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对火灾中的铝结构进行局部屈曲分析:有限元模型

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钢结构(中英文) 2009年第10期 83-84页

作者： J. Maljaars F. Soetens H.H. snijder

对温度升高时压力作用下的细长铝合金截面进行试验研究的结果已经表述在相关论文中。本文对这些试验进行了有限元模拟分析,为此构建了一个新的本构模型,用以计算火灾下的铝合金结构。从有限元模型中获得的临界温度与试验中得到的数据非... 详细信息

对温度升高时压力作用下的细长铝合金截面进行试验研究的结果已经表述在相关论文中。本文对这些试验进行了有限元模拟分析,为此构建了一个新的本构模型,用以计算火灾下的铝合金结构。从有限元模型中获得的临界温度与试验中得到的数据非常吻合(平均温差为1°C,标准偏差为7°C)。构建的有限元模型用于确定板的最大宽厚比,此时在板屈曲前已发生了完全的塑性变形。

关键词：铝蠕变模型升温有限元法火灾局部屈曲

Percutaneous closure of secundum type atr.a. septal defects:More than 5-year follow-up

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World Jour.a. of Cardiology 2015年第3期7卷 150-156页

作者： roel Jr snijder Maarten J Suttorp Jurrien M Ten Berg Martijn C Post Department of Cardiology St.Antonius Hospital

AIM: To investigate long-term efficacy of two different devices more than five years after percutaneous atr.a. septal defect(ASD) closure in ***: All patients who underwent percutaneous closure of an ASD in the St. Antonius Hospital, Nieuwegein, The Nether.a.ds, between Febr.a.y 1998 and December 2006 were included. Percutaneous closure took place under general anaesthesia and transesophageal echocardiographic moni toring. Transthoracic echocardiography(TTE) was performed 24 h post-procedure to visualize the device position and to look for residual shunting using color Doppler. All complications were registered. All patients were invited for.a. outpatient visit and contrast TTE more than 5-years after closure. Efficacy was based on the presence of a residual right-to-left shunt(rLS), graded as minimal, moderate or severe. The presence of a residual left-to-right shunt(LrS) was diagnosed using color Doppler, and was not graded. Descriptive statistics were used for patients' characteristics. Univar.a.e analysis was used to identify predictors for residual ***: In total, 104 patients(mean age 45.5 ± 17.1 years) underwent percutaneous ASD closure using an Amplatzer device(ASO) in 76 patients and a Cardioseal/Starflex device(CS/SF) in 28 patients. The mean follow-up was 6.4 ± 3.4 years. Device migration occurred in 4 patients of whom two cases occurred during the index hospitalization(1 ASO, 1 CS/SF). The other 2 cases of device migration occurred during the first 6 mo of follow-up(2 CS/SF). The recurrent thrombo-embolic event rate was similar in both groups: 0.4% per follow-up year. More than 12 mo post-ASD closure and latest follow-up, new-onset supraventricular tachyarrhythmia's occurred in 3.9% and 0% for the ASO and CS/SF group, respectively. The rLS rate at latest follow-up was 17.4%(minimal 10.9%, moderate 2.2%, severe 4.3%) and 45.5%(minimal 27.3%, moderate 18.2%, severe 0%) for the ASO- and CS/SF groups, respectively. There was no residua

关键词： Percutaneous intervention Atr.a. septal defect Closure device right-to-left interatr.a. shunt Left-to-right interatr.a. shunt Echocardiography

Pulmonary hypertension in hereditary haemorr.a.ic telangiectasia

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World Jour.a. of Cardiology 2015年第5期7卷 230-237页

作者： Veronique MM Vorselaars Sebastiaan Velthuis repke J snijder Jan Albert Vos Johannes J Mager Martijn C Post Department of Cardiology St.Antonius Hospital Department of Pulmonology St.Antonius Hospital Department of Interventional radiology St.Antonius Hospital

Hereditary haemorr.a.ic telangiectasia(HHT) is an autosomal dominant inherited disorder characterised by vascular malfor.a.ions in predominantly the brain,liverand *** hypertension(PH) is incr.a.ingly recognised as a severe complication of *** may be categorised into two distinct types in patients with ***-capillary PH most often results from a high pulmonary blood flow that accompanies the high cardiac output state associated with liver.a.teriovenous *** frequently,the HHT-related gene mutations in ENG or.a.VrL1 appear to predispose patients with HHT to develop pre-capillary pulmonary arter.a. *** between both forms of PH by right heart catheterisation is essential,since both entities are associated with severe morbidity and mor.a.ity with different tr.a.ment *** all HHT patients should be referred to an HHT centre.

关键词： Hereditary haemorr.a.ic telangiectasia High cardiac output Pulmonary arter.a. hypertension ENG ACrVL1 Pulmonary hypertension

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辊弯曲宽翼缘构件残余应力的有限元模拟

钢结构(中英文) 2011年第1期 89-89页

作者： r.C.Spoorenberg H.H.snijder J.C.D.Hoender.a.p

弯曲宽翼缘钢构件常用于建筑和桥梁中,并在室温下通过辊弯机进行弯曲。辊弯过程改变了构件残余应力分布,可能影响拱构件的弹塑性屈曲性能。考虑材料非线性、几何非线性及接触,进行数值模拟,分析辊弯过程中弯曲宽翼缘构件的残余应力。将... 详细信息

弯曲宽翼缘钢构件常用于建筑和桥梁中,并在室温下通过辊弯机进行弯曲。辊弯过程改变了构件残余应力分布,可能影响拱构件的弹塑性屈曲性能。考虑材料非线性、几何非线性及接触,进行数值模拟,分析辊弯过程中弯曲宽翼缘构件的残余应力。将模拟结果与试验结果进行比较,结果表明:下翼缘吻合很好,上翼缘吻合较好,腹板吻合一般。结果证明有限元分析方法可用于研究辊弯曲宽翼缘构件的残余应力。

关键词：残余应力曲钢辊弯曲有限元分析塑性变形

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对火灾中的铝结构进行局部屈曲分析:试验

钢结构(中英文) 2009年第10期 83-83页

作者： J. Maljaars F. Soetens H.H. snijder

对温度升高时压力作用下铝合金截面的局部屈曲进行试验研究。基于单轴拉伸试验推导出截面的应力-应变曲线。构建了一个带有加热炉的特殊试验,对压力作用下的矩形中空截面和角截面进行分析。将压力试验的结果与简化设计模型进行了对比。... 详细信息

对温度升高时压力作用下铝合金截面的局部屈曲进行试验研究。基于单轴拉伸试验推导出截面的应力-应变曲线。构建了一个带有加热炉的特殊试验,对压力作用下的矩形中空截面和角截面进行分析。将压力试验的结果与简化设计模型进行了对比。提出了确定几何缺陷和残余应力的方法。试验提供了大量的数据以供验证数值或分析模型的有效性。

关键词：局部屈曲火灾升温铝蠕变试验缺陷