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丁字及十字交叉管廊纵向地震响应分析

天津大学学报（自然科学与工程技术版） 2024年第1期57卷 21-30页

作者：李东桥严晓威梁建文赵华天津大学建筑工程学院天津300350 天津市建筑设计院天津300074

提出了丁字及十字交叉管廊纵向地震响应分析的一个改进广义反应位移法.该方法采用壳单元模拟管廊结构,以体现管廊横断面非对称形式的影响和地震作用下管廊交叉节点处的局部变形;采用非线性弹簧单元模拟预制企口接头,可反映管廊接头断面... 详细信息

提出了丁字及十字交叉管廊纵向地震响应分析的一个改进广义反应位移法.该方法采用壳单元模拟管廊结构,以体现管廊横断面非对称形式的影响和地震作用下管廊交叉节点处的局部变形;采用非线性弹簧单元模拟预制企口接头,可反映管廊接头断面的非对称形式以及预制接头的力学行为.在ABAQUS有限元平台构建了典型交叉管廊的三维壳-弹簧计算模型,采用直接刚度法求解场地地震动响应,研究了在设计地震动幅值和地震波入射角度等因素影响下,丁字及十字交叉管廊的内力及变形响应特征,并以直线形管廊的地震响应为基准,给出了两类交叉节点的影响范围及内力放大情况.结果表明,相较于直线形管廊,管廊交叉节点处的内力及变形响应均出现明显的增高,其中丁字交叉管廊的地震响应略大于十字交叉管廊.安评波小震作用下,丁字及十字交叉管廊的接头基本处于功能完好状态,中震和大震作用下超出规范限值,其中大震下达到8 mm左右,约为直线形管廊的8~9倍;两类交叉管廊的内力放大系数范围约为2~6.工程抗震设计中,可根据该结果对交叉管廊的地震响应进行初步评估.不同设计地震动幅值和地震波入射角度下,两类交叉节点对管廊地震响应的影响范围约为20~35倍预制管节段长度,在实际工程中应引起重视.相关研究结果可为交叉管廊工程的抗震设计提供参考.

关键词：交叉管廊预制管廊纵向地震响应分析改进广义反应位移法

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市政埋地供水管网抗寒潮服务可靠度分析

自然灾害学报 2024年第3期33卷 122-129页

作者：梁建文赵雅坤肖笛天津大学建筑工程学院天津300350 南开大学管理科学与工程系天津300071

提出了市政埋地供水管网抗寒潮服务可靠度分析的一个方法。针对寒潮期气温变化对供水管道温度应力和管道周围土体冰冻应力的影响,建立管道接头渗漏状态的供水管网水力分析模型,采用一次二阶矩方法计算市政埋地供水管网抗寒潮服务可靠度... 详细信息

提出了市政埋地供水管网抗寒潮服务可靠度分析的一个方法。针对寒潮期气温变化对供水管道温度应力和管道周围土体冰冻应力的影响,建立管道接头渗漏状态的供水管网水力分析模型,采用一次二阶矩方法计算市政埋地供水管网抗寒潮服务可靠度。以某城市供水管网为例进行分析,分别给出了在蓝色、黄色、橙色和红色寒潮预警下供水管网的服务可靠度。研究表明,寒潮期气温变化对市政埋地供水管网服务可靠度具有明显影响,有必要开展市政埋地供水管网寒潮可靠度分析,寒潮强度、管道接头性能、管网拓扑结构等是市政埋地供水管网服务可靠度的影响因素。研究对于市政埋地供水管网抗灾设计具有一定参考价值。

关键词：市政供水管网抗寒潮服务可靠度温度应力管道接头变形管道渗漏

基于Davidenkov本构模型的三维沉积盆地非线性地震动谱元法模拟

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岩土工程学报 2024年第7期46卷 1387-1397页

