预应力型钢混凝土框架梁弯矩调幅试验研究
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摘要
为研究预应力型钢混凝土框架梁的内力重分布及弯矩调幅规律,完成了2榀预应力型钢混凝土框架的竖向静力实验.结果表明:预应力型钢混凝土框架梁能够实现内力重分布,梁端截面荷载曲率曲线近似为线性.采用有限元分析软件对试验框架进行了仿真模拟,并对试验框架梁型钢截面尺寸、相对受压区高度的参数进行分析.基于试验及有限元分析结果,提出了预应力型钢混凝土框架梁端塑性铰长度计算公式,并给出了以梁端控制截面在极限荷载下的弹性弯矩计算值与张拉引起的次弯矩之和为调幅对象、以相对受压区高度和塑性转角为自变量的调幅系数计算公式.
In order to investigate the law of internal force redistribution and moment modulation,two large scale prestressed steel reinforced concrete frames were tested.The results show: internal force redistribution is achieved and the curve of load curvature on frame beam end is approximately linear.Non-linear simulation and parameters analysis such as the change of steel size and relative compression depth on experiment frames was performed.Based on experiments and non-linear analysis,the calculation formula of the plastic hinge length and moment modification coefficient was presented,in which the object of moment modification was the summation of elastic calculated moment of critical section at frame beams end under ultimate load and the secondary moment due to prestress,and the variable was the relative compression depth and plastic rotation.
In order to investigate the law of internal force redistribution and moment modulation,two large scale prestressed steel reinforced concrete frames were tested.The results show: internal force redistribution is achieved and the curve of load curvature on frame beam end is approximately linear.Non-linear simulation and parameters analysis such as the change of steel size and relative compression depth on experiment frames was performed.Based on experiments and non-linear analysis,the calculation formula of the plastic hinge length and moment modification coefficient was presented,in which the object of moment modification was the summation of elastic calculated moment of critical section at frame beams end under ultimate load and the secondary moment due to prestress,and the variable was the relative compression depth and plastic rotation.
引文
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[2]熊学玉,高峰,李亚明.预应力型钢混凝土框架梁试验研究及抗裂度分析[J].工业建筑,2011,41(12):16-20.
[3]熊学玉,高峰,李亚明.预应力型钢混凝土框架梁裂缝控制试验分析及计算[J].工业建筑,2011,41(12):20-24.
[4]熊学玉,高峰,李亚明.预应力型钢混凝土框架梁正截面承载力试验及计算[J].工业建筑,2011,41(12):24-30.
[5]王钧,邬丹,郑文忠.预应力H型钢混凝土简支梁正截面受力性能试验[J].哈尔滨工业大学学报,2009,41(6):22-27.
[6]傅传国,李玉莹,梁书亭.预应力型钢混凝土简支梁受弯性能试验研究[J].建筑结构学报,2007(6),28(3):62-73.
[7]郑文忠,王钧,韩宝权,等.内置H型钢预应力混凝土连续组合梁受力性能试验研究[J].建筑结构学报,2010(7):23-31.
[8]王金昌,陈页开.ABAQUS在土木工程中的应用[M].杭州:浙江大学出版社,2007.
[9]王玉镯.ABAQUS结构工程分析及实例详解[M].北京:中国建筑工业出版社,2010.
[10]孙文君.基于ABAQUS的型钢混凝土梁三维非线性分析[J].福建建筑,2011,151(1):54-56.
[11]中国建筑科学研究院.GB50010—2010混凝土结构设计规范[S].北京:中国建筑工业出版社,2010.
[12]简斌,王正霖,白绍良.预应力混凝土连续梁弯矩调幅建议[J].重庆建筑大学学报,1999,21(2):12-18.
[13]简斌,孙新敏,王正霖.后张有粘结预应力棍凝土框架弯矩调幅的试验[J].重庆大学学报,2004,27(4):107-110.
[14]薛建阳,赵鸿铁.型钢混凝土框架模型的弹塑性地震反应分析[J].建筑结构学报,2000,21(4):28-33.
[15]何广汉,蒲黔辉,王海良,等.论部分预应力混凝土连续梁桥的塑性行为[J].铁道学报,1993,15(4):103-109.
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