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门式钢管脚手架是当今国际上建筑行业中应用较为普遍的脚手架之一,在国内也正在逐步推广使用。其主要原因是门式钢管脚手架通过工厂的大批量、标准化、系列化生产,并经整体热镀锌表面处理后,承载能力大为提高,其独特的构造也使现场应用实行多功能化,拆装方便快捷,高处作业安全等等,与目前广泛使用的扣件式钢管脚手架相比,在经济上同样有着诸 相似文献
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江苏镇江电厂2×600MW机组干煤棚钢网壳工程,网架施工前搭设扣件式钢管脚手架。结合工程实际,选用参照规范,计算了钢管脚手架的最大搭设高度、稳定性以及立杆底座和地基承载力,并对其进行验算,扣件连接抗滑移和荷载偏心等均满足安全要求。 相似文献
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近年来,脚手架坍塌事故时有发生,造成了较为严重的人员伤亡和经济损失。本文以某一实际工程脚手架坍塌事故为例,从技术和管理两个角度对事故原因进行了全面剖析和总结,为类似工程采取有效预防措施提供参考。 相似文献
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本文阐述了几种现在较为常用的脚手架类型。并通过脚手架在施工过程中容易出现的问题,对其提出了一些针对性的改进措施,最后提出了几种适合我国推广的新型脚手架。 相似文献
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通过对钢结构的连接形式,如焊接连接、螺栓连接和混合连接加固进行论述,分析了各种连接的可靠性计算理论,得出了可靠性和加固的最优方法,对从事钢结构工程的技术人员具有一定的指导意义。 相似文献
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在目前的结构可靠度分析方法中,蒙特卡洛(Monte-Carlo)方法被认为是一种相对精确法。本文详细介绍了蒙特卡洛方法的电算过程,并举例对该方法的应用进行了演算。 相似文献
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Structural reliability analysis for implicit performance functions using artificial neural network 总被引:22,自引:0,他引:22
The Monte-Carlo simulation (MCS), the first-order reliability methods (FORM) and the second-order reliability methods (SORM), are three reliability analysis methods that are commonly used for structural safety evaluation. The MCS requires the calculations of hundreds and thousands of performance function values. The FORM and SORM demand the values and partial derivatives of the performance function with respect to the design random variables. Such calculations could be time-consuming or cumbersome when the performance functions are implicit. Such implicit performance functions are normally encountered when the structural systems are complicated and numerical analysis such as finite element methods has to be adopted for the prediction.To address this issue, this paper presents three artificial neural network (ANN)-based reliability analysis methods, i.e. ANN-based MCS, ANN-based FORM, and ANN-based SORM. These methods employ multi-layer feedforward ANN technique to approximate the implicit performance functions. The ANN technique uses a small set of the actual values of the implicit performance functions. Such a small set of actual data is obtained via normal numerical analysis such as finite element methods for the complicated structural system. They are used to develop a trained ANN generalization algorithm. Then a large number of the values and partial derivatives of the implicit performance functions can be obtained for conventional reliability analysis using MCS, FORM or SORM. Examples are given in the paper to illustrate why and how the proposed ANN-based structural reliability analysis can be carried out. The results have shown the proposed approach is applicable to structural reliability analysis involving implicit performance functions. The present results are compared well with those obtained by the conventional reliability methods such as the direct Monte-Carlo simulation, the response surface method and the FORM method 2. 相似文献
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通过扣件式钢管脚手架施工期失效的过程和主要因数的剖析,结合德国Bayer工程实例,提出了可靠性设计与施工在扣件式钢管脚手架工程中应用的必要性和迫切性。 相似文献
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基于可靠度理论,概括了现有工程结构可靠度的分析方法,介绍了一次二阶矩法的各种计算方法,并探讨和比较了各种方法的特点,为可靠度计算提供了一个有价值的参考。 相似文献