基于摩擦耗能部分自复位连接组合框架子结构的层间受力机理分析
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摘要
为研究新型卷边PEC柱钢梁摩擦型耗能部分自复位连接组合框架层间受力机理,首先对采用有限元建模进行试验对比验证其合理性,再用后续试验试件为基础试件,考虑摩擦T形连接件螺栓布置方式、预拉杆预紧力及摩擦T形连接件长圆孔尺寸等设计参数,利用ABAQUS有限元软件建立6个试件模型并对其进行低周水平循环荷载作用下的数值模拟。根据模拟结果得到应力云图及相关滞回曲线,并分析各个参数对试件的自复位功效、耗能能力、残余转角及框架受力模式的影响。研究结果显示:摩擦T形连接件翼缘与PEC柱单边螺栓连接试件的面外翘曲变形较大,延缓了摩擦滑移耗能的发挥;增大预拉杆预紧力能够提高试件自复位功效和耗能能力;摩擦T形连接件长圆孔尺寸影响试件耗能能力的发挥及试件连接转化为承压型受力模式的进程;所有试件层间模拟加载至侧移角0.035 rad,即超过大震层间侧移角限值1/30时,层间残余侧移角和连接残余转角均未超过0.005 rad,表明试件具有良好的自复位功效。
To study the interstory anti-collapse behavior of the innovative crimping PEC column and steel beam with friction energy dissipation and partial self-centering structure, the rationality of building models by the finite element model was evaluated by the test. Then the subsequent test specimens were used as basic specimens,some design parameters as pre-force of pre-tensioned bar, the location of bolts in T-stub and the length of hole with T-stub were taken into consideration, six specimens were built by using ABAQUS under low-cyclic loading and were numerically simulated. based on the numerical simulation, the stress diagram and hysteretic curve were derived and the effects of various design parameters on the self-centering function, energy-dissipation capacity and force-transferring mechanism of self-centering connection were analyzed. Results show that specimen whose T-stub was connected with PEC column on one side had larger outside deformation, which delayed the progress of friction energy dissipation; different forces of pre-tensioned bar affected the performance of energy dissipation and self-centering function; the length of hole in T-stub mainly affected the carrying capacity and self-centering function. When the angle of displacement reached 0.035 rad which exceeded the story displacement limit of large earthquake 1/30, all residual drift angle and connection rotation were less than 0.005 rad, showing that the specimens have superior self-centering function.
To study the interstory anti-collapse behavior of the innovative crimping PEC column and steel beam with friction energy dissipation and partial self-centering structure, the rationality of building models by the finite element model was evaluated by the test. Then the subsequent test specimens were used as basic specimens,some design parameters as pre-force of pre-tensioned bar, the location of bolts in T-stub and the length of hole with T-stub were taken into consideration, six specimens were built by using ABAQUS under low-cyclic loading and were numerically simulated. based on the numerical simulation, the stress diagram and hysteretic curve were derived and the effects of various design parameters on the self-centering function, energy-dissipation capacity and force-transferring mechanism of self-centering connection were analyzed. Results show that specimen whose T-stub was connected with PEC column on one side had larger outside deformation, which delayed the progress of friction energy dissipation; different forces of pre-tensioned bar affected the performance of energy dissipation and self-centering function; the length of hole in T-stub mainly affected the carrying capacity and self-centering function. When the angle of displacement reached 0.035 rad which exceeded the story displacement limit of large earthquake 1/30, all residual drift angle and connection rotation were less than 0.005 rad, showing that the specimens have superior self-centering function.
引文
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[7]方有珍,陆承铎,马吉,等.新型卷边钢板组合截面PEC柱(弱轴)滞回性能足尺试验研究[J].土木工程学报,2013,46(1):24-33.
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[9]马吉,方有珍,陆承铎,等.薄钢板PEC柱-钢梁端板对拉螺栓连接滞回性能性能试验研究[J].工程力学,2013,30(6):107-115.
[10]赵凯,方有珍,陈赟,等.新型卷边PEC柱-钢梁摩擦耗能型部分自复位连接中节点抗震性能研究[J].工程抗震与加固改造,2016,38(3):97-105.
[11]方有珍,赵凯,陈赟,等.新型PEC柱-钢梁中节点摩擦耗能型部分自复位连接抗震性能试验研究[J].土木工程学报,2016,49(4):22-30.
[12]周文峰,黄宗明,白绍良,等.约束混凝土几种有代表性应力-应变模型及其比较[J].重庆建筑大学学报,2003,25(4):121-127.
[13]方有珍,马雪玉,耿苏齐,等.摩擦耗能部分自复位连接组合框架边节点抗震性能试验研究[J].工程科学与技术,2017,49(3):76-84.
[2]D WANG.Numerical and experimental studies of self-centering post-tensioned steel frames[D].The State University of New York,USA,2007.
[3]HOSEOK CHI.Development of post-tensioned column base connection for self-centering seismic resistant steel frame[D].Purdue University,US-A,2009.
[4]HOSEOK CHI,JUDY LIU,MARIA GARLOCK.Design and analytical validation of post-tensioned column bases[C]//Proceedings of the 2008Structures Congress,Vancouver(B C,Canada),2008.
[5]吕西林,崔晔,刘兢兢,等.自复位钢筋混凝土框架结构振动台试验研究[J].建筑结构学报,2014,35(1):19-26.
[6]张艳霞,叶吉健,杨凡,等.自复位钢框架结构抗震性能动力时程分析[J].土木工程学报,2015,48(7):30-40.
[7]方有珍,陆承铎,马吉,等.新型卷边钢板组合截面PEC柱(弱轴)滞回性能足尺试验研究[J].土木工程学报,2013,46(1):24-33.
[8]方有珍,马吉,陆承铎,等.新型卷边钢板组合截面PEC柱(强轴)滞回性能试验研究[J].工程力学,2013,30(3):181-190.
[9]马吉,方有珍,陆承铎,等.薄钢板PEC柱-钢梁端板对拉螺栓连接滞回性能性能试验研究[J].工程力学,2013,30(6):107-115.
[10]赵凯,方有珍,陈赟,等.新型卷边PEC柱-钢梁摩擦耗能型部分自复位连接中节点抗震性能研究[J].工程抗震与加固改造,2016,38(3):97-105.
[11]方有珍,赵凯,陈赟,等.新型PEC柱-钢梁中节点摩擦耗能型部分自复位连接抗震性能试验研究[J].土木工程学报,2016,49(4):22-30.
[12]周文峰,黄宗明,白绍良,等.约束混凝土几种有代表性应力-应变模型及其比较[J].重庆建筑大学学报,2003,25(4):121-127.
[13]方有珍,马雪玉,耿苏齐,等.摩擦耗能部分自复位连接组合框架边节点抗震性能试验研究[J].工程科学与技术,2017,49(3):76-84.
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