消能减震结构设计参数研究与试验验证

本文就消能减震结构设计参数,即消能部件的支撑刚度、层间最大阻尼力与结构层间屈服力比值等恢复力模型参数的选取进行了讨论。通过对消能装置的耗能特性理论分析,导出了消能装置产生的层间等效阻尼比与这些参数的关系曲线,建议了这些参数的合理取值范围。同时通过对两个消能减震试验结果的分析,验证了本文建议的参数取值的合理性。     

带可替换腹板连接型耗能梁段的恢复力模型研究

带可替换耗能梁段的偏心支撑钢框架具有震后修复方便、经济等优点,但目前国内外学者对该类型的研究很少。为此,设计16组与偏心支撑钢框架采用螺栓连接的腹板连接型耗能梁段,并对16组试件进行数值模拟分析,讨论截面尺寸、耗能长度、加劲肋间距、加劲肋布置以及综合参数等变化参数对腹板连接型耗能梁段在低周往复荷载作用下的滞回性能、骨架曲线的影响,建立腹板连接型耗能梁段简化的恢复力模型。结果表明,影响腹板连接型耗能梁段耗能的主要参数是截面尺寸,建立的恢复力模型与模拟的骨架曲线对比吻合较好,可以为此类耗能梁段弹塑性分析作为参考。     

铅挤压消能支撑框架模型结构试验研究

通过铅挤压消能器的低周反复加载试验,以及安装有铅挤压消能器的钢筋混凝土消能支撑框架模型结构的伪静力试验,主要研究了铅挤压消能器单独受反复荷载时的消能性能以及其在模型结构中所起的消能作用,模型结构的破坏机理和整体消能能力。研究结果表明,铅挤压消能器具有很好的消能能力,在模型结构总耗能中占据了很大的比例,模型结构具有较好的耗散地震能量的能力。     

工程结构粘弹性消能支撑型式及设计参数的研究

针对工程中的实际需要,提出一些新型的粘弹性消能支撑型式,分析了它们的受力特点,推导了消能支撑变形的表达式,并给出了其控制力的计算公式;最后,研究了影响结构消能效果的设计参数,给出了设计参数合理的取值范围。     

筒中筒结构内部摩擦连接消能减震体系的研究

提出利用筒中筒结构内筒和外筒的相对运动带动耗能装置耗能的的筒中筒结构内部摩擦连接消能减震体系。该体系将结构的内筒和框筒用专门设计的摩擦连接装置连接,罕遇地震下摩擦连接装置滑移产生滞回耗能。文中阐明了该体系的消能减震原理和构造特点,并通过对一栋40层筒中筒结构进行有限元分析,验证了该体系具有良好的抗震性能,可供工程实践参考。     

新型舌板黏滞阻尼器力学性能试验研究

本文提出了一种新型舌板黏滞阻尼器,通过对该黏滞阻尼器进行低周循环加载试验和抗低周疲劳性能试验,研究并验证了该阻尼器的耗能性能、抗低周疲劳性能及恢复力模型。研究结果表明:选取合适参数的舌板式黏滞阻尼器滞回曲线饱满,耗能性能与抗低周疲劳性能良好。Maxwell模型能够较好地描述该阻尼器力学行为,反映阻尼器在各种试验工况下的出力情况。该阻尼器设计与加工简单,对工程结构的耗能减震有着实际意义。     

基于等效框架模型的砌体结构抗震模拟及验证

等效框架模型采用宏观模型来模拟砌体墙在平面内的抗震性能。砌体墙的墙柱和墙梁采用同时考虑轴向弯曲和剪切变形的基于力法的纤维截面进行模拟,且两者的连接视为刚性区域。轴向压缩及弯曲效应在截面纤维模型中考虑,而剪切效应由V-γ剪切恢复力模型表达,弯曲和剪切在单元层面进行耦合。通过统计和分析,确定骨架曲线的计算方法,并基于Ibarra-Krawinkler模型提出剪切恢复力模型。通过算例得出:该模型在单调加载和循环加载下的数值计算结果与试验结果均吻合较好。     

Development of a ten-element hybrid simulation platform and an adjustable yielding brace for performance evaluation of multi-story braced frames subjected to earthquakes

This paper presents a ten-element hybrid (experimental-numerical) simulation platform, referred to as UT10, which was developed for running hybrid simulations of braced frames with up to ten large-capacity physical brace specimens. This paper presents the details of the development of different components of UT10 and an adjustable yielding brace (AYB) specimen, which was designed to perform hybrid simulations with UT10. As the first application of UT10, a five-story buckling-restrained braced frame and a special concentrically braced frame (BRBF and SCBF) were designed and tested with AYB specimens and buckling specimens representing the braces. Cyclic tests of the AYB, one- and three-element hybrid simulations of the BRBF, and four-element hybrid simulations of the SCBF inside the UT10 confirmed the functionality of UT10 for running hybrid simulations on multiple specimens. The tests also indicated that AYB was capable of producing a stable hysteretic response with characteristics similar to BRBs. Comparison of the results of the hybrid simulations of the BRBF and SCBF with their fully numerical models showed that the modeling inaccuracies of the yielding braces could potentially affect the global response of the multi-story braced frames further emphasizing the need for experimental calibration or hybrid simulation for achieving more accurate response predictions. UT10 provides a simple and reconfigurable platform that can be used to achieve a realistic understanding of the seismic response of multi-story frames with yielding braces, distinguish their modeling limitations, and improve different modeling techniques available for their seismic response prediction.     

