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Shaking table comparative test and associated study of a stepped wall-frame structure

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Earthquake Engineering and Engineering Vibration 2014年第3期13卷 471-485页

作者： Xu Weixiao sun jingjiang Yang Weisong Du Ke Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering Mechanics China Earthquake Administration

A new structural system called a stepped wall-frame structure is proposed in this study to solve the bottom yielding problem of RC frames, which widely occurred during previous earthquakes such as thc Wcnchuan and Yushu earthquakes in China. A 1/5 scale ordinary RC frame model and a stepped wall-frame model were subjected to shake table motions together to study the seismic behavior of the new structural system. This paper presents the dynamic characteristics, the seismic responses and the failure and collapse mechanism of the two models under low, moderate and high intensity shaking. The test results and further analysis demonstrate that the seismic performance of stepped wall-frame structures is superior to ordinary RC frames in terms of the well-controlled deformation pattern and more uniformly distributed damage. The stepped wall can effectively suppress the bottom yielding mechanism, and is simple, economical and practical tbr engineering practice.

关键词： stepped wall-flame strt, cture damage mechanism control shake table test drift ratio collapse mechanism

Lithium bis(oxalate)borate crosslinked polymer electrolytes for high-performance lithium batteries

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Journal of Energy Chemistry 2021年第4期30卷 228-235页

作者： Xiao Wang Jujie sun Changhao Feng Xiujuan Wang Minghan Xu jingjiang sun Ning Zhang Jun Ma Qingfu Wang Chengzhong Zong Guanglei Cui Key Laboratory of Rubber-plastics Ministry of EducationSchool of Polymer Science and EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongChina Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of SciencesQingdao 266101ShandongChina

Solid electrolytes play a vital role in solid-state Li secondary batteries,which are promising high-energy storage devices for new-generation electric ***,obtaining a suitable solid electrolyte by a simple and residue-free preparation process,resulting in a stable interface between electrolyte and electrode,is still a great challenge for practical ***,we report a self-crosslinked polymer electrolyte(SCPE)for high-performance lithium batteries,prepared by a one-step method based on 3-methoxysilyl-terminated polypropylene glycol(SPPG,a liquid oligomer).It is worth noting that lithium bis(oxalate)borate(Li BOB)can react with SPPG to form a crosslinked structure via a curing *** self-formed polymer electrolyte exhibits excellent properties,including high roomtemperature ionic conductivity(2.6×10^(-4) S cm^(-1)),wide electrochemical window(4.7 V),and high Li ion transference number(0.65).The excellent cycling stability(500 cycles,83%)further highlights the improved interfacial stability after the in situ formation of SCPE on the electrode ***,this self-formation strategy enhances the safety of the battery under mechanical ***,the present self-crosslinked polymer electrolyte shows great potential for applications in high-performance lithium batteries.

关键词： Self-formed Crosslinking structure Polymer electrolyte Lithium batteries

Damage to urban buildings in zones of intensities Ⅷ and Ⅶ during the Wenchuan earthquake and discussion on some typical damages

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Earthquake Science 2009年第2期22卷 165-173页

作者： jingjiang sun Yuhong Tang Chao Zheng Hongbin Shi Lin Lin Zhongxian sun Institute of Engineering Mechanics China Earthquake Administration Harbin 150080 China

The outline and typical characteristics of damages to building in Jiangyou city and Anxian county （intensity Ⅷ）, Mianyang city and Deyang city （intensity Ⅶ） are introduced in the paper. The damage ratios, based on the sample statistics of multi-story brick buildings together with multi-story brick buildings with RC frame at first story （BBF）, are presented. Then some typical damages, such as horizontal cricks of brick masonry buildings, X-shaped cricks on the walls under windows, the damages to columns, beams and infill walls of frame buildings and the damage to half circle-shaped masonry walls, are discussed.

