较小剪跨比轻钢-尾砂微晶发泡板组合墙抗震性能试验     

曹万林  李浩  乔崎云  董宏英  边瑾靓 《地震工程与工程振动》2020,(1):80-87

提出了一种轻钢-尾砂微晶发泡板组合墙结构,首次进行了4个较小剪跨比轻钢-尾砂微晶发泡板组合墙试件的低周反复荷载试验,试件区分在于尾砂微晶发泡板强度、龙骨间是否填充砌块及有无拼接板缝。分析了各试件的强度、刚度、延性、滞回特性、耗能能力及破坏特征。研究结果表明:轻钢与尾砂微晶发泡板具有良好的共同工作性能;弹性阶段尾砂微晶发泡板呈剪切变形,且其变形发展受轻钢龙骨和镶嵌的分布钢筋制约;尾砂微晶发泡板强度可以明显提高结构的承载力;构件拼缝对结构的承载力有降低作用;轻钢龙骨间填充轻质砌块可显著提高其抗震性能。  相似文献   

多层钢管混凝土柱-铰接钢梁-混凝土核心筒结构振动台试验研究     

张鸿森  黄炎生  周靖 《地震工程与工程振动》2020,(2):227-238

验证研究新型多层钢管混凝土柱-铰接钢梁-混凝土核心筒结构的震损和反应特点。制作9层1/40的缩尺模型进行振动台测试,调查结构的震损特点、动力特性和地震反应。结果表明:震损出现在楼板与钢管混凝土柱、核心筒以及钢梁连接处的楼板上,震损破坏为变形引起的连接构造破坏和结构性破坏;自振周期随震损增加而增大,动力放大效应减小,侧向变形和层间位移显著增大;结构平均最大层间位移角超过规范框架-核心筒结构不倒塌限值的4.08倍而未出现倒塌;外排架抗扭刚度小,结构扭转反应由核心筒主导;相对于超高层结构,多层结构的剪重比显著增大,未出现因倾覆力矩过大而导致核心筒破坏的情况,较大层间位移角与损伤破坏的相关性提高。  相似文献   

不同支撑形式高强钢组合偏心支撑抗震性能研究          下载免费PDF全文

王峥  李慎 《世界地震工程》2020,(3):080-92

耗能梁段作为偏心支撑结构的耗能元件,在大震作用下通过弹塑性变形吸收地震能量,保护主体结构处于弹性受力状态。现行规范基于强度的设计理论,为了保证耗能梁段进入塑性或破坏,梁柱构件需要进行放大内力设计,导致截面过大,而且基于强度的设计方法很难保证结构的整体破坏状态。目前,抗震设计越来越重视基于性能的设计思想,该方法能够评估结构的弹塑性反应。对于高强钢组合偏心支撑,其中耗能梁段和支撑采用Q345钢,框架梁柱采用Q460或者Q690高强度钢材,高强钢不仅带来良好的经济效益,而且能够推广高强钢在抗震设防区的应用。利用基于性能设计方法设计了4种不同形式的高强钢组合偏心支撑钢框架,包括K形、Y形、V形和D形,考虑4层、8层、12层和16层的影响。通过Pushover分析和非线性时程分析评估该结构的抗震性能,研究结果表明:4种形式的高强钢组合偏心支撑钢框架具有类似的抗震性能,在罕遇地震作用下,几乎所有耗能梁段均参与耗能,而且层间侧移与耗能梁段转角沿高度分布较为均匀。其中:D形偏心支撑具有最大的抗侧刚度,但延性较差,而Y形偏心支撑的抗侧刚度最弱,但延性最佳。  相似文献   

考虑梁端耗能能力影响的钢框架结构易损性分析          下载免费PDF全文

徐强  谭维佳  李文阳  张子阳 《世界地震工程》2020,(3):109-115

一般采用梁柱焊接节点钢框架结构在遭遇强烈地震地震作用下,结构倒塌破坏可能由于是耗能能力不足所导致。以某钢框架结构为算例,选取20条实际地震动记录,对结构进行易损性分析,对比不同损伤指标和不同梁端构造形式的钢框架结构抗震性能差异。研究显示:对梁柱焊接的普通钢框架结构,其倒塌破坏是由于结构耗能能力不足所导致的,评价结构抗震性能不仅需考虑结构变形能力,尚需同时考虑结构耗能能力;对于改进形式的钢框架结构,结构耗能能力得到显著提高,使得位移首超破坏先于累积损伤破坏,此时基于变形的评价结果更加可靠。  相似文献   

