后张法预应力组合箱梁施工技术控制

后张拉预应力组合箱梁这种结构形式由于其结构轻盈、建筑高度小,配筋少等优点,在国内高等级公路中普遍使用。本文通过对后张法预应力组合箱梁施工技术以及操作方法进行了论述,希望可以提高箱梁的施工质量,保证工序的顺利进行。

后张法预应力组合箱梁承载能力评价与研究

介绍甬台温高速公路乐清段预应力组合箱梁承载能力的试验与评价的主要方法，并给出了理论计算值和实测值。理论分析和实测表明，该箱梁的受力和变形性能良好，实际承载能力达到设计荷载要求。

外载荷作用下塔器开孔补强计算探讨

设计塔器时除应考虑内压、外压和液柱静压力外,还应考虑风载荷、地震载荷、偏心载荷、容器自重及管道推力等其他外载荷。当风载荷和地震载荷起主要作用时,按相关标准提供的等面积法(仅考虑压力载荷)进行塔器开孔补强设计有时是不安全的。提出采用组合应力法校核塔器开孔处的强度,并结合工程实例论证了将组合应力法和等面积法相结合进行塔器开孔补强计算的必要性。

Wind Turbine Gearbox Reliability Analysis Based on the System Level Stress-Strength Model

In order to estimate the reliability of wind turbine gearbox based on the system level, a generalized stress-strength model is introduced. Considering that the system works properly under a variety of random stresses which affect every component, the total stress on the system is given by a known linear combination of the stresses of all components. Then the strength of the system can be viewed as a linear combination of the strengths of relative components. In this model, stress and strength are independent of each other. Reliability of the system is the probability that strength exceeds stress. Finally, the reliability of wind turbine gearbox is estimated by the multivariable reliability calculation method. The corresponding result is compared with the results of reliability in the extreme cases(completely dependent and completely independent) by the traditional evaluation method.