改善钢筋混凝土短柱抗震性能的研究     

宋义平  曹万林  张建伟  王新杰  范燕飞  王志惠 《世界地震工程》2007,23(1):17-20

简要介绍了改善钢筋混凝土短柱抗震性能的若干措施。为进一步提高短柱的抗震性能，本文提出了内藏“斜向劲性核心束”矩形截面混凝土短柱，并进行了7根短柱的抗震性能试验研究，试验表明，内藏“斜向劲性核心束”矩形截面混凝土短柱比普通矩形截面短柱的抗震性能显著提高。  相似文献   

海绵骨针特性及其仿生学研究   总被引：6，自引：0，他引：6  

王晓红  王毅民 《地球科学进展》2006,21(10):1008-1013

海绵是生长在海洋或淡水环境中的一种最简单的多细胞生物，3个主要海绵纲中有2个纲的海绵其主要骨架与支撑是玻璃纤维状的硅质骨针。近年来，人们发现了硅质海绵骨针独特的微结构及良好的光纤特性，特别是指出了这些特性给人类带来制造光纤的新思路，并很快引起了科学家对其结构、特性、生长机制与调控的生物学、生矿物学和仿生学的广泛研究兴趣。评述了海绵骨针内部结构和光学特性的发现、海绵骨针研究的热点领域及研究意义，并简要介绍了海绵骨针的国内外研究概况及主要工作。  相似文献   

Pre‐ and post‐test mathematical modelling of a plan‐asymmetric reinforced concrete frame building     

Peter Fajfar  Matja Dol&#x;ek  Damjan Maru&#x;i&#x;  Aurel Stratan 《地震工程与结构动力学》2006,35(11):1359-1379

Pre‐ and post‐test analyses of the structural response of a three‐storey asymmetric reinforced concrete frame building were performed, aimed at supporting test preparation and performance as well as studying mathematical modelling. The building was designed for gravity loads only. Full‐scale pseudo‐dynamic tests were performed in the ELSA laboratory in Ispra. In the paper the results of initial parametric studies, of the blind pre‐test predictions, and of the post‐test analysis are summarized. In all studies a simple mathematical model, with one‐component member models with concentrated plasticity was employed. The pre‐test analyses were performed using the CANNY program. After the test results became available, the mathematical model was improved using an approach based on a displacement‐controlled analysis. Basically, the same mathematical model was used as in pre‐test analyses, except that the values of some of the parameters were changed. The OpenSees program was employed. Fair agreement between the test and numerical results was obtained. The results prove that relatively simple mathematical models are able to adequately simulate the detailed seismic response of reinforced concrete frame structures to a known ground motion, provided that the input parameters are properly determined. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   

Mechanical compression release device in steel bracing system for retrofitting RC frames     

H. Ghaffarzadeh M.R. Maheri 《地震工程与工程振动(英文版)》2006,5(1):151-158

1 Introduction Braced steel frames are commonly used to resist seismic loads. Their seismic behavior was extensively studied during the past decades (Bertero et al.., 1989; Roeder, 1989; Jain, 1978). Their design is governed by the buckling behavior of the bracing members (ASCE, 1994,2002; CSA, 1994). To prevent or delay the seismic buckling of compressive members in concentrically braced frames in steel structures, a great number of methods have been proposed. These include the use of sp…  相似文献   

基于能量原理的钢筋混凝土简体结构抗震性能研究     

朱建华  沈蒲生 《地震工程与工程振动》2006,26(5):109-113

本文通过能量法研究了钢筋混凝土简体结构的抗震性能。文中采用振型分解法按等效单自由度体系求解简体结构的滞回输入能；用pushover法分析了滞回耗能在结构层间的分布规律及结构自身的耗能能力；根据楼层滞回耗能与弹塑性层间位移的关系求出了薄弱层的弹塑性位移。对一高层钢筋混凝土框架-简体结构在7度罕遇地震下的抗震性能进行了评估，通过与非线性动力时程分析的对比，证明了方法的可行性。  相似文献   

