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为研究不锈钢槽式预埋组件在剪力作用下的破坏模式和承载性能，完成了3组9个带混凝土基材的不锈钢槽式预埋组件试件的受剪试验。试验结果表明，平行受剪工况下破坏模式为齿牙剪切破坏，垂直受剪工况下破坏模式为混凝土边缘破坏及槽道卷边受弯破坏。在试验的基础上，通过ABAQUS软件建立了有限元分析模型，并验证了模型的准确性。通过数值分析研究了齿牙尺寸、混凝土强度、边缘距离、锚件中心线间距及预埋槽道有效埋深等参数对极限承载力的影响。结果表明，平行受剪工况下，平齿型槽道的齿牙数量、宽度及厚度的增加均可提高极限承载力，齿牙高度对极限承载力影响较小；垂直受剪工况下，平齿型和燕尾型槽道的混凝土强度及边缘距离的增加均可提高极限承载力，而锚件中心线间距的增加则使极限承载力降低，预埋槽道有效深度对极限承载力影响较小。给出了不同破坏模式下的受剪承载力计算公式，通过试验结果与有限元模拟结果的对比，验证了承载力计算公式的有效性。

为研究部分包裹钢-混凝土组合轴压柱的整体稳定性能与设计方法，完成了两个试件的试验。利用有限元软件ABAQUS建立部分包裹钢-混凝土组合柱数值分析模型，并对比试验数据校核模型准确性。利用该数值模型进行参数分析，考虑材料强度、组合柱长细比、含钢率、纵筋和系杆的布置对该类轴压构件整体稳定性能的影响，分别获得不同因素影响下构件绕强轴和绕弱轴的极限承载力。结果表明，材料强度、系杆间距及含钢率对稳定性能的影响均较为显著，纵筋对轴压稳定性能的影响可以忽略。基于数值模拟结果，按照不同含钢率进行归类分析，拟合出稳定系数曲线，并考虑材料强度组合和系杆间距的影响，对稳定系数曲线进行修正，获得适用于PEC柱的轴压整体稳定系数计算方法。基于现行规范，引入可靠度指数，得到PEC柱截面承载力计算公式，进而提出适用于部分包裹钢-混凝土组合柱的轴压整体稳定设计方法。

为研究窄翼缘PEC中长柱轴压整体稳定性能，设计制作9根组合长细比介于76~141（正则化长细比介于0.84~1.55）的窄翼缘PEC中长柱，进行轴压整体稳定性能试验。研究窄翼缘PEC中长柱的初始弯曲、长细比、混凝土强度等因素对其破坏模式和轴压整体稳定承载力的影响。试验结果表明，窄翼缘PEC中长柱在轴压荷载下的破坏模式表现为绕弱轴的弯曲失稳，长细比和初始弯曲显著影响试件的破坏模式和极限承载力。当试件的正则化长细比大于1.0，初始弯曲大于L/1 000时，试件的破坏模式表现为整体极值点失稳；当试件的正则化长细比大于1.0，初始弯曲小于L/ 2 000时，试件的破坏模式表现为弹性平衡分岔失稳；当试件的正则化长细比小于1.0，初始弯曲小于L/2 000时，试件的破坏模式介于弹塑性极值点失稳和平衡点分岔失稳之间；初始弯曲一致时，试件的极限承载力随着长细比的增大迅速降低。采用ABAQUS有限元软件建立窄翼缘PEC中长柱有限元模型，将计算承载力与现行规范计算结果进行对比。结果表明，试件轴压整体稳定承载力比规范承载力高出20%，按现行规范计算整体稳定承载力时，没有充分考虑混凝土和型钢的协同作用，规范计算结果偏保守。

