【作者】 肖启艳；

【导师】 季静；

【作者基本信息】 华南理工大学 ， 结构工程， 2010， 硕士

【摘要】 基于性能的抗震设计方法不仅可以提出承载力要求,还可根据业主需求同时设定预期的变形限值,从而减小结构在地震作用下所造成的损失,使其在整个生命周期内达到性价比最优,是各国制定抗震规范的方向。剪力墙通常是高层建筑的第一道抗震防线,因此在确保生命安全和减小经济损失的前提下将剪力墙设计成具有良好抗震性能的构件显得十分重要。采用基于承载力的抗震设计方法所设计的剪力墙在保证承载力方面有一定的可靠性,但无法预知结构在大震作用甚至中震作用下的真实反应。因此本文对影响剪力墙抗震性能的各因素进行了系统的分析,并基于收集到的试验数据提出以剪跨比、轴压比和弯剪比三个参数划分剪力墙的破坏形态,提出相应的划分标准;采用ABAQUS有限元软件模拟了20片国内外学者所做的RC剪力墙试件,验证了有限元模型和参数的可靠性和可行性,并在此基础上设计了133片矩形截面RC剪力墙进行有限元分析,通过整理分析结果提出小、中、大震下RC剪力墙构件的塑性变形限值。本文的主要内容如下:1.总结了目前国内外学者所做的剪力墙抗震性能试验研究,基于试验结果系统地分析了剪跨比、轴压比、配筋等因素对剪力墙承载力、变形能力和破坏形态等的影响。2.对剪力墙的破坏形态划分方法进行探讨,将收集到的60片剪力墙试验数据进行整理分析,提出以剪跨比、轴压比和弯剪比三个参数来划分RC剪力墙的破坏形态,综合考虑外力作用和剪力墙实际承载力对剪力墙破坏形态的影响,提出相应的划分标准。3.对收集到的20片国内外学者所做的单片悬臂剪力墙试件采用ABAQUS通用有限元软件进行模拟,其中混凝土本构采用混凝土损伤塑性模型,钢筋本构视试验数据采用理想弹塑性模型或二折线模型,将模拟得出的荷载-位移曲线和破坏形态与试验结果进行对比,发现计算结果与试验结果吻合程度较高,表明在选取适当的材料本构及有限元参数的情况下,利用ABAQUS软件对单片悬臂剪力墙进行模拟所得出的结果是可信的。4.在验证了有限元方法准确性和可靠性的基础上,通过变化剪跨比、轴压比、边缘纵向钢筋配筋率和弯剪比四个参数,设计了133片矩形截面RC悬臂剪力墙模型,混凝土本构采用混凝土损伤塑性模型,钢筋本构采用理想弹塑性模型利用ABAQUS进行计算,分析了上述四个参数对RC剪力墙塑性变形能力及破坏形态的影响,提出了不同剪跨比情况下RC剪力墙构件的塑性变形限值,为剪力墙基于性能的抗震设计提供相关参考。更多还原

【Abstract】 Performance-based seismic design method can not only propose the capacity requirement, but also set a desired deformation limit according to the needs of the owner to design the structure, so that can reduce the losses that caused by the earthquake and reach the best performance-price ratio in the whole life of the structure. It is the direction of the developing of the seismic code for various countries. RC shear walls are usually the first seismic fortification line of high-rise buildings, so it is very important to design the RC shear walls to have good seismic performance in the premise of ensuring safety and reducing economic loss. RC shear walls that are designed by capacity-based design method have a certain reliability in ensuring the capacity, but can not predict the real response of the structures under the effect of rare earthquake even design earthquake. In this paper, systemic analysis about the impacts of facts on the seismic performance of RC shear wall is carried out. A classification criterion of RC shear wall failure mode is proposed based on collected experimental data, in the criterion there is contained three parameters that are shear span ratio, axial load ratio and flexure shear ratio. The reliability and feasibility of the FE model and parameters are verified by simulating 20 RC shear wall specimens tested by internal and abroad scholars using ABAQUS finite element software, based on this a set of rectangular RC shear walls are designed to do FE analysis and plastic performance limits of RC shear wall under frequent earthquake, design earthquake and rare earthquake are proposed by arranging the analyzed results. The main contents in this paper are as follows:1. Summarize the RC shear wall seismic performance experimental researches done by internal and abroad scholars, and systemically analysis about the impacts of facts such as shear span ratio, axial load ratio, reinforcing conditions on the capacity, deformability and failure mode of RC shear wall.2. Study the classifications of RC shear wall failure mode. Analysis the collected experimental data of 60 RC shear walls and propose a new RC shear wall failure mode classification criterion which is contained three parameters that are shear span ratio, axial load ratio and flexure shear ratio, the criterion considers the effect of external force and the actual capacity of RC shear wall.3. Simulate 20 single slice cantilevered RC shear wall specimens tested by internal and abroad scholars using ABAQUS finite element software. In the simulation, concrete damage plasticity mode is used for concrete as the constitutive model, and perfect elastic-plastic model or double-slash model is used for reinforcing bar according to corresponding experiments. Comparison of load-deformation curve and failure modes of the specimens between the calculated result and experimental result is done, finding that the calculated result agree well with the experimental result. It is indicated that the calculated result of single slice cantilevered RC shear wall simulated by using ABAQUS is credible when suitable material constitutive models and FE parameters are selected.4. On the basis of the accuracy and feasibility of FE method, the author designs 133 rectangular cantilevered RC shear walls as the shear span ratio, axial load ratio, boundary vertical reinforcement ratio and flexure shear ratio changed, and calculates the 133 RC shear walls by using concrete damage plasticity model for concrete and perfect elastic-plastic model for reinforcing bars. Analysis about the impacts of the four parameters on the plastic deformability and failure mode of RC shear wall are conducted. The plastic deformation limits of RC shear wall components with different shear span ratios are proposed based on the analyzed result, it can provide corresponding reference for performance-based seismic design of RC shear wall.更多还原