基于GIS的混凝土坝施工可视化仿真技术及其应用

将可视化技术与仿真技术相结合，提出了基于GIS的混凝土坝施工可视化仿真技术，开发了相应的软件GVSS。GVSS是用于制定和优化混凝土坝施工进度计划的工具，提供了可视化和查询等功能。通过将GVSS应用到实际的混凝土坝施工中，证明了该项技术和软件的有效性。     

粉末注射成形制备TiC0.7N0.3颗粒增强钛基复合材料和零件

以TiC0.7N0.3粉末为颗粒增强体,采用粉末注射成形技术将其与Ti2Ni1Cr0.8Mo0.5Cu基体钛合金(T5)合成,制备了TiC0.7N0.3颗粒增强钛基复合材料.所制备的复合材料,经腐蚀性能试验、磨损性能试验以及显微组织分析,确知其物理力学性能及显微组织为相对密度＞95%,抗弯强度为950～1 150 MPa,硬度HRC35-45;可热处理,并在保持T5合金良好广谱耐蚀特性的基础上,显著提高耐磨性.复合材料中颗粒相仍为TiC0.7N0.3,加入量由3%增加到6%时,耐磨性提高45%;基体相烧结态为条状α+β相,热处理态为纤细针状α+β相.还用该技术直接近净成形制备了均质机用阀芯零件,以评价其制备和应用的技术经济特性.     

武钢磨细钢渣粉在高性能混凝土中的应用

介绍武钢钢渣粉在混凝土中应用的一系列试验,分析了钢渣粉的掺入及其对混凝土强度和凝结时间的影响。     

制备工艺对碳纤维增强碳化硅基复合材料结构和力学性能的影响

以化学气相沉积碳为界面层,聚碳硅烷为先驱体,经过10个周期的浸渍-裂解制备了三维编织碳纤维增强碳化硅复合材料(3D-Cf/SiC)。考察了碳涂层高温预处理和陶瓷先驱体第一个周期1600℃裂解对复合材料结构与性能的影响。结果表明:碳涂层高温预处理有助于复合材料密度的提高,弱化了复合材料的界面结合,从而显著提高了复合材料的力学性能,复合材料弯曲强度达到571 MPa,剪切强度51 MPa,断裂韧性18 MPa.m1/2。     

Factors affecting the external prestressing stress in externally strengthened prestressed concrete beams

The wide use of external prestressing system to strengthen reinforced and prestressed concrete members requires the full understanding of the behaviour of the strengthened members. At ultimate the stress in the external prestressing tendons need to be known in order to calculate the ultimate strength of the strengthened member. Several factors that can influence the increase in the ultimate stress in steel external prestressing tendons have been studied and well understood while the effect of these factors on tendons made from fibre reinforced plastics needs more research.

This research was carried out to study the effect of several factors on the increase in the ultimate stress in external Parafil ropes as well as external steel tendons. These factors were related to the external prestressing system, internal prestressed and ordinary bonded steel, beam geometry and material properties. Also, the accuracy of equations proposed by the Eurocode (EC2), ACI318 and BS8110 to calculate the ultimate stress in external steel and FRP prestressing tendons was examined.

The experimental and the analytical results showed that the studied factors have the same effect on both steel (up to yield) and Parafil ropes though this effect is greater in case of steel tendons. Also, factors such as tendon profile (straight or deviated), high strength of the concrete, effective tendon depth, number of deviators should be taken into consideration when calculating the ultimate stress in the external tendons.     

鞍钢2150工程轧钢厂房及超大箱形混凝土基础施工

介绍了鞍钢2150工程轧钢车间桩基与超大箱形混凝土基础结构类型以及超大体积混凝土施工原理、技术关键及施工技术要点,评述了工程的技术、经济效果.     

高温压力传感器温度漂移补偿研究

针对高温压力传感器耐高温和高压的测量的要求,设计了压阻式压力传感器硅杯式芯片版图,采用SIMOX(separationbyimplantedoxygen)技术SOI(silicononinsulator)晶片,在微加工平台上制作了该芯片,获得了差动等臂等应变的惠斯登检测电桥。对采用耐高温封装后的传感器的热零点漂移、热灵敏度漂移和零位输出的补偿作了研究,设计了补偿电路,推导了热灵敏度漂移补偿的计算公式,在通用型高温压力传感器的研发中证明其可行性和实用性,并总结出了经验公式。     

一种基于有源电桥的电容式粮食水分传感器

在传统电桥电路的基础上,设计了一种有源电桥的电容式检测电路。该电路具有灵敏度高、线性范围宽的特点。将其用于粮食水分的检测,实现了一种具有线性特性的粮食水分传感器。通过试验测试粮食的电阻抗特性,尤其是电容特性与粮食水分之间的关系,确定了电路的工作频率。试验结果表明:这种粮食水分传感器的输出电压与粮食水分之间呈良好的线性关系,可满足粮食水分在线检测的要求。     

响洪甸水下岩塞爆破堵头设计

文章对岩塞爆破时作用于堵头上的荷载进行了分析 ,介绍了混凝土堵头在岩塞爆破荷载作用下的应力和稳定情况     

刚架拱桥及桁架拱桥的设计与受力特征分析

介绍了刚架拱桥及桁架拱桥在阜阳市的应用及其型式、构造、设计和受力特征分析