TYIN tegnestue Architects. Integrating On-Site Education and Practice

Founded by Andreas Grøntvedt Gjertsen and Yashar Hanstad, TYIN tegnestue Architects grew out of an initiative to provide sleeping accommodation for an orphanage in Thailand when the principals were only third-year architecture students. Norwegian architect Lisbet Harboe explains how the student-architects built up a practice while in schools by refocusing their studies and those of their peers on learning through their own experiences of construction.     

注塑机拉杆梯形螺纹端卸载槽的多目标优化

在用ANSYS软件对近卸载槽处梯形螺纹进行有限元分析的基础上,就拉杆梯形螺纹端卸载槽的几何特性建立其参数优化模型,以控制梯形螺纹在近卸载槽附近的最大应力、卸载槽的最大应力以及卸载槽加工量最小化为统一的目标函数.通过对拉杆在单向拉伸力作用下的多目标优化,使应力适当集中在拉杆卸载槽处,其最大应力比平均单向拉伸应力提高20%,拉杆梯形螺纹牙根在卸载槽处的最大应力降低52%,使卸载槽能够较好地发挥其卸载的作用.在偏载作用下,拉杆梯形螺纹牙根在卸载槽处的最大应力降低11.6%;并以优化结果为依据,分析了拉杆出现较大附加弯矩的原因.     

嵊州领带企业客户价值评价模型与实证分析

客户资源是领带企业竞争的焦点之一。借鉴客户生命周期价值理论研究成果，通过实地调研、访谈的方式总结客户价值评判诸因素，从客户当前价值、未来价值、潜在价值、非货币价值和保持价值5个方面分析了客户价值评价的各种影响因素，在此基础上运用模糊层次分析法（FAHP）构建嵊州领带企业订单客户价值评价模型，并且以绍兴ABC领带有限公司为例对模型进行实证分析，提出客户管理的相关建议。     

建筑物抗连续倒塌研究现状和亟待解决的问题

主要介绍了目前国外对结构进行连续倒塌评估和设计的方法,比较了各国规范相关条文的异同,概述了目前的连续倒塌试验研究方法,提出了结构连续倒塌研究中亟待解决的问题,为进一步研究提供参考。     

An experimental procedure for measuring accelerations and strains from a tie down system of a heavy nuclear transport package during a rail journey

Abstract

The transportation of nuclear waste and new nuclear fuel is an important aspect in sustaining the generation of electricity by nuclear power. The design of packages that satisfy regulatory requirements for normal operating and accident conditions is a complex engineering challenge. The ancillary equipment used to constrain the packages to their conveyance, a tie down system, is part of a multicomponent system used to transport packages. Traditionally, the individual components of the transport system have been designed in isolation. This approach does not account for the interaction between components of the system such as the conveyance, tie down system and package. The current design process for tie down systems is well established but, due to its heuristic development, suffers from uncertainties over which loading conditions should be applied. This paper presents a method for collecting measured acceleration and strain data that can be used to derive customised load cases for the design of tie down systems during rail transportation. The data was collected from a tie down system that restrained an empty TN81 package, weighing 99·7 tonnes during a routine rail journey from Barrow-in-Furness to Sellafield. Furthermore, the data can be used to validate modern computer models, allowing for the development of the previously described holistic approach to tie down system design. The results are unique because an ensemble of acceleration and strain time histories from a transport system laden with a nuclear package is unprecedented. A visual examination indicates that the loading a tie down system incurs during a rail journey consists of low magnitude accelerations. The measurement points also show that the general trend of acceleration levels is highest nearest the track and is attenuated by the package. The implications for the design of tie down systems are that two potential failure modes, fatigue and static strength, have been identified. The data provides scope for customising accurate static strength and fatigue calculations using modern computational techniques. This allows for the safety margins inherent in new designs to be determined and optimised design solutions made possible.

INS makes no representations or warranties or any kind concerning this article, express or implied, statutory or otherwise, including without limitation, warranties of accuracy or the absence of errors.     

An improved tie force method for progressive collapse resistance design of reinforced concrete frame structures

Progressive collapse of structures refers to local damage due to occasional and abnormal loads, which in turn leads to the development of a chain reaction mechanism and progressive and catastrophic failure. The tie force (TF) method is one of the major design techniques for resisting progressive collapse, whereby a statically indeterminate structure is designed through a locally simplified determinate structure by assumed failure mode. The method is also adopted by the BS8110-1:1997, Eurocode 1, and DoD 2005. Due to the overly simplified analytical model used in the current practical codes, it is necessary to further investigate the reliability of the code predictions. In this research, a numerical study on two reinforced concrete (RC) frame structures demonstrates that the current TF method is inadequate in increasing the progressive collapse resistance. In view of this, the fundamental principles inherent in the current TF method are examined in some detail. It is found that the current method fails to consider such important factors as load redistribution in three dimensions, dynamic effect, and internal force correction. As such, an improved TF method is proposed in this study. The applicability and reliability of the proposed method is verified through numerical design examples.     

最小混相压力计算方法对比分析

混相压力是确定油藏能否实现混相驱的重要依据。本文简要介绍经典的确定最小混相压力计算方法的原理，引入一种新的计算混相压力的方法，即系线解析法，解释其计算原理，对计算过程进行探讨，应用这些方法求解四组分系统的混相压力。计算结果表明：与经典的计算方法相比，系线解析法不仅能反映气驱油的多级接触和相互传质过程，且能准确可靠计算混相压力。     

OVMAT矮塔斜拉桥拉索体系的研究与应用

综合考虑各方面因素，最终确定模型试验的缩尺比例为1／1．4，转向器采用19-Ф15．24。模型设计时，混凝土采用50号，钢筋采用Ⅰ、Ⅱ级钢，选取受力最不利的C1束为试验索孔、C2束为试验备用索孔，试验模型节段含C1、C2两层索孔。节段模型试验的基本参数如下，模型总体布置如图4所示。     

The role of tie strength in assessing credibility of scientific content on facebook

Social networking sites have become a major venue for dissemination of- and discussions about science-related topics. On these platforms, message credibility assessment takes into account not only traditional cues (like scientific arguments and information source), but also new types of social cues. Of the latter, we focus on tie strength, a central component of social networking sites, which has an important role in information flow, and the role of which in the process of message credibility assessment has been so far overlooked. We also consider two important and relevant meta-cognitive measures: need for cognition and expertise perception. Applying an experimental design in Facebook (N = 324), our findings suggest that need for cognition weakens the positive associations between tie strength and perceived message credibility. Also, both expertise perception and tie strength have positive effect on perceived message credibility.     

越南阮文灵大道钢管拱桥可换式系杆施工

本文以胡志明市阮文灵大道拱桥系杆施工为例，介绍可换式系杆施工的具体方法及工程中的各项注意事项。