框架-阻尼框筒结构附加阻尼比简化计算方法          下载免费PDF全文

徐自然 《世界地震工程》2020,(3):012-18

针对框架-阻尼框筒新型减震结构体系,考虑钢板阻尼墙屈服后强化和框架弹塑性,推导了结构附加阻尼比简化计算公式。以某框架-阻尼框筒结构为例,采用试验和有限元分析方法确定公式的参数取值,以此得到结构附加阻尼比的公式计算值,通过与结构动力弹塑性分析值进行对比,论证了简化计算公式的可用性。进一步基于参数分析给出了不同因素对公式计算值的影响。该简化计算方法为框架-阻尼框筒结构方案的快速设计提供了有效途径。  相似文献   

新型钢节点木构架-生土墙结构抗震性能拟静力试验研究          下载免费PDF全文

郭龙龙    袁康    裴城    王玉山   《世界地震工程》2019,35(4):060-67

针对我国村镇地区仍广泛存在生土结构房屋,且其结构整体性及抗震性能较差的现状,提出一种可有效提高其抗震性能、具有施工便捷性和装配属性的新型钢节点木构架-生土墙结构形式。进行了新型钢节点木构架-生土墙与农房中常见的素生土墙、上土坯下砖砌体混砌墙、传统榫接木构架-生土墙的拟静力对比试验,比较了4个墙体试件的破坏形态、滞回曲线和骨架曲线特征,以及延性系数、耗能能力、极限层间位移角等抗震性能指标。研究表明:素生土墙和上土坯下砖砌体混砌墙抗震性能较差,木构架的约束作用可有效提升生土墙的抗剪承载力和延性,新型钢节点连接的木构架-生土墙抗震性能优于榫接形式,具备一定的推广应用价值。  相似文献   

Residual structural capacity evaluation of steel moment‐resisting frames with dynamic‐strain‐based model updating method          下载免费PDF全文

Akiko Suzuki  Masahiro Kurata  Xiaohua Li  Shota Shimmoto 《地震工程与结构动力学》2017,46(11):1791-1810

This paper presents a method for evaluating the residual structural capacity of earthquake‐affected steel structures. The method first quantifies the damage severity of a beam by computing the dynamic‐strain‐based damage index. Next, the model used to analyze the structure is updated based on the damage index, to reflect the observed damage conditions. The residual structural capacity is then estimated in terms of changes in stiffness and strength, which can be applied by structural engineers, via a nonlinear static analysis of the updated model. The main contributions of this paper are in performance evaluation of the dynamic‐strain‐based damage index for seismically induced damage using a newly developed substructure testing environment, consideration of various damage patterns in composite beams, and extension of a local damage evaluation technique to a residual capacity estimation procedure by incorporating the model‐updating technique. In laboratory testing, the specimens were damaged quasi‐statically, and vibration tests were conducted as the damage proceeded. First, a bare steel beam–column connection was tested, and then a similar one with a floor slab was used for a more realistic case. The estimated residual structural capacities for these specimens were compared with the static test results. The results verified that the proposed method can provide fine estimates of the stiffness and strength deteriorations within 10% for the specimen without the floor slab and within 30% for that with the floor slab. Copyright © 2017 John Wiley & Sons, Ltd.  相似文献   

Shaking table tests on dome‐roof adobe houses          下载免费PDF全文

Ali Bakhshi  MohammadAli Ghannad  Mohammad Yekrangnia  Hamid Masaeli 《地震工程与结构动力学》2017,46(3):467-490

