浅谈钢筋混凝土框架节点的抗震加固方法及发展

本文结合工作经验，主要介绍了钢筋混凝土框架节点的破坏形式及其承载力的影响因素，并对目前常用的钢筋混凝土框架节点的加固方法进行了深入的论述，给出了各种方法的特点和加固机理以及设计计算方法。文中还提出了钢筋混凝土框架节点加固方法将来可能的发展方向，供同行参考。     

钢筋混凝土框架节点的破坏形式及承载力影响因素分析

本文讨论了钢筋混凝土框架节点的破坏形式及其承载力的主要影响因素,对目前常用的钢筋混凝土框架节点的加固方法进行了深入的论述,给出了各种方法的特点和加固机理以及设计计算方法。文中还提出了钢筋混凝土框架节点加固方法将来可能的发展方向。     

浅钢筋混凝土框架节点的抗震加固方法

本文讨论了钢筋混凝土框架节点的破坏形式及其承载力的主要影响因素,对目前常用的钢筋混凝土框架节点的加固方法进行了深入的论述,给出了各种方法的特点和加固机理以及设计计算方法。文中还提出了钢筋混凝土框架节点加固方法将来可能的发展方向。     

刍议钢筋混凝土框架抗震节点设计

笔者结合工作经验,以及对国内外相关资科的了解,在此基础上针对节点的性能和设计方法对钢筋混凝土框架抗震节点设计提出了自己的粗浅见解,供同行借鉴.     

钢筋混凝土框架节点抗震性能与设计方法研究

介绍了钢筋混凝土框架节点的优势,对钢筋混凝土框架节点抗震性能的部分影响因素进行了分析,并提出了几种常见的设计方法,实现了为实际工程中的抗震设计提供一些参考依据的效果。     

钢筋混凝土框架结构节点设计研究

针对节点在钢筋混凝土框架结构中的重要性,文章提出了钢筋混凝土框架节点设计参考,探讨了钢筋混凝土框架节点的受力机理,分析了提高钢筋混凝土框架节点抗震性能的措施以及节点构造设计要点,确保结构设计安全经济。     

直交梁钢筋混凝土节点轴压力学性能

本文在合理选取材料的本构模型基础上,利用大型通用有限元软件ABAQUS对直交梁钢筋混凝土节点轴压力学性能进行了计算分析。研究了直交梁端不同约束条件对框架角节点、边节点和中节点力学性能的影响,根据研究结果提出了设计建议。在本文研究基础上,可采用ABAQUS软件对钢筋混凝土节点的轴压力学性能与工作机理进行深入分析,本文的相关结论可供相关研究与工程参考。     

高层建筑钢筋混凝土框架结构节点设计方法探析

随着钢筋混凝土框架结构在高层建筑中的运用越来越广泛，框架节点的设计却依然有着一定的缺陷，本文作者根据施工现场部分钢筋混凝土的框架节点做出了相应的受分析及不利因素的解决办法，并结合现场实际情况进行了节点深化设计．不但保证了钢筋设计的合理性，满足施工规范的要求，同时也为施工提供了方便。     

浅谈钢筋混凝土框架结构节点设计

由于钢筋混凝土框架结构在近代建筑中运用的范围越来越广泛,框架节点在设计中存在一定的缺陷,本文通过对钢筋混凝土的框架节点设计准则进行研究及对节点设计要素所进行的分析,并对此提出了一些具有建设性的建议,相信可以为实践提供参考。     

浅谈钢筋混凝土框架结构的节点问题

针对节点在钢筋混凝土框架结构中的重要性,探讨了钢筋混凝土框架节点的受力机理,分析了影响钢筋混凝土框架节点抗震性能的因素,可供钢筋混凝土框架节点设计参考,确保结构设计安全经济。     

