浅谈框架结构的抗震设计

介绍了框架结构中对抗震设计的要求,从框架结构的抗震等级、结构延性、节点核心区设计、构造措施等方面进行了论述,指出为提高框架抗震能力,在实际工程中抗震概念设计尤为重要。     

钢框架梁柱节点脆性破坏的分析与改进

对钢框架焊接节点发生脆性破坏的原因进行了分析，综合国内外研究成果提出了节点构造改进方法，从而有效地增加结构的耗能能力和延性，抗震性能大为改善。     

基于我国规范RC框架结构的延性折减系数

提出了一种基于能力谱原理的多自由度体系延性折减系数计算方法,然后依据我国抗震规范按照不同高度、不同设防烈度设计了三组九个RC框架结构,并采用Pushover方法计算了它们的延性折减系数、超强系数和强度折减系数.发现高烈度区的结构,在相同高度下具有较低的储备强度,而在相同设防烈度下,结构越高强度储备越低.根据研究结果,指出了我国现行抗震规范下RC框架结构地震作用取值中的不足,并提出了对规范的修改建议.      

新型木建筑材料——交叉层积木介绍及其连接的试验研究

交叉层积木作为一种新型木建筑材料已经在北美地区推广开来,然而在我国还没有得到引进和推广.本文介绍了这种新型材料的性能特点,总结其生产工艺、设计方法和研究进展,重点对交叉层积木七种半刚性连接的抗震性能进行试验研究.研究表明:紧固件全部被拔出的失效模式为理想的延性破坏模式,滞回曲线表现出高度非线性、刚度退化、强度退化以及捏拢现象.通过试验数据分析,给出了在延性和承载能力两方面最佳的连接.      

底层框架砌体结构抗震设计分析

底层框架砌体结构是指仅部分砌体纵横墙落地,在底层大空间位置采用框架的混合建筑形式。底层框架砌体结构具有一定的经济优势,但这种结构体系为上刚下柔,抗震性能较差。从刚度、强度、延性几个方面对这种结构体系抗震性能进行了分析,提出了抗震概念设计的几点建议。     

多层住宅砖混房屋设计中构造柱设置及应用

设置构造柱在多层砖混结构房屋中对抗震能力，整体性、延性及承载力有明显的提高作用。     

GB 1499．2—2007抗震性能探讨

介绍了目前新兴铸管股份有限公司螺纹钢筋的延性指标不够理想,对符合GB 1499．2—2007抗震性能的延性指标进行了简要分析和控制,目的是解决GB 1499．2—2007抗震性能符合性的问题。     

轻质混凝土拼装墙板填充钢框架协同抗震性能试验研究

为了研究墙板与钢框架结构之间的协同抗震性能,对采用不同墙框连接节点的轻质混凝土拼装墙板填充钢框架进行了低周往复荷载试验。通过对比试件的承载力、滞回性能、刚度、耗能以及延性性能,探讨了轻质混凝土拼装墙板及其整体性对结构抗震性能的影响。结果表明:填充墙板钢框架结构的最终破坏形态以墙板挤压开裂,框架梁柱端部翼缘屈曲为主;轻质混凝土拼装墙板与钢框架协同工作,有利于提高结构整体的承载力和变形能力,减轻钢框架在平面内的屈曲破坏;与刚性节点相比,采用柔性节点连接墙板与钢框架对结构的承载力、层间刚度和耗能能力更为有利;增强拼装墙板的整体性,有助于提高结构整体刚度、变形和耗能能力。研究结果可为轻质混凝土拼装墙板填充钢框架结构的抗震设计提供参考。      

地震工程学在桥梁抗震设计中的应用研究

在我国目前的桥梁抗震设计和分析中,主要研究的是各种类型桥梁的地震反应分析方法、设计方法、抗震构造措施等,对地震工程学方面的理论研究甚少,从而导致地震学与结构抗震两者之间缺乏联系,脱离了地震谈抗震.近年来,随着基于性能的地震工程学和抗震设计理论的出现以及不断发展,地震学的重要性日益凸显,因此必须将地震学与结构抗震有机联系起来.     

