[笔记][算例] “剪切型”与”弯曲型”位移曲线的位移角特性

坚持实干、坚持积累、坚持思考,坚持创新。 如题,直接做两个简单算例测算并可看出效果。左边是一个框架结构,代表剪切型位移曲线,右边是一个框筒结构,把筒做得强点,框架搞弱点,代表弯曲型位移曲线​,实际还是有点弯剪型特性,不过不影响分析。 测算模型 风楼层剪力 风楼层位移曲线 风楼层位移角曲线 地震作用下情况也类似 地震剪力曲线 地震位移曲线 地震位移角曲线 从以上对比可知,对于位移曲线为“剪切型”的框架结构,最大位移角集中楼层底部,楼层越高位移角越小,因为楼层越高,侧向力越小,而对于位移曲线为“弯曲型”的剪力墙结构,楼层越高,位移角可能越大,主要原因是楼层越高,因下一层弯曲转角引起的无害位移角越大,实际有害位移角并不是越来越大。由此也可以判断,对于位移曲线为“弯剪型”的结构,位移角最大值可能会出现在中部。而对于实际复杂项目,位移角曲线形状就有很多种可能了。​ 微信公众号 ( Wechat Subscription) 欢迎关注 “结构之旅” 微信公众号

[结构][FEM][Midas Gen] 结构的弯曲变形和剪切变形分量——简单算例 (Bending induced and Shear induced Lateral Deformation of Structure)

坚持实干、坚持一线、坚持积累、坚持思考,坚持创新。 几个简单算例,测算的侧移,其中有多少是弯曲变形引起,多少是剪切变形引起。 接下来有空再找几个实际工程算例测算,看看方法是否合理。 微信公众号 ( Wechat Subscription) 欢迎关注 “结构之旅” 微信公众号

[结构][软件] 墙体稳定验算 (Stability Calculation of Walls)

坚持实干、坚持一线、坚持积累、坚持思考,坚持创新。 随后更新……           微信公众号 ( Wechat Subscription) 欢迎关注 “结构之旅” 微信公众号Set featured image

[Abaqus][大震][弹塑性] Abaqus分层壳分布钢筋角度对剪力墙受力性能的影响

坚持实干、实践、积累、思考,创新。 实际项目的对比研究分析。 剪力墙分布筋设置不同角度进行大震弹塑性时程分析。 结果显示,分布筋按45度135度方式设置,可一定程度提高剪力墙的抗剪性能,改善剪力墙的损伤。 微信公众号 ( Wechat Subscription) 欢迎关注 “结构之旅” 微信公众号

[结构设计][ENGT][超限设计] 不同模型剪力墙剪压比结果对比(ENGT超高层应用案例15)

坚持实干、坚持实践、坚持积累、坚持思考,坚持创新。 案例:采用ENGT(ENGT: Engineering Tookit [建筑结构辅助设计工具集成系统])进行剪力墙的剪压比分析,根据规范计算剪压比,进行受剪截面验算。 关于ENGT的更多信息,可以访问:ENGT: Engineering Tookit [建筑结构辅助设计工具集成系统] 对比刚性板及弹性板6情况下剪力墙的剪压比统计结果: 可见两者结果存在一定的差异,刚性板情况下,离散点较多。 微信公众号 ( Wechat Subscription) 欢迎关注 “结构之旅” 微信公众号

[结构设计][ENGT][超限设计] 墙轴压比分析(ENGT超限高层应用案例14)

坚持实干、坚持实践、坚持积累、坚持思考,坚持创新。 案例:采用ENGT(ENGT: Engineering Tookit [建筑结构辅助设计工具集成系统])进行墙的轴压比分析。 关于ENGT的更多信息,可以访问:ENGT: Engineering Tookit [建筑结构辅助设计工具集成系统] STEP 1: Import Model STEP 2: Show Wall only STEP 3: Pick the Wall STEP 4: Plot STEP 5: Export 2 …

[结构设计][钢结构][编程][工具] 钢板混凝土剪力墙轴压比计算及分析(Axial Load Ratio of Steel Plate-Concrete Composite Shear Walls)