Moment resistance statistical distribution of beam-to-column composite joints

In seismic design of steel–concrete composite moment resisting frames, the randomness of beam-to-column joint rotational response can affect the location of dissipative zones. In fact, in case of full-strength joints, the dissipation of the earthquake input energy occurs at the beam ends; conversely, in case of partial-strength joints, the connection components of beam-to-column joints are involved. Within this framework, random material variability of joint components plays an important role, because it affects the joint flexural strength and, as a consequence, also the plastic rotation supply. Therefore, within the framework of a research program aimed at the evaluation of the seismic reliability of steel–concrete composite frames including random material variability, this paper focuses the attention on the analysis of the influence of random material variability on the rotational response of beam-to-column joints. In particular, the aim of the work is the evaluation, by means of Monte Carlo simulations, of the statistical distribution laws of the parameters describing, from the overall point of view, the rotational behaviour of beam-to-column joints. Such distribution laws represent important input data for a complete probabilistic seismic demand analysis of steel–concrete composite moment-resisting frames where the joint modelling is performed by using rotational spring elements whose parameters are selected as random values satisfying the distribution laws previously derived.     

梁柱组合节点受弯承载力统计分布

在钢-混凝土组合抗弯框架的抗震设计中,梁柱组合节点转动响应的随机性会影响能量耗散区域的位置。事实上,在节点的强度作用全部发挥的情况下,地震能量的耗散发生在梁端,相反地,在节点的强度作用部分发挥的情况下,则耗散也会发生在梁柱连接节点的连接部件上。在结构框架中,节点构件的材料随机性变化扮演了重要的角色,因为它影响了节点的弯曲强度,从而也影响了其塑性转角。因此,框架的研究项目旨在评估包括材料随机变化在内的钢-混凝土组合框架的地震可靠性,并着重分析了材料随机变化对梁柱节点转动响应的影响。特别是通过蒙特卡罗模拟法从整体来对梁柱节点转动性能描述参数的统计分布法则进行评估。这种分布法则提出了关于钢-混凝土组合抗弯框架的一个完整的概率地震需求分析的重要输入数据,而其节点建模所使用的转动弹簧的随机值参数也满足之前推断出的分布法则。     

钢筋混凝土柱-钢梁组合框架节点研究进展

钢筋混凝土柱-钢梁(RCS)组合框架是一种新型组合结构体系,它充分地利用和发挥了钢和钢筋混凝土构件各自的优点,是一种低成本、高效率的结构形式.系统地介绍了RCS组合节点和组合框架的研究和应用背景,阐述了RCS组合节点和组合框架的国内外研究现状,重点评述了RCS组合节点的试验研究和数值模拟研究两个方面的进展情况,介绍了RCS组合节点的抗震性能.最后,指出了RCS组合框架结构研究存在的问题和今后的发展趋势.     

碳纤维布加固混凝土框架抗震性能静力弹塑性分析

在碳纤维布加固混凝土十字节点和框架试件低周反复加载试验的基础上,根据原型框架实际设防要求引入能力谱方法,对采用不同碳纤维布加固方法的框架结构进行了静力弹塑性分析,对设防罕遇地震作用下加固框架的抗震性能进行评估,并作为加固设计具体量化的参考指标。     

钢梁-钢筋混凝土柱组合结构研究的进展

近年来,在组合结构中出现一种新型的结构形式,即由钢筋混凝土柱和钢梁(RCS)组成的框架结构。本文较为系统地阐述国际上RCS组合结构抗震性能的研究情况。主要包括RCS梁柱节点的试验研究、RCS组合框架的试验研究和有限元分析、RCS组合结构的抗震设计及性能分析,以及美日“设计指南”的完善与发展。最后指出RCS结构研究存在的问题和今后的研究趋势。     

基于节点的碳纤维布抗震加固混凝土框架方法Ⅱ:机理分析与加固效果检验

在碳纤维布加固混凝土十字节点试件和框架模型低周反复加载试验的基础上,讨论了碳纤维布-混凝土梁端加腋组合方法对于节点核心区的增强机理,提出了实用的设计计算公式。并根据原型框架的实际设防要求,引入能力谱方法,对碳纤维布加固框架结构进行了静力弹塑性分析,以现行抗震规范为准绳对框架结构以梁柱节点为中心整体加固后的抗震性能进行了检验。     