为了改善传统钢框筒结构抗震性能差和震后不易修复的缺陷，在裙梁跨中设置可更换双槽钢耗能梁段，提出含双槽钢腹板螺栓连接的钢框筒结构（SFT-WSL）。首先介绍了SFT-WSL构件的设计要点；然后根据结构的受力变形特点得到结构的滞回耗能修正系数，用以考虑双槽钢腹板螺栓连接变形的贡献，可用于基于性能的结构塑性设计；其后提出了结构的有限元建模方法，通过子结构试验结果验证了有限元模型的准确性；最后设计了一个30层的SFT-WSL算例，并对该结构算例进行了弹塑性分析和基于增量动力分析（IDA）的结构抗倒塌易损性分析。分析结果表明水平荷载作用下结构呈现出理想的延性破坏，结构能力曲线呈明显的三线形。多遇地震作用下，所有构件均保持弹性状态；罕遇地震作用下，耗能梁段屈服并充分发展塑性，耗散地震能量；极罕遇地震作用下，框架体系的裙梁进入塑性，保证结构不倒。结构算例的修正倒塌储备系数远大于允许值，表明设计的结构算例具有足够的抗倒塌能力储备。

为研究不锈钢槽式预埋组件在剪力作用下的破坏模式和承载性能，完成了3组9个带混凝土基材的不锈钢槽式预埋组件试件受剪试验。试验结果表明，平行受剪工况下破坏模式为齿牙剪切破坏，垂直受剪工况下破坏模式为混凝土边缘破坏及槽道卷边受弯破坏。在试验的基础上，通过ABAQUS软件建立了有限元分析模型，并验证了模型的准确性。通过数值分析研究了齿牙尺寸、混凝土强度、边缘距离、锚件中心线间距及预埋槽道有效埋深等参数对极限承载力的影响。结果表明，平行受剪工况下，平齿型槽道的齿牙个数、宽度及厚度的增加均可提高极限承载力，齿牙高度对极限承载力影响较小；垂直受剪工况下，平齿型和燕尾型槽道的混凝土强度及边缘距离的增加均可提高极限承载力，而锚件中心线间距的增加则降低极限承载力，预埋槽道有效深度对极限承载力影响较小。给出不同破坏模式下的受剪承载力计算公式，通过试验结果和有限元模拟结果进行对比，验证了承载力计算公式的有效性。

利用有限元软件ABAQUS模拟混合联肢部分外包组合剪力墙-钢连梁刚接节点在单调加载条件下的受力情况，并进行变参数有限元模拟。基于有限元模拟结果，研究该刚接节点的破坏模式，建立节点极限承载力的理论模型和计算公式。研究表明，混合联肢部分外包组合剪力墙-钢连梁刚接节点的极限承载力主要由以下5部分组成：节点核心区型钢腹板剪切强度、节点核心区翼缘框剪切强度、节点核心区内部混凝土斜压杆抗压强度、节点域范围内中间区格腹板剪切强度以及与钢连梁受拉翼缘相连的核心区型钢柱截面抗剪强度或与型钢柱受拉翼缘相连的中间区格腹板抗拉强度。结合变参数有限元模拟结果，验证了理论模型的可行性和承载力公式的准确性，可为混合联肢部分外包组合剪力墙-钢连梁刚接节点的承载力计算提供依据。

含可更换剪切型耗能梁段钢框筒利用位于裙梁跨中的耗能梁段集中塑性变形,有利于震后耗能梁段的替换和结构使用功能的快速恢复。为研究耗能梁段的构造对子结构和耗能梁段滞回性能的影响,基于某一30层原型结构的子结构,考察了耗能梁段长度、腹板高厚比、翼缘宽厚比、加劲肋间距、加劲肋单双面布置的影响。研究表明:随着耗能梁段长度的增加,子结构的承载力逐渐减小,耗能梁段的超强系数、塑性转角逐渐减小,建议耗能梁段的长度取柱距的(0.15～0.24)倍;随着腹板高厚比的增大,各子结构的承载力、累积耗能明显减小,耗能梁段的超强系数、塑性转角逐渐增大,极短型耗能梁段相比普通型耗能梁段对腹板高厚比的变化更为敏感;翼缘宽厚比的变化对子结构和耗能梁段性能的影响较小;当加劲肋间距超过限值,对极短型耗能梁段性能的影响较大,建议普通型耗能梁段的加劲肋间距可适当超过限值;极短型耗能梁段宜布置双面加劲肋,加劲肋单面布置时增加其厚度对子结构和耗能梁段性能的改善作用较小。

