动力基础弹性半空间理论实用化分析
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摘要
动力基础弹性半空间理论将地基假设为匀质弹性体,力学分析、数学运算均非常严密。然而地基土体远非匀质,理论与实际情况差别较大,须经测试对比予以修正;为了便于实用计算,在理论计算上作简化,将半空间等效于单、双自由度的集总体系,但与实际情况亦有所差别,故可将动力基础弹性半空间理论的计算视作半理论半经验。将半空间等效之后,最大优点是考虑了振波能量在传播中消耗及产生的辐射阻尼,大大提高了地基阻尼比,经济效益显著。
The elastic half-space theory of dynamic foundation assumes that the foundation is a homogeneous elastic body, and the mechanical analysis and mathematical calculation are very strict. However, the foundation soil is far from homogeneous, and the difference between theory and practice is great, so it needs to be revised by test and comparison. In order to facilitate practical calculation, the theoretical calculation was simplified, and the half-space was equivalent to the set system of single and double degrees of freedom, but it was also different from the actual situation. Therefore, the calculation of elastic half-space theory of dynamic foundation could be regarded as semi-theoretical and semi-empirical. After half-space was equivalent, the greatest advantage is that the energy consumption of vibration wave and the radiation damping produced in the propagation were considered, which greatly improved the foundation damping ratio and had remarkable economic benefits.
The elastic half-space theory of dynamic foundation assumes that the foundation is a homogeneous elastic body, and the mechanical analysis and mathematical calculation are very strict. However, the foundation soil is far from homogeneous, and the difference between theory and practice is great, so it needs to be revised by test and comparison. In order to facilitate practical calculation, the theoretical calculation was simplified, and the half-space was equivalent to the set system of single and double degrees of freedom, but it was also different from the actual situation. Therefore, the calculation of elastic half-space theory of dynamic foundation could be regarded as semi-theoretical and semi-empirical. After half-space was equivalent, the greatest advantage is that the energy consumption of vibration wave and the radiation damping produced in the propagation were considered, which greatly improved the foundation damping ratio and had remarkable economic benefits.
引文
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[3] 吴邦达,吴丽波.地基半空间等效集总体系的比拟法与实测分析[J].地震工程学报,2015,37(4):1029-1036
[4] 苏联动力机器基础设计规范:СНиП ⅱⅡ-19-79[S].北京:化学工业部建筑设计技术中心站译,1980.
[5] 杨先健,徐建,张翠红.土-基础的振动与隔振[M].北京:中国建筑工业出版社,2013.
[6] 杨先健,徐永利,张青山,等.125 000kN压力机基础设计.建筑结构优秀设计图集4[M].北京:中国建筑工业出版社,2005.
[7] 动力机器基础设计规范:GB 50040—96[S].北京:中国计划出版社,1996.
[8] 液压振动台基础技术规范:GB 50699—2011 [S].北京:中国计划出版社,2011.
[9] 第一机械工业部设计研究总院.动力机器基础设计手册[M].北京:中国建筑工业出版社,1986.
[2] E REISSNER.Stationēare,axial symmetrische,durch eine schüttelnde masse erregte schwingungen eines homogenen elastischen halbraumes[J].Ingenieur-Archiv,1936,7(6):381-396.
[3] 吴邦达,吴丽波.地基半空间等效集总体系的比拟法与实测分析[J].地震工程学报,2015,37(4):1029-1036
[4] 苏联动力机器基础设计规范:СНиП ⅱⅡ-19-79[S].北京:化学工业部建筑设计技术中心站译,1980.
[5] 杨先健,徐建,张翠红.土-基础的振动与隔振[M].北京:中国建筑工业出版社,2013.
[6] 杨先健,徐永利,张青山,等.125 000kN压力机基础设计.建筑结构优秀设计图集4[M].北京:中国建筑工业出版社,2005.
[7] 动力机器基础设计规范:GB 50040—96[S].北京:中国计划出版社,1996.
[8] 液压振动台基础技术规范:GB 50699—2011 [S].北京:中国计划出版社,2011.
[9] 第一机械工业部设计研究总院.动力机器基础设计手册[M].北京:中国建筑工业出版社,1986.