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1.
预应力装配混凝土框架结构抗震性能研究 总被引：1，自引：0，他引：1
简要介绍了预制装配混凝土结构的发展现状,详细阐述了预应力装配式混凝土框架节点抗震性能研究的最新成果。预应力装配式节点的延性、变形恢复能力等性能优于现浇节点,附加适当的阻尼耗能措施后在高烈度地区同样具有良好的应用前景。 相似文献
2.
《浙江大学学报(A卷英文版)》2017,(6)
目的:装配式建造技术以其施工速度快和质量可靠等优点而被广泛采用。本文旨在探讨装配式钢板剪力墙-组合框架结构在不同地震烈度下的响应及失效模式,研究该结构体系的抗震性能,评估设计规范ASCE/SEI 7-10所推荐地震楼层剪力分布模式的合理性。创新点:1.通过伪动力试验,研究了装配式组合框架结构的抗震性能;2.分析了两边连接钢板剪力墙应用于装配式结构体系时的受力性能;3.评估了设计规范ASCE/SEI 7-10中地震楼层剪力分布的合理性。方法:1.通过开展不同地震烈度下的伪动力试验研究,分析装配式钢板剪力墙-组合框架的地震响应和失效模式;2.通过对比规范公式与试验数据,验证规范地震楼层剪力分布的合理性。结论:1.两边连接钢板剪力墙在较小的荷载下屈曲,通过屈曲后形成的拉力带抵抗水平荷载并屈服耗能;2.由可变梁高装配式钢框架节点拼装而成的装配式组合框架具有稳定的力学性能、良好的耗能能力以及足够的延性;3.本文所分析的装配式框架试件在大震下发生了组合梁严重开裂以及钢板剪力墙与组合梁之间螺栓连接冲切破坏的现象,应通过合理设计避免该破坏模式;4.设计规范ASCE/SEI 7-10所建议的公式可以合理地预测地震楼层剪力分布。 相似文献
3.
《浙江大学学报(A卷英文版)》2017,(12)
目的:提出一种震后功能可快速恢复的装配式中柱节点,并建立其设计理论;考察装配式中柱节点的抗震性能及震后修复性能,并提出设计建议。创新点:提出一种可快速恢复震后功能的装配式中柱节点;2.提出装配式中柱节点设计理论,并通过数值手段对其合理性进行校核;3.试验研究考察基础试件的抗震性能及震后修复性能。方法:1.通过理论分析手段建立装配式中柱节点设计理论;2.利用数值模拟手段通过4组8个算例来验证节点设计理论,并对节点抗震性能进行数值研究;3.对基础试件进行低周往复荷载试验研究及修复试验研究,进一步验证设计理论的合理性,并考察节点的抗震性能及震后修复性能。结论:1.提出的设计理论可准确地预测装配式中柱节点的屈服荷载;2.设计合理的装配式中柱节点具有良好的承载性能及滞回特性,可满足结构震后功能修复要求;3.翼缘连接盖板厚度和材性、中间螺栓间距和梁段间隙参数对节点抗震性能影响较大,需合理设置。 相似文献
4.
《长江工程职业技术学院学报》2020,(2)
对某框架结构教学楼移位工程进行了移位设计和现场检测的关键技术分析。该移位工程在现有柱下独立基础顶部采用现浇钢筋混凝土包裹式托换框架柱的设计方案,根据现浇钢筋混凝土包裹式托换节点与框架柱的接触面积,确定托换节点中托换梁截面尺寸。框架柱托换节点同时作为框架结构整体移位的上轨道,并采用连系梁和斜撑连接各托换节点。该教学楼移位后,其基础形式仍为现浇混凝土柱下独立基础,且部分新基础是在原有基础上采用加大既有独立基础底面积的设计方案,并在新加基础以下换填砂垫层以减小结构沉降。 相似文献
5.
《东南大学学报》2021,(3)
为研究新型装配式梁端削弱型节点的抗震性能,对4组不同削弱深度与厚度的拼接板耗能构件进行梁端循环加载试验,对比分析其滞回曲线、骨架曲线、承载力退化曲线、刚度退化曲线、延性及耗能能力等.试验结果表明,加载位移达到105 mm时,梁柱焊缝不出现脆性破坏.滞回曲线呈反S形,存在较明显的滑移现象,且主要发生于耗能板与梁翼缘连接处,产生原因在于耗能板螺栓直径略小于孔径.滑移现象的存在会导致骨架曲线没有明显的屈服点,节点延性系数小于3.0,初始转动刚度较小.耗能板屈曲是造成节点承载能力快速下降的主要因素,适当减小削弱深度、增加耗能板厚度可延缓屈曲现象的发生,提升节点的延性. 相似文献
6.