作者：巴振宁赵靖轩桑巧稚梁建文滨海土木工程结构与安全教育部重点实验室天津300350 天津大学中国地震局地震工程综合模拟与城乡抗震韧性重点实验室天津300350 天津大学土木工程系天津300350 同济大学地下建筑与工程系上海200092

为研究三维沉积盆地内低波速土体非线性反应对近断层地震动的影响,实现基于物理的全过程(震源破裂-地震波传播-复杂场地效应-近地表土体非线性反应)三维复杂场地地震动模拟,在谱元SPECFEM3D程序中进行二次开发,采用目前具有丰富工程应... 详细信息

为研究三维沉积盆地内低波速土体非线性反应对近断层地震动的影响,实现基于物理的全过程(震源破裂-地震波传播-复杂场地效应-近地表土体非线性反应)三维复杂场地地震动模拟,在谱元SPECFEM3D程序中进行二次开发,采用目前具有丰富工程应用且适用于不同土类的三参数Martin-Seed-Davidenkov本构模型,结合已有的不规则加卸载准则,通过在程序中修改每个显式时间步下的应力增量,实现了土体剪切模量的实时更新和加卸载拐点的有效识别,将土体的非线性特性纳入到三维复杂场地地震动模拟中。首先将建立的三维模型通过施加合理边界退化至一维,与一维非线性动力分析软件DEEPSOIL的结果进行了对比,验证了开发的正确性;进而将开发的程序应用于中国滇西南地区施甸盆地的非线性地震动模拟,并与相应的线性结果进行了对比。结果显示,受土体非线性的影响,施甸地区PGA和PGV较线性结果峰值均降低,且非线性土体对PGV的影响更加明显,较线性结果最大降低约30%;沉积非线性使沉积内部观测点的速度及其反应谱幅值降低,且特征频率向长周期方向移动。

关键词：非线性地震反应三维沉积盆地 Davidenkov本构模型谱元法

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地下管廊抗震研究现状综述

天津大学学报（自然科学与工程技术版） 2024年第2期57卷 209-222页

作者：梁建文陈慧芳李东桥巴振宁天津大学建筑工程学院天津300350

针对地下管廊工程建设高速发展、抗震减灾需求愈发凸显的现状,综述地下管廊抗震研究现状.首先,通过国内外以往的震害实例,对地下管廊的震害形式、震害影响因素及震害机理进行了系统性总结.其次,从拟静力试验和振动台试验两个方面总结了... 详细信息

针对地下管廊工程建设高速发展、抗震减灾需求愈发凸显的现状,综述地下管廊抗震研究现状.首先,通过国内外以往的震害实例,对地下管廊的震害形式、震害影响因素及震害机理进行了系统性总结.其次,从拟静力试验和振动台试验两个方面总结了地下管廊抗震性能的试验研究现状.再次,总结了地下管廊抗震分析的简化分析方法、动力时程方法、地震易损性评估及减隔震技术的研究现状.最后,基于文献综述提出了目前地下管廊抗震研究亟待解决的问题并做出展望,以期促进地下管廊抗震研究的发展.研究表明:地下管廊在地震作用下的破坏形式主要有混凝土剥落、裂缝贯通、接缝错位或张开、管廊受剪断裂等;地震作用下地下管廊穿越非均匀场地时动力响应的放大效应显著,地下管廊穿越软硬交互等非均匀场地时的抗震性能研究值得重视;交叉节点是地下管廊的薄弱环节,交叉管廊的抗震设计方法研究值得关注;预制管廊接头易受到地震破坏,不同类型预制管廊接头的抗震性能研究需深入探索;城市大型地下管廊系统抗震性能受到不同交叉节点和不同管廊之间的交互影响,高效的地下管廊系统建模方法和高效的简化分析方法亟待研究;城市大型地下管廊系统地震易损性分析是重要的发展方向;地下管廊的减隔震技术值得发展.

