【作者】 尚晓峰；

【导师】 周洪彬；

【作者基本信息】 燕山大学 ， 结构工程， 2008， 硕士

【摘要】 平面K型间隙节点是钢管结构中一种最基本的节点形式。然而,在实际工程中K型节点的极限承载力有时不足,限制了钢管结构在工程上的应用。因此对于加强K型节点的研究具有重要的理论及实际意义。本文主要研究弦杆内填充混凝土和在腹杆之间增加插板这两种加强方案对K型圆钢管相贯节点的有效性,给出加强后节点承载力近似计算公式。在正确分析加强K型节点极限承载力的主要影响因素,应用正交设计方法进行试验设计,使用有限元分析软件ANSYS进行数值模拟,求解出节点的极限承载力。而试验是研究钢管节点承载力性能的最重要的方法,也是验证ANSYS数值模拟的最直接的方法。对12个加强K型节点,其中包括6个混凝土加强节点、6个插板加强节点,进行了静力单调加载的试验,得到节点的极限承载力。并将试验、有限元分析及我国规范公式计算结果进行比较,分析了产生偏差的原因。研究分析了节点极限承载力的主要影响因素,并根据试验结果,利用多元线性回归分析,得出加强K型节点极限承载力近似计算公式,为我国钢结构规范有关圆钢管节点承载力计算公式的建立和完善提供了有价值的参考。更多还原

【Abstract】 As one of the most fundamental joint configurations in tubular structures, The ultimate capacity of planer gap tubular K-joints is insufficient sometimes, which limit the project application of steel tube-truss. Therefore the research of reinforced joints has an important theoretical and practical significance. The main goal is to study whether the strengthen method is efficiency to steel circular K-joints, to analysis the design formulae of reinforced circular steel tubular K-joint (RCKJ).The RCKJ experiment is designed by orthogonal design method. And then the specimens can be properly simulated to destroy in ANSYS(FEM soft). Also the ultimate capacity of RCKJ were calculated. However, test is the most important research method of ultimate capacity of tubular joints. It is also the most direct method to confirm the ANSYS simulation test. The number of RCKJ specimen is designed to be twelve with orthogonal design method. The tests on twelve RCKJ, including six reinforced circular steel tubular K-joints with a flashboard and six reinforced circular steel tubular K-joints filled with concrete, is carried out in this dissertation. Then the tests result is compared with results of finite-element analysis and design formula and the difference of them are analyzed.The main influence factors to enhance the ultimate capacity of RCKJ are analyzed in this dissertation. Based on the results, the ultimate capacity formula of RCKJ is summarized by using multiple linear regression analysis.Finally, available references for constituting and consummating of steel tubular design formula are given.更多还原