空间钢网架结构力学性能的试验研究
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摘要
当前有关空间钢网架结构安全性能的检测试验资料明显不足。文中以某实际空间钢网架结构为研究对象,对其进行了较系统的静动力试验和有限元分析。试验测试时将网架区划为9个带状单元,在每个单元的最大挠度位置进行了逐级加载的静力试验和0 kN、40kN两种配重条件下网架整体结构的振动测试,获得了表征网架变形性能的刚度值和网架前三阶竖向弯曲振动频率,依据试验结果对该网架的力学特点进行了分析。由于理论简化与实际工程的差别,导致有限元分析结果与实测结果误差较大,但有限元分析结果可用于试验模态的辅助判断。文中对网架试验的单元区划、数据采集方法和试验数据的处理过程均作了详细说明,可为网架结构检测试验法的深入研究提供参考。
So far,there are very little experimental data on the safety related structural performance of a spatial steel grid.A real spatial steel grid is studied systematically;static and dynamic experiment as well as finite element analysis have been carried out.The spatial steel grid is divided into 9 strip elements during the test,each of the element is loaded by 0 kN and 40kN at its mid-span.Static deflection and vertical vibration frequencies are measured case by case.The load deflection curves and the first three modes of the spatial steel grid are obtained.Because of the complexity of the real structure,the gap between the finite element analysis result and the experimental result is quite large,but the finite element result can help to determine the order of each mode.The element dividing method,data acquisition,data processing are illustrated in detail.
So far,there are very little experimental data on the safety related structural performance of a spatial steel grid.A real spatial steel grid is studied systematically;static and dynamic experiment as well as finite element analysis have been carried out.The spatial steel grid is divided into 9 strip elements during the test,each of the element is loaded by 0 kN and 40kN at its mid-span.Static deflection and vertical vibration frequencies are measured case by case.The load deflection curves and the first three modes of the spatial steel grid are obtained.Because of the complexity of the real structure,the gap between the finite element analysis result and the experimental result is quite large,but the finite element result can help to determine the order of each mode.The element dividing method,data acquisition,data processing are illustrated in detail.
引文
[1]建设部.建设部对钢结构网架坍塌事故发出通报[EB].http://www.cscsf.com/wwroot/show news.asp?newsid=64.Ministry of Housing and Urban-Rural Development of the People's Republic of China(MOHURD).Notification of the collapse of the spatial steeltruss[EB].http://www.cscsf.com/wwroot/show news.asp?newsid=64.
[2]新华网国际频道.http://news.xinhuanet.com/world/2006/02/24/content-4219693.htm.International Channel of Xinhua Net.http://news.xinhuanet.com/world/2006/02/24/content-4219693.htm.
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[4]杨彦芳,宋玉普,纪卫红.基于实测频响函数主成分的在役网架损伤识别方法[J].振动与冲击,2007,26(9):128-132.Yang Yanfang,Song Yupu,Ji Weihong.An identification method of existing truss structural damage based on principal component analysis measuredfrequency response functions[J].Journal of Vibration and Shock,2007,26(9):128-132.
[5]宋玉普,刘志鑫,纪卫红.基于模态应变能与神经网络的钢网架损伤检测方法[J].土木工程学报,2007,40(10):13-18.Song Yupu,Liu Zhixin,Ji Weihong Damage diagnosis of spatial trusses based on modal strain energy and neural network[J].China Civil Engineer-ing Journal,2007,40(10):13-18.
[6]纪卫红,宋玉普,梁冰,等.利用ANSYS进行网架结构损伤诊断的数值模拟研究[J].武汉理工大学学报(交通科学与工程版),2006,30(2):285-288.Ji Weihong,Song Yupu,Liang Bing,et al.Numerical simulation research of for damage diagnosis of truss structure by ANSYS[J].Journal of Wu-han University of Technology(Transportation Science&Engineering),2006,30(2):285-288.
[7]高维成,刘伟,钱成.基于剩余模态力和模态应变能理论的网架结构损伤识别[J].工程力学,2007,24(5):93-100.Gao Weicheng,Liu Wei,Qian Cheng.Damage detection of space truss using residual modal force and modal strain energy[J].Engineering Me-chanics,2007,24(5):93-100.