钢筋混凝土——砌体组合墙结构的分析和应用

扼要分析了钢筋混凝土-砌体组合结构形式的特点和其抗震受力变形性能,论述了这种结构的应用和研究进展,提出了抗震设计中尚存在的和应解决的问题。     

地震灾害与地震区建筑用钢探讨

为进一步研制建筑用钢筋的抗震性能,根据"建筑抗震设计规范"对钢材的规定,提出了地震区建筑用钢的研制开发技术要求。为提高建筑物的安全性,在建筑设计时必须按抗震设防要求进行设计。钢材的选用,必须满足结构件塑性铰区实现转动,以耗散地震时能量,提高建筑物安全系数,减少地震损失。     

加强抗震观念 减轻地震灾害

本文根据唐山地震及汶川地震的震害分析,结合《建筑抗震设计规范》(GB 50011-2001 2008年版)提出抗震设计时应注意的几点看法。呼吁全社会加强抗震观念,从而减轻地震灾害。     

浅谈抗震构造在结构设计中的重要性

本文根据唐山地震、汶川地震及玉树地震的震害分析,结合《建筑抗震设计规范》（GB50011—2010）,提出抗震设计时应注意的几点看法。希望引起设计、施工、监理及开发商等建筑界同仁对抗震构造的高度重视,把抗震构造实实在在地运用到工程建设的各个环节。     

砖混结构房屋抗震设防策略分析

本文结合包头５．３地震震灾检查统计结果,论述砖混结构房屋的抗震减灾设防策略,由“抗”转变到“隔”的设防理论,讨论目前抗震设防中存在的问题,建议包头地区尽早推广应用基础隔震减震技术。     

低屈服点钢在建筑抗震设计中的应用

随着钢结构建筑抗震设计水平的进步,消能抗震设计已成为建筑抗震的一个发展方向.低屈服点、极低屈服点钢具有良好的塑韧性和低达100 MPa的屈服强度,并具有较狭窄的强度波动范围,而且成本低、易维护更换,在抗震阻尼构件的制造应用中具有显著的优势,从而成为建筑抗震材料中越来越受到重视的新钢种.介绍了抗震用低屈服点钢的性能要求及其作为抗震用钢的优点,同时还介绍了低屈服点钢的发展历史、现状及市场前景.     

alloy design,using second phases

Second phases are used widely in the design of alloys. The state of enlightenment in their use is reviewed. Attention is paid to a) processes to insert second phases, b) design of second phase morphology, and c) the use of second phases to control grain structure (size, orientation, shape) and dislocation networks. Optimization of design for strength, ductility and toughness, fatigue resistance, stress corrosion cracking resistance and fabricability is treated.     

赣州农村多层砌体房屋的抗震设计

通过对赣州农村建筑多层砌体结构的现状，提出有关抗震设计中应注意的问题。     

Seismic Response of FRP-Upgraded Exterior RC Beam-Column Joints

Shear failure of exterior beam-column joints is identified as the principal cause of collapse of many moment-resisting frame buildings during recent earthquakes. Effective and economical strengthening techniques to upgrade joint shear resistance and ductility in existing structures are needed. In this paper, efficiency and effectiveness of carbon fiber-reinforced polymer (CFRP) sheets in upgrading the shear strength and ductility of seismically deficient exterior beam-column joints have been studied. Four as-built joints were constructed with nonoptimal design parameters (inadequate joint shear strength with no transverse reinforcement) representing preseismic code design construction practice of joints and encompassing most of existing beam-column connections. Out of these four as-built specimens, two specimens were used as baseline specimens (control specimens) and other two were strengthened with CFRP sheets under two different schemes (strengthened specimens). In the first scheme, CFRP sheets were epoxy bonded to joint, beams, and part of the column regions. In the second scheme, however, sheets were epoxy bonded to joint region only but they were effectively prevented against any possible debonding through mechanical anchorages. All of these four subassemblages were subjected to cyclic lateral load histories so as to provide the equivalent of severe earthquake damage. The damaged control specimens were then repaired by filling their cracks through epoxy and externally bonding them with CFRP sheets under the same above two schemes. These repaired specimens were subjected to the similar cyclic lateral load history and their response histories were obtained. Response histories of control, repaired, and strengthened specimens were then compared. The results were compared through hysteretic loops, load-displacement envelopes, column profiles, joint shear distortion, ductility, and stiffness degradation. The comparison shows that CFRP sheets are very effective in improving shear resistance and deformation capacity of the exterior beam-column joints and delaying their stiffness degradation.     

Electron-beam deposition of chromium carbide–based coatings with an ultradispersed structure or a nanostructure

Coatings with an ultradispersed structure and a nanostructure, which have a high wear resistance, corrosion resistance, and a satisfactory ductility, are fabricated by electron-beam vacuum-free deposition of a powder mixture of chromium carbide, chromium, and titanium carbide using a relativistic electron accelerator. The increase in the wear resistance and the ductility is shown to be associated with the modifying influence of titanium carbide, which manifests itself in sharp structure refinement the presence of numerous nucleation centers in it in the form of disperse TiC precipitates.