钢筋混凝土薄壁空心高墩塑性铰长度计算方法

Study on the calculation method of plastic hinge length of reinforced concrete high piers with thin-walled hollow sections

针对我国现行抗震设计规范尚未明确给出钢筋混凝土(RC)薄壁空心高墩塑性铰长度计算方法的问题,首先收集整理了既有RC桥墩塑性铰长度计算方法以及试验数据,分析影响塑性铰计算长度的主要因素;同时对实际桥梁工程采用的RC薄壁空心墩构造参数进行统计归纳.在验证有限元建模方法准确性后,采用ABAQUS软件建立了高度为40~120 m的8种典型RC薄壁空心高墩的精细化有限元模型,并开展非线性推覆分析,得到不同高度桥墩的等效塑性铰长度.最后讨论不同塑性铰长度计算方法的适用性,发现Eurocode 8规范的计算公式精度最高,可用于计算RC薄壁空心高墩的塑性铰长度.

Aiming at the problem that the current seismic design code in China has not yet given an exact method for calculating the plastic hinge length of reinforced concrete(RC)high piers with thin-walled hollow sections(THSRC piers for short),the existing plastic-hinge length calculation methods for RC piers and test data were firstly collected,and the main factors that affect the calculated plastic-hinge length were analyzed.Meanwhile,the structural parameters of THSRC piers used in actual bridge projects were summarized statistically.After verifying the accuracy of the finite element modeling(FEM)method,ABAQUS software was used to establish a refined FEM of eight typical THSRC piers with a height of 40 to 120 m,and nonlinear pushover analysis was carried out to obtain the equivalent plastic hinge lengths of different high piers.Finally,the applicability of various plastic hinge length calculation methods was discussed,and it is found that the calculation formula of Eurocode 8 specification has the highest accuracy,which can be used to calculate the plastic hinge length of THSRC piers.