变截面门式刚架的动力特性
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摘要
考虑材料非线性,采用ANSYS程序建立变截面门式刚架动力特性的数值模拟分析模型.通过对不同跨度和柱长细比的变截面门式刚架的动力特性分析表明,变截面门式刚架结构的滞回曲线比较饱满,呈梭形,具有良好的塑性变形能力和滞回耗能能力.变截面门式刚架在低周反复循环荷载作用下发生了刚度与强度的退化,且程度不断加大.门式刚架结构的延性随着跨度或柱长细比的增大而降低;当跨度大于42 m和柱长细比大于90后,门式刚架的刚度和强度退化速率加快,结构的延性迅速降低.变截面门式刚架的正负向荷载及相应的位移并不完全对称,表现出鲍辛格效应.
A dynamic numerical simulation model of a tapered portal frames considering the nonlinearity of the materials,established by ANSYS program.Dynamic modes analysis of tapered portal frames with different spans and slenderness ratio shows: the tapered portal steel frames own shuttle-shaped plump hysteretic curves with good energy dissipation and good plastic deformation.The rigidity and strength of the tapered portal steel frame degrade increasingly under the low cyclic loading.The ductility of the tapered portal steel frames reduces evidently with increasing spans or column slenderness ratios;when the span is larger than 42 m and the slenderness ratio is greater than 90,the degradation of the stiffness and strength of the portal frame accelerates,and ductility of the structure decreases rapidly.Under the forward and reverse loading on the frames,the corresponding displacements are not entirely symmetrical,appearing the Bauschinger's effects.
A dynamic numerical simulation model of a tapered portal frames considering the nonlinearity of the materials,established by ANSYS program.Dynamic modes analysis of tapered portal frames with different spans and slenderness ratio shows: the tapered portal steel frames own shuttle-shaped plump hysteretic curves with good energy dissipation and good plastic deformation.The rigidity and strength of the tapered portal steel frame degrade increasingly under the low cyclic loading.The ductility of the tapered portal steel frames reduces evidently with increasing spans or column slenderness ratios;when the span is larger than 42 m and the slenderness ratio is greater than 90,the degradation of the stiffness and strength of the portal frame accelerates,and ductility of the structure decreases rapidly.Under the forward and reverse loading on the frames,the corresponding displacements are not entirely symmetrical,appearing the Bauschinger's effects.
引文
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[2]王文明.变截面轻型门式刚架结构体系的稳定研究[D].北京:清华大学,1998.
[3]KARAMANOS S,SPYROS A K.Earthquake effects on low-rise steel buildings in high seismicity areas:A desig-ner′s view[J].J Construct Steel Res,1997,44(1-2):115-128.
[4]章军,王元清,陈宏,等.地震作用下门式刚架轻型房屋钢结构的设计与分析[J].四川建筑科学研究,2004,30(2):74-77.
[5]干洪,魏东.变截面框架结构动力分析与抗震计算[J].安徽建筑工业学院学报:自然科学版,2003,11(3):1-5.
[6]徐贵章.变截面刚架结构抗震设计的分析与计算[J].工程抗震,1997,6(2):6-10.
[7]KWON H D,PARK Y P.Dynamic characteristics of stepped cantilever beams connected with a rigid body[J].Journal of Sound and Vibration,2002,255(4):701-717.
[8]HWANG J S,CHANG K C,LEE G C,et al.Shaking table tests of pinned-base steel gable frame[J].Journal ofStructural Engineering,1989,115(12):3031-3043.
[9]HWANG J S,CHANG K C,LEE G C.Seismic behavior of gable frame consisting of tapered members[J].Journalof Structural Engineering,1991,117(3):808-821.
[10]中国工程建设标准化协会.CECS102:2002门式刚架轻型房屋钢结构技术规程[S].北京:中国计划出版社,2003.
[11]陈城.变截面宽肢薄腹构件滞回性能的试验研究和数值模拟[D].上海:同济大学,2002.
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