实际工程中的钢结构装配式施工,对施工荷载的分析和计算,所考虑的荷载形式较大部分是由各参与单位根据以往施工经验所归纳总结得出的荷载简化.然而,由于材料性能和施工荷载简化的形式与实际大不相符,实际工程中的钢结构预加应力的装配方式成为了较为常见的现象.对于带斜支撑的钢框架结构的装配式施工,如果对预加应力装配方式与作用在结构上的荷载形式与大小等方面考虑不足时,极易形成偏离实际的结构应力分布状态.本文中通过优先单元法建立了装配式钢框架结构的施工节点分析模型,控制框架柱竖向位移的同时,对斜支撑的施工作业顺序加以优化,最终得到了与设计的理想状态相近的结构受力状态,并实现了斜支撑的后期更换,保障了结构安全与耐久性,为日后类似工程的开展提供了借鉴依据. 相似文献
7.
为研究钢筋锈蚀后再生混凝土框架节点的破坏特征和抗震性能,对钢筋未锈蚀、锈蚀而保护层未开裂、平均锈胀裂缝宽度为0．2mm及平均锈胀裂缝宽度为0．4mm四种情况下的再生混凝土及普通混凝土框架边节点,进行了低周反复荷载对比试验;观察节点的受力过程及破坏形态,分析试件的荷载一位移滞回曲线、承载能力、强度和刚度退化、延性以及耗能能力等力学特性．结果表明：相同锈蚀程度下,再生混凝土节点的强度比普通混凝土节点小,再生混凝土节点的刚度退化比普通混凝土节点严重,再生混凝土节点表现出更好的延性,再生混凝土耗能较普通混凝土耗能弱;随着钢筋锈蚀程度的增加,再生混凝土与普通混凝土节点的强度降低,刚度减小,延性减小,耗能能力降低． 相似文献
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9.
新版《建筑抗震设计规范》GB5001-2010,加强了框架结构节点核心区截面抗震验算,自其实施以来,在PKPM(2010版)软件抗震验算过程中,尤其是高抗震设防烈度区,出现梁、柱节点域抗剪超限的问题时有发生,本文将结合个人在实际工程中做结构设计时的计算实例,与大家分享经验,浅析梁柱节点域抗剪超限的原理及解决方法,主要内容包括框架梁、柱节点域抗剪超限的含义解读;《建筑抗震设计规范》中关于节点核心区组合的剪力设计值的计算原理;《混凝土结构设计规范》GB50010-2010,框架梁、柱节点核心区的受剪承载力验算;以及个人在中国石油内蒙古销售公司八拜油库改扩建项目,综合办公楼结构设计中框架梁柱节点域抗剪超限解决的计算实例。 相似文献
10.
《赤峰学院学报(自然科学版)》2017,(16)
装配式建筑相较于传统的混凝土现浇建筑,具有整体性较差的特点,并由此引发了一系列问题,如墙板接缝处防水问题、钢筋混凝土结构以及钢结构的吊装出现问题、墙体注浆注意事项等.要确保装配式建筑工程施工质量,就必须对安装和使用过程进行控制,本文将结合万科某个装配式高层住宅项目为实例,对装配式建筑工程施工过程中几个易发问题的施工质量控制进行分析研究. 相似文献
11.
发展装配式建筑是促进传统建造方式转型升级的重要途径。装配式建筑成本控制是当前装配式建筑发展中关注的重点和热点。通过文献分析对比装配式混凝土建筑（PC建筑）和传统现浇建筑的成本的差异性,系统归纳了影响PC建筑成本的主要因素,分析降低PC建筑成本的措施和方法,提出我国PC建筑成本控制的建议。 相似文献
12.
针对结构物在地震作用下的灾害评估问题,提出了一种基于刚度退化概念的框架结构整体与层间损伤指标.该指标通过结构静力弹塑性分析方法进行计算,利用塑性铰考虑结构的地震损伤.同时,根据能力谱方法建立了该损伤指标与抗震设防等级的关系.然后,将建议指标应用于2个3层钢筋混凝土框架结构,并与其他损伤指标进行了对比.结果表明:建议的损伤指标偏于安全,且对静力弹塑性分析的水平荷载模式不敏感;层间损伤指标能够清晰地反映各楼层的损伤情况,从而判断薄弱层的位置.最后,通过统计分析给出了结构不同性能水准与损伤指标的对应关系,为基于性能的框架结构抗震评估提供参考. 相似文献
13.
The progressive collapse of steel frame structures under the blast load was investigated using LS-DYNA.The multi-material Eulerian and Lagrangian coupling algorithm was adopted.A fluid-structure coupling finite element model was established which consists of Lagrange element for simulating steel frame structures and concrete ground,multiple ALE element for simulating air and TNT explosive material.Numerical simulations of the blast pressure wave propagation,structural dynamic responses and deformation,and progressive collapse of a five-story steel frame structure in the event of an explosion near above ground were performed.The numerical analysis showed that the Lagrangian and Eulerian coupling algorithm gave good simulations of the shock wave propagation in the mediums and blast load effects on the structure.The columns subjected to blast load may collapse by shear yielding rather than by flexural deformation.The columns and joints of steel beam to column in the front steel frame structure generated enormous plastic deformation subjected to intensive blast waves,and columns lost carrying capacity,subsequently leading to the collapse of the whole structure.The approach coupling influence between structural deformation and fluid load well simulated the progressive collapse process of structures,and provided an effective tool for analyzing the collapse mechanism of the steel frame structure under blast load. 相似文献
14.