针对传统框筒结构延性差和震后修复困难的问题,提出了一种新型框筒结构形式——含可更换剪切型耗能梁段的组合钢框筒结构。为了体现这种结构的性能优势,利用SAP2000软件进行了静力弹塑性分析,将其与传统钢框筒结构(1个Q460钢框筒结构和2个Q345钢框筒结构)的承载力、层间位移角、楼层剪力、层刚度、剪力滞后效应、塑性铰分布和用钢量进行了对比,并给出一些设计建议。分析结果表明:该新型结构相对于Q345钢框筒结构可节省用钢量约15.5%;其翼缘框架剪力滞后效应与传统钢框筒结构相差不大;该新型结构的延性系数为1.73,相较于传统钢框筒结构的延性系数可提高26.3%;与传统钢框筒结构相比,该新型结构在中震和大震下可降低地震作用约20.1%和33.6%,并且将结构的塑性变形集中在可更换耗能梁段上,方便震后的识别和替换。在高烈度区,该新型结构的主体抗侧力构件钢材建议采用Q390～Q460,剪切型耗能梁段钢材建议采用LY160～Q345。

针对传统钢框筒结构地震耗能差、震后修复难度大和难以实现"强柱弱梁"的设计理念等问题,提出了一种新型高层钢结构体系——含可更换剪切型耗能梁段的高强钢框筒结构(HSS-FTS)。为研究耗能梁段布置方式对HSS-FTS抗震性能的影响,设计了30层的HSS-FTS系列算例并建立其有限元模型,依据提出的耗能梁段布置原则,给出了6种不同的耗能梁段布置方式。验证了有限元建模的合理性,对有限元模型分别进行反应谱分析、静力Pushover分析和动力弹塑性时程分析。分析结果表明:HSS-FTS改善了传统钢框筒结构的耗能能力,主要依靠耗能梁段塑性剪切变形耗散地震能量。不同的耗能梁段布置方式对结构的基底剪力、层间侧移角、承载能力、耗能能力、剪力滞后效应、塑性铰发展模式以及震后残余层间侧移角均有显著影响,但对结构的整体抗侧刚度影响较小。耗能梁段采用间隔布置3跨或连续布置5跨时,HSS-FTS在强震下的层间侧移角分布均匀,没有薄弱层出现,对震后残余层间侧移角的控制效果更为显著,且具有优良的耗能能力和理想的整体失效模式。

针对传统钢框筒结构地震耗能差和震后修复难度大等问题,结合剪切型耗能梁段耗能能力强及震后易修复、钢框筒抗侧刚度大、高强钢强度高且节约材料的优点,提出一种新型高层钢结构形式——含可更换剪切型耗能梁段的高强钢框筒结构(HSS-FTS)。给出了HSS-FTS的初步设计方法和耗能梁段的布置原则。为比较HSS-FTS和传统钢框筒结构(FTS)的抗震性能,采用SAP2000各建立了一个40层的HSS-FTS和FTS有限元模型,验证了有限元建模的合理性,分别对两个结构进行反应谱分析和动力弹塑性时程分析。结果表明:多遇地震下,HSS-FTS和FTS的层间位移角、基底剪力、楼层剪力和剪力滞后效应无显著差别,HSS-FTS可以满足抗震规范层间位移角的限值要求。罕遇地震和超大震作用下,HSS-FTS的柱轴力分布相比FTS更为均匀,减小了结构的剪力滞后效应,HSS-FTS的塑性铰主要集中在耗能梁段处,改变了FTS的塑性铰发展机制,具有理想的破坏模式。在罕遇地震和超大震作用下,HSS-FTS的层间位移角相比FTS分别降低了11.98%和13.63%,可有效减小震后结构的残余变形,降低耗能梁段的更换难度。HSS-FTS改变了FTS的耗能机制,在罕遇地震和超大震作用下,其耗能量相比FTS分别提高了86.58%和151.09%,其耗能能力显著提升,有效降低了结构的水平地震作用,可减轻除耗能梁段外的非耗能构件受损程度,此种新型高层钢结构形式更易于震后修复与功能的快速恢复。

