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交叉層積木數值模擬研究以及連接損傷分析

Numerical simulation study and damage analysis of cross laminated timber connections

  • 摘要: 木建筑由于結構冗余性以及釘接節點超強的吸能耗能能力在抗震中表現良好.交叉層積木是一種新型的建筑材料.本文以交叉層積木3種柔性連接試驗為基礎,采用Open Sees中Pinching4自定義模型模擬連接滯回曲線的高度非線性、強度退化、剛度退化和捏攏現象.基于主次半循環累積能量的損傷模型,對交叉層積木連接進行損傷分析,并提出該連接的5種性能水平的損傷指數.Pinching4模型與連接試驗結果吻合較好,進一步證明該模型模擬木節點連接性能的可行性和有效性.損傷因子對應的損傷程度基本符合試驗規律,其平均值在合理范圍內,計算結果離散性較低.

     

    Abstract: Due to structural redundancy,strong energy absorption and energy dissipation capacity of nail joints,wood buildings behave good seismic performance in earthquakes. Cross laminated timber is a new generation of engineered wood-based product. Based on tests of three kinds of cross laminated timber connections,Pinching4 model in Open Sees as a user-defined element is applied to simulate the hysteresis response of the connections,which is highly nonlinear,strength degradation,stiffness degradation,and pinching. The primary and follower half-cycle energy damage model is used for damage quantitative analysis of the connections,and the damage factor ranges corresponding to five damage levels of cross laminated timber connections are given in this article. The study shows that good simulation results are obtained and it is also illustrated that Pinching4 model is valid and feasible to predict the hysteretic response of wood connections. Different damage factors responding to varied damage degrees are consistent with the experimental rules. The dispersion degrees of the damage factors are relatively low with the mean values in the reasonable ranges.

     

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