摘要
近年来,输电工程中输电线路向高电压、大容量、多回路发展,铁塔承受的荷载持续增加,塔腿在大荷载作用下对塔脚板强度要求也一再提高,于是,四地脚螺栓塔座板已不能满足现有工程的需要,八地脚螺栓塔座板则得到更广泛的关注和应用。然而,现行设计规范对八地脚螺栓塔脚板承载力的计算公式不甚完备,滞后于实际工程需要。鉴于此,文章对八地脚螺栓塔座板抗拉承载力进行了试验和设计理论研究。首先,选取14组试验样本进行塔座板静力加载试验,试验中观测塔座板的应力状态和破坏模式,并探讨底板厚度、螺栓孔位置等因素对八地脚螺栓塔座板抗拉承载力的影响;然后,在抗拉试验基础上,提出基于屈服线法理论并充分考虑底板厚度和螺栓孔位置的塔座板抗拉承载力计算公式,并借助"塑性分析,弹性设计"的思想考虑一定的安全储备,最后,将文章所提设计公式与规范和试验结果进行比较,结果表明,文章所提的八地脚螺栓塔座板建议公式与试验结果更加吻合,具有较好的经济适用性,可为现行设计规范的设计理论提供必要参考。
In recent years,transmission lines in power transmission projects have been developed towards high voltage,large capacity and multiloop.The load on the tower continues to increase,resulting in the higher strength requirement on the tower base plate.As a result,the tower base plate with four bolts can no longer meet the needs of the existing projects,while the tower base plate with eight bolts has received wider attention and more applications.However,calculation formulas in current design specifications for the bearing capacity of the tower base plate with eight bolts are incomplete,and fall behind the actual engineering requirements.In view of the situation,tests and design theoretical research on the tensile capacity of the tower base plate with eight bolts were carried out in this work.First,14 groups of samples were selected for the static loading tests.In the tests,the stress states and failure modes of the tower base plate were observed,and the influences of the base-plate thickness and the bolt locations on the tensile capacity of tower base plate with eight bolts were discussed.Next,based on the tensile test and the yield line theory,the formulas of calculating the tensile capacity of the tower base plate were proposed considering the base-plate thickness and the bolt locations.In virtue of the idea of"plastic analysis and elastic design",a certain safety reserve shall also be considered in the proposed formulas.Finally,the design formulas are compared with the current design specifications and test results.The results show that the results from the proposed design formulas for calculating the tensile capacity of the base plate with eight bolts agree well with the test results,indicating that the proposed formulas have good economic applicability,which may be referred by the design theory in the current specifications.
作者
刘俊卿
袁红丽
文凡
王学明
薛晓敏
Liu Junqing;Yuan Hongli;Wen Fan;Wang Xueming;Xue Xiaomin(Xi'an University Of Architecture And Technology,Xi'an 710055,China;Northwest Electric Power Design Institute of China Power Engineering Consulting Group,Xi'an 710075,China;Xi'an Jiaotong University,Xi'an 710049,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2019年第7期48-56,共9页
China Civil Engineering Journal
基金
西北电力设计院有限公司科技项目(XB1-TM04-2017)
国家自然科学基金(11502188)
关键词
输电塔塔座板
八地脚螺栓
静力试验
屈服线法
承载力
Transmission tower base plate
base plate with eight bolts
static loadings test
the yield line method
the bearing capacity
