- 摘 要
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（1 沈陽建筑大學土木工程學院， 沈陽 110168； 2 中國建筑科學研究院有限公司， 北京 100013）
［摘要］預埋吊件在使用過程中，邊距效應是影響其抗拉承載力的主要因素。采用有限元分析與試驗研究相結合的方法，研究邊距對擴底型預埋吊件抗拉承載力的影響。整理國內規(guī)范《混凝土結構后錨固技術規(guī)程》（JGJ 145—2013）、美國規(guī)范ACI 318-05、英國規(guī)范CEN/TR 15728中預埋吊件受拉破壞模式及抗拉承載力計算公式，比較其異同。建立三組試驗，預埋吊件邊距100mm，埋深分別為70，85，90mm。建立三個與試驗對應的有限元模型，通過試驗結果與模擬結果的對比，證明有限元模型可以用來研究邊距對預埋吊件抗拉承載力的影響。在此基礎之上建立混凝土強度為C20，C30，C40以及預埋吊件埋深為90mm的三組模型，每組6個模型，模型邊距為100，110，120，130，140，150mm。有限元分析結果表明擴底型預埋吊件受拉時均發(fā)生混凝土錐體破壞，錐角約40°。預埋吊件抗拉承載力與英國規(guī)范CEN/TR 15728的計算值最為接近，且隨邊距增大而增大。
［關鍵詞］擴底型預埋吊件；邊距；混凝土錐體破壞；抗拉承載力；有限元分析
中圖分類號：TU375文獻標識碼：A文章編號：1002-848X(2021)05-0133-08
Study on the effect of edge distance on anti\|pull bearing capacity of bottom-enlarged lifting anchor
MENG Xianhong1, LI Guangyu1, LIU Wei1, SUN Zhen1, GUO Kai1, GAO Di2
（1 School of Civil Engineering， Shenyang Jianzhu University， Shenyang 110168， China；2 China Academy of Building Research， Beijing 100013， China）
Abstract:In the process of using the lifting anchor, the effect of edge distance is the main factor on the influence of the anti-pull bearing capacity. The combination method of finite element analysis and experimental research was used to study the effect of edge distance on the anti-pull bearing capacity of the bottom-enlarged lifting anchor. The tensile failure modes and the corresponding anti-pull bearing capacity calculation formulas of lifting anchor were sorted out in the Chinese standard After anchoring technical regulations for concrete structures（JGJ 145—2013）, American standard ACI 318-05, and British standard CEN/TR 15728 to compare their similarities and differences. Three test groups were established, the edge distance of the lifting anchor is 100mm, and the embedded depths are 70, 85, 90mm respectively. Three finite element models corresponding to the experiment were established, and the comparison of the test results with the simulation results proves that the finite element model can be used to study the influence of edge distance on the anti-pull bearing capacity of lifting anchor. On this basis, three groups of models with concrete strengths taken as C20, C30, C40 and embedded depth of the lifting anchor as 90mm were established. Each group has 6 models, with 100, 110, 120, 130, 140, 150mm in edge distance respectively. The results of finite element analysis show that the concrete-cone breakage occurs when the bottom-enlarged lifting anchor is tensioned, and the cone angle is about 40 degrees. The anti-pull carrying capacity of the lifting anchor is closest to the calculated value of British standard CEN/TR 15728, and it increases with the increase of the edge distance.
Keywords:bottom-enlarged lifting anchor; edge distance; concrete-cone breakage; anti-pull bearing capacity; finite element analysis
*“十三五”國家重點研發(fā)計劃資助（2016YFC0701700）。
作者簡介：孟憲宏，博士，教授，Email:sjzuxianhong_meng@foxmail.com。
