Use of FRP for RC Frames in Seismic Zones: Part II. Performance of Steel-Free GFRP-Reinforced Beam-Column Joints

The use of FRP as reinforcement in concrete structures has been growing rapidly due to its advantages over conventional steel reinforcement (e.g., corrosion resistance, light weight, magnetic neutrality). A potential application of FRP reinforcement is in structural concrete frames. However, current seismic design standards and detailing criteria for beam-column joints were established for steel reinforcement and may be unsuitable for FRP reinforcement due to its different mechanical properties. During recent earthquakes, many structural collapses were initiated or caused by beam-column joint failures. Since there are no detailed specifications for the application of FRP reinforcement in seismic zones, research is needed to gain a better understanding of the behaviour of FRP-reinforced concrete under seismic loading. In this study, two full-scale beam-column joint specimens reinforced with steel and GFRP, respectively, were tested in order to investigate their performance in the event of an earthquake. The control steel-reinforced specimen is detailed according to the Canadian Code (CSA A23.3-94) recommendations. The GFRP-reinforced specimen is detailed in a similar scheme but using a GFRP grid. The behaviour of the two specimens under reversed cyclic loading, their load-storey drift envelope relationship and energy dissipation ability were compared. The GFRP-reinforced specimen showed a predominantly elastic behaviour up to failure. While its energy dissipation was low, its performance was acceptable in terms of total storey drift demand.     

辐射流体力学与中子输运并行数值模拟中的联接算法

复杂物理现象通常由多类复杂的物理过程紧耦合构成,其数值模拟也通常由适用不同物理过程的多类并行应用程序紧耦合完成。如何设计这些物理过程之间的联接算法,既要保证程序之间数据传递的高效,又要保证程序各自运行和总体模拟的高效,还要保证程序各自开发的独立,是一个值得研究的课题。文章基于广泛应用于高温高压物理研究中的辐射流体力学和中子输运多物理并行数值模拟,在非结构网格上,提出了两种联接算法:完全松散联接算法和两层紧耦合联接算法。前者侧重于实现程序各自运行的高效和开发的独立,后者在前者的基础上,还权衡了数据传递和总体模拟的高效。在两台并行机的数百个处理机上,通信复杂度分析和数值实验结果表明,两种算法均是有效的,可推广应用到其他多物理并行数值模拟。特别是,两层紧耦合联接算法是高效可扩展的,取得了近似最优的并行性能。     

AFA3G定位格架条带技术研究

介绍了目前国外燃料组件高燃耗、长周期、低泄漏的发展方向;阐述了研制高燃耗燃料组件定位格架的必要性和可行性。提出了定位格架研究中的主要技术指标、研究方案和实施途径。明确了定位格架条带的研制内容和模具制造中的技术难点;给出了总体实施方案,并确定了研究目标及技术性能指标。最后对格架研制中的关键技术和实施方案及格架研制中的相关配套条件进行了分析。     

Unstructured Grid-Based Discontinuous Galerkin Method for Broadband Electromagnetic Simulations

A parallel, unstructured, high-order discontinuous Galerkin method is developed for the time-dependent Maxwell's equations, using simple monomial polynomials for spatial discretization and a fourth-order Runge–Kutta scheme for time marching. Scattering results for a number of validation cases are computed employing polynomials of up to third order. Accurate solutions are obtained on coarse meshes and grid convergence is achieved, demonstrating the capabilities of the scheme for time-domain electromagnetic wave scattering simulations.     

基于MSP430单片机的便携式智能设备的设计

以商务大楼为应用背景，介绍了一种通用性很强的便携式智能设备的设计方法，该系统可对机电设备运行，保安签到(巡更)，环境(卫生，绿化，设施)管理实施适时监控等，实现商务大楼的职能化管理，文中详细阐述了系统的硬件结构，软件流程等相关技术，并着重说明了该设备的巡更功能和串口通信。     

空心半螺栓球节点的弹塑性分析研究

采用２０节点３在元对一种新型空心半螺栓球节的弹塑性变形状态进行了有限元分析,通过节点的电测试验,证明了文中所述理论分析方法是正确的,指出了该节点有待改进之处。     

基于网格的参数自动化聚类算法

提出了一种基于网格的参数自动化聚类算法PAG，主要目的是解决传统的网格聚类算法对参数敏感的问题．算法采用参数自动化技术来处理参数，即算法开始运行时所需的参数直接由参数自动化技术中的公式计算得出，不需要用户输入任何参数．通过对大量数据集的实验表明，该算法可扩展性好，能处理任意形状和大小的聚类，能够很好地识别出孤立点或噪声，并且有很好的精度．     

Challenges and R&D opportunities of smart distribution grids in China

In this paper, 5 investigations on the current states of power distribution grids in China have been introduced that cover the surveys of the practical distribution asset utilization, the simultaneity factor of feeder loading, the load compositions and characteristics, the urban reliability and the integration of distributed generations of renewable resources. Based on the survey results in the investigations, 12 Facts are clearly presented. It shows that the challenges to modernize the distribution grids in China are to improve the asset utilization rates, the electricity efficiencies and the reliability of distribution systems, as well as to integrate increasing amount of variable distributed renewable resources. Furthermore based on the challenges, 8 R&D opportunities have been identified.     

配置式数据展现工具的设计与应用

为满足电网企业数据应用环境实时与非实时、业务处理与辅助分析等多种应用场景和多级应用部署等应用需求,尤其对如何将数据处理为信息、信息转换为知识、结果可视化展现提出了很高的要求。文章初步分析数据展现的几种模式,提出了采用FLEX工具、应用配置式的方法实现数据的可视化。通过开发配置式数据展现工具,降低电网企业数据展现开发的复杂度,提高数据展现的直观性。     

电网短路电流限制技术探析

为提高系统运行的安全性及稳定性,降低故障大电流已成为一种迫切需求.文章首先介绍了当前短路电流的发展水平,并对现有的限流技术进行了概述,且简要分析了限流技术中各自的优缺点,最后对限流应用的未来提出了展望.