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混凝土灌芯速成墙板结构体系弹塑性分析
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摘要
速成墙板作为一种新型的建筑材料具有许多优点,在澳大利亚等非地震区应用广泛,在地震区的应用还需要进一步研究,尤其在设计、施工、理论分析方面还有许多工作要做。本文以速成墙板的试验研究为基础,借鉴以往剪力墙宏观模型的研究成果,建立了混凝土灌芯速成墙板(简称复合墙板)的宏观计算模型,并在此基础上进行了简化,形成四垂直杆元计算模型,并将其应用于复合墙板结构体系中,对结构体系进行了静力弹塑性分析,本文的主要工作如下:
     利用多垂直杆元模型建立了复合墙板的力学计算模型。给出了垂直杆单元和剪切单元荷载位移骨架曲线的计算方法及滞回规则。在计算复合墙板的剪切刚度时,通过折减系数考虑了纤维石膏和混凝土之间的粘结滑移作用,通过轴压比,考虑了轴向荷载对抗剪刚度的影响,以细观力学矩形模型为基础,采用等应变假设推导了等效剪切刚度。利用该模型对满灌复合墙板和隔孔灌复合墙板试验进行了静力弹塑性Pushover分析和动力弹塑性分析,计算曲线和试验曲线比较一致,表明该模型不仅力学概念清晰,计算简单,而且具有较好的计算精度,便于在整体结构的计算中使用。
     利用简化的四垂直杆元模型,对一幢六层住宅进行了模态分析,计算出的周期、振型与实测值吻合较好,验证了该计算模型的准确性和有效性;同时,还利用该模型对住宅进行了静力弹塑性Pushover分析,计算出结构在多遇地震、罕遇地震情况下的性能点,证明该结构的层间位移角既能满足弹性极限的要求,也能满足弹塑性极限的要求,可以利用该模型校核实际工程设计的可靠性。
Rapid wall is new building material and has many advantages. It is widely usedto non-earthquake zone such as Australia, many researches remains yet to be done,especially in design, construction and theory. Based on tests on concrete-filled rapidwall (composite wall panels) and macro models on Shear Wall, macro model forcomposite wall panels are provided in this paper. With the Simplifiedfour-vertical-line-element model based on macro model for composite wall panels,static-elastic-plastic analysis is done for a structure out of composite wall panels. Themain work is as follow:
     The analytical model for composite wall panels is established by using themulti-vertical-line-element model,then the method for calculating theforce-displacement skeleton curves of multi-vertical-line-element, shear element andhysteretic rule is proposed. When calculating shear stiffness, Bond-slip characteristicin the concrete and the glass fiber reinforced gypsum is scaled by discountcoefficient,influence of axial load on shear stiffness is calculated in virtue of ratio ofaxial load to compressive strength. With the model of micro-mechanics rectangle,equivalent shear stiffness is deduced on the assumption that equivalent strain. Theconcrete filled panels and the partial concrete filled panels test data is analyzed bymaking use of this model. The calculated curves agree well with the experimentalones. It proves that this model has the advantages of clear mechanical conception,simple calculation and relatively good accuracy,it is convenient for calculatingintegral structure.
     With the Simplified four-vertical-line-element model, modal analysis is done fora six-storied house. The calculated periods and modes of vibration agree well withtested ones, it proves the accuracy and validity of the proposed analytical model andthe calculating method. At the same time, pushover analysis is carried out, thecalculated performance points under frequent earthquake and very rare earthquakeproved the story drift ratio can meet the elastic limit requirement and theelastic-plastic limit requirement, the proposed analytical model can verify reliabilityof an actual building design.
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