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免费版本2018-01-05
ETABS TO PERFORM-3D
Author: dinochen1983
Time: 2023-12-31
[小记]ETE2018是由陈学伟(DINO)与李明(LI MING)开发的集成程序,它可以完成结构概念设计
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ETE2018
Author: dinochen1983
Time: 2023-12-27
ETABS to ABAQUS 内置于 ETE2018
ETABS to ABAQUS
Author: dinochen1983
Time: 2023-12-09
分类: 论文 |
预览模式: 普通 | 列表

Research On The Seismic Design Of Transfer-Storey Structures Based On Philosophy Of Capacity Design Under Severe Earthquake
Jack CHEANG Han Xiaolei  Tang JianQiu   Chen Xuewei

ABSTRACT :
Both theoretical analysis and engineering applications of the transfer-storey structures are mostly limited in elastic stage under frequent earthquakes; the structural behavior after yielding under severe earthquake need to be studied by elastic-plastic analysis. And there is no specific and quantitative method to ensure that transfer structures can “resist severe earthquake without collapse”.  In this paper, the philosophy of capacity design is introduced into the design of transfer-storey structures and a practical design method for transfer structures under severe earthquake is presented. Through push-over analysis, various limit states of coupled shear walls are disclosed. Parameters that influence significantly the structure behavior such as integer coefficient of coupled shear walls, reinforcement ratio of coupling beams and height-width ratio of shear walls are highlighted. The shear overstrength of the coupling beams under the ideal limit state is reduced with reduction coefficient K. Overstrength of shear walls is derived by ultimate state analysis, which considers the axial forces increment of shear walls caused by shear overstrength of coupling beams. On this basis, mechanical characteristics and capacity based seismic design method of transfer storey under severe earthquake are studied by elastic-plastic analysis. A series of nonlinear dynamic time-history analysis has been completed, which considers the influence of varied parameters including the stiffness and mass of transfer structures, seismic protected intensity and the position of transfer storey. Moreover, the simplified formulas and the detail procedure for capacity design of transfer structures are presented.

KEYWORDS: philosophy of capacity design, design of transfer-storey, structural overstrength, push-over analysis, nonlinear dynamic time-history analysis, severe earthquake

Download:RESEARCH ON THE SEISMIC DESIGN OF TRANSFER-STOREY STRUCTURES BASED ON PHILOSOPHY OF CAPACITY DESIGN UNDER SEVERE EARTHQUAKE

基于纤维模型的CFRP布加固混凝土柱有限元分析
   
陈学伟 韩小雷  季静  郑宜

摘  要:在新型加固技术中,利用纤维增强复合材料(FRP)布横向包裹钢筋混凝土柱可以改善其抗震性能。对CFRP布加固的混凝土柱进行的有限元分析可以对加固后的柱子进行承载力与抗震性能的评估。本文采用基于纤维模型的OpenSees非线性有限元软件,对CFRP加固的矩形柱试件进行模拟分析,并与文献中的试验结果进行对比。对比结果表明用OpenSees的纤维模型可以有效地对构件和结构进行加固后的承载力及抗震性能分析。      
关键词:纤维增强复合材料布 加固结构 非线性有限元 纤维模型
     


  

基于OpenSees的预应力混凝土构件弹塑性分析

陈学伟  何伟球

提要:近年来预应力技术得到广泛应用,深入研究预应力混凝土结构或构件的受力及变形性能有着重要的工程意义。由于预应力混凝土构件的力学行为复杂,因而变形的计算往往需要借助有限元模型实现。本文基于纤维单元的开源结构有限元分析程序OpenSees,编制了预应力混凝土构件的数值分析模型。利用该模型对两跨有粘结预应力连续梁进行受力及变形分析,得到P-△曲线,并与参考文献的试验结果进行对比。经过分析,可以得出以下结论: OpenSees可以对预应力结构的进行弹塑性分析,并且具有自由度数少,模型直观简单等优点,可应用于工程设计与分析。
关键词:预应力混凝土,纤维模型,非线性有限元,OpenSees

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2008年上半年,我开始研究大跨度楼板的振动分析方法,通过研究发现,很多理论来源于单自由度体系的公式推导,对于特殊边界及支承条件的楼板,这些公式显得太过粗糙。因此,我在考虑基于SAP2000良好的二次开发环境,做一个楼板振动分析的前后处理,接入SAP2000进行时程分析.基于这些思考,我开始了楼板振动分析的研究,研究了半年时间,初步出了一些成果。
对于楼板荷载生成程序及人群活动楼板振动的验算理论,我总结了一下,并写成论文《The Research of Time-History Response Analysis of Floor Vibration Based on Simulation of Group Walking》(《基于人群走动仿真的楼板振动时程分析方法的技术研究》)发表在国际会议《2008建模、计算、仿真、优化及其应用学术会议》,并发表在论文集上面,现与大家分享一下。

The Research of Time-History Response Analysis of Floor Vibration Based on Simulation of Group Walking

Chen Xuewei,Han Xiaolei,Jack CHEANG, He Weiqiu,Ji Jing

Abstract. Occupant comfort when large-span floor systems are subjected to crowd-induced vibrations has become an important index to evaluate serviceability of structures. Control of deflections stipulated in current code requirements cannot sufficiently represent the serviceability requirements of floor systems. Harmonic vibration analysis procedure is introduced by foreign code requirements to deal with floor vibrations, with the restriction to those with regular shapes and simple boundary conditions. This paper proposes a time-history analysis program for the generation of load induced by human activities based on the stimulation of group walking, analyzing the floor systems with special boundary condition, span and damping by time-history method. Compared with the results of crowd-induced load experiment, the analytical results confirmed the accuracy of this analysis procedure in representing the characteristic of crowd-induced floor vibrations,which is applicable for evaluation of floor systems with arbitrary shape and boundary condition.

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2008年投了两篇与OPENSEES的工程研究应用相关的论文被《地震工程与工程振动》及《世界地震工程》所录用。一篇是关于剪力墙宏观单元的研究,另一篇是关于blind-analysis比赛的足尺钢架分析的研究成果。《世界地震工程》的剪力墙单元研究是对早前的剪力墙往复试验分析的一个单元性态研究的补充,相关细节的内容,等论文刊登后发表至网上。编辑部来消息,剪力墙的论文可以在今年2008年的12月发表出来,太开心了。