地震作用下,传统钢框筒结构难以实现强柱弱梁的设计理念,大震下柱端往往先于梁端出现塑性铰。针对这一问题提出了含可更换剪切型耗能梁段的钢框筒结构,即在裙梁中设置可更换的剪切型耗能梁段,大震作用下结构利用剪切型耗能梁段良好的弹塑性变形能力进行耗能,其余构件仍处于弹性状态或部分发展塑性。设计了一组算例结构,包括传统钢框筒结构和含可更换剪切型耗能梁段的钢框筒结构,采用SAP2000有限元分析软件对算例结构进行了弹性和弹塑性地震反应分析,对比了传统钢框筒结构和不同耗能梁段布置形式的含可更换剪切型耗能梁段的钢框筒结构在多遇地震、罕遇地震和极罕遇地震作用下的抗震性能和破坏模式。结果表明:在裙梁中设置剪切型耗能梁段对结构整体刚度的影响较小,含可更换剪切型耗能梁段的钢框筒结构改变了传统钢框筒结构的耗能机制,主要通过耗能梁段的剪切变形代替裙梁端部塑性铰耗能。罕遇地震作用下耗能梁段全部进入塑性耗能,震后仅需替换损伤严重的耗能梁段即可快速恢复结构的使用功能。极罕遇地震作用下,传统钢框筒结构达到极限状态,而含可更换剪切型耗能梁段的钢框筒结构的耗能梁段进一步发展塑性,其余构件保持弹性,结构具有足够的安全储备。

等效实膜筒法较适合预估低烈度区钢框筒结构的构件尺寸,但当设防烈度较高时,预估出的构件尺寸偏小,需多次调整方可满足规范要求。针对该问题,提出了基于多遇地震作用下最大层间位移角与风荷载下最大层间位移角相等时多遇地震作用的相当风压概念,建议求顶点侧移时取相当风压与基本风压的较大值,可用《建筑抗震设计规范》中底部剪力法计算基底剪力的公式来估计相当风压下的基底剪力,通过多种影响因素分析验证了其可行性;此外在对多个钢框筒算例分析的基础上建议用等效实膜筒法时风荷载下的顶点侧移角限值可保守取1/450;最后用一个30层钢框筒算例验证了改进方法的有效性。改进后的等效实膜筒法对处于不同抗震设防区的钢框筒结构的构件尺寸预估均有较好的适用性。

为考虑横梁荷载下单层无侧移刚架的稳定承载力,首先采用转角位移法对横梁荷载下刚架稳定承载力进行分析,明确柱顶作用集中荷载与横梁作用均布荷载下的刚架稳定承载力相差很大。对横梁均布荷载下无侧移刚架的实用计算方法进行阐述,刚架需区分弱梁与弱柱刚架,前者采用梁柱易位法,后者采用传统的标准法确定柱计算长度系数。比较考虑二阶效应与实用计算方法所得柱计算长度系数,计算结果表明,考虑二阶效应将使柱计算长度系数偏于保守,横梁轴压力宜采用一阶分析。其次,采用有限元软件Abaqus分析两种典型无侧移刚架的屈曲性能,验证实用计算方法的正确性。最后,设计了96组算例对刚架类型的实用判别公式进行分析计算,并与有限元分析结果进行对比,验证了实用判别公式的正确性。

本文继上篇之后论述端部有侧移的压弯构件的面内等效弯矩系数。首先推导弹性悬臂构件等效弯矩系数的理论计算公式,包括自由端承载和杆内荷载的不同工况,并在此基础上推出近似计算公式。其次,用有限元方法计算悬臂压弯构件的弹塑性稳定承载力,并以此为基础对弹性分析的结果进行校验。校验表明弹性等效转换得到的公式可以可靠地应用。同时,还论证了公式可以应用于端部有转动约束的框架柱。最后讨论框架内力采用二阶分析时的柱的βm系数,指出《钢结构设计规范》(GB 50017-2003)的规定有所误解。

首先介绍了混合连肢墙体系的产生背景和特点,然后给出了该体系在整体结构和节点性能等方面的研究现状。在总结已有研究成果的基础上,指出了目前研究存在的不足和需要进一步解决的问题,并提出了一种新型钢梁柱焊接连接形式的混合连肢墙体系—含型钢边缘构件的混合连肢墙体系,具有构造简单、施工方便的特点。初步研究结果表明,该种新型连接形式滞回曲线饱满,强度和刚度退化缓慢,具有优良的抗震性能,是混合连肢墙体系值得研究的一个方面。最后给出了这种新型体系的研究内容和需要考虑的主要影响因素。

