[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.

Torsion analysis by thermal analogy with ANSYS (ANSYS热比拟扭转应力分析)

稳态热传导控制方程与扭转控制方程具有相似性。利用ANSYS中的稳态热传导分析功能通过比拟的方法进行截面的扭转应力分析。The steady heat conduction problem and the classic torsion theory have analogy in their control partial differential equations. We can conduct a torsional analysis making use of the steady analysis fuction in general finite element program.This post gives an example on how to do torsion analysis as thermal analogy with ANSYS.

[论文][Paper]强震作用下基于构件性能的钢筋混凝土框架结构抗倒塌能力评估

以钢筋混凝土构件的变形性能指标限值为基础,建立基于构件性能的钢筋混凝土结构抗倒塌极限状态判别准则,并提出了”抗倒塌能力系数”的概念,用以定量评估结构的抗地震倒塌能力。在此基础上,按现行相关规范设计了27个典型钢筋混凝土框架结构,并采用文中建议的方法对结构在地震作用下的抗倒塌能力进行评估。结果表明:高度相同的框架结构,抗震等级越高,抗倒塌能力越强;抗震等级相同的框架结构,高度越大,抗倒塌能力越小;3层和6层框架结构的抗倒塌能力系数值大于1,具有足够的抗倒塌能力;抗震等级为二级的9层框架结构抗倒塌能力系数在0.5~0.8之间,应提高结构的抗倒塌能力;柱的轴压比和配筋率对框架结构的抗倒塌能力有较大的影响;框架结构层间位移角最大的楼层不一定是构件破坏最严重的楼层,仅用层间位移角评估结构的抗震性能尚有不足。

[论文][Paper]基于变形的框架-剪力墙结构抗震安全性评估

将结构整体变形和构件变形作为双重控制指标,提出了罕遇地震作用下结构的安全性评估方法,对按GB 50011—2010《建筑抗震设计规范》设计的典型框架-剪力墙结构在罕遇地震作用下的安全性进行评估。结果表明:以层间位移角作为大震性能评估的唯一标准存在不足,结构的最大层间位移角与结构构件损伤没有直接关系,统计得出框架-剪力墙结构首层层间位移角限值为1/200;引入长周期反应谱影响系数以考虑地震波反应谱形状的影响,并给出建议影响系数取值为0.9~1.05;Ⅱ类~Ⅳ类场地土中7度及7.5度抗震设防的模型均满足安全性要求,8度设防出现个别模型不满足安全性要求。

[论文][Paper]基于构件变形的钢筋混凝土剪力墙结构抗震性能研究

以钢筋混凝土构件的变形性能指标限值为基础,提出基于构件性能的钢筋混凝土剪力墙结构抗震性能判定准则和评估方法,并给出结构“抗大震能力储备系数”的概念,用以定量评估结构抵抗特大地震的能力储备。在此基础上,按现行规范设计了27个剪力墙结构模型$采用有限元分析软件PERFORM-3D进行弹塑性动力时程分析和IDA分析,并采用文中提出的结构性能判定准则和方法对结构进行性能评估。结果表明,剪力墙结构层间位移角大小与构件损伤程度不相符合,仅用层间位移角评估结构的抗震性能尚有不足;在7度0.1g、7度0.15g、8度0.2g抗震设防烈度下,场地特征周期为0.35s和0.45s的结构能够满足规定的性能要求,场地特征周期为0.65s的结构大多不能满足性能要求;按0.35s和0.45s场地特征周期设计的结构抗大震能力储备系数大多在1.2~1.4,具有一定的抵抗特大地震的能力储备。

[Tool][软件][动力学]NSDOF v2016: A Tool for Nonlinear Dynamic Analysis of SDOF System (NSDOF: 单自由度系统动力非线性分析工具)

SDOF是一个基于微软的windows窗口程序,用于单自由度结构的动力非线性分析。结构可是弹性也可以是弹塑性。动力荷载可以是施加在结构基座的地震加速度,也可以是施加在结构顶部的动力荷载。程序使用逐步积分法求解增量非线性运动方程。SDOF is a Microsoft Windows based application for the dynamic analysis of single degree of freedom structural systems. The structure may be modeled as elastic, elastic-plastic. The dynamic loading may be input as an earthquake accelerogram acting at the base of the structure, or as a dynamic force applied at the roof of the structure. The program uses a step-by-step method to solve the incrementally nonlinear equations of motion.

