型钢混凝土梁柱节点损伤模型研究  

Damage Model of Steel Reinforced Concrete Beam Column Joints

作　　者：段熙宾[1] DUAN Xibin(China Railway First Survey and Design Institute Co.,Ltd.,Xi'an 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《铁道标准设计》2022年第7期126-131,共6页Railway Standard Design

基　　金：中铁第一勘察设计院集团有限公司科研开发项目(院科20-58)。

摘　　要：目前,型钢混凝土(Steel Reinforced concrete, SRC)梁柱节点的损伤性评估暂无确定指标,无法对其震后损伤程度进行数字化直观分析。基于国内外典型SRC梁柱节点试验数据,采用修正Park-Ang损伤模型,引入梁柱截面高度比、轴压比、梁柱型钢含钢率、梁柱配筋率组合系数影响,通过多变量参数非线性回归分析得到组合系数的拟合关系式,并给出用于判定SRC梁柱节点构件损伤程度的组合系数经验值,修正后模型与初始Park-Ang混凝土构件损伤模型相比,离散性更小、精度更高,更适应于SRC梁柱节点构件。同时,为满足“小震不坏、中震可修和大震不倒”三水准结构抗震性能水平,根据SRC梁柱节点的特征值将其性能划分为正常运行、生命安全和临近倒塌3种状态,并将其损伤临界值分别定义为0.1、0.55和0.95。At present, there is no definite index for damage assessment of steel reinforced concrete(Steel Reinforced Concrete, SRC) beam-column joints, and the damage degree after earthquake can’t be analyzed digitally and intuitively. Therefore, based on the test data of typical SRC beam-column joints at home and abroad, the modified Park-Ang damage model is adopted, and the effects of beam-column section height ratio, axial compression ratio, beam-column steel content ratio and beam-column reinforcement ratio combination coefficient are introduced. The fitting formula of the combination coefficient is obtained through the nonlinear regression analysis of multivariable parameters, and the empirical value of the combination coefficient is given to determine the damage degree of SRC beam-column joints. Compared with the initial Park-Ang concrete member damage model, the modified model has less discreteness and higher accuracy, and is more suitable for SRC beam-column joint members. Meanwhile, to meet the seismic performance level of the three-level structure performance for “unbreakable under small earthquake, repairable under moderate earthquake and non-collapsing under large earthquake”, its performance is divided into three states: normal operation, life safety and near collapse according to the eigenvalues of its SRC beam-column joints, and the damage critical values are defined as 0.1, 0.55 and 0.95 respectively.

关 键 词：型钢混凝土 梁柱节点 损伤模型 损伤指数 组合系数 性能水准 

分 类 号：TU31[建筑科学—结构工程]