钢筋混凝土扁梁柱节点抗震设计方法   总被引：1，自引：0，他引：1  

戴益华 《地震工程与工程振动》2006,26(1):122-128

为考虑扁梁柱节点内、外核心区的相互作用,对扁梁柱节点的内、外核心区进行了重新划分,认为内、外核心区有一个重叠的区域,给出了地震作用在扁梁柱节点内外核心区的分配方法,采用压杆模型和软化桁架模型,提出扁梁柱节点的设计方法。该方法可以考虑节点核心区钢纤维和扁梁中无粘结预应力对扁梁柱节点抗剪极限承载力的作用。该设计方法的可靠性得到四个钢筋混凝土扁梁柱节点试验数据的验证。  相似文献   

型钢混凝土梁柱框支剪力墙结构抗震性能试验研究   总被引：3，自引：0，他引：3  

李国强  崔大光  李一松 《地震工程与工程振动》2006,26(2):80-87

框支剪力墙结构在实际工程中经常被采用,震害表明钢筋混凝土框支剪力墙结构抗震性能较差,本文提出型钢混凝土梁柱框支剪力墙结构对此加以改进。作者进行了4个1/4缩尺模型在竖向荷载和单调及低周反复水平荷载作用下的对比试验,其中3个试件采用型钢混凝土转换梁、型钢混凝土框支柱,1个试件采用钢筋混凝土转换梁、钢筋混凝土框支柱。我们分析其承载力、刚度、变形、延性和破坏形态等。试验结果表明,型钢混凝土梁柱框支剪力墙结构承载力高、延性好、滞回曲线丰满,变形能力和耗能能力较强。  相似文献   

钢骨混凝土结构抗震研究综述     

吴平川  张令心  杨克勇 《世界地震工程》2007,23(4):13-18

介绍了钢骨混凝土结构的特点以及抗震研究发展现状，指出了这种结构在抗震研究中存在的主要问题和今后需要进一步研究的方向。  相似文献   

Towards error‐free hybrid simulation using mixed variables     

Tarek Elkhoraibi  Khalid M. Mosalam 《地震工程与结构动力学》2007,36(11):1497-1522

Two procedures are developed and implemented in a hybrid simulation system (HSS) with the aim of enhancing the accuracy and reliability of the online, i.e. pseudo‐dynamic, test results. The first procedure aims at correcting the experimental systematic error in executing the displacement command signal. The error is calculated as the difference between command and feedback signals and correlated to the actuator velocity using the least‐squares method. A feed‐forward error compensation scheme is devised leading to a more accurate execution of the test. The second procedure employs mixed variables with mode switching between displacement and force controls. The newly derived force control algorithm is evaluated using a parametric study to assess its stability and accuracy. The implementation of the mixed variables procedure is designed to adopt force control for high stiffness states of the structural response and displacement control otherwise, where the resolution of the involved instruments may favour this type of mixed control. A simple pseudo‐dynamic experiment of steel cantilever members is used to validate the HSS. Moreover, two experiments as application examples for the two developed procedures are presented. The two experiments focus on the seismic response of (a) timber shear walls and (b) reinforced concrete frames with and without unreinforced masonry infill wall. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   

Introduction of structural aseismic research in China in recent four years     

罗奇峰  石春香  曹炳政  杨树龙  熊华  李仕栋 《地震学报(英文版)》2003,16(6):656-675

Introduction Greeting the coming of the 21st century, Professor HU Yu-xian and other Chinese scholars briefed the trend of earthquake engineering in China and aboard (HU, 1999; HU, ZHOU, 1999). The experiences and lessons learning from the destructive earthquakes in China and abroad in re-cent years, the damage action of the large velocity impulse in ground motion in near field in seis-mic design, numerous earthquake examples show that there are many weaknesses in aspects of earthquake p…  相似文献