共查询到20条相似文献,搜索用时 968 毫秒
1.
2.
3.
4.
5.
6.
7.
文章综述了对海洋水下桁架结构的性能要求及为满足这些要求如何选择钢材和焊接材料,如何进行焊接接头设计和焊接施工等技术内容。文内还对490.3~784.5MPa级的高强度钢用于这种结构时的一些焊接问题及解决措施作了介绍。 相似文献
8.
基于性能的抗震设计理论,提出了面向海洋平台结构的地震设防水准和性能目标,并阐述了平台结构失效模式及量化判别依据。针对胜利油田CB32A导管架平台的特点,在端帽与平台甲板之间设置阻尼隔震层,利用ANSYS有限元数值分析平台,对该导管架式海洋平台的阻尼隔震体系在设计地震及罕遇地震两种作用下的实际抗震性能水平进行分析,并对目标性能达标情况进行评估和结构优化。研究结果表明,隔震技术是海洋平台一种有效的减振控制手段,该平台能够满足结构的性能目标;对其进行截面优化设计也能在保证结构安全的前提下大幅度减少钢材的用量。 相似文献
9.
10.
本文介绍了苏联哈里科夫建工学院最近提出的几种钢筋混凝土结构节约钢材的方法,并且结合我国国情进行了探讨。指出:冷拉Ⅲ级钢筋作为钢筋混凝土梁的配筋,其强度可以得到充分利用,因此减少了钢材用量;采用钢-玻璃钢复合配筋的混凝土结构,可以提高结构的强度、刚度、抗裂性和耐久性并减少钢材的用量;用玻璃钢代替钢筋混凝土结构中的钢筋,是今后节约钢材的重要方向。 相似文献
11.
12.
13.
缺陷和损伤对导管架式海洋平台结构极限承载力的影响 总被引:8,自引:0,他引:8
首先讨论海洋平台结构缺陷和损伤的特点及在平台结构极限承载力分析中的考虑方法;其次根据平台结构完好和有损状态的极限承载力,定义了平台结构的储备强度和剩余强度;最后,采用导管架式海洋平台结构极限承载力近似分析程序UAP,分析了裂纹类缺陷、凹痕类缺陷、腐蚀、海生物附着、地基土冲刷等对导管架式海洋平台结构极限承载力和安全性的影响,从而为海洋平台结构的维修决策提供了依据。 相似文献
14.
15.
In this paper, the seismic response of a newly designed steel jacket offshore platform with a float over deck (FOD) system in the Persian Gulf was investigated through incremental dynamic analysis. Comparison of incremental dynamic analysis results for both directions of the platform shows that the lateral strength of the platform in the float over direction is less than its lateral strength in other direction. Dynamic characteristics measurement of a scale model of platform was also performed using forced vibration tests. From experimental measurement of the scaled model, it was observed that dynamic characteristic of the platform is different in the float over direction compared to the other direction. Therefore, a new offshore installed bracing system for the float over direction was proposed for improvement of seismic performance of this type of platform. Finally, the structure with the modified system was assessed using the probabilistic seismic assessment method as well as experimental measurement of its dynamic characteristics. It was observed that the proposed offshore installed bracing system improves the performance of platforms subjected to strong ground motion. 相似文献
16.
17.
18.
19.