【作者】 朱磊；

【导师】 查晓雄；

【作者基本信息】 哈尔滨工业大学 ， 结构工程， 2008， 硕士

【摘要】 在实际工程中,空心钢管混凝土结构的应用越来越广泛。在空心钢管混凝土结构的设计中需要知道柱的线刚度进而求出抗侧移刚度;需要知道梁的线刚度和柱的线刚度,从而利用D值法计算结构在水平荷载下的响应;在空心钢管混凝土构件承载力校合方面需要知道刚度以确定最大应力。然而空心钢管混凝土作为一种组合结构会在使用过程中由于相互作用而产生套箍作用,混凝土会由于受拉而开裂,从而使得其整体刚度不再是二者的简单叠加,本文先分析其受力后的工作机理,考虑材料的非线性及二者实际的工作状态,从理论上得到整体的轴压刚度,受弯刚度,然后利用大型有限元软件ABAQUS对构件进行模拟计算,利用模拟结果验证理论刚度公式并修正之。空心钢管混凝土柱作为结构的重要承载部位,其受火后的承载力变化十分明显,对结构整体的抗火性能有着非常重要的制约作用,因此研究空心钢管混凝土柱受火后的承载力非常重要。本文考虑材料力学性能的非线性,材料热工性能随温度而变化的特性,二者的套箍效应等因素,利用有限元软件ABAQUS模拟四周均匀受火的空心钢管混凝土的轴压承载力,得到其与常温下承载力的比值系数表格,为工程实际抗火提供依据。更多还原

【Abstract】 In real engineering field, the use of hollow concrete filled steel tubular has became very widely. The study of its behavior becomes very important, in order to design HCFST structure, we have to know the column’linear stiffness, we need to know the girder’flexual stiffness, so we may use“D method”to calculate the effects when the structure suffered the horizontal load; in order to verify the bearing capacity of HCFST, we had to know the stiffness to calculate the maximal stress. But the HCFST is one kind of combined structure, in the use stage it will produce TaoGu effect, and the concrete will crack when it is under pulling strength, so the stiffness has no long directly from the plus of each part. In the text, first analysis the mechanism after inflict load to it, take into account the nonlinear of material and each working state, get the theoretic formula, then use ABAQUS to simulate lots of members to identify the theoretic formula and revise it.Hollow concrete filled steel tubular column as an important support, the bearing capacity of it when suffering fire has changed a lot, it will greatly restrict the structure’fire resistance, so it is very important to study the bearing capacity of the column when suffering fire. In the text, considering the nonlinear behaviors of the material, the heat behaviors of the material, the Tao Gu effect of the column, by the usage of the ABAQUS to simulate the member under the uniform ISo-834 around it to get the load bearing capacity, in the end to get the ratio coefficient between the bearing capacity under normal temperature and fire.更多还原