无黏结部分预应力砼受弯构件裂缝宽度计算

结合无黏结部分预应力砼受弯构件的试验成果，提出了与砼结构设计规范^[1]相对应的一套无黏结部分预应力砼受弯构件裂缝宽度计算公式。经与试验结果验证得知，这套公式计算精度较高，可满足工程设计要求。     

水泥地面空鼓裂缝的成因与预防

分析了水泥地面产生空鼓裂缝的位置和形态以及成因,并提出了预防措施.     

砌块墙体抹灰中存在的质量问题及防治措施

就某综合办公楼在砌块墙体、砌筑抹灰中出现墙面裂缝、裂纹、空鼓现象进行分析，找出处理问题的方法并提出预防措施。     

水口电站4#机转轮室里衬裂纹的修复

单机容量世界最大的我国福建水口电站轴流转桨式水轮发电机组，其中4＃机组由于长期偏离原设计工况运行，致使其转轮室钢板里衬产生了严重裂纹。采用熔化极气体保护焊方法，于2002年1月末将其修复正常。     

Irradiation embrittlement monitoring of WWER-440/213 TYPE RPVs

In the paper the main goals and progress of the surveillance specimen programme for the RPVs WWER-440/213 in Jaslovské Bohunice V-2 and Mochovce NPPs are presented. At Jaslovské Bohunice V-2, the standard surveillance specimen programme (SSSP) was finished and so-called ‘Extended Surveillance Specimen Programme’ (ESSP) was prepared on the base of its critical analysis. For first two units of the Mochovce NPP completely new programmes of irradiation embrittlement monitoring called ‘Modern Surveillance Specimen Programme’ is prepared. It is based on the experience with SSSP and ESSP as well as the recommendations of IAEA experts. This programme will serve for Mochovce NPP during all planned service life. The experience of ESSP application on the 3rd and 4th units in Jaslovské Bohunice V-2 NPP are presented in the paper too.     

Dislocation emission criterion for a wedge crack under mixed mode loading

Dislocation emission criterion for a wedge crack under mixed mode loading was investigated using Airy stress function. The order of singularity at the wedge crack tip due to remote loading was found to vary with the loading mode. The plastic zones for plane stress and plane strain were studied based on von Mises' and Tresca criteria. The dislocation emission criterion was examined for both loading modes. The mechanism of crack propagation was believed to be controlled by dislocation emission. Under an action of Mode I loading, the wedge tip movement occurred when a pair of edge dislocations of Burgers vectors be ⁱ and –be ^–i were emitted from the wedge tip where b and were the magnitude of Burgers vector and the angle between the positive x axis and the line connecting from the tip to dislocation. Similarly, under an action of Mode II loading, the wedge crack tip moved as soon as either an edge dislocation of Burgers vector along the x direction was emitted from its tip or a pair of edge dislocations of Burgers vectors be ⁱ and be ^–i were emitted from the wedge tip. The conventional mechanism of crack propagation based on the energy release rate was not expected to occur. The calculated results for a few special cases were presented and compared with those reported in the literature.     

钢筋混凝土及部分预应力混凝土受弯构件实用设计方法

本文提出了钢筋混凝土及部分预应力混凝土受弯构件的实用而又经济的设计方法。可使构件正截面承载力、裂缝宽度,挠度同时都达到最佳程度的满足。     

橡皮类材料平面应力问题的裂尖场

本文采用完全非线性弹性理论,研究了橡皮类材料在Ⅰ型荷载作用下的平面应力裂纹问题,指出,裂尖变形由两个收缩区和一个扩张区组成,裂尖应力场具有R~(-2nδ)的奇异性.     

常一中换热器失效原因分析

通过对失效的常一中换热器进析了全面的检验及分析后，认为常一中换热器的壳体、管束和紧固螺栓的开裂是在含有碳酸盐的高温循环水的介质中，由于应力腐蚀而产生的沿晶脆性断裂，并提出了改进措施。     

振动磨机橡胶衬套的磨损失效分析

本文通过一个案例，对于振动磨机橡校衬套的磨损失效进行了理论分析和应用研究。