RC斜撑框架论文：采用RC斜撑框架加固中小学砌体结构抗震性能的研究.docVIP

RC斜撑框架论文：采用RC斜撑框架加固中小学砌体结构抗震性能研究 【中文摘要】5.12汶川地震后,造成了大量中小学砌体结构校舍的倒塌破坏。因此,对中小学砌体结构进行抗震加固来最大程度地减少未来可能的地震作用造成的生命和财产损失,已经成为当前政府工作的重要议题。论文针对按规范设计和施工的带悬挑走廊的三层中小学砌体结构的结构特点,提出了采用RC斜撑框架加固的抗震加固方法。采用ABAQUS有限元软件作为研究手段,进行了以下研究:(1)进行了8个三层横向单榀砌体结构在低周往复循环加载条件下的非线性静力分析,从滞回曲线、骨架曲线、等效粘滞阻尼系数和拉裂损伤变化情况等进行了对比,证明该加固方法的可行性。(2)进行了6个纵向三层单榀砌体结构在低周往复循环加载条件下的非线性静力分析,从滞回曲线、骨架曲线、等效粘滞阻尼系数、强度退化和拉裂损伤应变情况等进行对比分析,进一步研究两种不同材料间的协同工作机理及抗震加固效果。(3)进行了加固前后2个模型砌体结构分别在Lanzhou波和Taft波罕遇地震作用下的弹塑性时程分析。重点分析了纵横向楼层位移时程曲线、基底剪力时程曲线和拉裂损伤应变情况。主要研究结论如下:(1)ABAQUS通用有限元软件能够较好地模拟砌体结构的非线性分析;(2)加固后,RC斜撑框架与原砌体之间能够形成良好的协同工作,可以发挥其新增构件的高刚度高承载力的优势,从而提高结构的整体承载能力;(3)RC斜撑框架对砌体墙起到了一定的约束作用,提高了原结构的抗侧刚度,使得结构的侧向位移沿楼层高度变化较为均匀;(4)加固后,结构的屈强比有所增大,有效屈服段变短,反而不利于结构实现“大震不倒”的目标。此外,RC斜撑框架加固方法不但对原结构采光通风影响小,而且不减少走廊重要逃生通道的尺寸,可以在后续中小学砌体结构的加固工程中推广应用,对新建结构的抗震设计也具有一定的借鉴意义。 【英文摘要】Middle and primary school masonry structure were collapsed or damaged seriously. Therefore, strengthening the existing masonry school buildings, thereby reducing losses of life and property to a minimum in case of an earthquake, has become one of the most important issues on the agenda of the government.In this study, a new strengthening method namely additional RC braced frame is mentioned for a typical middle and primary masonry building with cantilever corridor, which have been built commonly on the rule of the former seismic specifications. Based on the ABAQUS general finite element analysis, some researches have been committed as follows.(1)8 specimens of transverse three-story one-bay masonry structure under low cyclic loading are raised to prove the capability of method, by comparisons of Hysteretic curves of the specimens, Skeleton curves of the specimens, Equivalent viscous damping ratios and Tensile damage variables.(2)6 specimens of longitudinal three-story one-bay masonry building under the low cyclic loading are conducted to further improve that the two materials can cooperate together well and improve its seismic behaviour, by the comparisons of Hysteretic curves of the