【作者】 张鹏；

【导师】 孙跃东；

【作者基本信息】 山东科技大学 ， 岩土工程， 2005， 硕士

【摘要】 本文在总结国内外钢筋混凝土框架结构抗震性能研究的基础上,进行了四个1/2缩尺比例框架试件的低周反复加载试验。混凝土设计强度等级为C30,再生骨料掺量分别为0%、30%、50%、100%。试验表明再生混凝土框架结构的各特征荷载均略低于普通混凝土框架,但是也表现出较为良好的延性性能和耗能能力,能满足工程抗震设计的要求。 在总结前人钢筋混凝土非线性有限元分析理论的基础上,借助于大型有限元分析程序ANSYS,对低周反复荷载作用下各榀混凝土框架试件的受力过程进行计算机仿真模拟。在模拟过程中,钢材采用Von—Mises屈服条件和等向强化本构关系,混凝土采用William—Warnke五参数破坏准则和弹塑性本构关系,分别建立钢筋混凝土分离式和整体式两种三维实体模型,分析了框架在单调和低周反复荷载作用下的受力性能,较为精确的分析了框架各部分的应力分布,以弥补试验中无法直观了解各细部受力情况和改变各种参数进行对比的缺陷,考察了再生骨料掺量对框架受力性能的影响,并通过理论分析和试验结果的比较,探讨了用已有的钢筋混凝土非线性有限元理论和ANSYS程序对再生混凝土框架结构进行抗震性能分析的可行性和可信度,为进一步的再生混凝士框架抗震性能研究奠定基础。 理论分析和试验结果的比较表明:用已有的钢筋混凝土非线性有限元理论和ANSYS程序对再生混凝土框架结构进行受力分析是可行的,理论计算可以得到与实际试验相吻合的结果,可以作为工程设计的依据。更多还原

【Abstract】 On the basis of study on seismic behaviors of recycled concrete frame and practical engineering, we have performed a group of trials on four reinforce concrete frames under low reversed cyclic lateral loading in this paper. The designed strength grade of concrete used in trials is C30, and the replacement ratio of recycled aggregate is 0%, 30%, 50% and 100% separately. The result of trials reveals that characteristic loading of recycled concrete frames are slightly lower than that of normal concrete frame, which can influence seismic behavior of frame little, however, recycled concrete frames have performed good ductility and energy dissipation that can satisfy the request of seismic design of engineering.Computer simulations on all reinforced concrete frames under low reversed cyclic lateral loading have been performed via ANSYS—a great finite element analysis program—on the basis of non-linear finite element analysis theory on recycled concrete. In the procession of the simulation, Von-Mises yield criterion and bilinear isotropic hardening stress-strain relationship have been used for steel bar, synchronously the William-Warnke failure criterion and elastic-plastic stress-strain relationship have been used for concrete. Two kind of finite element model (separate and integer for concrete and bar ) have been established to simulate the behaviors of frame under low reversed cyclic lateral loading and monotonic loading separately. The results of nonlinear finite element analysis can show the stress distribution in all parts of frame, moreover it provides the possibility to patch up the defects that details can’t be observed in experiments visually. And then influences on frame behaviors of various factors such as recycled aggregate replacement ratio and axial compression force ratio can be analyzed. The feasibility and reliability of applying existing nonlinear finite element analysis method and ANSYS for the analysis of seismic behavior of recycled concrete frame can be verified through the comparison between theoretical analyses and trial results, which will provide basis for further study on seismic behavior of recycled concrete frame. The fact is that theoretical analyses are consistent with trial results, therefore the results of theoretical analysescan be used for the basis of engineering design.更多还原