高烈度地震区客运专线长联不对称预应力混凝土连续梁桥设计
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摘要
津秦客运专线下坞蓟运河特大桥主桥(40+64+80+80+48)m预应力混凝土连续梁将大跨长联不对称结构应用于高速铁路无砟轨道桥梁。为了保证结构受力和变形,尽量减小悬臂施工支点不平衡弯矩和成桥运营受力合理,采取加厚边跨底板与腹板厚度、设置混凝土压重的方法;为了将地震力均匀地分配到各中墩,在高速铁路桥梁上应用阻尼器,使各中墩共同承受地震力。
Located in the high-speed railway with ballastless track,Xiawuji Canal Bridge in Tianjin-Qinhuangdao Passenger-dedicated Line is a unsymmetrical long-span long-unit continuous prestressed concrete girder bridge with the span arrangement(40+64+80+80+48) m.To control the stress and deformation,diminish the unbalanced bending-moment at the supporting point during cantilever construction and make the force of the finished bridge reasonable,several methods were adopted in the design,such as thickening the thicknesses of bottom slab and web slab of side span,installing some concrete pressure loadings.In addition,to distribute the seismic force into each middle bridge pier evenly,the dampers were installed on the high-speed bridge so as to make all the bridge piers endure the seismic force together.
Located in the high-speed railway with ballastless track,Xiawuji Canal Bridge in Tianjin-Qinhuangdao Passenger-dedicated Line is a unsymmetrical long-span long-unit continuous prestressed concrete girder bridge with the span arrangement(40+64+80+80+48) m.To control the stress and deformation,diminish the unbalanced bending-moment at the supporting point during cantilever construction and make the force of the finished bridge reasonable,several methods were adopted in the design,such as thickening the thicknesses of bottom slab and web slab of side span,installing some concrete pressure loadings.In addition,to distribute the seismic force into each middle bridge pier evenly,the dampers were installed on the high-speed bridge so as to make all the bridge piers endure the seismic force together.
引文
[1]中铁工程设计咨询集团有限公司.TB J462-2005铁路桥涵钢筋混凝土和预应力混凝土结构设计规范[S].北京:中国铁道出版社,2005.
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[2]铁道第三勘察设计院.TB J460-2005铁路桥涵设计基本规范[S].北京:中国铁道出版社,2005.
[3]裘伯永,盛兴旺,乔建东,文雨松.桥梁工程[M].北京:中国铁道出版社,2005.
[4]铁道第三勘察设计院集团有限公司,中铁第四勘察设计院集团有限公司,中国铁道科学研究院.TB10621—2009高速铁路设计规范[S].北京:中国铁道出版社.2010.
[5]中华人民共和国铁道部.GB50111—2006铁路工程抗震设计规范[S].北京:中国计划出版社,2009.
[6]刘效尧,朱新实.预应力技术及材料设备[M].北京:人民交通出版社,1998.
[7]朱尔玉,刘磊.现代桥梁预应力结构[M].北京:清华大学出版社,2008.
[8]孙大斌.铁路三跨不对称单线预应力混凝土曲线连续梁设计[J].铁道标准设计,2009(5):65-67.
[9]范立础.预应力混凝土连续梁桥[M].北京:人民交通出版社,2001.
[10]许岳,王亚君,王振江.预应力混凝土连续梁桥设计[M].北京:人民交通出版社,2000.
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