混凝土中钢筋锈蚀的电化学检测方法

综合分析了混凝土中钢筋锈蚀的非破损检测方法，在此基础上，着重剖析了常用电化学检测方法的优缺点、适用场合及其应用情况，指出了今后的发展方向。     

分层岩土介质爆炸效应的三维仿真模拟

分层岩土介质的爆炸效应是一个复杂的动力学问题,运用离散元框架内的三维梁-颗粒模型模拟分层岩土介质的爆炸效应.把介质用颗粒单元离散化,在相邻颗粒间添加梁,这样研究对象就成为一个由颗粒单元与梁网络形成的复合结构.梁的作用是使颗粒的集合体具有与初始对象近似的强度性质.用离散元法描述颗粒单元的运动,并通过相邻颗粒间的相对位移计算梁的变形,根据梁的强度准则判别梁是否存在;裂纹的产生及碎块的形成通过梁的消失来体现.然后采用矩阵位移法计算梁的受力,并反作用于对应的颗粒单元上.模拟结果表明,梁-颗粒模型可以克服以连续介质力学为基础的有限元等数值方法对于模拟大变形时的局限性,可以逼真地体现爆炸载荷下裂纹的生成、扩展以及碎块的形成及飞离母体等大运动特征,且模拟结果与试验结果基本一致,该方法可用于爆炸效应数值模拟,是一种有效的手段.     

桩筏基础荷载分担问题研究

根据高层建筑桩筏基础荷载分担问题的大量现场测试结果，采用三种简化计算方法对两个典型工程进行计算分析对比，得出荷载分担的确存在，并提出了一些建议。     

瑞利波法估算地基抗剪强度的应用

发展原位、快速、经济、无损地测试地基抗剪强度的方法具有重要的实际意义。利用粘性土非线性弹性模型、摩尔-库仑强度理论以及土的波动理论,建立剪切波速度与土体抗剪强度的关系式。通过实际工程的瑞利波法测试,证明有一定的适用性。     

A research about a method for restoration of traditional lime mortars and plasters: A staging system approach

Turkey is quite rich with historical buildings. Depending on various factors like time, increasing air pollution due to technological improvements of the present era together with insufficiency of inspection leads to the formation of damages on these buildings which are part of our historical heritage. Conservation of such buildings which are as important as historical documents should be the first and foremost target of any project. Where maintenance is insufficient, conservation and restoration attempts should replace it. What is necessary in restoration is the use of material which resembles the original material to the closest degree or, producing appropriate material which is compatible with the properties of the original material. The first dimension of the current problem is the insufficiency of resources while the second dimension stems from the lack of proper evaluation of the material to be used in conservation and restoration. This study defines the importance of mortars and plasters along with their history and the reasons of deterioration. In addition, it sets up the information flow of mortar and plaster within a systematic decision making process. The necessary experimental methods for the production of new repair mortar or plaster that can be used in determining the character analysis of original mortar and deterioration morphology are also analyzed. Thus, a method that can be used in the conservation and restoration studies is determined with this paper.     

材料对火反应实验方法比较

概括了材料对火反应特性主要的实验方法及国内外的相关标准，分析了各类方法的特点，小型实验方法一般只能测量影响燃烧过程的某个特定方面，而大型实验方法比较接近真实火灾的条件。不同的实验方法往往产生不同的分级评价结果。     

Improvement in accuracy of the finite element method in analysis of stability of Euler–Bernoulli and Timoshenko beams

The problem of buckling of the Euler–Bernoulli and Timoshenko beams is analyzed by the finite element method. Significant improvement in accuracy of the method is obtained by replacing the discontinuous function of the bending moment related to the approximation of the eigenfunction obtained by FEM by a “smoothed” function in the Rayleigh quotient. The smoothed function is obtained by fitting the discontinuous one using the least square technique.     

冻土地区桥梁基础施工

针对冻土地区天气寒冷、冰冻期长的特点,介绍了冻结法施工,探讨了其施工的主要条件、方法及注意事项,并对冻土地区桥梁基础施工进行了详细介绍,提出了提高混凝土抗冻融耐久性的措施,提高了基坑的施工速度,缩短了铁路修建的工期,减少了基坑的事故率。     

“SMW工法”深基坑围护技术

御景苑商住大楼大面积地下室深基坑围护,在场地环境受限制时采用SMW工法施工,在搅拌、提升、喷浆、插桩等工序中精心施工,有效地避免围护结构体开裂、渗水,缩短了围护工程施工工期,确保地下室工程的正常施工。     

隧道开挖对桩基影响的有限元分析

基于黄土地层情况,采用邓肯~张的非线性本构模型,运用同济曙光程序软件,建立了隧道、桩与土相互作用的二维有限元模型,讨论了黄土地层中盾构隧道开挖对邻近桩基础的影响规律。