电动土工合成材料加固软土地基实验研究

本文用电动土工合成材料(EKG)与土工织物制成电极进行了室内软土地基电渗固结模型试验,测量了电渗过程中电势分布、电流变化、吸力的变化及土体的沉降,对电渗前后土体的含水率、抗剪强度和固结曲线进行了对比,并探讨了电渗的有效性。就目前EKG材料存在的问题进行了思考,为下一步的改进给出了建议。     

底部框架砖房理论计算分析对比研究

采用三线性考虑刚度退化恢复力模型的动力计算分析程序对两试验模型进行了时程分析,为考察底部一层框架砖房和底部两层砖房实际结构的抗震性能,采用前述动力非线性程序对两实际底部砖房原型结构进行了时程分析并对其抗震性能进行了比较研究,得出底部二层框架砖房的抗震性能要优于底部一层框架砖房的结论。     

砖墙与钢筋混凝土墙组合结构设计方法的研究

对砖墙与钢筋混凝土墙组合结构的设计方法进行了研究 ,指出设计这类结构的关键技术问题 ,提出相应的设计计算方法 ,其结论对实际设计有指导意义     

Mechanical behavior of micaceous clays

This study aims to investigate the effect of mica content on the mechanical properties of clays.Commercially available ground mica was blended with a locally available clayey soil,at varying nica contents by mass of 5%,10%,15%,20%,25% and 30%,to artificially prepare various micaceous clay blends.The preliminary testing phase included consistency limits and standard Proctor compaction tests.The primary testing program consisted of unconfined compression(UC),direct shear(DS) and scanning electron microscopy(SEM) tests.The test results showed that the liquid and plastic limits exhibited a linear,monotonically increasing trend with increase in mica content.The rate of increase in the plastic limit,however,was found to be greater than that of the liquid limit,thereby leading to a gradual transition towards a non-plastic,cohesionless character.The soft,spongy fabric and high water demand of the mica mineral led to higher optimum water contents and lower maximum dry unit weights with increasing mica content.Under low confinement conditions,i.e.the UC test and the DS test at low normal stresses,the shear strength was adversely affected by mica.However,the closer packing of the clay and mica components in the matrix under high confinement conditions offsets the adverse effects of mica by inducing frictional resistance at the shearing interface,thus leading to improved strength resistance.     

Robustness of hollow clay masonry units and seismic behaviour of masonry walls

As the recent experimental investigations indicated, the robustness of masonry units is one among the most decisive parameters which define the behaviour of masonry walls when subjected to seismic loads. If local brittle failure of units occurs, the mechanism of behaviour and known relationships between the strength and ductility properties of masonry walls change. In such a case, the design values of load bearing and energy dissipation capacity of masonry walls are overestimated, although the equations and requirements specified in the codes have been taken into consideration. If brittle units are used for the construction of structural walls, the actual structure will be exposed to an increased level of seismic risk although it has been designed for earthquake loads according to codes. This is especially the case of reinforced masonry, where brittle local failure prevents the transfer of predicted forces from reinforcing steel to masonry units. In order to provide limitations for the use of hollow units with large hole volume ratio and thin shells and webs in seismic areas, a measure to define the qualitative term “sufficient robustness”, specified in Eurocode 8, should be found.     

古砖塔动力特性测试与分析研究

为了维护太原永祚寺古砖塔这一文化遗产，达到提高其对自然灾害的抵御能力，从而对塔进行了动力特性测试。介绍了在原有状态，倾斜纠偏和塔基加固后的实测结果。在实测记录的基础上，上升到理论的高度进行动力分析，并用列表的形式进行对比。通过实测结果分析，取得了三个阶段的动力特性特征和塔基附近的场地卓越周期。     

砖胎模及单面支模技术在国检大厦地下室外墙施工中的应用

国检大厦在地下室外墙结构施工中,不具备常规的双面有栓支模的条件。经过多方案比较,本文提出外墙外模采用砖砌胎模、内模采用单面支模的施工方法。     

底部框架抗震墙砖房抗震设计要点及工程应用

基于对底部框架-抗震墙结构房屋的抗震性能分析,从建筑抗震概念设计出发,给出底部抗震墙抗震刚度计算公式及抗震墙数量的简化确定方法,并在构造上进行了论述,结合工程设计实例,以供设计人员在实际设计中提供借鉴.     

饱和土体圆孔扩张的弹塑性解析解

将土体在圆孔扩张过程中的应力分布分为三个区域,基于修正剑桥模型推导了圆孔扩张过程中土体在三个区域的超孔隙水压力的解析表达式。通过对比,分析了固结比对土体中应力分布的影响。本文的分析推导可为沉桩、旁压试验、静力触探等岩土工程问题提供理论依据。     

循环荷载作用下软黏土变形特性研究

通过对饱和软黏土进行一系列应力控制的循环三轴试验 ,结合各向同性弹塑性边界面模型数值模拟 ,得出了软黏土在不排水条件下受循环荷载作用时的累积残余变形规律。