SRC框支剪力墙结构地震反应简化分析模型研究

针对钢筋混凝土高层框支剪力墙结构抗震性能差的缺点,提出采用型钢混凝土（SRC）梁柱框支剪力墙,试验结果表明了其良好的抗震性能。提出了框支剪力墙结构地震反应简化分析模型,将结构简化为由墙单元和框支单元组成的弹簧体系,墙单元采用二元件模型。推导了框支单元刚度矩阵,基于理论公式和试验结果给出了框支单元恢复力模型。根据提出的简化模型,编制了结构地震反应时程分析程序。程序计算结果与ETABS分析结果及振动台试验结果吻合较好,为进一步对SRC框支剪力墙结构进行地震反应分析提供了理论基础。     

Experimental and numerical study of a self‐centering prestressed concrete moment resisting frame connection with bolted web friction devices

The self‐centering prestressed concrete (SCPC) moment resisting frame (MRF) with web friction devices (WFDs) is a new type of structure that integrates advantages of post‐tensioned precast concrete MRFs and self‐centering steel MRFs. In this paper, the configuration of the connection and design guidelines are presented. To further reduce damage to the connection under cyclic loading and facilitate implementation in practice, several significant improvements are proposed and experimentally validated in this study, including the following: (i) the welded connection is replaced by the bolted connection; (ii) aluminum plates are used for friction instead of brass plates to reduce the material costs without decreasing the energy dissipation capacity; and (iii) post‐tensioned tendons at the corners of the beam are replaced by a bundle of tendons at the beam centroid in order to facilitate the field assembly. The resulting improvements of seismic performances are experimentally demonstrated by 10 cyclic tests of two full‐scale SCPC beam–column connections. Numerical simulation of the proposed connection is conducted using the Open System for Earthquake Engineering Simulation (OpenSees) to replicate the experimental results. Seismic behaviors are taken into account, such as the gap opening/closing at the beam–column interface, the self‐centering capacity, and the friction energy dissipation. Good agreement is observed between the numerical simulation and the test results. The proposed SCPC connection with bolted WFDs is demonstrated to have good performance when subjected to cyclic loading. Copyright © 2013 John Wiley & Sons, Ltd.     

An interfacial mechanical model for the analysis of earthquake

IntroductionChina is a country suffered frequent earthquake disasters. The investigation on the mechanism of earthquake is of great significance. In the recent decades numerous researchers had carried out a great deal of research works on the theory of seismology and related in-situ observations (DU, SHAO, 1999; JIANG, et al, 1998; JIAO, et al, 1999; ZENG, SONG, 1998). However the mechanism of earthquake and relevant calculations still remain unsolved and problems still exists in pre…     

新型多级隔震装置试验及最优参数分析

基于橡胶支座和滑板支座的水平力学性能,开发了一种新型多级隔震装置并介绍了该装置的组成、运动状态及力学模型。为了验证多级隔震装置在多水准地震作用下具有多级刚度的特性,设计了一幢相似比为1/10的四层混凝土框架结构,并根据结构模型设计了四套多级隔震装置进行了新型多级隔震结构振动台试验。试验与模拟结果表明:新型多级隔震装置隔震性能良好且在不同水准地震作用下能表现出多级抗震性能,相较于普通隔震装置,在大震下能较好的控制隔震层位移。针对不同多级隔震结构给出了多级隔震装置的最优参数的筛选流程,并基于某实际工程通过筛选流程选取了装置的最优参数。     

Shaking table test and numerical analysis of a 1：12 scale model of a special concentrically braced steel frame with pinned connections

<正>This paper describes shaking table tests of a 1:12 scale model of a special concentrically braced steel frame with pinned connections,which was fabricated according to a one-bay braced frame selected from a typical main factory building of a large thermal power plant.In order to investigate the seismic performance of this type of structure,several ground motion accelerations with different levels for seismic intensityⅧ,based on the Chinese Code for Seismic Design of Buildings,were selected to excite the model.The results show that the design methods of the members and the connections are adequate and that the structural system will perform well in regions of high seismicity.In addition to the tests,numerical simulations were also conducted and the results showed good agreement with the test results.Thus,the numerical model is shown to be accurate and the beam element can be used to model this structural system.     

正断层黏滑错动作用下隧道抗错断技术模型试验研究

为提高穿越黏滑断层隧道的结构安全性和稳定性,开展了正断层黏滑错动作用下隧道抗错断措施作用效果室内模型试验。通过分析结构纵向应变、接触压力及安全系数,对未采取措施、结构加强、结构加强并施设减错层、结构加强并施设减错缝、结构加强并施设减错层和减错缝5种工况进行了对比分析。研究结果表明:采用减错措施（减错层/缝或减错层+减错缝）后,沿隧道纵向结构纵向应变、接触压力增加倍数由剧烈变化变为较均匀变化;仅采用结构加强措施抵抗正断层黏滑错动对隧道结构的影响,效果有限;通过采用减错措施消减正断层黏滑错动对隧道结构的影响,效果明显,结构安全系数最小值增加8倍以上;通过采用结构加强并施设减错层和减错缝措施抵抗和消减正断层黏滑错动对隧道结构的影响,效果显著,结构安全系数最小值增加25.45倍。研究成果可为高烈度艰险山区黏滑正断层隧道的抗错断设防设计提供参考。     

一种新型软钢阻尼器力学性能和减震效果的研究

本文研究了一种新型软钢阻尼器。首先分析了这种阻尼器的力学性能和减震机理，依据试验结果给出了它的恢复力模型，并推导得出了特征参数的表达式和疲劳验算式；研究了阻尼器参数对减震效果的影响，给出了最佳的参数取值范围；算例分析表明该种阻尼器具有很好的减震效果。