砖混房屋整体式外套框架加层结构动力特性有限元分析
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摘要
用短梁连接砖混结构与外套框架是实际工程中常采用的一种整体式加层方案,为从整体上把握其动力特性和受力特点,本文利用ANSYS建立有限元模型,分别进行了模态分析、反应谱分析和弹性时程分析。分析结果和概念设计均表明,单纯采用短梁连接的整体式方案,存在纵向抗侧刚度较弱、扭转振动、刚度突变等问题,综合考虑短梁连接锚固的可靠性以及其传递水平地震作用的可靠性,若不辅以其他有效措施,在地震设防区不宜采用。
Connecting existing masonry structure with frame by short beams is a commonly used story-adding plan in practice.To get a better understanding of its dynamic behavior of this structural system,a real project was modeled,and modal analysis,response spectrum analysis and elastic time-history analysis were conducted using the ANSYS program.The analysis results and conceptual design all indicated that there exist weak longitudinal stiffness,torsion vibration and abrupt stiffness change.Considering the reliability of short beam anchoring and seismic action transferring,if no other effective measures are taken,it is not appropriate to be used in seismic defense zones.
Connecting existing masonry structure with frame by short beams is a commonly used story-adding plan in practice.To get a better understanding of its dynamic behavior of this structural system,a real project was modeled,and modal analysis,response spectrum analysis and elastic time-history analysis were conducted using the ANSYS program.The analysis results and conceptual design all indicated that there exist weak longitudinal stiffness,torsion vibration and abrupt stiffness change.Considering the reliability of short beam anchoring and seismic action transferring,if no other effective measures are taken,it is not appropriate to be used in seismic defense zones.
引文
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[3]施士?.混凝土的抗剪强度、剪切模量和弹性模量[J].土木工程学报,1999,32(2):47-52.
[4]肖小松,吕西林.砌体弹性模量取值的评述[J].四川建筑科学研究,1996,(4):18-21.
[5]李田.结构时程动力分析中的阻尼取值研究[J].土木工程学报,1997,30(3):68-73.
[6]杨傅,等.结构时程分析法输入地震波的选择控制指标[J].土木工程学报,2000,33(6):33-37.
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[9]翟长海.最不利设计地震动的研究[D].哈尔滨:中国地震局工程力学研究所,2002:97-102.
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