This paper presents the results of an experimental work in order to evaluate the performance of a novel proposed retrofitting technique on a typical dome‐roof adobe building by shaking table tests. For this purpose, two specimens, scaled 2:3, were subjected to a total of nine shaking table tests. The unretrofitted specimen, constructed by common practice, is designed to evaluate seismic performance and vulnerability of dome‐roof adobe houses. The retrofitted specimen, exactly duplicating the first specimen, is retrofitted based on the results obtained from unretrofitted specimen tests, and the improvement in seismic behavior of the structure is investigated. Zarand earthquake (2005) Chatrood Station is selected as the input ground motion that was applied consecutively at 25, 100, 125, 150 and 175% of the design‐level excitation. At 125% excitation level, the roof of the unretofitted specimen collapsed due to the walls' out‐of‐plane action and imbalanced forces. The retrofitting elements consist of eight horizontal steel rods drilled into the walls, passed through the specimen and bolted on the opposite wall surfaces. To improve walls in‐plane seismic performance, welded steel mesh without using mortar, covered less than half area of walls on the external face of the walls, is used. In addition to strain gauges for recording steel rod responses, several instrumentations including acceleration and displacement transducers are implemented to capture response time histories of different parts of the specimens. The corresponding full‐scaled retrofitted prototype tolerated peak acceleration of 0.62 g almost without any serious damage. Copyright © 2016 John Wiley & Sons, Ltd.  相似文献   

Rocking damage‐free steel column base with friction devices: design procedure and numerical evaluation          下载免费PDF全文

Fabio Freddi  Christoforos A. Dimopoulos  Theodore L. Karavasilis 《地震工程与结构动力学》2017,46(14):2281-2300

Earthquake‐resilient steel frames, such as self‐centering frames or frames with passive energy dissipation devices, have been extensively studied during the past decade, but little attention has been paid to their column bases. The paper presents a rocking damage‐free steel column base, which uses post‐tensioned high‐strength steel bars to control rocking behavior and friction devices to dissipate seismic energy. Contrary to conventional steel column bases, the rocking column base exhibits monotonic and cyclic moment–rotation behaviors that are easily described using simple analytical equations. Analytical equations are provided for different cases including structural limit states that involve yielding or loss of post‐tensioning in the post‐tensioned bars. A step‐by‐step design procedure is presented, which ensures damage‐free behavior, self‐centering capability, and adequate energy dissipation capacity for a predefined target rotation. A 3D nonlinear finite element (FE) model of the column base is developed in abaqus . The results of the FE simulations validate the accuracy of the moment–rotation analytical equations and demonstrate the efficiency of the design procedure. Moreover, a simplified model for the column base is developed in OpenSees . Comparisons among the OpenSees and abaqus models demonstrate the efficiency of the former and its adequacy to be used in nonlinear dynamic analysis. A prototype steel building is designed as a self‐centering moment‐resisting frame with conventional or rocking column bases. Nonlinear dynamic analyses show that the rocking column base fully protects the first story columns from yielding and eliminates the first story residual drift without any detrimental effect on peak interstory drifts. The study focuses on the 2D rocking motion and, thus, ignores 3D rocking effects such as biaxial bending deformations in the friction devices. The FE models, the analytical equations, and the design procedure will be updated and validated to cover 3D rocking motion effects after forthcoming experimental tests on the column base. Copyright © 2017 John Wiley & Sons, Ltd.  相似文献   

支座沉降对大跨度钢结构连廊地震受力性能影响分析          下载免费PDF全文

崔莉  吴海英 《地震工程学报》2019,41(2):319-325

在大跨度钢结构连廊的地震冲击影响分析中支座沉降都被忽略,而分析其受力情况对抗震性影响至关重要。研究支座沉降对大跨度钢结构连廊在地震中的受力性能变化,建立连廊结构在地震中的受力模型。做法为模型设定一个沉降量,计算支座沉降时,在地震冲击下连廊(包括钢框架和钢桁架)附加内力,再利用结构力学方法得到连廊附加弯矩图,得出沉降量对连廊钢框架地震冲击表达式,利用SAP2000软件分析不同沉降量下连廊钢桁架结构内力变化情况,得到连廊上、下弦杆在地震作用下的最大弯矩和最大轴拉力。实验结果表明,计算得到支座沉降后,连廊上弦杆和腹杆内动力系数最大值分别为0.17、0.15,比传统的时程分析法更接近相关规定值0.16,结果准确。  相似文献