Results 21 to 30 of about 22,491 (98)

重力-抗侧力可分钢框架体系受力性能分析

open access: yesJianzhu Gangjiegou Jinzhan, 2020
为研究重力-抗侧力可分钢框架体系的受力性能,以某个实际工程为建筑方案,利用ETABS和PKPM软件建立了15层的重力-抗侧力可分钢框架体系和刚接钢框架体系的结构模型,在地震作用下对2种体系进行弹性和弹塑性分析。经过对比分析后得到了以下结论:在用钢量基本相同的情况下,重力-抗侧力可分钢框架体系的抗侧刚度和结构性能与刚接钢框架体系的抗侧刚度和结构性能相近;重力-抗侧力可分钢框架体系的抗弯框架受力充分,塑性铰较少,能够更好地耗散地震能量;重力-抗侧力可分钢框架体系内侧梁柱的截面较小 ...
张爱林   +4 more
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A study of elasticity deformation of polymethylene chain(聚亚甲基链的弹性形变研究)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2001
本文采用旋转异构态模型,对聚亚甲基链受到无相变的弹性形变后的热力学性质进行研究,计算出在不同形变时聚亚甲基链体系的自由能、内能等热力学函数,同时还分析了应力与弹性形变的关系以及内能对弹性形变的贡献.
JIANGZhou-ting(姜舟婷)   +2 more
doaj   +1 more source

H形钢单层网壳结构形态优化研究

open access: yesJianzhu Gangjiegou Jinzhan, 2021
在圆钢管单层网壳结构中,圆钢管构件在壳体曲面内、外的计算长度不同,造成材料性能无法在两个方向上均得到充分利用。提出以H形钢为杆件形式的单层网壳结构克服了上述不足。首先通过一则算例对比分析了圆钢管和H形钢两种杆件形式在单层网壳曲面内、外的轴心受压稳定性差异,随后为进一步减小单层网壳中杆件弯矩对构件受力的影响,运用力密度法对H形钢单层网壳进行形态优化,并对比了找形前、后单层网壳的静力性能。研究结果表明,H形钢轴心受压稳定应力在壳体曲面内、外可以达到平衡且在曲面外低于同截面面积圆钢管的稳定应力 ...
闫翔宇, 巩昊, 陈志华, 张玉轩
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海上完井滑套开关工具弹性爪机构性能研究

open access: yesShiyou jixie, 2014
弹性爪机构是海上完井滑套开关工具中最重要的部件,其力学性能稳定性对于作业成败至关重要。基于受力分析和有限元模拟,建立开关工具弹性爪力学理论模型和三维有限元分析模型,研究弹性爪结构应力分布与作业性能。基于受力理论分析可知,弹性爪机构最大轴向拉力为4 116 N,最大应力为675 MPa;基于有限元模拟计算,弹性爪机构最大轴向拉力为3 924 N,最大应力747 MPa,弹性爪结构强度满足要求。功能试验结果表明,理论计算方法存在一定的误差,有限元模拟结果相对比较精确和可靠 ...
刘传刚   +4 more
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老年性聋患者的听力损失程度、言语识别能力与认知功能的相关性分析

open access: yesZhongguo tingli yuyan kangfu kexue zazhi, 2021
目的探究老年性聋患者听力损失程度、言语识别能力与认知功能的相关性。方法选择2018年7月~2020年6月我院治疗的100例老年性聋患者为研究组,同期选择100例健听者为对照组,采用纯音听阈测试、言语识别阈测试和蒙特利尔认知评估量表(montreal cognitive assessment scale,MoCA)评估老年性聋患者听力损伤程度、言语识别能力和认知功能,采用Spearman相关性分析老年性聋患者听力损伤程度、言语识别能力与认知功能的相关性。结果研究组发生认知功能障碍的风险为54 ...
代蕴冰, 刘新颖, 孟冉, 李晓瑜
doaj  

