转换梁截面尺寸改变对框支剪力墙结构抗震性能的影响

为了更好地分析转换梁截面尺寸的改变对框支剪力墙结构抗震性能的影响,利用结构分析软件PKPM建立了不同尺寸的转换梁,通过振型分解反应谱法研究了框支剪力墙结构的动力特性与抗震性能。结果表明:对于带梁式转换层的框支剪力墙结构,在满足建筑结构抗震要求的前提下,应尽量减小转换梁的截面尺寸。     

面向接口的C++编程技术研究

结合C++开发工程实践,分析了目前C++开发所面临的问题,包括C++缺少二进制级标准导致的可移植性问题,和C++头文件不能完全隐藏实现部分而导致的封装性问题。分析了目前C++开发的2种通知机制的问题,包括使用虚函数继承实现接收通知导致的不符合常识的问题,以及使用组件类与客户类紧耦合导致的独立性差的问题。针对以上问题,结合目前主流的面向接口的编程技术,给出了在C++下的一种实现。     

A NEW METHOD FOR PREDICTION OF PRODUCTIVITY OF FRACTURED HORIZONTAL WELLS BASED ON NON-STEADY FLOW

Hydraulic fracturing technologies of horizontal well are important ways to develop oil-gas field with low permeability. Productivity forecast of fractured horizontal wells is a difficult problem of hydraulic fracturing technologies. Basing on non-steady flow of fractures fluid during production, applying potential function principles, superposition principle and mathematical method for solving, coupling of seepage flow in the formation and pipe flow in the well bore, a new model on multi-fracture interference productivity forecast of fractured horizontal well is established in this article. The results indicate the coincidence rate between this model and practice is high. The pressure loss in the horizontal well bore has definite influence on the production status of fractured horizontal wells. The productions of different fractures in horizontal well bore are unequal, the productions of outer fractures are higher than middle fractures; the pressure in the well bore shows an uneven distribution, the pressure declines gradually from finger tip to heel end. Asymmetry of fractures may make productivity of fractured horizontal wells decline. The conclusions are instructive in designing fractured horizontal well for low permeability reservoir.     

井下水力旋流器入口结构参数试验研究

Three different inlets of hydrocyclone are studied in combination with the construction of a downhole system and hydrocyclone. By comparing the relationship between the inlet structure & dimensional parameter of hydrocyclone and separation efficiency & pressure loss, the highest efficiency is obtained from the inlet of an involute curve with increasing depth-width ratio from the three types, in which the separation efficiency and pressure loss all drops slowly, for the length of the channel decreases, while it drops rapidly in the other two. The flow guiding ability of the inlet affects the separation efficiency greatly, so the corresponding involute type of inlet of hydrocyclone fits for downhole oil-water separation is optimized, which serves as a basis for the structural design of downhole hydrocyclone.     

国产CT130变壁厚连续管性能及现场应用

为了进一步推广国产CT130变壁厚连续管产品,促进国产CT130变壁厚连续管的应用,对规格为Φ50.8 mm×(4.44～4.80)mm国产CT130变壁厚连续管不同壁厚处的微观组织及力学性能进行分析检测。结果表明,国产CT130变壁厚连续管不同壁厚组织以细晶板状铁素体+粒状贝氏体+珠光体为主,且母材与焊缝组织的性能基本一致,平均屈服强度均超过980 MPa,平均抗拉强度均超过980 MPa,硬度为306HV_1.0～366HV_1.0,抗内压强度为176.4 MPa,抗外压强度为223.3 MPa;同时,当内压为34.47MPa时,其疲劳寿命均值为219次,表现出良好的抗挤毁性能。从而说明国产CT130变壁厚连续管的各项性能均满API SPEC 5ST标准要求。     

压扁阻断下聚乙烯管道力学响应的实验研究

采用实验方法系统研究了压扁阻断工艺参数,包括压管速度、松管速度、压缩率、环境温度和管径对聚乙烯（PE）管道力学响应的影响。结果表明,压管过程中PE管道载荷随着压管速度的增大、压缩率的增大、环境温度的降低或管径的增大而增大;卸载过程中PE管道的残余变形随松管速度的增大而增大;维持阶段PE管道的载荷衰减随着压管速度的增大、压缩率的降低、管径的减小或环境温度的降低而增大。     

金属磁记忆检测信号的二维谱熵特征

金属磁记忆检测技术是能够对焊接裂纹进行早期诊断的最具有潜力的无损检测方法之一.以X70管线钢为主要研究对象,研究了其拉伸条件下金属磁记忆检测信号的二维特征谱熵分布规律,通过支持向量机模型,可以实现幅值谱熵和重心频率确定点的位置的分类,结合检测实例,得到了对焊缝中应力集中状态的诊断方法.结果表明,通过磁记忆信号二维特征谱熵的分布可以诊断出材料内部的应力集中状态,从而为利用金属磁记忆检测技术对裂纹萌生状态的诊断提供了依据.     

倾斜管内两相流流型的实验研究

为了进一步了解倾斜向上管倾角对管内空气和水二相流流型转变的影响。本实验在两相流实验室进行,记录和总结实验数据,进而获得流型图。分析了空气-水形成两相流通过管长8 m,有机玻璃直径20 mm,分别将管倾斜5°,15°和25°,所得的数据采集。通过在相同管径条件下的倾斜管在不同倾斜角下流型出现的区域对比,得到管的倾斜角度对流型变化的影响。     

基于故障树的联合站埋地管线失效分析

联合站内管线众多,输送介质复杂,且因埋入地下失效不容易发现。建立故障树模型,采用布尔代数,求得故障树的最小割集,给出故障树顶事件失效概率和底事件的结构重要度。定性与定量的探讨了联合站埋地管线失效的基本原因,为联合站管线的安全管理提供一定的理论指导。     

基于确定性系数法的区域地质灾害评价

以紫阳县地质灾害为研究对象,以ArcGIS为平台,通过选取地形地貌、构造岩性等评价因子,采用确定性系数法的概率分析,对地质灾害的诱发因素进行概率统计,进而建立量化指标体系,采用GIS叠加分析,完成了对紫阳县地质灾害发育环境、发育类型和分布规律、危险性评价等工作的研究。