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(1 南京工業(yè)大學(xué)土木工程學(xué)院， 南京 211800； 2 浙江省電力設(shè)計院， 杭州 310012)
［摘要］特大型鋼管結(jié)構(gòu)（如大跨越輸電鐵塔等）主材內(nèi)力及直徑均非常大，鋼管接長后采用傳統(tǒng)剛性法蘭連接不能滿足承載力要求且不經(jīng)濟(jì)。在鋼管內(nèi)外側(cè)均設(shè)置連接螺栓，形成鋼管內(nèi)外法蘭。并針對鋼管填充混凝土與否，設(shè)計并制作鋼管內(nèi)外法蘭及鋼管混凝土內(nèi)外法蘭試件，開展2種內(nèi)外法蘭抗彎承載力性能試驗、有限元模擬分析和抗彎旋轉(zhuǎn)軸計算理論研究，考察其承載力特性、傳力機(jī)理及旋轉(zhuǎn)軸位置。分析加載過程中連接螺栓、鋼管及混凝土應(yīng)變的發(fā)展情況，得到法蘭嚙合面旋轉(zhuǎn)軸位置及內(nèi)外螺栓內(nèi)力分布規(guī)律。研究表明，鋼管混凝土內(nèi)外法蘭受彎時可以避免鋼管發(fā)生局部屈曲，提高了法蘭節(jié)點整體抗彎剛度； 且隨著荷載的增大，法蘭板張開，混凝土開裂，螺栓發(fā)生頸縮破壞。鋼管內(nèi)外法蘭及鋼管混凝土內(nèi)外法蘭抗彎承載力設(shè)計時，連接螺栓旋轉(zhuǎn)軸位置分別可取距離管中心0.6R，0.8R(R為鋼管半徑)。
［關(guān)鍵詞］鋼管混凝土結(jié)構(gòu)； 內(nèi)外法蘭； 抗彎承載力； 旋轉(zhuǎn)軸； 連接螺栓； 法蘭連接
中圖分類號：TU392-3， TU317-1文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2021)02-0071-07
Study on the influence of concrete filled steel tube on the flexural bearing capacity of inner and outer flange joints
CHEN Qian1, ZHANG Kaixuan1, GUO Yong2, ZHANG Dachang1
(1 College of Civil Engineering, Nanjing Tech University, Nanjing 211800, China；2 Electric Power Design Institute of Zhejiang Province, Hangzhou 310012, China)
Abstract:The internal force and diameter of the main material of extra-large steel tube structures(such as large-span transmission tower, et al.) are very large. When the steel tube is lengthened, the traditional rigid flange connection can not meet the requirement of bearing capacity and is not economical. Connecting bolts were set on the inner and outer sides of the steel tube to form the inner and outer flanges of the steel tube. According to whether the steel tube was filled with concrete or not, the inner and outer flanges of steel tube and the inner and outer flanges of concrete filled steel tube were designed and manufactured. Carry out two types of inner and outer flange anti-bending bearing capacity performance test, finite element simulation analysis and theoretical research on bending rotating shaft calculation to investigate its bearing capacity characteristics, force transmission mechanism and rotating shaft position. The development of the strain of connecting bolt, steel tube and concrete in the process of loading was analyzed, and the position of the rotating shaft of the flange connection interface and the internal force distribution of the internal and external bolts were obtained. The results show that the inner and outer flanges of concrete filled steel tube avoids the local buckling of the steel tube when the flange is bent, and improves the overall bending rigidity of the flange joint. And with the increase of load, the flange plate is opened, the concrete cracks, and the bolt is necked damaged. When designing anti-bending bearing capacity of the inner and outer flanges of steel tube and the inner and outer flanges of concrete filled steel tube, the rotating shaft of bolt is suggested be 0.6R and 0.8R (R is the radius of the tube) distant from the centerline of the tube.
Keywords:concrete-filled steel tube structure; inner and outer flange; anti-bending bearing capacity; rotational axis; connecting bolt; flange connection
*浙江舟山500千伏聯(lián)網(wǎng)輸變電工程大跨越研究專題項目(ZT2016-05)。
作者簡介：陳前，碩士，Email：44794951@qq.com； 通信作者：張大長，博士，教授，Email：dczhangchina@163.com。
