网络拱桥──一种适合中国的桥梁

阐述了网络拱桥的特点，设计原理，节点形式及架设安装。对中国大跨度简支架桥的发展有一定的借鉴作用．     

托海水电站大坝安全运行管理实践

托海水电站自1988年11月4日下闸蓄水发电以来,已安全运行了13a。为伊犁州的发展做出了巨大的贡献,托海水电站大坝于2000年12月顺利通过首次大坝安全定期检查,被评定为正常坝。本文介绍了托海水电站在大坝安全运行和安全管理方面取得的一些经验。     

基于CFRP吊杆的下承式系杆拱桥结构性能研究

为解决系杆拱桥吊杆锈蚀及抗疲劳性能差的问题，提出了将CFRP材料应用于系杆拱桥吊杆的方法，通过对不同替换原则作用下系杆拱结构及吊杆构件的力学性能对比，确定了等面积原则作为材料替换的方法；利用有限元软件对比分析了不同荷载作用下CFRP吊杆与钢绞线材料间结构的静力响应，二者受力变化相差较小，CFRP材料可有效替代钢绞线作为系杆拱桥吊杆材料；并基于短吊杆效应对比分析了吊杆受力，与全桥结构替换相比，单吊杆替换对于实桥应用更为有效可行，推广了CFRP材料应用于吊杆拱桥的实际工程案例，为系杆拱桥的发展提供了新的思路。     

Ertha Diggs and the Ancient Stone Arch Mystery

Michael Serra describes a class project for constructing arches and examining their properties. The objective was for students to review and apply the properties of isosceles triangles, trapezoids, regular polygons, and of interior and exterior angle sums. They were to practice communicating mathematically and modeling in two and three dimensions. It is a fun two-day activity of hands-on mathematics and problem solving.     

四极滚动快速隐患定位法及其运用

结合应用实例阐述了“四极滚动快速隐患定位法”及其在堤坝隐患探测中的具体操作方法和资料解释方法     

挤压混凝土边墙在三岔河水电站混凝土面板堆石坝工程中的应用

云南保山腾冲猴桥三岔河水电站面板堆石坝迎水坡面采用挤压混凝土边墙施工方法,完全取代了传统的坝体超填、垂直碾压、削去虚土、坡面平整和斜坡碾压工艺,简化了施工程序,加快了施工进度,提高了填筑质量,降低了施工成本,成型断面规矩,维护简单。本文对此加以介绍。     

Downstream channel changes after a small dam removal: Using aerial photos and measurement error for context; Calapooia River,Oregon

Dam removal is often implemented without adequate baseline monitoring to distinguish background variability from channel changes due to the removal. This study evaluated aerial photos as substitutes for multiple‐year pre‐removal field data to assess downstream channel changes associated with a small dam removal. The Brownsville Dam, a 2.1 m tall concrete dam on the Calapooia River, Oregon, was removed in 2007. We mapped bars and the low flow channel downstream from the dam and in an upstream control reach using aerial photos (1994–2008) and in the field prior to (2007) and following (2008) removal. The locations and magnitudes of changes in bar area and wetted width, relative to errors, indicate that downstream channel changes were a result of the removal. The maximum changes (?3520 ± 1460 m² for bar area, 32 ± 8 m for wetted width) observed prior to dam removal with aerial photos were far downstream. In contrast, the maximum changes after removal were immediately below the dam (200 ± 90 m² for bar area, ?11 ± 3 m for wetted width), and small in the upstream control (?150 ± 130 m² for bar area, 9 ± 4 m for wetted width). The dominant errors were photo specific: exposure error for spring to summer comparisons, position error for photos not processed for this study and identification error for small scale photos not scanned from film. We found aerial photos to be an acceptable but coarse substitute for multi‐year pre‐removal field data, and suggest best practices to minimize errors. Copyright © 2009 John Wiley & Sons, Ltd.     

大体积混凝土温度应力有限元分析

以经典的热传导方程为理论基础,采用大型有限元程序ANSYS的热-结构耦合分析方法,对某大坝的温度场和应力场进行了模拟分析和计算,得到了大坝内的最高温度和主应力的分布,为在设计和施工过程中采取有效的防裂措施提供了指导。     

高拱坝抗震设计研究进展

本文概述了高拱坝抗震面临的关键技术问题和国内外的研究动态，简要介绍了近年来我国各有关单位结合小湾、溪洛渡等工程对高拱坝抗震进行攻关研究的目标和思路，以及当前研究的进展。内容包括拱坝体系作为宫续介质的地震反应和坝肩抗稳定方法及其在小湾拱坝工程中的实际应用，拱坝整体和有缝模型的动力试验；拱坝体系作为离散介质的地震及反应和坝肩抗震稳定分析方法；厚淤砂时坝面动压影响；以及拱坝随机震动场作用下的反应分析。     

黄土高原地区淤地坝产权制度改革与可持续发展

在沟道中建淤地坝作为黄土高原地区最主要的水土保持工程措施之一，长期以来受工程投资所限，工程建设缓慢，已建工程利用和管护脱节，年久失修的病险坝大量增加。