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Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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In order to research the seismic performance of high strength steel frames with Y-eccentric braces (Y-HSS-EBFs), the shake table test of a 1∶2 scaled 3-story Y-HSS-EBFs with redesigned links was carried out with El Centro wave, Taft wave and Lanzhou wave from frequent earthquake level of 7 degree intensity to rare earthquake level of 9 degree intensity．The dynamic properties, acceleration responses, displacement responses, strain responses and story shear force distribution, etc, were obtained from the test and compared with the pervious test results. The finite element model (FEM) of the test structure was established by ABAQUS and the numerical simulation of the test was carried out. The test results indicate that the structure is in elastic during the frequency earthquakes and only local damage appeares at the links. The lateral stiffness of the structure degrades obviously during the rare earthquakes but there is no dangerous collapse for the structure. The maximum inter-story drift ratio of the specimen during the frequent and rare earthquakes can meet the requirements on inter-story drift ratio limitation in the seismic design code of buildings. Links enter the plastic stage to dissipate earthquake energy while other structural members remain in elastic stage during rare earthquake. The results provided by the FE analysis show a good agreement with the test results. [ABSTRACT FROM AUTHOR]

In order to investigate the elasto-plastic story shear distribution of Y-type high strength steel composite eccentrically braced frame (Y-HSS-EBF), four Y-HSS-EBF models with different stories and global yield mechanism were established. Meanwhile, the finite element model of shaking table test specimen of Y-HSS-EBF was established and verified. The effects of story number, velocity pulse of near-fault motions and acceleration cumulative effect of far-fault motions were considered. Nonlinear time history analyses were conducted to obtain the story shear distribution of the structures during rare near-fault and far-fault earthquakes. The formula for calculating the elasto-plastic story shear distribution of Y-HSS-EBF was proposed based on equivalent base shear method in design code GB 50011-2010 'Code for seismic design of buildings' , and compared with other story shear distribution. Results indicate that the near-fault earthquakes with velocity pulse and far-fault earthquakes with acceleration cumulative effect have different effects on the story shear distribution of structures. The story shear distribution proposed in this paper is more accurate than other ones, and can be adopted for the performance-based plastic design method of Y-HSS-EBF. [ABSTRACT FROM AUTHOR]

In investigating the stability of frames, the load acted on the beam is usually concentrated on the top of the columns, which may cause considerable error for single-story non-sway frames. The present study aims at resolving practical calculation method in conformity with the actual behavior of the frames. The elastic stability of the frames is analyzed, revealing that the loss of stability occurs in an asymptotic mode. Owing to large deformation in the course of the instability, this critical load is unfit for determining the effective length of the column. The necessity of using second-order analysis for calculating the horizontal thrust is examined and the conclusion is negative. By analyzing two typical frames： weak-beam frame and weak-column frame, it is shown that conventional design approach, as adopted in design code, can be used for frames discussed herein, and one has only to take account of the influence of the horizontal thrust. The distinction between weak-beam and weak-column frames is emphasized, and the classification judgment formulas together with the 90° transposition approach for week-beam frames are presented. [ABSTRACT FROM AUTHOR]

The shake table test of a 1:2 scaled three-story high strength steel frame with Y-eccentric braces (Y-HSS-EBFs) was carried out to research the seismic performance of the structure, which can be applied to seismic design and application in seismic area of Y-HSS-EBFs. El Centro wave, Taft wave and Lanzhou wave were used in the test from frequent earthquake level of 7 degree intensity to rare earthquake level of 9 degree intensity. The dynamic properties, acceleration responses and displacement responses, etc, were obtained from the test. The result indicates that the stiffness of the structure degrades slightly during the frequent earthquakes and degrades obviously during the rare earthquakes. The shear deformation is the main deformation for the structure during the vibration process. The maximum inter-story drift of the structure is 1/869 during the frequent earthquakes and the maximum inter-story drift is 1/129 during the rare earthquakes, which meets the demands of inter-story drift limitation in the seismic design code of buildings. Y-HSS-EBFs have good seismic performance and can satisfy the ' three level ' seismic fortification requirements. At last, the inter-story horizontal seismic shear force obtained based on the equivalent base shear method is higher than that of the test result, which indicates that equivalent base shear method can be safely employed to calculate the seismic force of Y-HSS-EBFs. [ABSTRACT FROM AUTHOR]