【作者】 赵宇；

【导师】 杜新喜；

【作者基本信息】 武汉大学 ， 结构工程， 2018， 硕士

【摘要】 不锈钢材料具有优良的耐腐蚀性和耐久性,可以从根本上解决普通钢结构的锈蚀问题,延长结构的设计使用年限,降低后期维护成本,在建筑工程领域具有可观的应用前景。在不锈钢结构中连接节点占有重要的地位,其性能直接影响结构的安全性,因此对作为主要连接方式之一的不锈钢板螺栓抗剪连接的研究显得尤为重要。不锈钢材作为典型的非线性金属结构材料,在力学性能上与普通结构钢材存在较大差异,因此不锈钢板件螺栓连接节点必然呈现出与普通钢板螺栓连接节点不同的受力性能,需要开展专门针对不锈钢结构的研究,得到考虑不锈钢材料非线性特性的计算方法。本文通过试验结果,结合数值算例对不锈钢板螺栓连接承载性能进行研究,并提出了承压承载力的建议计算公式。本文的研究工作主要包括以下三个方面:(1)对建筑工程中常用两种不锈钢板和一种不锈钢螺栓开展材料力学性能试验,得到不锈钢板和不锈钢螺栓的材料力学性能指标以及应力-应变关系曲线。同时完成了 54组奥氏体型S30408和双相型S22253不锈钢板螺栓抗剪连接试件的单调加载试验,得到了各组试件的破坏形态、荷载-位移曲线、荷载-孔径变形曲线以及由变形准则得到的承载性能指标。(2)使用有限元分析软件ABAQUS来建立精细的不锈钢板螺栓抗剪连接试件的三维实体模型,对本文中的54组不锈钢板螺栓抗剪连接试件以及其他文献中的10组不锈钢板螺栓抗剪连接试件的加载过程进行模拟,将有限元结果与试验结果进行了对比分析,对所建立的有限元分析模型的准确性和适用性进行了充分的验证。(3)对影响不锈钢板螺栓抗剪连接承载性能的影响因素开展了参数分析,探究各影响因素对螺栓连接承载性能定性和定量的影响规律,并计算得到了 294个数值算例,基于试验与有限元分析结果,提出了不锈钢板螺栓抗剪连接承压承载力建议计算公式。更多还原

【Abstract】 Stainless steels become appealing choices for structural materials in civil engineering applications due to their excellent corrosion resistance and durability,which can offer a fundamental solution to the corrosion problem for carbon steel structures and extend design service life with reduced maintenance cost.The connections play an important vote in stainless steel structures,which can affect the overall structure safety.Therefore,it is of great importance to investigate the load-carrying behavior of stainless steel bolted shear connections,which is the focus of this thesis.In view of the typical non-linear material properties of stainless steels,which differ from ordinary carbon steels,the bolted shear connections with stainless steel plates exhibit different load-carrying behavior.Hence,studies on stainless steel bolted shear connections are required.Experimental and numerical studies on the load-carrying behavior of bolted shear connections with stainless steel plates were carried out,with a new design formula for bearing capacity presented.The following three sections were included in this dissertation,(1)Tensile coupon tests on the two types of stainless steel plates and one type of stainless steel bolt were carried out,and the material properties and the full stress versus strain curves were obtained.Moreover,static shear loading tests for a total of 54 stainless steel bolted shear connections were carried out,and the failure modes,load versus displacement curves,the load versus hole deformation curves and the bearing capacities acquired by the deformation criteria of specimens were obtained.(2)Finite element(FE)models,developed by means of ABAQUS software package,were utilized to simulate the load-carrying behavior of the test specimens,which were further validated against the obtained test results.(3)Based upon the validated FE models,parametric studies were carried out to assess the influences of the key input parameters on the load-carrying behavior.Numerical simulations on a total of 294 bolted shear connections were performed.Based on the obtained test and numerical results,a new design formula for predicting bearing capacity of bolted shear connections with stainless steel plates has been presented.更多还原