地震特性对新型分离卸荷式板桩码头动力响应的影响
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摘要
采用有限元对地震荷载作用下的新型分离卸荷式板桩码头动力响应开展研究,分析不同强度、不同类型的地震作用对分离卸荷式板桩码头结构内力的影响。计算结果表明:在不同特性地震荷载作用下,前墙-拉杆-锚碇墙和前桩-后桩-卸荷平台均能分别形成相对独立结构体系,保持整体受荷承载。结构最大值内力出现的时刻与地震加速度时程峰值的时刻是不对应的。随着地震峰值加速度的增大,各码头结构的最大内力值都有不同比例的增大,其中前墙弯矩增幅最大,锚碇墙弯矩和拉杆拉力的增幅次之,前桩和后桩的弯矩增幅最小;当地震峰值加速度相等时,Kobe波作用下的各结构最大内力放大系数总是大于El-Centro波作用时的值,结构的动力响应不仅仅与地震时程峰值大小有关,还需充分考虑频谱特性及波能密度等地震荷载特性的影响。
Numerical analysis on dynamic responses of the new kind of sheet-pile wharf with separated relieving platform has been made with FEM method, the influences on seismic wave characteristics on dynamic behavior of the new wharf structure have been analyzed in details. The results showed that with the effect of different seismic loads, front wall-tie rob-anchor wall and front pile-back pile-platform worked as independent structure systems respectively, and they carried the additional loads together. When the peak acceleration of earthquake wave appeared, the corresponding internal forces of each structure component were not the maximum values. With the increase of peak ground acceleration, the internal forces were all increased in different agree, the amplification of front wall bending moment was the largest, those of anchor wall bending moment and tie rob tension force were a bit smaller, and those of front pile and back pile bending moments were the smallest. The amplification of each structure component internal force under the Kobe wave was always larger than that under the El-Centro wave, which indicated that the dynamic responses were also related to other seismic load characteristics, such as wave energy density and spectrum, except for wave peak value.
Numerical analysis on dynamic responses of the new kind of sheet-pile wharf with separated relieving platform has been made with FEM method, the influences on seismic wave characteristics on dynamic behavior of the new wharf structure have been analyzed in details. The results showed that with the effect of different seismic loads, front wall-tie rob-anchor wall and front pile-back pile-platform worked as independent structure systems respectively, and they carried the additional loads together. When the peak acceleration of earthquake wave appeared, the corresponding internal forces of each structure component were not the maximum values. With the increase of peak ground acceleration, the internal forces were all increased in different agree, the amplification of front wall bending moment was the largest, those of anchor wall bending moment and tie rob tension force were a bit smaller, and those of front pile and back pile bending moments were the smallest. The amplification of each structure component internal force under the Kobe wave was always larger than that under the El-Centro wave, which indicated that the dynamic responses were also related to other seismic load characteristics, such as wave energy density and spectrum, except for wave peak value.
引文
[1]刘永绣.板桩和地下墙码头的设计理论和方法[M].北京:人民交通出版社,2006(Liu Yongxiu.Designing theory and method for sheet pile wharfs and diaphragm wall wharfs[M].Beijing:China Communication Press,2006(in Chinese))
[2]于泳,焦志斌,葛兵.分离卸荷式地下连续墙板桩码头运行初期前墙工作性状的观测与研究[J].港工技术,2011,48(5):26-28(Yu Yong,Jiao Zhibin,Ge Bing.Study and observation of front wall’s working state of separated relief diaphragm retaining wall sheet-pile wharf at initial operating stage[J].Port Engineering Technology,2011,48(5):26-28(in Chinese))
[3]龚丽飞.分离卸荷式地下连续墙板桩码头结构与土相互作用研究[D].南京:南京水利科学研究院,2007(Gong Lifei.Study on soil-structure interaction of the diaphragm sheet-pile wharf with separated relieving platform[D].Nanjing:Nanjing Hydraulic Research Institute,2007(in Chinese))
[4]李利军,杨海霞,范明桥,等.分离卸荷式板桩码头中地下连续墙的性状[J].河海大学学报:自然科学版,2012,40(4):475-478(Li Lijun,Yang Haixia,Fan Mingqiao,et al.Behaviors of underground diaphragm wall of sheet pile wharf with separated relieving platform[J].Journal of Hohai University:Natural Sciences Edition,2012,40(4):475-478(in Chinese))
[5]Motoki K,Toshihiro N.Damage statistics(summary of the2011 off the Pacific Coast of Tohoku Earthquake damage)[J].Soils and Foundations,2012,52(5):780-792
[6]Susumu I,Tomohiro K.Finite element analysis of earthquake induced damage to anchored sheet pile quay walls[J].Soils and Foundations,1993,33(1):71-91
[7]Nozu A,Ichii K,Sugano T.Seismic design of port structures[J].Journal of Japan Association for Earthquake Engineering,2004,4(3):195-208
[8]Lysmer J,Kuhlmeyer R L.Finite dynamic model for infinite media[J].Journal of Engineering and Mechanical Division,1969,95(4):859-877
[9]樊剑,吕超,张辉.地震波时频特征及与结构地震响应的关系[J].工程力学,2010,27(6):98-105(Fan Jian,Lu Chao,Zhang Hui.Relation between time-frequency characteristic of earthquake ground motions and structural earthquake responses[J].Engineering Mechanics,2010,27(6):98-105(in Chinese))
[2]于泳,焦志斌,葛兵.分离卸荷式地下连续墙板桩码头运行初期前墙工作性状的观测与研究[J].港工技术,2011,48(5):26-28(Yu Yong,Jiao Zhibin,Ge Bing.Study and observation of front wall’s working state of separated relief diaphragm retaining wall sheet-pile wharf at initial operating stage[J].Port Engineering Technology,2011,48(5):26-28(in Chinese))
[3]龚丽飞.分离卸荷式地下连续墙板桩码头结构与土相互作用研究[D].南京:南京水利科学研究院,2007(Gong Lifei.Study on soil-structure interaction of the diaphragm sheet-pile wharf with separated relieving platform[D].Nanjing:Nanjing Hydraulic Research Institute,2007(in Chinese))
[4]李利军,杨海霞,范明桥,等.分离卸荷式板桩码头中地下连续墙的性状[J].河海大学学报:自然科学版,2012,40(4):475-478(Li Lijun,Yang Haixia,Fan Mingqiao,et al.Behaviors of underground diaphragm wall of sheet pile wharf with separated relieving platform[J].Journal of Hohai University:Natural Sciences Edition,2012,40(4):475-478(in Chinese))
[5]Motoki K,Toshihiro N.Damage statistics(summary of the2011 off the Pacific Coast of Tohoku Earthquake damage)[J].Soils and Foundations,2012,52(5):780-792
[6]Susumu I,Tomohiro K.Finite element analysis of earthquake induced damage to anchored sheet pile quay walls[J].Soils and Foundations,1993,33(1):71-91
[7]Nozu A,Ichii K,Sugano T.Seismic design of port structures[J].Journal of Japan Association for Earthquake Engineering,2004,4(3):195-208
[8]Lysmer J,Kuhlmeyer R L.Finite dynamic model for infinite media[J].Journal of Engineering and Mechanical Division,1969,95(4):859-877
[9]樊剑,吕超,张辉.地震波时频特征及与结构地震响应的关系[J].工程力学,2010,27(6):98-105(Fan Jian,Lu Chao,Zhang Hui.Relation between time-frequency characteristic of earthquake ground motions and structural earthquake responses[J].Engineering Mechanics,2010,27(6):98-105(in Chinese))
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