Post-earthquake fire and seismic performance of welded steel-concrete composite beam-to-column joints

The performance of steel-concrete composite full strength joints endowed with concrete filled tubes, designed with a multi-objective methodology dealing with seismic actions followed by fire is presented in this paper. In detail, instead of a traditional single-objective design where fire safety and seismic safety are independently achieved and the sequence of seismic and fire loading are not taken into account, the proposed design approach guarantees: (i) both seismic safety and fire safety with regard to accidental actions; (ii) fire safety for at least 15 min fire exposure on a joint characterised by stiffness deterioration and strength degradation due to seismic loading.In order to achieve the multi-objective design, full strength beam-to-composite tubular column joints were designed by means of the component method of Eurocode 4 Part 1-1 and Eurocode 3 Part 1-8, while Eurocode 4 Part 1-2 was considered for fire design. Moreover, to face a seismic-induced fire, they were enhanced with specific joint components which will be detailed.Both the experimental programme and the results provided by seismic tests, pre-damaged tests and fire tests carried out on beam-to-column joints are presented and discussed. The results demonstrate their adequacy in terms of design and performance. Moreover, non-linear numerical simulations clearly show that these joints can be deemed adequate for moment resisting frames of medium ductility class characterised by a behaviour factor of about 4.     

预制钢筋混凝土框架结构抗震性能研究进展(Ⅰ)——节点性能研究

阐述了预制装配式钢筋混凝土框架结构节点连接性能研究的重要性。介绍预制装配式钢筋混凝土框架结构节点连接性能研究的最新进展,所介绍节点包括预应力拼接节点、装配式节点、后浇整体式连接节点等。综述各类节点连接性能的刚度、强度、耗能性能及计算模型。介绍了国内外预制钢筋混凝土结构节点连接的设计规范及设计方法。最后指出,全装配式钢筋混凝土框架结构采用耗能节点对提高结构的抗震性能具有重要意义,开展装配式耗能节点及其结构体系的研究工作值得进一步重视。     

考虑框架结构中施工缝影响的试验研究

为了考虑在钢筋混凝土框架结构中施工缝的存在对抗震性能的影响,按照抗震设计规范合理设计了两个单榀两层两跨框架结构,一个是完全按照正常施工方法留置施工缝的框架,另一个框架则1一次性浇筑完毕未留置施工缝。通过对两个框架在低周反复荷载作用下的试验比较,对两个框架的破坏形态、滞回性能、位移延性、刚度退化、牯滞阻尼系数等性能进行深入对比分析,研究了框架结构中因为施工缝的存在而对结构整体抗震性能的影响。     

Seismic behaviour of infilled and pilotis RC frame structures with beam-column joint degradation effect

The influence of the exterior joints capacity deterioration on the local and global failure mechanisms of reinforced concrete structures with infills is investigated. Exterior beam-column joints with reduced capacity is the common case for the majority of RC structures designed according to older design standards. Nevertheless in common practise the response of these regions is typically assumed as rigid. A key parameter of this investigation is the inclusion of the joints strength and stiffness degradation in the study of the seismic performance of the structures. In this direction, a special-purpose rotational spring element that incorporates a special behaviour model is employed for the simulation of the exterior joints’ local response. The spring element has been incorporated in a well-established general program for nonlinear static and dynamic analysis. The effectiveness of the used joint element model has been demonstrated in a previous paper through comparisons with experimental data reported in literature. In this paper an attempt is presented for the investigation of the influence of the exterior joint damage on the seismic behaviour of bare and infilled RC frame structures. Two types of masonry infilled structures are considered: (a) infilled frame and (b) infilled frame without infills at the base storey (pilotis frame). A parametrical study of the overall seismic response using push over analyses and step-by-step analyses is performed. Results in terms of interstorey drifts, base shear, failure mode, ductility requirements and joints rotational requirements demonstrate that neglecting the possible local damage of the exterior joints may lead to erroneous conclusions and unsafe design or seismic behaviour evaluation that subsequently may become critical in some cases. Furthermore the influence of exterior joints degradation has been proven of vital importance for the overall behaviour of pilotis frames.