问题研讨式教学法在测量学教学中的应用

本文分析总结了当前我国高等教育和班级课堂教学的现状,指出我国的高等教育已经步入了大众化时代,随着学生规模的扩大,师生比严重失调,不得不采用多个班大合堂授课的形式,传统"满堂灌"的教学方法效果较差。为此,将"问题研讨式教学法"这一先进的教学模式适时、适量地引入到测量学教学中,在培养学生的创新精神和自学能力方面收到了良好的效果。     

The extended N2 method taking into account higher mode effects in elevation

The N2 method has been extended in order to take into account higher mode effects in elevation. The extension is based on the assumption that the structure remains in the elastic range when vibrating in higher modes. The seismic demand in terms of displacements and storey drifts can be obtained by enveloping the results of basic pushover analysis and the results of standard elastic modal analysis. The approach is consistent with the extended N2 method used for plan‐asymmetric buildings. The proposed procedure was applied to three variants of three steel frame buildings used in the SAC project. The structural response was investigated for two sets of ground motions. Different ground motion intensities were used in order to investigate the influence of the magnitude of plastic deformations. The N2 results were compared with the results of nonlinear response‐history analysis, two other pushover‐based methods (modal pushover analysis (MPA) and modified MPA (MMPA)), and pushover analysis without consideration of higher modes. It was found that a considerable influence of higher modes on storey drifts is present at the upper part of medium‐and high‐rise structures. This effect is the largest in the case of elastic behaviour and decreases with ground motion intensity. The higher mode effects also depend on the spectral shape. The approximate methods (extended N2, MPA and MMPA) are able to provide fair estimates of response in the case of the test examples. Accuracy decreases with the height of the building, and with the intensity of ground motion. The N2 results are generally conservative. Copyright © 2011 John Wiley & Sons, Ltd.     

基于Benchmark模型的抑制屈曲支撑耗能减振作用分析

抑制屈曲支撑可在拉压循环荷载作用下均达到屈服,拉压承载力基本一致,滞回曲线稳定饱满,耗能能力强。基于Benchmark模型对安装抑制屈曲支撑的钢框架结构基于ANSYS的数值分析表明,抑制屈曲支撑不仅可使结构在小震时的抗侧刚度有所提高,同时在大震时通过其往复滞回变形发挥耗能减振作用,大大地降低了结构的地震响应,提高了结构的抗震性能。同时分析表明考虑高阶振型影响的能力谱分析方法是一种更为精确的分析方法。     

对广东海洋大学海洋特色定位的思考

海洋世纪呼唤海洋科技人才,召唤海洋高等教育,广东海洋大学必须增强海洋意识、加强海洋观教育、普及海洋知识、整合现有海洋资源、重新架构学科专业,才能彰显广东海洋大学的"海洋"办学特色。     

Higher-dimensional vacuum bianchi-mixmaster cosmologies

We derive some new exact 7-dimensional cosmological solutions |R⊗ I ⊗N, whereN = I, II, VI₀, VII₀, VIII and IX are the various 3-dimensional Bianchi models. The solutions given are higher-dimensional generalizations of the mixmaster cosmologies. There is a strong influence of the extra spacesN, which results in a fundamental change of the 3-dimensional cosmology.     

基于注册测绘师的高职工程测量专业教学改革研究

注册测绘师制度的推行,对我国测绘行业人员提出了更高要求,为了适应新形势下国家对测绘人才培养的需求,高职工程测量专业进行教学改革迫在眉睫。从注册测绘师所要求的知识结构和专业能力入手分析,探讨了工程测量专业课程体系、实践教学、师资队伍、教学方法与手段、学生考核评价方式以及校企合作方式的教学改革,为高职工程测量人才培养提供了保障。     

波浪水槽中非线性浅水波传播特性与模拟

通过建立解析解、进行数值模拟和物理实验，研究了波浪水槽中非线性浅水波浪传播特性，给出了数值模拟中对应造波板做正弦运动的二阶入射边界条件。数值模拟采用高阶Boussinesq方程。实验结果、数值结果和解析解进行对比，并讨论了解析解的适用范围、高次谐波的产生及三波相互作用问题。     

From EDUPUNK to Open Policy: Critical Technology Praxis within Higher Education

Emerging less than a decade ago, the term EDUPUNK sought to encapsulate the nascent rebellion against the corporatism and neoliberal ideology permeating digital aspects of higher education. A loose association of academic technologists with interests in net neutrality, open source software, hacktivism, and so on, the EDUPUNK movement has also been informing the adoption of various open practices in higher education, including open educational resources (OER). Intriguingly, university administrators and policymakers—attracted by aspects such as increased access and lower costs for students—are taking notice. In this article, I focus on developments from across the state of Virginia to introduce a critical praxis landscape from within higher education. Thus, I showcase some of the opportunities for critical technology praxis within the neoliberal(izing) university.     

以项目为基础的高职《测量学》一体化教学改革

当前的高职《测量学》教学缺乏对理论和实践的联系性研究,造成了理论教学和实践教学的脱节,从而导致学生学习目的不明确、学习兴趣不浓.针对这种状况,本文提出一种自编教学讲义:以项目为基础的理论与实践一体化教学.实践证明,这种全新的教学模式可以解决以上提出的问题,能够提高学生的专业素质能力.     

Further development of a multimodal pushover analysis procedure for seismic assessment of bridges

An improvement is first suggested to the modal pushover analysis (MPA) procedure for bridges initially proposed by the writers (Earthquake Engng Struct. Dyn. 2006; 35 (11):1269–1293), the key idea being that the deformed shape of the structure responding inelastically to the considered earthquake level is used in lieu of the elastic mode shape. The proposed MPA procedure is then verified by applying it to two actual bridges. The first structure is the Krystallopigi bridge, a 638 m‐long multi‐span bridge, with significant curvature in plan, unequal pier heights, and different types of pier‐to‐deck connections. The second structure is a 100 m‐long three‐span overpass bridge, typical in modern motorway construction in Europe, which, although ostensibly a regular structure, is found to exhibit a rather unsymmetric response in the transverse direction, mainly due to torsional irregularity. The bridges are assessed using response spectrum, ‘standard’ pushover (SPA), and MPA, and finally using non‐linear response history analysis (NL‐RHA) for a number of spectrum‐compatible motions. The MPA provided a good estimate of the maximum inelastic deck displacement for several earthquake intensities. The SPA on the other hand could not predict well the inelastic deck displacements of bridges wherever the contribution of the first mode to the response of the bridge was relatively low. Copyright © 2009 John Wiley & Sons, Ltd.