【作者】 张颖；

【导师】 何嘉年； 陈士哲；

【作者基本信息】 广东工业大学 ， 建筑与土木工程（专业学位）， 2021， 硕士

【摘要】 组件法是研究钢结构节点的重要方法,然而由于各个组件力学性能和组件间的相关关系不明确,目前的分析结果还无法应用于实际工程中。T型件是组件法中一个重要组件,理清T型件的受力过程对节点的力学性能分析有重要意义。几十年来,国内外学者对T型件进行了大量的试验与数值分析,对T型件撬力和弯矩进行深入的探讨,并建立了T型件的力学模型。然而对于节点或T型件的螺栓内力的研究往往集中在无加劲肋的情况下,带加劲肋节点或T型件的螺栓内力分布情况研究相对有限,本文以带加劲肋的T型件为基础力学模型,通过试验与数值分析的方法,对该模型力学性能进行深入分析。具体如下:(1)本文对9个不同构造的T型连接件进行了单调拉伸试验,分析了T型连接件的破坏过程、破坏模态,研究了T型件翼缘厚度、加劲肋、螺栓直径和间距对T型件初始刚度、极限承载力和螺栓应力的影响。试验表明,T型件的破坏模式主要为翼缘屈服、螺栓破坏,其中翼缘厚度、螺栓直径与加劲肋对T型件力学性能影响较大,增大翼缘厚度、螺栓直径或者布置加劲肋可以提高T型件刚度和承载力。布置加劲肋后,同一荷载下,螺栓轴向应力和弯曲应力相对无加劲肋T型件较小,同时弯曲应力所占比例较低。(2)利用ABAQUS扩大参数分析,建立6组有限元模型,总结了无加劲肋情况下和带加劲肋情况下T型件在不同参数下的螺栓轴力、撬力和弯矩发展发展规律。有限元结果表明:与无加劲肋T型件相比,带加劲肋T型件的螺栓内力主要受翼缘厚度、螺栓横向距离比和纵向距离比影响。相同荷载下,翼缘厚度、横向距离比和纵向距离比越大,螺栓轴力、弯矩、撬力越小;布置加劲肋后,撬力和螺栓弯矩有所降低,但螺栓弯矩仍不可忽视,设计中应考虑螺栓弯矩对螺栓承载力的影响。(3)基于试验与有限元分析结果,本文在无肋T型件的撬力和弯矩计算公式基础上,提出了带肋T型件的撬力计算模型和修正了带肋T型件的弯矩计算公式,并验证本文公式的可靠性。算例表明,该公式计算结果与有限元结果吻合良好,对T型件安全设计有参考意义。更多还原

【Abstract】 Component method is very important method to the moment-rotational relationship of the steel joints.However,due to the unclear mechanical properties and correlation of the mechanical components,the current analysis results can not be applied to practical engineering directly.T-stub is an important component in the applying of component method.It is of great significance to clarify the mechanismof T-stub for the analysis of mechanical properties of steel joints.For decades,a large number of experiments and numerical analysis on T-stub have been carried out by many researchers,the prying force and bending moment of T-stub were deeply discussed,and mechanical model of T-stub was established.However previous studies mainly focused on the internal force of the bolt without stiffener,internal force distribution research of stiffened T-stub are relatively limited.In this paper,the mechanical properties of stiffened T-stub are analyzed deeply by means of experiment and numerical analysis.The specific work is as follows:(1)In this paper,monotonic tensile tests were conducted with 9 specimens,the loading process and failure modes of T-stub were analyzed.The influences of flange thickness,bolt spacing,bolt diameter and stiffener rib on initial stiffness,ultimate bearing capacity and bolt stress of T-connector were studied.The test results show that the failure modes of T-stubs are flange yield and bolt failure.Flange thickness,bolt diameter and stiffener have a great influence on the mechanical properties of T-stub.Increasing flange thickness,bolt diameter or arranging stiffeners can improve the stiffness and bearing capacity of T-stub After the stiffener is arranged,the axial stress and bending stress of bolts are smaller than T-stub without stiffeners,and the proportion of bending stress is lower under the same load case.(2)ABAQUS was used to conduct the parameter analysis,six groups of finite element models were established.The influences of different parameters on the development process of bolt axial force,prying force and bending moment were studied respectively.The finite element results show that compared with T-stub without stiffening ribs,the internal force of the bolts of T-stub with stiffening ribs is mainly affected by the thickness of the flange,the ratio of bolt lateral distance and longitudinal distance.The increase of the thickness of the flange,the ratio of bolt lateral distance and longitudinal distance can reduce the bolt axial force,bending moment and prying force.With the arrangement of stiffeners,the prying force and the bolt bending moment are greatly reduced,but the bolt bending moment can not be ignored.The influence of bolt bending moment on the bearing capacity of bolts should be considered in the practical design.(3)Based on calculation formula of unstiffened T-stub considering prying force and bending moment,the calculation model of the prying force of the ribbed T-stub is proposed and the calculation formula of the bending moment of the ribbed T-stub is revised,and the reliability of the equation is verified.The numerical example shows that the calculated results of the eauation are in good agreement with the finite element results,which has important reference valueto the safety design of T-stub.更多还原