[加固改造] CAD2XTRACT 插件复杂嵌套截面建模实例(外包钢板加固改造案例) [CAD2XTRACT plugin complex nested section modeling example (outsourcing steel plate reinforcement and renovation case)]

CADtoXTRACT 插件复杂嵌套截面建模实例。许多第一次使用插件的用户不太知道如何入手建模,其中使用者提问得比较多的是对于复杂嵌套截面的建模问题。为此,这里以一个外包钢板加固型钢混凝土柱嵌套截面的XTRACT建模为例,对此类问题进行说明。对于其他嵌套截面的建模,用户可以参考照这个例子举一反三。

[GMS][地震波][选波] YJK地震波反应谱分析与地震波选取 (seismic wave response spectrum analysis and seismic wave selection)

在选波的过程中发现YJK弹性时程分析反应谱与规范谱对比出现不匹配现象,经过测试发现,积分时长不但控制地震波的地震时间,而且控制地震波反应谱的计算。(1)在使用 YJK进行 时程分析时,积分时长 参数不但作为地震时程分析的持时,也作为地震反应谱计算的持时。积分时长 参数的同时影响时程分析和反应谱计算。(2)若积分时长过小,则 YJK 计算的反应谱将与地震波真实的反应谱相差过大,若以这个地震波反应谱和规范反应谱是否拟合作为选波的参考,将可能导致选择错误的地震波。如本文的例子,若选择过小的积分时长(35s)并以此计算的地震波反应谱对比图来参考选波,则很可能会选到一些持时大于35s,且以前35s加速度计算的反应谱和规范普较为匹配的地震波,而这些地震波真实的反应谱很可能远远大于规定的反应谱,从而导致错误的选取强度偏大的地震波。(PS. 这种情况,偏强的地震波由于持时取小了,那么小震弹性时程计算的基底剪力也很可能是满足规范要求的,即无法发现选波错误。)

Mander Confined Concrete Model 资料整理

箍筋的配置对核心混凝土具有侧向约束作用,可以显著提高混凝土的强度和延性。工程实践中,常采用约束混凝土本构模型来考虑箍筋对核心混凝土的约束作用。目前已提出多种模型,其中Mander混凝土本构模型是较为常用的约束混凝土模型之一,该模型由Mander、Priestley和Park于1988[1]年提出。将Mander约束混凝土模型(Confined Concrete Model)的参数取值方法整理成文档,给出实例,并编制Excel表格,方便使用。

[PERFORM-3D] A discussion of two methods of conducting low-frequency cyclic test modeling in PERFORM-3D [关于PERFORM-3D中低周往复试验模拟的两种方法的探讨]

A discussion of two methods of conducting low-frequency cyclic test modeling in PERFORM-3D。关于PERFORM-3D中低周往复试验模拟的两种方法的探讨。

[PERFORM-3D][Tool] 圆形柱纤维截面工具 [Column,Inelastic Fiber Section -Circular Section]

针对PERFORM-3D软件的圆形柱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 Column 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 Column Section” which PERFORM-3D can then read to complete the fiber section definition. This program will definitely save you time on the input of the structural fibers.

[PERFORM-3D][Tool] 箱形柱纤维截面工具 [Column,Inelastic Fiber Section – Box Section]

针对PERFORM-3D软件的箱形柱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)。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 Column Section” which PERFORM-3D can then read to complete the fiber section definition.

[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.

[PERFORM-3D][Tool] 矩形RC柱纤维截面工具 [Column,Inelastic Fiber Section – RC Rectangular Section]

针对PERFORM-3D软件的RC矩形柱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)。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 Column Section” which PERFORM-3D can then read to complete the fiber section definition.

[PERFORM-3D][Tool] 矩形RC梁纤维截面工具 [Beam,Inelastic Fiber Section – RC Rectangular Section]

针对PERFORM-3D软件的RC矩形梁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)。然后通过PERFORM-3D导入.PF3CMP文件完成繁琐的纤维截面输入工作,节省你的时间。This program is used for the data input of the “Inelastic Fiber Beam Section” in PERFORM-3D.

[科研][软件][试验] HLAV: Hysteresis Loop Animation Viewer [滞回环动画演示软件]

分享一个小程序,用于观察滞回环动画。软件是免费的。如果你发现软件有bug或者软件使用有问题,请联系我!邮箱:jidong_cui@163.com.A small program to share with you.Hysteresis Loop Animaion Viewer.This app is free . If you have found any bug in the program or have any problem when using the program, please don’t hesitate to contact me directly. Email : jidong_cui@163.com

[软件][Tool] NGA Converter: PEER NGA Ground Motion Convertor [PEER地震波数据格式转换器]

太平洋地震工程研究中心(PEER)强震数据库格式转换器。程序可以将原本5列的地震波数据转换成任意列,并支持地震波峰值的调整、地震波时间间距的调整,方便工程和研究。程序支持转换旧数据库(NGA-West)和新数据库(NGA-West2)的地震波文件。NGA-West2 网址: http://ngawest2.berkeley.edu/。A program can be used to transform a PEER Ground Motion Database file into a user-specified format suitable for other applications to use.The program can transform the data format from 5-column to any column. The peek value and time step of the ground motion can also be adjusted . It’s easy to use.The program supports both the NGA-West and NGA-West2 Database file . The address of NGA-West2 Database : http://ngawest2.berkeley.edu/ .

[下载][软件][动力学]RDCC: Rayleigh Damping Coefficients Calculator [瑞利阻尼系数计算器]

分享一个小程序,该程序用于计算瑞利阻尼系数。软件是免费的。如果你发现软件有bug或者软件使用有问题,请联系我!邮箱:jidong_cui@163.com. A small program to share with you. The program is for Rayleigh Damping Coefficients Calculation.This app is free . If you have found any bug in the program or have any problem when using the program, please don’t hesitate to contact me directly. Email : jidong_cui@163.com