissipating PT CLT shear wall structures conducted in the Part II of this work.