宝鑫, 刘晶波, 李述涛, 陆喜欢, 王菲. 地下结构整体式反应位移法的改进[J]. 工程力学, 2023, 40(1): 76-86. DOI: 10.6052/j.issn.1000-4750.2021.08.0592
引用本文: 宝鑫, 刘晶波, 李述涛, 陆喜欢, 王菲. 地下结构整体式反应位移法的改进[J]. 工程力学, 2023, 40(1): 76-86. DOI: 10.6052/j.issn.1000-4750.2021.08.0592
BAO Xin, LIU Jing-bo, LI Shu-tao, LU Xi-huan, WANG Fei. IMPROVEMENT OF INTEGRAL RESPONSE DEFORMATION METHOD FOR UNDERGROUND STRUCTURES[J]. Engineering Mechanics, 2023, 40(1): 76-86. DOI: 10.6052/j.issn.1000-4750.2021.08.0592
Citation: BAO Xin, LIU Jing-bo, LI Shu-tao, LU Xi-huan, WANG Fei. IMPROVEMENT OF INTEGRAL RESPONSE DEFORMATION METHOD FOR UNDERGROUND STRUCTURES[J]. Engineering Mechanics, 2023, 40(1): 76-86. DOI: 10.6052/j.issn.1000-4750.2021.08.0592

地下结构整体式反应位移法的改进

IMPROVEMENT OF INTEGRAL RESPONSE DEFORMATION METHOD FOR UNDERGROUND STRUCTURES

  • 摘要: 整体式反应位移法是目前常用的地下结构抗震实用分析方法,但在求解等效输入地震荷载的过程中,需对自由场土层模型中土-结构交界面所包围的所有土体单元施加自由场惯性力,处理过程相对复杂。该文基于有限元离散模型,从理论上证明了整体式反应位移法中由结构周边应力引起的等效地震荷载可通过仅由一层土体单元构成的子结构模型的一次静力分析获得,由此提出了一种基于土体内部子结构的地下结构整体式反应位移法,即改进方法一;进一步论证了改进方法一中内部土体子结构的惯性力对等效地震荷载的影响可以忽略,在此基础上提出地下结构整体式反应位移法的改进方法二,该方法避免了土层介质自由场惯性力的计算与施加,从而有效简化了整体式反应位移法的实施流程。通过与传统整体式反应位移法的对比分析,验证了该文改进方法具有良好的计算精度,可用于地铁车站、地下隧道等地下结构的地震反应分析与抗震性能研究。

     

    Abstract: The integral response deformation method is a commonly used seismic response analysis method for underground structures. However, in the process of solving the equivalent input seismic loads, it is necessary to apply the free-wave-field inertial force to all soil elements surrounded by the soil-structure interface in a free field model. The implementation processes are relatively complicated. Based on the discrete finite element model, the equivalent seismic loads caused by the surrounding stress of underground structures can be obtained through a static analysis of a substructure model consisting of only one layer of soil elements. On that basis, a modified integral response deformation method based on the substructure of soil layer is proposed, namely the first improved method. Furthermore, it is revealed that the influence of the inertial force of the soil layer on the equivalent seismic loads can be ignored. Then the second improved method of the integral response deformation method for underground structures is proposed. This method avoids the calculation and application of the free-wave-field inertial force of soil layers, thus effectively simplifying the implementation process of the integral response deformation method. The comparative analysis with the traditional integral response deformation method verifies that the proposed methods have good calculation accuracy, thus can be applied to the seismic response analysis and seismic performance research of underground structures such as subway stations and underground tunnels.

     

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