复合绝缘子的承力杆件分析

open access: yesDianci bileiqi, 2009
对热固性环氧树脂基复合材料的绝缘子承力杆件进行了分析,指出此种材质存在弹性模量低、耐热性差、易老化、力学性能的各相异性以及材料性能多呈分散性等缺点;尤其是存在水解现象。提出用高温硫化硅橡胶(HTV)作为基材,以缠绕方式和端部附件连接而成的芯体作为复合绝缘子受力杆件,直接承受拉力负荷。分析表明,将高温硫化硅橡胶为基材的复合绝缘子作承力杆件,可充分、有效地发挥玻璃纤维的承载能力,提高了各拉力等级的复合绝缘子承力杆件的可靠性、稳定性,克服了热固性环氧树脂基复合材料的缺点。
秦国富
doaj  

高铁虹桥站钢桁架-钢管混凝土柱节点性能试验研究

open access: yesJianzhu Gangjiegou Jinzhan, 2010
最近建设完成的京沪高速铁路上海虹桥站结构中,有一种钢桁架-钢管混凝土柱焊缝连接的新型节点,该节点构造和受力性能极其复杂。本文对该节点进行了1∶4缩尺模型承载力试验研究,介绍了如何实施对该复杂节点加载的试验方法,讨论了节点的受力性能、薄弱环节和破坏模式。试验表明该节点构造设计有效,具有足够的承载力,可达到设计荷载的3倍,并具有良好的塑性变形能力。但是,节点也显示出薄弱坏节,表现为在钢桁架受拉斜腹杆翼缘与节点环板竖向加劲肋的焊接部位出现开裂现象。建议适当增大受拉斜腹杆端部的翼缘弯折曲率半径 ...
楼瑜杰   +5 more
doaj  

装配式刚边框-冷弯薄壁型钢骨架组合墙体受力性能研究

open access: yesJianzhu Gangjiegou Jinzhan, 2021
冷弯薄壁型钢组合墙体主要由冷弯薄壁型钢骨架和外敷面板组成,结构轻巧,绿色环保,多用于中低层建筑,一般在施工现场拼装完成。为提升墙体的施工速度和安装效率,在墙体四周增设焊接刚性边框,提出一种新型装配式刚边框-冷弯薄壁型钢骨架组合墙体,该墙体在工厂预制完成,现场采用螺栓与周围构件连接。建立有限元模型分析面板类型、斜撑、螺钉间距、刚边框和洞口对该新型墙体受力性能的影响,提出了承载力设计方法。研究结果表明:增设斜撑能提升墙体骨架的抗侧刚度以及石膏板覆面墙体的受剪性能 ...
马杰, 王卫永, 邢永辉, 丁勇
doaj  

开孔补强波纹腹板钢梁受弯承载力性能研究

open access: yesJianzhu Gangjiegou Jinzhan, 2017
研究波纹腹板H形钢梁开孔后经钢套筒补强后的受弯性能。设计完成了两个试件的受弯承载力试验,得到了试件的荷载-位移曲线、极限荷载和破坏形态等。采用ABAQUS有限元软件对其进行数值模拟,并对其受弯承载力进行了理论分析,提出了受弯承载力的计算式。研究表明,波纹腹板H形钢梁开孔后经过补强仍具有较好的抗弯变形能力,并且具有较好的塑性性能;开孔后经过补强的波纹腹板梁在弯矩作用下腹板上几乎不存在弯曲正应力,认为截面弯矩完全由上、下翼缘承担;其抗弯承载力可采用理论公式进行设计。
邱介尧, 李国强
doaj  

钢管K形变径加强节点受力性能研究

open access: yesJianzhu Gangjiegou Jinzhan, 2020
为了研究K形节点主管变径加强连接在大跨度钢管结构中的受力性能,采用有限元软件ABAQUS对K形变径加强节点进行了3种增强模式的承载力和滞回性能的研究:增加管径及壁厚、整体只增加管径和整体增加管径及壁厚,通过比较对K形变径加强节点的受力性能作出评价;并结合公式法的计算结果,分析产生误差的原因。研究结果表明,K形变径加强节点的承载能力明显优于普通节点的承载能力,具有较好的滞回曲线和骨架曲线,表现出良好的抗震性能,研究结果可为工程设计提供参考依据。
季荣华   +4 more
doaj  

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Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

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Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

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Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

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Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

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Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

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Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

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Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

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Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

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