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3D seismic response of a 2D hill-valley staggered topography modeled by a 2.5D multi-domain IBEM

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Earthquake Science 2019年第3期32卷 125-142页

作者： Zhenning Ba Qiaozhi Sang jianwen liang Department of Civil Engineering Tianjin UniversityTianjin 300072China Key Laboratory of Coast Civil Structure Safety(Tianjin University) Ministry of EducationTianjin 300072China

A two and a half dimensional(2.5D)multi-domain indirect boundary element method(IBEM)is developed to study the wave scattering of obliquely incident P-,SV-and SH-waves by a hill-valley staggered topography in a multi-layered *** IBEM algorithm includes using 2.5D full-space and half-space Green’s functions to construct scattered fields in decomposed closed and opened half-space regions,respectively,and using the dynamic stiffness method to solve the free *** regions are finally integrated by introducing the compatibility conditions to obtain the total wave *** proposed 2.5D IBEM has the flexibility in dealing with complex boundaries by directly applying the fictitious loads on the regions’boundaries,with a less storage requirement compared to the full 3D ***,by combining the specific advantages of the two kinds of Green’s functions,the method is well suitable for handling coupled topographies with high *** method is validated by comparison with published results for a single valley as well as a single hill *** effects of height-to-width ratio of hill and layering on dynamic responses are further parametrically investigated by numerical implementations in frequency *** show that the interaction between valley and hills can lead to a more significant amplification within the valley region,and dynamic responses are deeply influenced by the height-to-width of hill,simultaneously depending on incident angle and ***,the site effects become more complex when the stratification feature is taken into account.

关键词： 2.5D multi-domain IBEM Green’s functions for moving load hill-valley staggered topography wave scattering layered half-space

Diffraction of plane SH waves by a semi-circular cavity in half-space

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Earthquake Science 2010年第1期23卷 5-12页

作者： jianwen liang Hao Luo Vincent W Lee Department of Civil Engineering Tianjin University Tianjin 300072 China HNTB Corporation SantaAna CA 92707 USA University of Southern California Los Angeles CA 90089-2531 USA

This paper presents a closed-form solution for diffraction of plane SH waves by a semi-circular cavity in half-space by using wave function expansion method. Accuracy of the solution is checked by the displacement residual and stress residual along the boundaries. Numerical results show that there are notable differences for response amplitudes between a semi-circular cavity and a whole-circular cavity in a half-space.

关键词： diffraction SH wave semi-circular cavity wave function expansion method closed-form solution

3D Diffraction of obliquely incident SH waves by twin infinitely long cylindrical cavities in layered poroelastic half-space

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Earthquake Science 2013年第6期26卷 395-406页

作者： jianwen liang Bing Han Zhenning Ba Department of Civil Engineering Tianjin University Tianjin Key Laboratory of Civil Engineering Structures & New Materials

Abstract This paper studies three-dimensional diffraction of obliquely incident plane SH waves by twin infinitely long cylindrical cavities in layered poroelastic half-space using indirect boundary element method. The approach is validated by comparison with the literature, and the effects of cavity interval, incident frequency, and boundary drainage condition on the diffraction are studied through numerical examples. It is shown that, the interaction between two cavities is significant and surface displacement peaks become large when two cavities are close, and the surface displacement may be significantly amplified by twin cavities, and the influence range with large amplification can be as wide as 40 times of the cavity radius. Surface displacements in dry poroelastic case and saturated poroelastic cases with drained and undrained boundaries are evidently different under certain circumstances, and the differences may be much larger than those in the free-field response.

关键词： Diffraction Infinitely long cylindricalcavities Obliquely incidence Layered poroelastichalf-space Indirect boundary element method(IBEM) Amplification Plane SH waves

3D scattering of obliquely incident plane SV waves by an alluvial valley embedded in a fluid-saturated, poroelastic layered half-space

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Earthquake Science 2013年第2期26卷 107-116页

作者： Zhenning Ba jianwen liang Xiongyi Mei School of Civil Engineering Tianjin University Tianjin Key Laboratory of Civil Engineering Structure and New Materials

The indirect boundary element method is used to study the 3D dynamic response of an infinitely long alluvial valley embedded in a saturated layered half-space for obli- quely incident SV waves. A wave-number transform is first applied along the valley＇s axis to reduce a 3D problem to a 2D plane strain problem. The problem is then solved in the section perpendicular to the axis of the valley. Finally, the 3D dynamic responses of the valley are obtained by an inverse wave-number transform. The validity of the method is con- firmed by comparison with relevant results. The differences between the responses around the valley embedded in dry and in saturated poroelastic medium are studied, and the effects of drainage conditions, porosity, soil layer stiffness, and soil layer thickness on the dynamic response are dis- cussed in detail resulting in some conclusions.

关键词： Saturated layered half-space 3D scattering Alluvial valley Plane SV wavesMoving Green's functions

Diffraction of plane P waves around an alluvial valley in poroelastic half-space

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Earthquake Science 2010年第1期23卷 35-43页

作者： Zhongxian Liu jianwen liang Department of Civil Engineering Tianjin University Tianjin 300072 China

Diffraction of plane P waves around an alluvial valley of arbitrary shape in poroelastic half-space is investigated by using an indirect boundary integral equation method. Based on the Green＇s fimctions of line source in poroelastic half-space, the scattered waves are constructed using the fictitious wave sources close to the interface of the valley and the density of ficti- tious wave sources are determined by boundary conditions. The precision of the method is verified by the satisfaction extent of boundary conditions, and the comparison between the degenerated solutions and available results in single-phase case. Finally, the nature of diffraction of plane P waves around an alluvial valley in poroelastic half-space is investigated in detail through nu- merical examples.

