Wharf embankment and strengthening program at the Port of Oakland

The wharf and embankment strengthening program (WESP) is a structural modification project involving approximately 12,000 linear feet of pile-supported, marginal wharf structures. WESP is necessary because the Port of Oakland plans to deepen its berths from −42′ mean lower low water (MLLW) to −52′ MLLW, in conjunction with a Federal Government-sponsored channel dredging project. Unless they are structurally reinforced prior to the dredging, the waterfront components (i.e. wharves and embankments) will be weakened by the berth deepening project. WESP is a three-phase program that establishes the existing structural and seismic capacities of waterfront components, develops designs for improvements necessary to maintain these capacities after the berth deepening, and constructs the improvements. WESP also includes consideration of seismic upgrade improvements. The Port is currently completing the first phase of the WESP program. This paper will describe the design criteria, project phasing, construction type of waterfront components, project organization, and results to date for WESP.     

PC机在控制金刚石合成工艺方面的应用

通过开发压机ＰＣ机的内在功能，编制合理的控制程序，改进了设备的工况，提高了金刚石合成工艺的控制精度。     

Seismic vulnerability evaluation of axially loaded steel built-up laced members I： experimental results

An experimental program was initiated to investigate the seismic performance of built-up laced steel brace members. Quasi-static testing of twelve typical steel built-up laced member （BLM） specimens was conducted. These were designed to span a range of parameters typically encountered for such members based on findings from a survey of commonly used shapes and details that have been historically used. The specimens were subdivided into groups of three different cross-sectional shapes, namely built-up I-shape section, and built-up box shapes buckling about the x or the y axis. Within each group, global and local buckling slenderness ratios had either kl/r values of 60 or 120, and b/t ratios of 8 or 16. The specific inelastic cyclic behavior germane to each specimen, and general observations on overall member hysteretic behavior as a function of the considered parameters, are reported. A companion paper （Lee and Bruneau 2008） investigates this observed response against predictions from analytical models, and behavior in the perspective of system performance.     

GPS系统在坝体强震监测中的授时技术与应用

在地震监测行业,由于GPS能提供准确的公众时间,授时精度高、性能稳定、维护管理方便等特点得到了普遍应用。但在水利枢纽工程的大坝强震监测中,要想对不同坝段的测点系统进行GPS统一授时,得到更高的时间精度,却存在一定困难。为此,本文重点介绍了如何解决坝体内离坝面较远测点进行GPS精确授时问题及其涉及到的技术要点,解决方案及实施方法,并简述了GPS时间信息的获取方式,对授时过程中产生延时误差的原因进行了详细分析。     

基于现场测试的斜拉桥有限元模型修正

由于多年使用,桥的结构材料等都已经发生变化,因此在研究桥的当前工作状态时,必须依照现场测试结果,将初始模型修正为符合现阶段实际情况的有限元模型。本文以黄河胜利大桥为工程背景,根据设计资料建立了该桥初始有限元模型,用ANSYS通用软件开发了索力修正程序,该程序通过调整拉索的初始应变和附加质量块,使模型索力与设计索力之间误差在5％以内。计算发现,有限元模型中的施工顺序对成桥状态有着很大影响,应通过单元生死技术进行施工模拟。本文以各级加载工况下挠度、索力的变化情况作为控制目标,最终建立了能够反映加载工况下挠度变化、索力变化的黄河胜利大桥基准有限元模型,为今后监测桥的索力变化情况进而了解整座桥的工作状态奠定了基础。     

试论岩土工程勘察报告的编写工作

岩土工程勘察报告是建筑地基基础设计和施工的重要依据。在保证外业和实验资料准确 可靠的基础上,文字报告和有关图表应按合理的程序编制。要重视现场编录、原位测试和实验资 料检查校核,使之相互吻合,相互印证。要根据岩土地质时代、成因类型、岩土性质、状态、岩 石风化程度和物理力学特征合理进行地基岩土分层。报告要充分搜集利用相关的工程地质资 料,做到内容齐全,论据充足,重点突出,正确评价建筑场地条件,地基岩土条件和特殊问题, 为工程设计和施工提供合理适用的建议。     

从概念到立法:中国战略环境评价的回顾与展望

总结了国内10年来SEA在理论研究、技术方法、实践、管理制度等方面的成果、经验、存在问题,最后指出SEA的发展趋势与建议,包括建立覆盖决策链所有环节、贯穿决策全过程的环境评价体系,基于强化规划环评与生态规划的联系提出构建相辅相成的规划与评价体系的建议,以及将SEA作为促进决策的民主化与科学化、全面落实可持续发展战略的重要手段等。     

粉喷桩在汕头商住楼工程中的试验与应用

通过对汕霜大型建筑采用粉喷桩处理地基的工程试验研究,论证了在巨厚层软土地区采用长短桩间排布设方式是解决下卧层强度问题的有效途径之怀,为深欠土地区的地基处理及基础选型提供了宝贵的实践经验。     

用VB编写高密度电法数据格式转换程序

给出了计算高密度电法记录数据对应的空间坐标的详细算法,指出了用VB设计程序时存在的问题。     

基于科学CCD的低纬子午环的数据采集系统

本文主要介绍基于科学CCD的低纬子午环数据采集系统的硬件构成及软件设计。为了能绝对而又精确地确定天体的位置 ,低纬子午环需要配备多种精密的测量装置 ,如 :GPS与时钟、 9路Reticon线阵、视频CCD、科学CCD、圆感应同步器、光栅线性位移传感器等。为了能有序地控制并采集这些装置的数据 ,我们设计了一个包含 3个PC机的数据采集与控制系统。文中将描述测量装置的功能 ,然后介绍数据采集方法及软件设计