摘要
预应力闸墩在运行过程中,锚固洞、锚块下游面、闸墩颈部等关键部位会产生较大的拉应力。当拉应力过大时,会影响预应力闸墩的安全运行。为改善预应力闸墩的受力状态,采用三维有限元法,从主锚索根数、锚索吨位和锚固洞体型三方面进行优化研究。结果表明,主锚索根数的合理选取,在保证安全运行的前提下能减少投资。在最不利工况下,拉锚系数增大能有效降低闸墩颈部拉应力,但锚固洞、锚块下游面最大主拉应力会有所增加。采用流线型锚固洞体型闸墩能有效降低锚固洞拉应力。为增加闸墩的预应力效果,综合考虑,推荐流线型锚固洞体型,主锚索12根布置,拉锚系数1.96,可为实际工程提供参考。
During operating of the prestressed pier,the main parts such as anchorage hole,the downstream surface of the anchor block and the neck of the pier will produce greater tensile stress.The larger tensile stress has impact on the safe operation of the prestressed pier gate.In order to improve the stress state of the prestressed pier,three-dimensional finite element method was used to optimize the number of anchor rope,anchor cable tonnage,and anchor hole shape.The results show that reasonably selecting the number of anchor rope can reduce the investment on the premise of ensuring safe operation.Under the most unfavorable condition,the increase of the anchorage coefficient can effectively reduce the tension stress of the neck of the pier,but will increase the maximum tension stress of the anchorage hole and the lower end of the anchor block.The principal tensile stress of the anchorage hole can be effectively reduced by using the gate pier with streamline anchorage hole shape.In order to increase the prestress effect of the pier,the streamline anchorage hole shape is recommended with 12 main anchor cables and anchor coefficient 1.96,which can provide reference for the actual project.
作者
李浪
李守义
夏可
杨光
杨勇
Ll Lang;LI Shou-yi;XIA Ke;YANG Guang;YANG Yong(College of Water Conservancy and Hydro power, Xi'an University of Technology, Xi'an 710048, China)
出处
《水电能源科学》
北大核心
2019年第7期90-93,共4页
Water Resources and Power
基金
国家自然科学基金项目(51479168)
关键词
预应力闸墩
锚固洞
主锚索
优化
prestressed pier
anchorage hole
main anchor rope
optimization
