无缝钢管张减过程张力对壁厚分布的影响

通过对典型规格张减过程的分析，研究了张力对壁厚分布的影响，并进行了试验研究和有限元模拟，通过对比验证了可靠性，基于机架伸长率计算了增厚段切除长度，为掌握张力和钢管壁厚分布之间的关系，实现预定壁厚钢管的生产提供了依据。     

Fracture experiments on through wall cracked elbows under in-plane bending moment: Test results and theoretical/numerical analyses

Fracture assessment of pipe bends or elbows with postulated through wall crack is very essential for leak-before-break qualification of primary heat transport system piping of nuclear power plants. The methodology for fracture assessment of cracked elbows is still in developing stage. Any new development in theoretical aspect requires experimental validation. However, fracture test data on cracked elbows is not so abundant as straight pipes. The earlier experiments on cracked elbows were focused mainly on the determination of limit load. Other fracture parameters e.g. crack growth, crack initiation load or crack opening displacement were not reported in the open literature. Against this backdrop, a comprehensive experimental and theoretical program on component integrity has been initiated at Reactor Safety Division (RSD) of Bhabha Atomic Research Center (BARC), India. Under this program, a number of fracture tests have been carried out on elbows with through wall circumferential/axial cracks subjected to in-plane closing/opening bending moment. These test data are then thoroughly analysed numerically through non-linear finite element analyses, analytically through limit load comparison and also through comparison of crack initiation loads by finite element and R6 methods. These test data may be utilized in future for validation of new theoretical developments in the integrity assessment of through wall cracked elbows.     

水下长隧道最小安全顶板厚度研究

根据轴线地质剖面和隧道轴线布置图,对某拟建中水下公路隧道最小安全顶板厚度的确定进行了研究,通过比较得出最合理的最小安全顶板厚度,对同类工程有很大的参考价值。     

履带式磁吸附爬壁机器人喷漆机构的设计

本文讨论了用履带式磁吸附爬壁机器人实现喷漆的问题，阐述了喷漆机构运动的实现以及如何保证喷漆连续条件．设计了可工作于平面和弧面的喷漆机构，并且在罐壁上进行了实验，达到了预期的效果     

Design optimization of 3D reinforced concrete structures having shear walls

This paper presents a computer-based method for the optimal design of three-dimensional Reinforced Concrete (RC) structures having beams subjected to shear force and bending moment, columns subjected to biaxial moments, biaxial shears and axial loads, and shear walls subjected to pure shear. Regarding the beams and columns, the design variables are the width, depth and area of longitudinal reinforcement of member sections. The design variables for the shear walls are the thickness of the wall, the area of vertical reinforcement, horizontal distance between the vertical stirrups, the area of horizontal reinforcement, vertical space between the horizontal stirrups, and the area of vertical flexural reinforcement. The Optimality Criteria (OC) method is applied to minimize the cost of the concrete, steel and formwork for the structure. ACI code [1] provisions concerning the strength and ductility of beams, columns and shear walls are taken as constraints. The constraints also impose upper and lower bounds on the dimensions of beams and columns, and on shear wall thickness, reinforcement area and the maximum and minimum vertical and horizontal spaces between the stirrups of the shear walls. Sensitivity analysis is conducted for both internal forces and the capacities of the sections of the beams, columns and shear walls. The features of the design method are illustrated by a solved example.     

网络物理防火墙的设计

介绍了网络物理防火墙的设计思想和软、硬件的实现方法，给出了具体实施步骤。所设计的网络物理防火墙，经安装调试和实际运行，在切换速度和传输速率上完全满足网络要求，实现了4种控制功能，一台PC机连接，隔离4个网络，操作方便，动作准确，适合多网络安全连接、物理隔离、高效运行的场合。     

高强配筋砼砌块剪力墙非线性动力分析

本提出了配筋砼砌块剪力墙非线性动力分析有限元模型。采用Newmark和Newton-Raphson相结合的方法，利用编制的程序对配筋砌快剪力墙的非线性地震反应进行了分析。分析中考虑了不同地震波、不同填芯率和不同高宽比等因素的影响。研究发现，不同地震波引起地震反应不同；当其它参数一定时，适当提高填芯率将对结构抗震有利。     

中频感应加热推挤式钢管热扩径工艺及亟待解决的几个问题

介绍了中频感应加热推挤式钢管扩径工艺,对扩径新老工艺经济技术条件进行了对比分析,结合三年来扩径生产实践,对主要工艺参数做了简介,提出了今后应注重研究探索的几个相关问题。     

岩溶地区施工人工挖孔桩及基岩爆破应注意的问题

徐州皇城大厦桩基工程--人工挖孔嵌岩桩在基岩爆破施工时,发生井下塌方,造成施工困难。对此,根据工程地质和现场施工情况,对爆破后的基岩进行护壁,从而消除了井下塌方事故,使工程得以顺利进展。     

框剪悬挂结构的动力特性分析

介绍了悬挂结构特点，利用奇异函数方法建立了悬挂框剪结构的侧移刚度矩阵和动力方程．采用Matlab算法语言编程计算了悬挂框剪结构的频率和阵型，对影响框剪结构动力特性的参数(主结构的侧移刚度，分层悬挂时的悬挂位置)进行了计算和讨论．