关键词： Wenchuan earthquake damage to building seismic intensity

Bioinspired coacervate-based bioinks for construction of multiscale tissue engineering scaffolds

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Nano Research 2024年第9期17卷 8209-8219页

作者： Zhongwei Guo Shiqiang Zhang Yilin Guo Jingjing Xia Xiao Wu Hao Hu Rongcheng Hu Fangli Huang Qiulei Gao Chun Liu jingjiang Qiu Wei sun School of Mechanics and Safety Engineering Zhengzhou UniversityZhengzhou 450001China Department of Mechanical Engineering and Mechanics Tsinghua UniversityBeijing 100084China Precision Medicine Institute Guangdong Provincial Key Laboratory of Orthopedics and TraumatologyThe First Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510080China Department of Mechanical Engineering Drexel UniversityPhiladelphiaPA 19104USA

Engineering hydrogels that resemble biological tissues of various lengths via conventional fabrication techniques remains ***-dimensional(3D)bioprinting has emerged as an advanced approach for constructing complex biomimetic 3D architectures,which are currently restricted by the limited number of available bioinks with high printability,biomimicry,biocompatibility,and proper mechanical *** by ubiquitous coacervation phenomena in biology,we present a unique mineral-biopolymer coacervation strategy that enables the hierarchical assembly of nanoclay and recombinant human collagen(RHC).This system was observed to undergo a coacervation transition(liquid‒liquid phase separation)*** formed dense phase separated from its supernatant is the coacervate of clay-RHC-rich complexes,where polymer chains are sandwiched between silicate *** dynamics simulation was first used to verify and explore the coacervation ***,the coacervates were demonstrated to be potential bioinks that exhibited excellent self-supporting and shear-thinning viscoelastic *** extrusion-based printing,the versatility of the bioink was demonstrated by reconstructing the key features of several biological tissues,including multilayered lattice,vascular,nose,and ear-like structures,without the need for precrosslinking operations or support ***,the printed scaffolds were cytocompatible,elicited minimal inflammatory responses,and promoted bone regeneration in calvarial defects.

关键词： bioinks coacervation mineral-biopolymer nanoclay tissue engineering scaffold

四川芦山7.0级地震中非抗震设防民居震害特征

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建筑结构学报 2014年第5期35卷 157-164页

作者：曲哲钟江荣孙景江中国地震局工程力学研究所河北三河065201 中国地震局地震工程与工程振动重点实验室黑龙江哈尔滨150080

发生于2013年4月20日的芦山7.0级地震波及川西地区多个县市,造成大量人员伤亡和经济损失。与震害较轻的钢筋混凝土和约束砌体结构相比,大量非抗震设防的无约束砌体结构和穿斗木构架民居建筑受损严重。在简要描述无约束砌体结构震害特征... 详细信息

发生于2013年4月20日的芦山7.0级地震波及川西地区多个县市,造成大量人员伤亡和经济损失。与震害较轻的钢筋混凝土和约束砌体结构相比,大量非抗震设防的无约束砌体结构和穿斗木构架民居建筑受损严重。在简要描述无约束砌体结构震害特征的基础上,介绍了川西穿斗木构架的结构组成,总结了其柱脚滑移、纤榫脱出、整体歪斜、填充墙倒塌等典型震害,分析了穿斗木构架中砌体填充墙的结构作用,并给出综合考虑木构架和砌体填充墙的损伤状态以确定整体结构破坏等级的建议。通过对某高烈度区域穿斗木构架和无约束砌体结构民居建筑的破坏等级统计数据的比较,认为穿斗木构架具有更高的抗震性能。

关键词：芦山地震震害调查穿斗木构架无约束砌体结构砌体填充墙破坏等级

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计算模型对框架结构梁柱内力影响研究

地震工程与工程振动 2012年第2期32卷 90-97页

作者：石宏彬孙景江中国地震局工程力学研究所黑龙江哈尔滨150080 黑龙江工程学院黑龙江哈尔滨150050

结构抗震设计的基本原则之一是保证"强柱弱梁",但汶川地震等大量实际震害表明这一抗震设计目标并未能很好地实现。针对此问题,已开展大量研究,探讨了楼板、填充墙以及梁、柱、板配筋等因素对形成"强梁弱柱"的影响。本文则从计算模型方面... 详细信息

结构抗震设计的基本原则之一是保证"强柱弱梁",但汶川地震等大量实际震害表明这一抗震设计目标并未能很好地实现。针对此问题,已开展大量研究,探讨了楼板、填充墙以及梁、柱、板配筋等因素对形成"强梁弱柱"的影响。本文则从计算模型方面,即结构分析中广泛采用的模型、精细有限元模型和楼板与梁分别考虑的模型,对梁柱内力影响进行了对比研究。结果表明,计算模型对梁、柱弯矩比有较大影响,是形成"强梁弱柱"的重要影响因素。

