Ductility of FRP plated flexural members

The design of reinforced concrete (RC) flexural members such as beams, slabs and columns is intrinsically based on the inherent ductility of the member. In reinforced concrete beams and slabs, ductility is generally achieved by using ‘under-reinforced’ sections and generally governed by the neutral axis depth parameter k_u which requires ultimate failure by concrete crushing at a specified strain ε_c. As the plates of fibre reinforced polymer (FRP) plated RC beams can fracture or debond before the concrete crushes at ε_c, the k_u approach is not directly applicable. Hence, new fundamental approaches and a deeper understanding of ductility are required which are the subjects of this paper.     

华龙国际大厦混合结构构件及节点设计

论述了矩形钢管混凝土柱钢框架、混凝土核心筒结构在江西华龙国际大厦的应用，介绍了矩形钢管混凝土混合结构总体设计、节点大样及构造。     

连续加热炉在线控制系统的仿真研究

以总括热吸收率法为基础,对连续加热炉在线控制过程进行了软件仿真研究.研究内容主要包括控制算法和炉子模型两部分,控制算法研究考虑了DDC和SCC两级控制,炉子仿真模型为离线研究提供了完善的软件平台.模型以能量平衡为基础,综合考虑了炉气、钢坯、炉墙和热电偶之间的传热,实现了炉气黑度随炉气温度的动态补偿.以实际的连续加热炉为研究对象,采用加热曲线法较全面地研究了炉子一般动态和典型大幅度动态操作时的SCC决策,得出了适于在线应用的优化控制策略.     

Nonlinear seismic response analysis of reinforced concrete tube in tube structure

Super-highly reinforced concrete tube in tube structure is a developing structure system of high-rise building. The more reasonable derivation process of the multi-vertical-line-element model stiffness matrix is given.On the premise of pointing out the problems of present multi-spring element model, combined with present multivertical-line-element model for analyzing on shear wall, the model is expanded to spatial one, and the stiffness matrix of which is derived. Combined with hysteretic axial model and hysteretic shear model, it is suitable for columns,wall limbs and beams with all kinds of section form. Some examples are calculated and compared with test results,which shows that the models have relatively good accuracy. On the base of the experimental phenomenon and failure mechanism for tube in tube structure specimen, nonlinear seismic responses analysis program on the basis of the advantaged element model for tube in tube structure is developed. Calculation results are in good agreement with those of the pseudo-dynamic tests and the failure mechanism can be well reflected.     

Van Der Waals Force and Asphalt Concrete Strength and Cracking

Van der Waals force between neutral molecules is employed to characterize the interaction among molecules in asphalt cement. Several important consequences emerge from the consideration. The brittle strength of the asphalt binder is shown to be linked to the well depth of the Van der Waals potential and the mesoscopic cracks present within the asphalt binder. Moreover, the elastic modulus of asphalt binder is analytically related to the potential well depth. The strength of the asphalt concrete (AC) is estimated by considering aggregate surface characteristics and the adhesion strength between asphaltenes or resins and molecules of aggregates. These predictions can help design asphalt concrete pavement. Formulas for predicting the binder strength and the interfacial breaking strength between aggregates and binders are derived. These results are supported by reported data. Furthermore, an analytic expression for the strength of AC is given at temperature below the AC glass transition point.     

福建省吊钟岩拱桥检查装置方案设计

吊钟岩拱桥的特点是跨度大、拱高大、拱肋曲线形状为三维空间.本文介绍了吊钟岩拱桥检查装置的设计概况,包括方案比较、总体布置、结构设计等.     

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。     

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.     

爆炸冲击波作用下核电站安全壳动力分析模型

根据某国防科研课题，建立核电站安全壳在爆炸冲击波作用下的动力分析模型，讨论并分析了质点杆模型在安全壳预应力混凝土结构中的应用。质点杆模型可用于计算爆炸冲击波作用下的结构响应。     

PWR燃料元件包壳新型锆合金的堆外性能(英文)

发展了两种新型锆合金(N18,N36)作为PWR燃料元件包壳材料。研究了N18,N36两种锆合金的堆外性能。研究表明,具有均匀弥散分布的细小β-Nb或Zr(Fe,Cr)2第二相粒子的新合金表现出最好的抗腐蚀性能,N18和N36合金都有优良的耐腐蚀性能。合金的吸氢行为与其腐蚀行为成对应关系,而两种新型锆合金的吸氢比Zr-4合金的低。两种新锆合金的拉伸强度、爆破和蠕变性能也优于Zr-4合金。此外,两种新锆合金的热物理性能、织构和应力腐蚀行为相当或优于Zr-4合金。