单指标分析在抗震支座参数优化中的应用
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摘要
建立了大跨度斜拉桥和抗震支座的空间有限元模型,采用时程分析方法计算了铅芯橡胶支座不同参数条件下斜拉桥的地震响应.提出把单指标分析和正交设计方法用于大跨度斜拉桥的抗震支座参数优化.研究表明把单指标分析用于铅芯橡胶支座的参数优化,能够以较小的计算量获得各因素的主次关系及较优水平组合;在斜拉桥铅芯橡胶支座的3个参数中,铅芯直径是主要的控制性因素,橡胶直径是次要因素,而橡胶剪切模量则是影响最小的因素;铅芯能耗散地震产生的能量,减小主梁纵向位移和塔顶位移的同时,又能有效减小塔根弯矩,相比普通弹性连接装置能更加有效的减小斜拉桥地震响应.
The 3rd finite element models of a long-span cable-stayed bridge and seismic bearings is established and the seismic response with different LRB's parameter is calculated by time history analysis method.The orthogonal design and single index analysis is applied to the parameters optimization of aseismic bearing in the long-span cable-stayed bridge.Research shows:the primary and secondary relations of various factors and the optimal level combination can be acquired at a smaller amount of calculation by single index analysis in the Parameters Optimization of LRB;in the three parameters of LRB,the leading core diameter is the main controlling factor,second is the rubber diameter,the shear modulus of rubber is minimal;The Lead can reduce the longitudinal displacement of the girder and the tower top can effectively reduce the tower root bending moment with consuming a large number of seismic energy.Compared to common elastic connecting device,LRB can more effectively reduce the seismic response of the cable-stayed bridge.
The 3rd finite element models of a long-span cable-stayed bridge and seismic bearings is established and the seismic response with different LRB's parameter is calculated by time history analysis method.The orthogonal design and single index analysis is applied to the parameters optimization of aseismic bearing in the long-span cable-stayed bridge.Research shows:the primary and secondary relations of various factors and the optimal level combination can be acquired at a smaller amount of calculation by single index analysis in the Parameters Optimization of LRB;in the three parameters of LRB,the leading core diameter is the main controlling factor,second is the rubber diameter,the shear modulus of rubber is minimal;The Lead can reduce the longitudinal displacement of the girder and the tower top can effectively reduce the tower root bending moment with consuming a large number of seismic energy.Compared to common elastic connecting device,LRB can more effectively reduce the seismic response of the cable-stayed bridge.
引文
[1]叶爱君.胡世德,范立础.超大跨度斜拉桥的地震位移控制[J].土木工程学报,2004,37(12):38-43.
[2]李建中,袁万城.斜拉桥减震、耗能体系非线性纵向地震反应分析[J].中国公路学报。1998,11(1):71-76.
[3]吴彬,庄军生.铅芯橡胶支座力学性能及其在桥梁工程中减、隔震应用研究[J].中国铁道科学,2004,25(4):138-140.
[4]范立础,王志强.桥梁减隔震设计[M].北京:人民交通出版社,2001.
[5]金良超.正交设计与多指标分析[M].北京:中国铁道出版社.1988.
[6]范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京:人民交通出版社。2001.
[7]Fan L C,Hu S D,Ye A J.Seismic design of long span bridges[M].Beijing:China Communications Press,2001.
[2]李建中,袁万城.斜拉桥减震、耗能体系非线性纵向地震反应分析[J].中国公路学报。1998,11(1):71-76.
[3]吴彬,庄军生.铅芯橡胶支座力学性能及其在桥梁工程中减、隔震应用研究[J].中国铁道科学,2004,25(4):138-140.
[4]范立础,王志强.桥梁减隔震设计[M].北京:人民交通出版社,2001.
[5]金良超.正交设计与多指标分析[M].北京:中国铁道出版社.1988.
[6]范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京:人民交通出版社。2001.
[7]Fan L C,Hu S D,Ye A J.Seismic design of long span bridges[M].Beijing:China Communications Press,2001.
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