Dynamics [动力学] / Earthquake Engineering [地震工程] / Earthquake isolation and reduction [隔震减震] / Finite Element Method [有限元法] / My Software [我的软件] / Programming [编程] / Reinforced Concrete [钢筋混凝土] / Structural Analysis [结构分析] / Structural Engineering [结构工程]

[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.

Dynamics [动力学] / Earthquake Engineering [地震工程] / PKPM & YJK / Reinforced Concrete [钢筋混凝土] / Structural Analysis [结构分析] / Structural Design [结构设计] / Structural Engineering [结构工程]

[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。）

Dynamics [动力学] / Earthquake Engineering [地震工程] / Earthquake isolation and reduction [隔震减震] / Structural Design [结构设计] / Structural Engineering [结构工程]

地震反应谱的特性(The Characteristics of Earthquake Response Spectrum)

最近很开心，前段时间分享了 SPECTR — 地震波反应谱计算工具， 许多网友使用过软件后都给我回馈。本文利用 SPECTR 软件，对几个实测地震加速度记录进行反应谱分析，总结常用反应谱的一般特性，和大家一回顾反应谱的一些基本概念，也当做 SPECTR 的一个典型的应用吧。先将总结的资料分享给大家，也算回馈支持网站建设的朋友，希望大家能够继续支持，也欢迎大家相互交流学习。

Civil Engineering Test [土木工程试验] / Dynamics [动力学] / Earthquake Engineering [地震工程] / Finite Element Method [有限元法] / Nonlinear FEM [非线性有限元] / PERFORM-3D / Reinforced Concrete [钢筋混凝土] / Simulation Analysis [仿真分析] / Structural Analysis [结构分析] / Structural Engineering [结构工程]

[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。

Dynamics [动力学] / Earthquake Engineering [地震工程] / My Software [我的软件] / Programming [编程] / Structural Analysis [结构分析] / Structural Design [结构设计] / Structural Engineering [结构工程]

[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/ .

Dynamics [动力学] / Earthquake Engineering [地震工程] / Finite Element Method [有限元法] / My Software [我的软件] / Programming [编程] / Structural Engineering [结构工程]

[动力学][软件][Tool] MDOF_Eigen: MDOF Modal Analysis [多自由度结构模态分析]

分享一个小程序，该程序是之前我在上结构动力学课的时候编制的。程序主要用于进行剪切形框架结构（即，糖葫芦串模型）的模态分析。可以使用该程序求解动力学课本后面的习题。阵型求解使用雅克比迭代法。This program is developed by me in the Structure Dynamics class. It is for modal analysis of shear building (i.e. , flexurally rigid floor beams and slabs ) with lumped mass at each floor.You can use the program to explore eigenvalue problems on you textbook and improve your understanding on free vibration. The program use Jcaobi method for the solution of eigenvalues.

Dynamics [动力学] / Earthquake Engineering [地震工程] / Finite Element Method [有限元法] / My Software [我的软件] / Programming [编程] / Structural Analysis [结构分析] / Structural Design [结构设计] / Structural Engineering [结构工程]

[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