倒虹吸混凝土管道的地震反应分析
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摘要
基于土体的等效粘弹性模型,结合场地典型剖面的土体特性以及室内实验确定的各力学参数,采用时域积分和迭代的方法研究了沁河倒虹吸管道在地震作用下的反应,分析了管道截面中间底部点绝对地震位移、顶部点相对于底部点的地震动位移及管道动静综合主应力的变化规律;并根据有限元时程法的分析结果,按照混凝土承载能力极限状态设计式,对管身混凝土的抗拉、抗压安全度进行校核。结果表明,在人工地震波、调整后的E1 Centro和Pulgas地震波分别输入的情况下沁河渠道倒虹吸管道均满足抗震要求。
Adapting the equivalent viscoelastic model considering the characteristics of the soils at the site and some mechanics parameters such as maximum shear modulus,dynamic elastic modulus and damping ratio,determined by tests,the earthquake responses of Qinhe inverted siphon pipes are studied based on the method of integral in time domain and interation,and distribution regularity of the absolute displacement at the bottom center of the pipes,relative displacement of the top center to the bottom center of the pipes,and dynamic and static synthesis principal stresses are analyzed.According to the analysis results of finite elements method and the design equation of concrete limit bearing capacity,the security degree of resistance capacity of tensile and compress for the concrete pipes are checked.The results indicate that Qinhe inverted siphon pipes satisfy with earthquake-resistance requirements effected when man-made,the adjusted E1 Centro and Pulgas seismic waves inputted individually.
Adapting the equivalent viscoelastic model considering the characteristics of the soils at the site and some mechanics parameters such as maximum shear modulus,dynamic elastic modulus and damping ratio,determined by tests,the earthquake responses of Qinhe inverted siphon pipes are studied based on the method of integral in time domain and interation,and distribution regularity of the absolute displacement at the bottom center of the pipes,relative displacement of the top center to the bottom center of the pipes,and dynamic and static synthesis principal stresses are analyzed.According to the analysis results of finite elements method and the design equation of concrete limit bearing capacity,the security degree of resistance capacity of tensile and compress for the concrete pipes are checked.The results indicate that Qinhe inverted siphon pipes satisfy with earthquake-resistance requirements effected when man-made,the adjusted E1 Centro and Pulgas seismic waves inputted individually.
引文
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[2]赵海燕,周鸿钧,邓莉辉.三维节理元在倒虹吸结构中的应用[J].上海交通大学学报,1999,33(6):731-733.
[3]赵海燕,邓莉辉.南水北调工程倒虹吸结构三维节理元计算模型的建立[J].上海交通大学学报,2000,34(4):517-519.
[4]赵顺波,李晓克,胡志远,等.大型倒虹吸预应力混凝土结构模型试验研究[J].水力发电学报,2006,25(1):40-44.
[5]李晓克,赵顺波,刘树玉,等.大型倒虹吸结构预应力钢筋张拉施工顺序研究[J].利水电技术,2005,36(6):68-71.
[6]郑颖人,沈珠江,龚晓南.岩土塑性力学原理[M].北京:中国建筑工业出版社,2002.
[7]尚守平,刘方成,王海东.基于阻尼的地震循环荷载作用下黏土非线性模型[J].土木工程学报,2007,40(3):74-82.
[8]中华人民共和国水利部.水工建筑物抗震设计规范(SL203-97)[s].北京:中国水利电力出版社,1997.
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