关键词：地下管廊震害拟静力试验振动台试验简化分析方法动力时程方法地震易损性减隔震技术

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

Soil pressure and pore pressure for seismic design of tunnels revisited: considering water-saturated, poroelastic half-space

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Earthquake Engineering and Engineering Vibration 2020年第1期19卷 17-36页

作者： Zhu Jun liang jianwen State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300354China School of Civil Engineering Tianjin UniversityTianjin 300354China

This paper describes a systematic study on the fundamental features of seismic soil pressure on underground tunnels, in terms of its magnitude and distribution, and further identifi es the dominant factors that signifi cantly infl uence the seismic soil pressure. A tunnel embedded in water-saturated poroelastic half-space is considered, with a large variety of model and excitation parameters. The primary features of both the total soil pressure and the pore pressure are investigated. Taking a circular tunnel as an example, the results are presented using a fi nite element-indirect boundary element(FE-IBE) method, which can account for dynamic soil-tunnel interaction and solid frame-pore water coupling. The effects of tunnel stiffness, tunnel buried depth and input motions on the seismic soil pressure and pore pressure are also examined. It is shown that the most crucial factors that dominate the magnitude and distribution of the soil pressure are the tunnel stiffness and dynamic soil-tunnel interaction. Moreover, the solid frame-pore water coupling has a prominent infl uence on the magnitude of the pore pressure. The fi ndings are benefi cial to obtain insight into the seismic soil pressure on underground tunnels, thus facilitating more accurate estimation of the seismic soil pressure.

关键词： seismic soil pressure seismic pore pressure dynamic soil-tunnel interaction water-saturated poroelastic

2.5D scattering of incident plane SV waves by a canyon in layered half-space

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Earthquake Engineering and Engineering Vibration 2010年第4期9卷 587-595页

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

This paper presents a 2.5D scattering of incident plane SV waves by a canyon in a layered half-space by using the indirect boundary element method （IBEM）. A free field response analysis is performed to provide the displacements and stresses on the boundary of the canyon where fictitious uniform moving loads are applied to calculate the Green＇s *** for the displacements and stresses. The amplitudes of the loads are determined by the boundary conditions. The free field displacements are added to the fictitious uniform moving loads induced displacements and the total response is obtained. Numerical calculations are performed for a canyon with homogenous and in one layer over bedrock. The effects of the thickness and stiffness of the layer on the amplification are studied and discussed.

关键词： layered half-space canyon plane SV wave amplification scattering surface layer indirect boundaryelement method

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

In-plane dynamic Green's functions for inclined and uniformly distributed loads in a multi-layered transversely isotropic half-space

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Earthquake Engineering and Engineering Vibration 2018年第2期17卷 293-309页

作者： Ba Zhenning Kang Zeqing liang jianwen Department of Civil Engineering Tianjin UniversityTianjin 300072China Key Laboratory of Coast Civil Structure Safety(Tianjin University) Tianjin 300072China

The dynamic stiffness method combined with the Fourier transform is utilized to derive the in-plane Green’s functions for inclined and uniformly distributed loads in a multi-layered transversely isotropic（TI）*** loaded layer is fixed to obtain solutions restricted in it and the corresponding reactions forces,which are then applied to the total system with the opposite *** adding solutions restricted in the loaded layer to solutions from the reaction forces,the global solutions in the wavenumber domain are obtained,and the dynamic Green’s functions in the space domain are recovered by the inverse Fourier *** presented formulations can be reduced to the isotropic case developed by Wolf（1985）,and are further verified by comparisons with existing solutions in a uniform isotropic as well as a layered TI halfspace subjected to horizontally distributed loads which are special cases of the more general problem *** deduced Green’s functions,in conjunction with boundary element methods,will lead to significant advances in the investigation of a variety of wave scattering,wave radiation and soil-structure interaction problems in a layered TI *** numerical results are given to investigate the influence of material anisotropy,frequency of excitation,inclination angle and layered on the responses of displacement and stress,and some conclusions are drawn.

关键词： Green's functions transversely isotropic medium multi-layered half-space stiffness method dynamic response