农村及偏远地区饮用水除氟研究

研究了农村及偏远地区地下饮用水的除氟方法及其工艺流程、发展中的除氟新方法及新材料;分析了现有饮用水除氟设施存在的问题及其原因;提出了适合于农村及偏远郊区的除氟方法及其设施的发展方向.     

基于现场试验的水文地质参数计算可视化程序设计与应用

水文地质参数的计算工作一直是工程地质和水文地质界工程师们所关注的重点问题之一,传统的计算方法比较繁琐、费时,国内外目前也没有比较全面的水文地质求参软件,因此,本文利用Visual Basic语言研究开发了一款基于现场试验的水文地质参数计算的新型软件SHP,通过数据库调用Excel文件录入数据,利用最小二乘法原理拟合直线。实现了手动配线和自动配线两种方法求参。通过南京市玄武湖隧道工程实例的校验,结果表明,该软件实用性强、计算精度较高、人机交互简单,满足工程需要。     

非加劲钢板剪力墙弹塑性设计研究

为解决钢板剪力墙难以应用国内规范设计的问题,采用有限元软件ANSYS对钢板剪力墙在剪切荷载作用下的弹塑性屈曲性能进行分析,系统比较初始缺陷、宽高比和高厚比等参数对钢板剪力墙弹塑性屈曲性能的影响,提出衡量弹塑性屈曲性能的合理参数。通过数值模拟,并结合现有规范,提出钢板剪力墙弹塑性稳定的实用设计公式。与有限元计算结果的比较表明,该公式精度良好,且便于应用。     

镁铝比对高炉低铝渣系流动性能及热稳定性影响规律

以本钢现场高炉渣成分为基础,结合粘度测定实验和热力学分析计算,研究了不同镁铝比对高炉低铝渣流动性的影响规律,计算了镁铝比对低铝渣系粘流活化能的影响,同时结合红外光谱分析,从微观结构层面阐述了镁铝比对低铝渣热稳定性的影响机理.结果表明,炉渣粘度及熔化性温度均因镁铝比的提升表现出逐渐走低的趋势,而低铝渣的温度稳定性则因炉渣中复杂结构的解聚而愈趋稳定.     

A New Strategy for Preparation of NiAl Bronze/Zn Composite by Friction Stir Processing

In this work, we successfully prepared a NAB/Zn composite using Zn wires by friction stir processing (FSP). During FSP, Zn-containing α matrix and (Fe, Ni)Al phases and nano α and CuZn grains with the size of less than 10 nm are formed on the top surface. The average microhardness of the composite is increased by 15 pct compared with the alloy without Zn, which originates from fine grains, CuZn particles strengthening, and more β′ phase.

     

Bearing behavior and failure mechanism of squeezed branch piles

The current practice for the design of squeezed branch piles is mainly based on the calculated bearing capacity of circular piles. Insufficient considerations of the load-transfer mechanism, branch effect and failure mechanism, as well as overreliance on pile load tests, have led to conservative designs and limited application. This study performs full-scale field load tests on instrumented squeezed branch piles and shows that the shaft force curves have obvious drop steps at the branch position, indicating that the branches can effectively share the pile top load. The effects of branch position, spacing, number and diameter on the pile bearing capacity are analyzed numerically. The numerical results indicate that the squeezed branch piles have two types of failure mechanisms, i.e. individual branch failure mechanism and cylindrical failure mechanism. Further research should focus on the development of the calculation method to determine the bearing capacities of squeezed branch piles considering these two failure mechanisms.     

Simplified Calculation Methods for Static Behaviors of Triple-Tower Suspension Bridges and Parametric Study

International Journal of Steel Structures - In this paper, simplified formulas to determine the static behaviors of triple-tower suspension bridges were derived, including the formulas for the...     

城市测量中SHP制作方案优化

首先汇总天津城市测量SHP数据制作中存在的常见问题,然后依次分析问题产生的原因,最后提出一套优化之后的城市测量SHP数据制作方案,并在实际工作中进行验证。验证结果表明:优化之后的数据制作方案极大地提高了SHP制作效率。     

江西赣江特大型河流定向穿越施工概述

文章主要介绍了江西南昌英雄大桥段赣江水平定向穿越工程的实施过程以及在工程中使用的几项关键技术。