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基于模态数据的长细结构小损伤精确识别研究
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作者 张效忠 闫有喜 +1 位作者 孙国民 赵志峰 《力学季刊》 CSCD 北大核心 2019年第3期594-602,共9页
本文针对现有的损伤识别方法不能满足部分结构损伤识别精度要求的现状,对结构的小损伤精确识别方法开展研究.以长细结构为研究对象,对具有不同损伤位置和损伤程度的圆柱形的轻阻尼梁结构进行了数值分析和实验研究,应用数值计算方法和实... 本文针对现有的损伤识别方法不能满足部分结构损伤识别精度要求的现状,对结构的小损伤精确识别方法开展研究.以长细结构为研究对象,对具有不同损伤位置和损伤程度的圆柱形的轻阻尼梁结构进行了数值分析和实验研究,应用数值计算方法和实验确定的特征向量和特征频率对长细结构裂缝参数进行识别计算.本文在研究过程中编制了一个创新性的预测程序,通过其一次性生成目标函数图来选择合适的初始参数,从而对识别结果进行分析.研究结果表明,应用本文提出的识别方法,裂缝位置的识别误差可以控制在0.05%~0.28%范围内,裂缝深度识别误差低于7%. 展开更多
关键词 损伤识别 长细结构 模态分析 固有频率 无损检测
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超长细比设计钢板肋杆件跨单体结构悬浮全隐框玻璃幕墙系统施工技术 被引量:2
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作者 邱梁武 杜智 李晓宇 《智能城市》 2016年第11期95-,共1页
本文针对北京泰康健康管理研究中心的悬浮幕墙施工过程抗结构变形和温度变形等结构特点和施工难度,详细阐述设计攻关、超长超薄钢板起吊安装方法、超钢结构长细比设计杆件吊装后调直及结构变形控制等关键技术及难点,并通过对施工全过程... 本文针对北京泰康健康管理研究中心的悬浮幕墙施工过程抗结构变形和温度变形等结构特点和施工难度,详细阐述设计攻关、超长超薄钢板起吊安装方法、超钢结构长细比设计杆件吊装后调直及结构变形控制等关键技术及难点,并通过对施工全过程有限元仿真分析证明,该技术高效、合理,实操性强。 展开更多
关键词 超高悬浮全隐框玻璃幕墙跨单体结构比超薄钢板肋超钢结构比设计杆件
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Isolation of Immune-Relating 185/333-1 Gene from Sea Urchin(Strongylocentrotus intermedius) and Its Expression Analysis
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作者 WANG Yinan DING Jun +2 位作者 LIU Yang LIU Xuewei CHANG Yaqing 《Journal of Ocean University of China》 SCIE CAS 2016年第1期163-170,共8页
The 185/333 gene family involved in the immune response of sea urchin.One 185/333 c DNA was isolated from Strongylocentrotus intermedius,and named as Si185/333-1.Its full-length c DNA was 1246 bp in length with a 906 ... The 185/333 gene family involved in the immune response of sea urchin.One 185/333 c DNA was isolated from Strongylocentrotus intermedius,and named as Si185/333-1.Its full-length c DNA was 1246 bp in length with a 906 bp open reading frame encoding a protein of 301 aa.The molecular weight of the deduced protein was approximately 33.1 k D with an estimated PI of p H 6.26.Si185/333-1 had high identities(70%–86%) to most of Sp185/333.An extraordinary identity of 92% was found between Si185/333-1 and Sp185/333 C5 alpha(ABR22474).Moderate identities(63%–64%) were displayed between Si185/333-1 and He185/333.Si185/333-1 had similar structure to Sp185/333.A signal-peptide,a gly-rich region and a his-rich region were found in its secondary structure.RGD motif was found in gly-rich region at position 116–118aa.There was no transmembrane region in Si185/333-1.The element pattern of Si185/333-1 is different from any available pattern that identified in Sp185/333.Si185/333-1 clustered together with pattern C Sp185/333 in phylogenetic tree.The Si185/333-1 m RNA could be detected in tissues including peristomial membrane,coelomocytes,muscle of Aristotles lantern,gut and tube feet,with the highest expression level detected in peristomial membrane and a relatively low expression in ovary and testis.The temporal expression of Si185/333-1 in peristomial membrane and coelomocytes were up-regulated after bacterial,β-D-glucan and ds RNA challenges,reaching the maximum at 12 h post-stimulation.The up-regulation was more obvious in coelomocytes,and bacterial challenge triggered the highest response.These results proved that 185/333-1 gene was involved in the immune defense of S.intermedius,while more studies were necessary for its function in S.intermedius immunity. 展开更多
关键词 sea urchin Strongylocentrotus intermedius 185/333 IMMUNE
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Slenderness Ratio Influence on the Structural Behavior of Residential Concrete Tall Buildings
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作者 Tarek A. Awida 《Journal of Civil Engineering and Architecture》 2011年第6期527-534,共8页
The main concern of this paper is to study the influence of the building slenderness ratio on the structural behavior of the residential concrete tall buildings aiming to deepen structure and architect designers under... The main concern of this paper is to study the influence of the building slenderness ratio on the structural behavior of the residential concrete tall buildings aiming to deepen structure and architect designers understanding for such type of buildings. The study is emphasized only on Kuwait city design conditions for wind and seismic loadings. The paper presents an actual case study for adding two thirty stories residential towers with two different slenderness ratios to an existing residential complex. Wind loading is considered using both code values and wind tunnel results. Three dimensional finite element techniques through ETABS software are used in conducting analysis for structures presented here. A serviceability study is performed to ensure that buildings have sufficient stability to limit lateral drift and peak acceleration within the acceptable range of occupancy comfort. In addition, an ultimate strength study is carried out to verify that all the structural elements are designed to withstand factored gravity and lateral loads in a safe manner according to the international building codes. Analysis results are presented and discussed. A brief idea about foundation design of the new towers and its connection to the existing foundation is presented. Finally conclusions are summarized as guidelines for the structural professions of concrete residential tall buildings. 展开更多
关键词 Slenderness ratio residential tall buildings finite element reinforced concrete analysis and design.
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