关键词：强柱弱梁框架结构计算模型

楼板对RC空间框架结构抗连续倒塌性能影响试验研究

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土木工程学报 2019年第6期52卷 14-23页

作者：杜轲滕楠燕登孙景江中国地震局工程力学研究所黑龙江哈尔滨150080 中国地震局地震工程与工程振动重点实验室黑龙江哈尔滨150080

为研究楼板对RC空间框架结构抗连续倒塌性能的影响作用,文章以汶川地震中完全倒塌的漩口中学教学楼为原型结构,设计3个单层2×2跨1/3缩尺模型,包括2个带楼板子结构和1个纯框架子结构,通过拟静力加载试验研究RC框架结构在拆除中柱状态下... 详细信息

为研究楼板对RC空间框架结构抗连续倒塌性能的影响作用,文章以汶川地震中完全倒塌的漩口中学教学楼为原型结构,设计3个单层2×2跨1/3缩尺模型,包括2个带楼板子结构和1个纯框架子结构,通过拟静力加载试验研究RC框架结构在拆除中柱状态下的连续倒塌破坏过程。试验结果表明:纯框架子结构首先进入梁机制阶段,框架梁内产生轴向压力,产生'压拱效应',在梁端部截面抗弯承载力丧失后,进入悬链线机制阶段,依靠梁内部钢筋拉结力抵抗上部荷载。对比分析带楼板子结构与纯框架子结构试验结果,由于楼板的'薄膜效应'使梁机制峰值承载力提高了145%,悬链线机制峰值承载力提高了75%,楼板显著提高了梁机制和悬链线机制的抗连续倒塌能力。增加板厚增加梁板的'压拱效应',极大提高梁机制承载力,然而大变形下梁板开始不协同作用,板发生冲切破坏,降低了悬链线阶段承载力和延性。

关键词： RC空间框架结构连续倒塌悬链线机制薄膜效应楼板

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不同地震动参数与地震烈度相关性对比研究

地震工程与工程振动 2011年第1期31卷 6-10页

作者：林淋孙景江中国地震局工程力学研究所黑龙江哈尔滨150080

本文以美国加州3次破坏性地震和2008年中国汶川Ms8.0地震中所获得的强震记录作为数据源,应用最小二乘法进行线性回归,得到了不同地震动参数与烈度间的相关性。统计发现,在地面加速度峰值、地面速度峰值等16种描述地震动强度的参数中,烈... 详细信息

本文以美国加州3次破坏性地震和2008年中国汶川Ms8.0地震中所获得的强震记录作为数据源,应用最小二乘法进行线性回归,得到了不同地震动参数与烈度间的相关性。统计发现,在地面加速度峰值、地面速度峰值等16种描述地震动强度的参数中,烈度识别正确率及相关性最好的两个参数分别是标准累积绝对速度和谱烈度。

关键词：仪器烈度标准累积绝对速度谱烈度汶川地震

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芦山7.0级地震砌体结构的震害特征

地震工程与工程振动 2013年第3期33卷 27-35页

作者：曲哲钟江荣孙景江中国地震局工程力学研究所中国地震局地震工程与工程振动重点实验室河北三河065201

四川芦山7.0级强烈地震影响区域内有大量的砌体结构房屋,既有未采取任何抗震构造措施的非约束砌体结构,也有设置了圈梁和构造柱的约束砌体结构。文中首先简要讨论了本次地震强震动特性,表明其高频成分丰富,反应谱中低频部分衰减较快,是... 详细信息

四川芦山7.0级强烈地震影响区域内有大量的砌体结构房屋,既有未采取任何抗震构造措施的非约束砌体结构,也有设置了圈梁和构造柱的约束砌体结构。文中首先简要讨论了本次地震强震动特性,表明其高频成分丰富,反应谱中低频部分衰减较快,是刚性结构和柔性结构地震破坏表现差别较大的原因之一;继而论文重点以现场震害调查资料为基础,总结了不同烈度区、不同类型砌体结构的震害特征;高烈度区不同类型砌体结构的震害程度和破坏比对比表明,约束砌体结构的抗震性能明显优于非约束砌体结构。

关键词：芦山地震非约束砌体结构约束砌体结构破坏比