关键词： diffraction plane P waves alluvial valley poroelastic half-space indirect boundary integration equation method

Diffraction of plane SV waves by a cavity in poroelastic half-space

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Earthquake Engineering and Engineering Vibration 2009年第1期8卷 29-46页

作者： liang jianwen and Liu Zhongxian Department of Civil Engineering, Tianjin University, Tianjin 300072, China Professor PhD Candidate Department of Civil Engineering Tianjin University Tianjin China

This paper presents an indirect boundary integration equation method for diffraction of plane SV waves by a 2-D cavity in a poroelastic *** Green＇s functions of compressive and shear wave sources are derived based on Biot＇s theory. The scattered waves are constructed using fictitious wave sources close to the boundary of the cavity, and their magnitudes are determined by the boundary conditions. Verification of the accuracy is performed by：（1） checking the satisfaction extent of the boundary conditions, （2） comparing the degenerated solutions of a single-phased case with well- known solutions, and （3） examining the numerical stability of the solutions. The nature of diffraction of plane SV waves around a cavity in a poroelastic half-space is investigated by numerical examples.

关键词： poroelastic half-space cavity diffraction plane SV waves compressive wave source shear wave source Green's function pore pressure

Current Status and Future Directions in Environmental Stability of Sulfide Solid-State Electrolytes for All-Solid-State Batteries

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Energy Material Advances 2023年第1期4卷 130-143页

作者： jianwen liang Xiaona Li Changhong Wang Jung Tae Kim Rong Yang jiantao Wang Xueliang Sun Solid State Batteries Research Center GRINM(Guangdong)Institute for Advanced Materials and TechnologyFoshanGuangdong 528051China Department of Mechanical and Materials Engineering.University of Western Ontario LondonOntario N6A 5B9Canada China Automotive Battery Research Institute Co.Ltd.5th Floor No.43Mining Building North Sanhuan Middle RoadBeijing 100088China

Recently,sulfide-based solid-state electrolytes(SSEs)have attracted much attention owing to their high ionic conductivity and feasible mechanical *** environmental stability of sulfide-based SSEs is one of the critical aspects due to the possible decomposition,and ionic conductivity change will affect the fabrication and electrochemical performance of the ***,important efforts have been made to reveal and improve their environmental stability,and a timely summary of the progress is urgently *** this review,we first clarify the definition of environmental stability and its significance in the context of practical *** indicating the degradation mechanisms of sulfide-based SSEs,we summarize several effective strategies to improve their stability and also highlight the related theoretical *** stability of organic solvents of sulfide SSEs is also summarized and discussed,which may help reliable sulfide SSEs in the battery *** main target of this review is to gain insights and provide useful guidance to further improve the environmental stability of sulfide SSEs,which will finally promote the commercialization of sulfide-based all-solid-state batteries.

关键词： battery Solid sulfide

血流储备分数与冠状动脉造影指导稳定性心绞痛患者治疗效果的比较

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临床医药实践 2024年第3期33卷 163-165页

作者：梁鉴文王崇法张磊辉梁伦昌陈伟泉覃树杰罗定市人民医院广东罗定527200

目的:比较稳定性心绞痛(SAP)患者采用冠状动脉造影(CAG)与血流储备分数(caFFR)指导经皮冠状动脉介入术(PCI)治疗的效果。方法:选取2021年1月—2023年1月收治的SAP患者84例,随机分为对照组和观察组,每组42例。对照组行CAG指导的PCI治疗,... 详细信息

目的:比较稳定性心绞痛(SAP)患者采用冠状动脉造影(CAG)与血流储备分数(caFFR)指导经皮冠状动脉介入术(PCI)治疗的效果。方法:选取2021年1月—2023年1月收治的SAP患者84例,随机分为对照组和观察组,每组42例。对照组行CAG指导的PCI治疗,观察组行caFFR指导的PCI治疗,比较两组手术指标及随访指标。结果:两组手术时间比较,差异无统计学意义(P>0.05);观察组植入支架数目、住院费用及造影剂用量均少于对照组,差异有统计学意义(P0.05)。结论:与CAG指导相比,caFFR指导的PCI术可减少SAP患者植入支架数目,降低治疗费用,且未增加不良心血管事件发生率。

关键词：稳定性心绞痛冠状动脉造影血流储备分数不良心血管事件

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预制地下管廊内连续管道的纵向抗震分析

特种结构 2024年第1期41卷 65-69页

作者：王长祥李东桥梁建文黄宇昊柳晓科中国市政工程华北设计研究总院有限公司天津大学建筑工程学院

本文为研究预制地下管廊内连续管道的纵向抗震性能,在ABAQUS有限元平台构建了地基土-管廊-管道系统的精细化抗震分析模型,分析不同地震波入射角度下管廊-焊接钢管体系的地震响应。研究表明,随着地震波入射角度的增大,廊内焊接钢管的轴... 详细信息

本文为研究预制地下管廊内连续管道的纵向抗震性能,在ABAQUS有限元平台构建了地基土-管廊-管道系统的精细化抗震分析模型,分析不同地震波入射角度下管廊-焊接钢管体系的地震响应。研究表明,随着地震波入射角度的增大,廊内焊接钢管的轴力逐渐增大,在入射角60°时达到峰值;剪力峰值随入射角增大呈现出先减小后增大的趋势,在入射角45°时最小,入射角0°时达到峰值;管道的弯矩峰值随地震波入射角增大逐渐减小,在入射角0°时达到峰值。

关键词：预制地下管廊廊内连续管道土-管廊-管道系统纵向抗震