坚持实干、坚持一线、坚持积累、坚持思考,坚持创新。 程序图标 ( Program Icon ) 程序介绍 ( Program Introduction) 剪力墙厚度、钢板及轴压比分析,工程师的计算器。 陆续做些设计小工具,设计有意思。 程序界面 ( Program Interface ) 微信公众号 ( Wechat Subscription) 欢迎关注 “结构之旅” 微信公众号

[书]PERFORM-3D原理与实例 – 第6章 – 剪力墙模拟

剪力墙的非线性分析模型可根据其基本假定的差异及单元自由度数量的多少划分为微观模型和宏观模型[1]。微观模型用实体或者板壳单元直接模拟剪力墙,原理清晰,但计算量大,收敛难以保证,宏观模型将剪力墙用多组非线性弹簧进行模拟,计算量小,试验分析校正相对简单,适用于结构整体弹塑性分析。PERFORM-3D[2,3]中提供了两种剪力墙宏观模型,包括能考虑单向压弯非线性的Shear Wall Element(剪力墙单元)及在此基础上进一步考虑复杂应力状态而开发的General Shear Wall Element(通用剪力墙单元)。其中Shear Wall单元采用的是多竖向弹簧单元模型(MVLEM)理论,为此,本章首先对MVLEM的研究背景及原理进行介绍,在此基础上介绍PERFORM-3D中提供的剪力墙组件及单元,最后采用PERFORM-3D中的Shear Wall单元对一悬臂剪力墙试件的拟静力试验进行模拟,详细讲解Shear Wall单元的基本建模过程和参数定义方法,并对模拟结果进行讨论。According to the difference of basic assumption and the number of degree of freedoms, the nonlinear analysis model of shear wall can be divided into microscopic model and macroscopic model. In microscopic model, shear wall is simulated by solid elements or shell elements. Microscopic model is clear in principle, but always has high calculation cost and the convergence is also difficult to assure. In macroscopic model, shear wall is simulated by multi-nonlinear-springs. When compared with microscopic model, macroscopic model always has lower computational cost and simpler parameters calibration process, which is suitable for elasto-plastic analysis of the whole structure. There are two types of shear wall macroscopic model in PERFORM-3D, including “Shear Wall Element” that can only consider one dimensional nonlinear bending and compression behaviour and “General Shear Wall Element” that can further consider complicated stress state. The Shear Wall Element adopts the theory of multi-vertical-line-element-model (MVLEM), therefore, the research background and the related theory of MVLEM was firstly introduced in this chapter. Then the shear wall components and elements in PERFORM-3D was further explained. After that, a pseudo-static test of cantilever shear wall was simulated by Shear Wall Element in PERFORM-3D. Through this simulation, fundamental modelling process, parameter definition, and interpretation of simulation results of Shear Wall Element were explained in detail.

[论文][Paper]Deformation Limits of L-Section RC Shear Walls (L形RC剪力墙的变形指标)

In order to establish the relation between damage state and member deformation of the L-section RC shear wall, 216 FE models designed to meet the requirements of the Chinese codes were set up. The analysis fully considers the variation of parameters including axial load ratio and shear span ratio etc. According to the results, criteria of classifying failure modes of L-section RC shear walls are proposed. Failure modes are determined by shear-span ratio, moment-shear ratio and end columns’ reinforcement ratio. Deformation limits corresponding to respective performance levels are put forward. Fitted formulas of calculating the limits are also presented. It is shown that the categorization criteria are reliably accurate in predicting failure modes. Deformation limits of a given L-section RC shear wall could be determined via axial load ratio and moment-shear ratio. The fitted formulas possess a satisfactory correlation with numerical results.

[PERFORM-3D][Tool] RC剪力墙纤维截面工具 [Shear Wall,Inelastic Fiber Section]

针对PERFORM-3D软件的RC剪力墙纤维截面剖分小工具。程序通过导入文本参数(.csv),直接生成纤维截面的参数,并导出PERFORM-3D需要的二进制文件(.PF3CMP)。This program is used for the data input of the “Inelastic Fiber Shear Wall Section” in PERFORM-3D. Through the import of section properties in text format (.csv), the program can generate the fiber section properties automatically. And then, the program export the binary data input file (.PF3CMP) for “Inelastic Fiber Shear Wall Section” which PERFORM-3D can then read to complete the fiber section definition.