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结合工程实例 ,介绍一种楼盖垂直振动计算的简易方法。该方法利用手头现有的通用结构分析程序和规程推荐的楼盖垂直振动近似计算法 ,可进行多台振动设备作用下楼盖垂直振动的计算 相似文献
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大跨度、开敞式、轻质建筑楼盖的大量使用以及用户体验满意度要求的不断提高,使得人致荷载下的楼盖振动舒适度问题日益突出,也已成为大跨楼盖结构设计的关键问题。为此,中国电子工程设计院有限公司联合多单位编制了《建筑楼盖结构振动舒适度技术标准》(JGJ/T 441—2019),并已于2020年1月1日起实施。文章针对《标准》中单人步行荷载下楼盖结构响应的反应谱计算方法,详细说明了其理论基础、简化依据和计算步骤。进而,将反应谱方法应用于50个已建钢-混凝土组合结构楼盖、3个已建混凝土楼盖、1个木楼盖试验模型、1个已建人行桥和英国设计标准中2个范例的人致结构振动分析与舒适度评估,并与上述例子的实测值或标准计算值进行了比较。对比结果显示了反应谱方法对多类型结构人致振动分析的适用性,同时也进一步明确了阻尼比、模态质量等关键计算参数的选取原则以及反应谱方法的使用范围。 相似文献
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大跨度混凝土楼盖的竖向振动舒适度设计是GB 50010-2010规范新增的重要内容之一.由此,既有混凝土楼盖是否满足要求以及如何快速评估满足舒适度要求的楼盖跨度成为值得讨论的两个问题.收集了300多套已建混凝土楼盖的设计资料,进行分类,选择各类中具有代表性的28个实例进行了建模验算,并总结了建模计算的要点.结果表明所有计算楼盖的阶频率均高于规范限值,说明楼盖跨度25 m以下时在满足挠度和裂缝宽度的设计要求条件下可同时满足振动舒适度要求.基于连续模型并利用规范对构件挠度的限值,进一步讨论了满足振动舒适度要求的楼盖跨度简化评估方法. 相似文献
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钢构件升温计算方法对比分析 总被引:1,自引:0,他引:1
以CECS 200-2006《建筑钢结构防火技术规范》为依据,介绍钢结构抗火设计中钢构件升温模型的3种计算方法,对各方法进行详细的对比分析,并给出3种方法的适用范围。通过工程实例分析将3种方法与有限元数值模拟及试验结果进行对比。结果表明,规范中所给的三种方法的计算结果均偏于保守,以增量法公式计算的钢构件升温数值最高,简化公式法的计算结果与实际最为接近,实际工程中应用简化公式计算火灾下钢构件的升温是一种简单适用且安全的方法。 相似文献
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Geosynthetic-reinforced and pile-supported (GRPS) embankments are becoming more and more popular as this technique showed good performances in practice. Various design methods were introduced to analyze GRPS embankments. However, the applicability of these design methods was not always fully validated. This paper focuses on the review of projects containing field observations of GRPS embankments. The comparison results showed that the assumptions related to the subsoil support, geosynthetic, arching shape, and its evolution are not consistent in the analytical methods. Comparison results with twenty-five full-scale cases and six series of experiments emphasize that these available design methods produce significantly different results in predicting loads transfer mechanism. The analytical models predict arching for cohesionless fill better that for cohesive fill soils. Besides, the analytical methods which consider subsoil support such as the CUR226 and EBGEO methods give results that are in a better agreement with experimental data as compared to other methods which do not consider the subsoil support. The CUR226 (2016) analytical model seems to be able to give the best performance with measured data when compared to other design methods. Finally, the results pointed out that the limit equilibrium model is adequate and has good performance. 相似文献
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The load-carrying capacity of plated structures consisted of three-layered plates with metallic isotropic face layers and metallic or non-metallic orthotropic core is determined by means of four groups of methods, namely analytical–numerical methods, the effective width approach, numerical methods—finite element and finite strip methods as well as kinematical method based on principle of virtual velocities. Theoretical backgrounds of all applied methods are presented. Results of case studies concerning separated simply supported plate under compression and thin-walled girder under pure bending are discussed. Exemplary results of calculations are presented in diagrams. Some remarks derived from the comparative analysis of obtained results based on the methods under consideration are derived. 相似文献
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本文介绍了某工程采用多种物探技术结合钻探手段揭示场地地层结构及其分布变化规律,尤其是碎卵石持力层的埋藏分布情况取得成功的案例。综合物探技术采用了横波反射波法、高密度电法和瞬态面波法,并介绍了方法、原理和勘察效果,以及在复杂地质条件下采用综合勘察技术提高岩土工程勘察精度的可行性。 相似文献
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A. James 《Water research》1974,8(11):955-959
This paper reviews the methods used in the measurement of benthal respiration. The disadvantages of laboratory methods are stressed, in particular the technical problems in simulating flow over the substratum. Two in situ methods are described for use in lakes and streams and the results of these are compared with laboratory methods using an oxygen budget as an independent check. 相似文献
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带转换层结构侧向刚度计算的规范方法研究 总被引:1,自引:0,他引:1
根据现行规范,楼层侧向刚度的计算方法有3种。3种刚度的概念不相同,计算结果的差异也较大。本文结合实际工程对3种刚度计算方法进行了定量分析和比较,在此基础上,明确了不同刚度计算方法的适用范围。 相似文献
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以南京市某自锚式悬索桥为背景,研究推导出了两种自锚式悬索桥主缆线形的计算方法:抛物线法和分段悬链线法,并且对两种方法的计算结果进行了比较,结果表明:分段悬链线法考虑因素较全面,较抛物线法计算复杂,但结果较精确,两种方法均可应用于自锚式悬索桥的主缆线形计算。 相似文献
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不同回弹取芯修正计算方法对混凝土强度评定结果的影响 总被引:1,自引:0,他引:1
本文列举了现行规范中几种混凝土取芯修正方法,并利用多组工程实例进行了分析。结果表明,不同方法的取芯修正结果对混凝土强度的评定结果有一定的影响。 相似文献