An experimental investigation on the FPZ properties in concrete using digital image correlation technique

This paper presents an experimental investigation on the properties of the fracture process zone (FPZ) in concrete using the digital image correlation (DIC) technique. Based on the experimental results, it is found that the FPZ length increases during crack propagation but decreases after the FPZ is fully developed. The FPZ length at the peak load and the maximum FPZ length increase with an increase in specimen height, but decrease by increasing the notch depth to specimen height ratio. It is also found that the crack extension length at the peak load is about 0.25 times the ligament length.     

A Facility for the Study of Pelvis and Trunk Displacements During Sitting Posture

Abstract: Pressure sores are frequent in subjects who are paralysed because of spinal cord injuries and confined to wheelchairs: to prevent sores, these subjects must get used to frequently changing their posture. Useful information to investigate change characteristics may come through studying the behaviour of healthy subjects during long periods of sitting posture: to this aim, in the Department of Biomedical Engineering of Tel Aviv University, markers were applied to the trunks of subjects who were then filmed, while in the Department of Mechanics and Aeronautics of Rome University “La Sapienza” (DMA), angular potentiometers were applied to the base of the spine of subjects sitting on a chair where a pressure map sensor was positioned. In this paper a modification of the potentiometer device is shown: linear potentiometers are also applied to the base of the spine of the subjects; so, in addition to the relations among pelvis centre of pressure (COP) displacements, and trunk rotations, it is possible to find the relations between trunk translations and trunk rotations and between trunk translations and COP displacements; so all the characteristics of the movements of the pelvis and of the trunk at the base of the spine can now be investigated and compared. The results of the tests on 10 healthy DMA students following an established movement sequence are shown: there are particularly significant relations between trunk translations and trunk rotations in the sagittal plane, and between trunk translations and COP displacements in the frontal plane.     

六里桥高速公路指挥中心结构设计

六里桥高速公路指挥中心是平立面均不规则的建筑,介绍了通过合理的结构布置控制结构在地震作用下的位移及位移比,以及连体结构设计的加强措施和设计方法,结构超长级采取的相应解决措施,内容可供同类工程设计时参考。     

混凝土构件延性评价方法的研究

阐述了三种延性计算方法,并结合一组组合柱的试验结果进行了研究,进而阐明了几种方法之间的关系,分析了影响延性的几个因素,最后指出延性与变形能力的差别与联系。     

桥墩附近基坑开挖对桥墩基础影响的数值分析

以高铁桥墩边地铁基坑围护设计为研究对象,借助有限元程序分析基坑开挖过程中对高铁桥墩桩基础的变形影响,对后期施工监测提出了理论指导意见,以期保证施工安全,杜绝安全事故隐患。     

某医院医技楼结构设计分析

通过对医技楼的结构设计分析,阐述了医技楼结构设计的特点,分析了可在±0.000加连系梁或加大框架柱截面来解决首层层高较大,楼层侧向位移较难控制的问题,计算结果表明：本工程的各项计算结果均满足规范要求,对类似工程有一定的借鉴作用。     

75 kg／m可动心轨无缝道岔实际锁定轨温的测算

结合75 kg／m可动心轨道岔在朔黄铁路中的实际应用情况,针对基层单位在日常养护维修中发现的实际锁定轨温测算偏差较大的问题进行了分析,并提出了有效的解决措施,以期指导实践,实现朔黄铁路无缝路的精细化管理。     

近断层速度脉冲地震作用下位移反应谱的研究

以424条速度脉冲记录作为统计样本,得到了弹性位移谱和等延性位移谱,并建立了与阻尼比、场地类别相对应的弹性位移谱的计算公式,分别计算了考虑及未考虑M效应影响的等延性位移谱,并进行对比分析,然后得到了等延性位移谱考虑P-△效应的修正公式,研究结果对近断层速度脉冲地震作用下结构的抗震设计具有很好的应用价值。     

非均匀层状地基的应力和位移场分析

基于前人大量的研究成果,针对圆形均布荷载和非均匀地基,建议了一种基于层状材料Kelvin基本解的数值方法,并验证了其精确性,通过对非均匀地基数值计算分析,研究了层状地基的应力和位移分布情况,以期为工程应用提供指导。     

杭州九沙大道人行通道基坑监测分析

结合杭州九沙大道1号人行通道基坑工程实例,介绍了基坑支护方式及基坑监测方案,并对基坑开挖过程中土体深层水平位移、地表沉降、地下水位变化等内容进行了现场监测结果分析,指出钻孔灌注桩结合高压旋喷桩的基坑围护方式保证了基坑支护结构的安全、基坑开挖施工的安全以及周边环境的安全。