高强钢筋高强混凝土桥墩等效塑性铰区长度分析

Analysis of equivalent plastic hinge length of high strength concrete bridge columns reinforced with high strength rebars

钢筋与混凝土材料的高强化是工程结构发展的重要方向,为研究配置高强钢筋的高强混凝土桥墩等效塑性铰区长度,整理了37根高强钢筋高强混凝土桥墩试验数据,与Priestley、Paulay、Telemachos及我国《公路桥梁抗震设计细则》建议的塑性铰区长度计算公式进行了对比分析,并通过灰色关联方法分析了影响高强钢筋高强混凝土桥墩等效塑性铰区长度的主要因素。研究表明:与试验结果相比,各公式计算值离散性较大,Paulay公式、Telemachos公式偏于不安全,Priestley公式和我国JTG/TB 02—01—2008《公路桥梁抗震设计细则》建议公式偏于保守;在高强钢筋高强混凝土桥墩等效塑性铰长度的各影响因素中,纵筋直径影响最大,其次是试件高度和截面宽度,试件轴压比和力学含箍率影响最小,高强钢筋高强混凝土桥墩等效塑性铰区长度的主要影响因素基本符合目前的认识水平。

High strength material of reinforcement and concrete is the important orientation of engineering construction development.In order to study the equivalent plastic hinge length of high-strength reinforced concrete bridge columns, 37 test results were collected, and eontrastive analysis on the formulae which proposed by priestley,paulay, telemachos and JTG/TB 02-01-2008 were done.Influence factors which affect the equivalent plastic hinge length of high strength concrete bridge columns reinforced with high strength rebar through grey-correlation analysis method were analyzed.It is found that, compare to test results, all the proposed formulae show considerable scatter in estimating the plastic hinge of the columns.The expressions proposed by Panlay, Telemachos are not safe.While Priestley proposed formula and JTG/TB 02-01-2008 give conservative result.Among the influence factors, the diameter of longitudinal steel is the most important, secondly is the specimen length and section width.And axial load ratio and mechanical transverse steel ratio of the specimens show small influence.Main influence factors of the equivalent plastic hinge length of high-strength reinforced concrete bridge colunms mostly accord with actual level.