displacement shape
1.By taking axial compression ratio, local angle, stirrup space, the ratio of stirrup and etc. into consideration, the author studies the displacement ductility ratio for speical-shaped columns such as L shape, T shape and t shape.
2.Secondly, the characteristic of the displacement v. s. the applied pressure of a C-shape Bourdon tube (CBT) is studied, and a non-contact measurement of this characteristic is realized using CCD imaging and computer-image-processing technologies.
3.By making use of the experiences of the set up and measuring of the vertical displacement monitorong network of a dam, the paper briefly expounds the matters needing attention in the course of setting up and measuring the vertical displacement monitoring network, and also the problems about the selection of datum point, the network shape set up and accuracy assessment etc for the vertical displacement monitoring network of the dam have been analyzed and discussed in detail.
4.The calculation formula of the element volume,the displacement,and the volume and pressure ratio of the working substance in the element are derived. The optimizing shape parameter and vane thickness are determined. The motion of the vane and the moment acting on the rotor are analyzed.
5.In this paper,the unequidistant B—spline function is used to constructmeridional shape functions and circumferential shape functions which satisfythe periodic conditions,and the spline subdomain displacement mode is gotby interpolating firstly in the longitudinal direction and then in the circum-ferential direction for the shells of revolution.
6.To meet the demands for large space and flexible compartmentation of buildings,laminated vierendeel trusses are adopted in high-position transfer story structures.First the bearing characteristics are analyzed,in which reasonable stiffness ratio of the upper chord,middle chord,and lower chord is derived.Then combined with an actual engineering model (1∶8 similar ratio),the static loading and pseudo-dynamic tests of two models for laminated vierendeel truss used in transfer story structures are conducted,in which one model adopts reinforced concrete,and the other adopts prestressed concrete and shape steel concrete.Seismic behaviors are analyzed,including inter-story displacement,base shear-displacement skeleton curves,and equivalent viscosity-damping curves.A program is programmed to carry out the elasto-plastic dynamic analysis,and displacement time-history curves of the two models are derived.The test and analysis results show that the laminated vierendeel truss with prestressed concrete and shape steel concrete has excellent seismic behaviors.It can solve the disadvantages of laminated vierendeel trusses used in transfer story structures.Finally,some design suggestions are put forward,which can be referenced by similar engineering.
为满足建筑物大空间和灵活隔断要求,在高位转换层结构中采用迭层空腹桁架结构.首先分析了其受力性能,得出了空腹桁架各构件合理的截面刚度以及布局形式.然后结合一实际工程,进行了两榀迭层空腹桁架转换结构模型(1:8相似比)的竖向荷载下静力试验以及拟动力试验.其中一榀为普通混凝土迭层空腹桁架,另一榀配置了预应力和钢骨混凝土,对比分析了两模型的层间位移比、骨架曲线以及等效粘质阻力系数等抗震性能的比较,并进行了弹塑性动力分析.试验和分析结果表明,配置预应力和型钢混凝土的迭层空腹桁架转换结构具有良好的抗震性能,可以成功地解决迭层空腹桁架作为转换层结构所产生的弊端问题,最后对这类转换层结构提出了相应的设计建议.收藏指正
7.Through analyzing the effect of temperature and nitrogen on crude oil viscosity the influences of different nitrogen injection volume and injection modes on steam displacement are contrasted, the mechanism of nitrogen-assisted steam stimulation is clarified, which includes: ①heat carrying capacity is raised, the saturation of remaining oil is reduced after nitrogen-assisted injection is made; ②crude oil flow is enhanced because of nitrogen compression and dispersion and the change of oil flow shape; ③water back-production rate is improved by expanding the steam sweep volume and compensating in-situ energy; ④ steam distillation effect is enhanced.
8.In this study, three dimensional computed tomographic(3D CT)images were reconstructed from conventional CT scans using 3D98 software in 22 patients with facial trauma. The advantage of the 3D CT imaging technique in the diagnosis for facial trauma was discussed. Although fracture detection was superior by 2D CT, 3D images were considered superior to conventioal CT sections for the assessment of the shape, extent of fracture lines, fragment displacement and the resulting disruption of facial symmetry.
