Effect of masonry infills on seismic performance of a 3‐storey R/C frame with non‐seismic detailing

The objective of this study is to investigate the effect of masonry infills on the seismic performance of low‐rise reinforced concrete (RC) frames with non‐seismic detailing. For this purpose, a 2‐bay 3‐storey masonry‐infilled RC frame was selected and a 1 : 5 scale model was constructed according to the Korean practice of non‐seismic detailing and the similitude law. Then, a series of earthquake simulation tests and a pushover test were performed on this model. When the results of these tests are compared with those in the case of the bare frame, it can be recognized that the masonry infills contribute to the large increase in the stiffness and strength of the global structure whereas they also accompany the increase of earthquake inertia forces. The failure mode of the masonry‐infilled frame was that of shear failure due to the bed‐joint sliding of the masonry infills while that of the bare frame appeared to be the soft‐storey plastic mechanism at the first storey. However, it is judged that the masonry infills can be beneficial to the seismic performance of the structure since the amount of the increase in strength appears to be greater than that in the induced earthquake inertia forces while the deformation capacity of the global structure remains almost the same regardless of the presence of the masonry infills. Copyright © 2001 John Wiley & Sons, Ltd.     

韩国和马来西亚建立本国三维地心大地坐标系统的进展

介绍了韩国大地坐标系统的沿革 ,阐述了近年来韩国建立本国三维地心坐标系的工作和进展。为了对比韩国 ,简约介绍了马来西亚等国在这方面的新进展     

联合支护在软岩边坡工程中的锚固机理及应用

在高速公路路基开挖软弱岩层边坡施工中，采用以压力分散型锚索为主、锚管桩和框架梁等联合支护方案。介绍了其加固机理、施工技术等技术要点。     

云南省旅游产品结构调整研究

2003年“非典”的影响使中国旅游业受到重创。但是“非典”过后留给我们的是更多的思考:过多地依赖单一的观光旅游产品将加剧旅游业的脆弱性,旅游产品应向多元化方向发展,特别是云南旅游业,要想实现旅游业的可持续发展,旅游产品结构的调整势在必行。运用比较分析法、实证分析法和区域旅游开发理论,在分析了云南省旅游产品结构现状的基础上,研究了云南省旅游产品结构调整的必要性及调整内容,指出了丰富观光旅游内涵、度假旅游产品的重点开发、文化旅游的渗透开发、工业旅游、民族体育旅游及会展旅游等多种形式的联合开发是云南旅游业可持续发展的战略选择。     

Nonlinear Stability Analysis of Long-Span Continuous Rigid Frame Bridge with Thin-Wall High Piers

By utilizing the current finite element program ANSYS, two types of finite element models (FEM), the beam model (BM) and shell model (SM), are established for the nonlinear stability analysis of a practical rigid frame bridge-Longtanhe Great Bridge. In these analyses, geometrical and material nonlinearities are simultaneously taken into account. For geometrical nonlinearity, updated LagrangJan formulations are adopted to derive the tangent stiffness matrix. In order to simulate the nonlinear behavior of the plastic hinge of the piers, the multi-lines spring element COMBIN39 is used in the SM while the bilinear rotational spring element COMBIN40 is employed in the BM. Numerical calculations show that satisfying results can be obtained in the stability analysis of the bridge when the double coupling nonlinearity effects are considered. In addition, the conclusion is significant for practical engineering.     

现代大地测量参考系统的进展

概述现代大地测量参考系统的定义及不同参考系统之间的关系。主要讨论我国当代大地测量界常使用的3种用以表示几何位置的参考系统:1980年国家大地坐标系、全球大地测量系统1984(W G S84)、国际地球参考系统(ITRS)和一种用以表示物理位置、高程的参考系统:即1985年国家高程基准。并讨论大地测量中框架和基准的概念。     

半刚性连接钢框架有限元分析和研究

对带双腹板顶底角钢连接钢框架进行了非线性有限元分析，得到了钢框架的弯矩图以及应力梯度图等分析结果。同时进行了有限元分析结果与实验结果的对比，初步探讨了带双腹板顶底角钢连接对钢框架性能的影响。     

钢筋混凝土异形柱框架结构楼层受剪承载力计算方法

在不考虑结构整体扭转的前提下，假定异形柱框架结构中的异形柱为单向偏心受压且为弯曲型破坏，给出了异形柱正截面受弯承载力和异形柱框架结构楼层受剪承载力计算方法。方法简便实用，与试验结果比较吻合。     

国际地球参考框架2000(ITRF2000)的定义及其参数

对国际地球参考框架2000(ITRF2000)的定义、主要参数及其应满足的条件进行了研究,重点指出了它和历史上的各个ITRFyy的不同,并阐述了各个ITRFyy的联系和区别,给出了它们之间相互转换的参数。     

钢筋混凝土框架梁的变形能力及基于性能的抗震设计方法

本文以Priestley改进的Mander约束混凝土模型为基础推导了RC梁截面λbv-ξn-μbψ关系的一般计算公式和简化计算公式λbv-ξ-μbψ,建立了配箍特征值λbv、相对受压区高度ξn及曲率延性μbψ三者之间的量化关系式,用于梁截面在目标曲率延性下的变形能力设计,给出了梁截面在目标曲率延性下的设计流程图.对所设计的梁截面进行变形能力验算,均可达到设定的目标曲率延性.在简化的λbv-ξ-μbψ公式基础上建立了框架梁的性能设计方程,即λbv-ξ-θplb关系式,给出了RC框架梁基于性能的抗震设计方法的一般步骤.设计者可灵活地根据性能要求设定可接受的破损指标DI进行梁的性能设计.