[8]刘伟,高维成.单层短程线网壳结构模型试验研究[J].实验力学,2006,21(4):519-526.Liu Wei,Gao Weicheng.A Study on model test of single-layer geodesic dome[J].Journal of Experimental Mechanics,2006,21(4):519-526.
[9]Guo X,B.F.Spencer,Lu S.Application of the clan member signal method in structural damage detection[J].Journal of Earthquake Engineeringand Engineering Vibration,2007,7(1):29-34.
[10]Guo X,B.F.Spencer,Lu S.Symmetrical signal method and its application in structural damage detection[C]//3rd ANCRiSST Workshop onAdvanced Smart Materials and Smart Structures Technology,Reno,USA,2006:29-30.
[11]王金国,郭迅.大跨空间钢网架结构静和动力学性能实验研究[J].世界地震工程,2008,24(4):59-63.Wang Jinguo,Guo Xun.Experimental study on the static and dynamic behavior of a long span space truss[J].World Earthquake Engineering,2008,24(4):59-63.
[2]新华网国际频道.http://news.xinhuanet.com/world/2006/02/24/content-4219693.htm.International Channel of Xinhua Net.http://news.xinhuanet.com/world/2006/02/24/content-4219693.htm.
[3]李家伟,陈积懋.无损检测手册[M].北京:机械工业出版社,2002.Li Jiawei,Chen Jimao.Non-destructive Testing Mannual[M].Beijing:China Machine Press,2002.
[4]杨彦芳,宋玉普,纪卫红.基于实测频响函数主成分的在役网架损伤识别方法[J].振动与冲击,2007,26(9):128-132.Yang Yanfang,Song Yupu,Ji Weihong.An identification method of existing truss structural damage based on principal component analysis measuredfrequency response functions[J].Journal of Vibration and Shock,2007,26(9):128-132.
[5]宋玉普,刘志鑫,纪卫红.基于模态应变能与神经网络的钢网架损伤检测方法[J].土木工程学报,2007,40(10):13-18.Song Yupu,Liu Zhixin,Ji Weihong Damage diagnosis of spatial trusses based on modal strain energy and neural network[J].China Civil Engineer-ing Journal,2007,40(10):13-18.
[6]纪卫红,宋玉普,梁冰,等.利用ANSYS进行网架结构损伤诊断的数值模拟研究[J].武汉理工大学学报(交通科学与工程版),2006,30(2):285-288.Ji Weihong,Song Yupu,Liang Bing,et al.Numerical simulation research of for damage diagnosis of truss structure by ANSYS[J].Journal of Wu-han University of Technology(Transportation Science&Engineering),2006,30(2):285-288.
[7]高维成,刘伟,钱成.基于剩余模态力和模态应变能理论的网架结构损伤识别[J].工程力学,2007,24(5):93-100.Gao Weicheng,Liu Wei,Qian Cheng.Damage detection of space truss using residual modal force and modal strain energy[J].Engineering Me-chanics,2007,24(5):93-100.
[8]刘伟,高维成.单层短程线网壳结构模型试验研究[J].实验力学,2006,21(4):519-526.Liu Wei,Gao Weicheng.A Study on model test of single-layer geodesic dome[J].Journal of Experimental Mechanics,2006,21(4):519-526.
[9]Guo X,B.F.Spencer,Lu S.Application of the clan member signal method in structural damage detection[J].Journal of Earthquake Engineeringand Engineering Vibration,2007,7(1):29-34.
[10]Guo X,B.F.Spencer,Lu S.Symmetrical signal method and its application in structural damage detection[C]//3rd ANCRiSST Workshop onAdvanced Smart Materials and Smart Structures Technology,Reno,USA,2006:29-30.
[11]王金国,郭迅.大跨空间钢网架结构静和动力学性能实验研究[J].世界地震工程,2008,24(4):59-63.Wang Jinguo,Guo Xun.Experimental study on the static and dynamic behavior of a long span space truss[J].World Earthquake Engineering,2008,24(4):59-63.
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