INTRODUCTION Steel framed structures are widely used in in-dustrial and commercial buildings. According to thedifferent lateral load resisting system, the steel framescan be mainly divided into four kinds (Fig.1a): themoment-resisting frame (MRF), concentricallybraced frame (CBF), eccentrically braced frame(EBF), and knee bracing frame (KBF). Fig.1b shows the difference in the lateral per-formances of the above frames that have similarstructural parameters. Although the MRF is an e… 相似文献
15.
LIU Tao ZhANG Zhi-mei XIE Li-min Department of Civil Engineering Shanghai University Shanghai China Shenzhen Laiyingda Industry Trade Co. Ltd Shenzhen China 《上海大学学报(英文版)》2000,(Z1)
1 IntroductionThe criterion and rellablllty of the st~turalaselsmlc design depends mainly on the acknowledgement about the seismic response and the damagemechanism of the structure Generally, there are threeapproaches through which the stfUctural aselsmlccapabllltles is studied The first is the Investigation ofthe real earthquake disaster, the second isexperimental research, the third is academic analysisThe practical aselsmlc capabllltles and the behaviorof damage can be found out through th… 相似文献
16.
The seismic behaviors of an integral concreting frame, a light steel storey-adding frame and a storeyadding frame strengthened with carbon fiber reinforced polymer(CFRP)were investigated under low-cycle and repeated load(scale 1∶3). The failure characteristics, hysteretic behavior, rigidity degeneracy, deflection ductility and energy-dissipation capacity of the three specimens were compared. The test results reveal that chemicallybonded rebar technique can meet the requirements of storey-adding engineering. The carrying capacity, the deflection ductility, the energy-dissipating capacity and seismic performance of the light steel storey-adding frame are higher than those of the integral concreting frame, and they are the highest in the storey-adding frame strengthened with CFRP. 相似文献
17.
In order to evaluate the seismic behavior of confined RC column-composite beam joints, five interior joints were tested under low cyclic reversed load. The weakening extent of flanges, the number of studs, and whether to reinforce weakened flanges were used as parameters in designing these five joints. Failure characteristics, hysteretic curves, skeleton curves, ductility, energy dissipation, strength degradation, and stiffness degradation were analyzed. The test results revealed that the steel beam flanges in the joints were equivalent to the tie rod. Weakened flanges resulted in poor seismic behavior; however, the seismic behavior could be improved by increasing studs and reinforcing weakened flanges. The joint steel plate hoops, equivalent to stirrups, did not yield when the maximum load was reached, but yielded when the failure load was reached for the joints with shear failure. Increasing stud-type joints and reinforcing flange-type joints ensured good seismic behavior and met project requirements. Based on the experimental results, the failure mechanism of the joints was discussed, and the shear capacity equations of the joints was presented. 相似文献
18.
A 1/10 scale model of reinforced conorete (R.C.) frame structure was tested on the 15t-shaking table of State Key
Laboratory, Tongji University. The structural prototype was a 10-storey office building that was damaged in the 1985 Mexico
major earthquake[1]. The original acceleration records in the earthquake were applied as the input waves In the test. The dynamical
test model was designed according to the general law of similarity, and the effect of the shortage of artificial quality was
considered. The model was carefully made of fine gravel concrete and galvanized iron wire. The damage of test model is in good
agreement with that of archetypal building in the experiment. 相似文献
19.
结合汶川地震震害调查报告会及对汶川地震中建筑物震害的资料研究,分析汶川地震中砌体、框架、砌体——钢筋混凝土混合结构3种结构体系的震害特点和震害原因,探讨这3种结构体系的抗震性能,总结了一些经验和教训,在此基础上,提出了建筑结构抗震设计中应注意的问题和改进建议,供实际工程设计参考。 相似文献
20.
Numerical Simulation of Dynamic Response and Collapse for Steel Frame Structures Subjected to Blast Load 总被引：4，自引：0，他引：4
The progressive collapse of steel frame structures under the blast load was investigated using LS-DYNA. The multi-material Eulerian and Lagrangian coupling algorithm was adopted. A flu-id-structure coupling finite element model was established which consists of Lagrange element for simulating steel frame structures and concrete ground, multiple ALE element for simulating air and TNT explosive material. Numerical simulations of the blast pressure wave propagation, struc-tural dynamic responses and deformation, and progressive collapse of a five-story steel frame structure in the event of an explosion near above ground were performed. The numerical analysis showed that the Lagrangian and Eulerian coupling algorithm gave good simulations of the shock wave propagation in the mediums and blast load effects on the structure. The columns subjected to blast load may collapse by shear yielding rather than by flexural deformation. The columns and joints of steel beam to column in the front steel frame structure generated enormous plastic defor-mation subjected to intensive blast waves, and columns lost carrying capacity, subsequently lead-ing to the collapse of the whole structure. The approach coupling influence between struc-tural deformation and fluid load well simulated the progressive collapse process of structures, and provided an effective tool for analyzing the collapse mechanism of the steel frame structure under blast load. 相似文献