组合节点变形机制和破坏形态的定量评价

节点的变形机制和破坏形态分析是其抗震性能评估的重要内容，但目前缺乏有效的定量评价方法。该文基 于多尺度数值模型，对组合节点变形机制和破坏形态的定量评价方法开展研究。提出采用“变形分量比例图”分 析组合节点的变形机制，该图可根据多尺度模型的位移结果直接计算得到。“变形分量比例图”反映了梁弯曲、 柱弯曲、和节点域剪切三种主要变形分量随层间位移角以及层间位移方向角的变化规律，可直观地揭示组合节点 在任意层间位移方向上的破坏形态。层间位移方向角对空间组合节点的变形机制和破坏形态影响显著，必须利用 “变形分量比例图”全面验算组合节点在任意可能层间位移方向上的破坏形态，并进一步优化设计确保任意可能 地震入射方向上的预期破坏机制。

Quantitative evaluation of deformation mechanism and failure modes for composite joints

For joints, the deformation mechanism and failure modes are essential to assess their seismic performance. However, an effective and quantitative evaluation method is still lacking. The quantitative evaluation method of the deformation mechanism and failure modes of composite joints are investigated on the basis of the previously proposed multi-scale numerical models. The deformation-component-proportion (DCP) diagram, which can be calculated directly from the displacement results of the multi-scale model, is introduced to analyze the deformation mechanism of the composite joints. The proportions of the beam flexure, column flexure and joint core shear deformations in the total deformation corresponding to different story drift angles and different story drift direction angles can be illustrated by the DCP diagram so that the failure mode of the composite joint can be clearly revealed in any possible story drift direction. The story drift direction angle can significantly influence the deformation mechanism and failure modes of the spatial composite joints. Using the DCP diagram, the failure mode should be checked in any possible story drift direction, and then the design can be optimized to make the composite joints achieve the expected failure modes in any possible earthquake incident direction.