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1.
低周反复荷载下高性能混凝土震损框架的抗震性能   总被引:1,自引:0,他引:1  
基于预应力与非预应力高性能混凝土震损框架的低周反复荷载试验,对其受力过程、破坏形态、滞回曲线、骨架曲线、恢复力模型、变形恢复能力、刚度退化、耗能能力等抗震性能进行较为深入的研究与分析。研究表明:高性能混凝土震损框架的抗震性能较震损前有明显的降低,但仍具有一定的抗震能力。  相似文献   

2.
高预应力度混凝土梁抗震性能探讨   总被引:2,自引:0,他引:2  
基于低周反复荷载试验,对高预应力度混凝土梁的受力过程、破坏形态、滞回曲线、骨架曲线、恢复力模型、变形恢复能力、延性、刚度退化等抗震性能进行了较深入的研究分析。研究表明:高预应力度混凝土梁具有优良的变形恢复能力以及较好的位移延性,总体上抗震性能较好。  相似文献   

3.
通过3个不同轴压比的预应力混凝土扁梁框架内节点试件的低周反复荷载加载试验,对节点的破坏形态、滞回曲线、延性、耗能能力以及刚度退化等抗震性能进行了初步研究,并着重探讨了轴压比对预应力混凝土扁梁框架内节点抗震性能的影响规律.  相似文献   

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通过4个预应力混凝土宽扁梁框架边节点在低周反复荷载作用下的抗震试验研究,对宽扁梁边节点在模拟地震作用下的破坏形态、特征荷载、滞回特性、骨架曲线、延性以及耗能能力等抗震性能进行分析研究。研究表明:试件初裂出现在靠近柱附近的梁,最终破坏区域发生在节点外核心区剪切破坏;荷载位移滞回曲线基本上呈梭形且相对饱满,试件位移延性系数介于3.7~5.13,具有较好的延性及耗能能力;穿过节点外核心区的预应力筋数量变化时,试件的延性及耗能能力变化不明显;试验中出现外核心区内的扁梁纵筋与混凝土黏结滑移破坏,混凝土剥落,而内核心区水平箍筋并未达到极限强度,建议在扁梁框架节点的设计应设置构造竖向垂直箍筋。总体上看,预应力混凝土宽扁梁框架边节点具有一定的抗震性能,可以通过合理的构造措施将其应用于抗震结构中。  相似文献   

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部分预应力混凝土扁梁框架节点的拟静力试验研究   总被引:4,自引:1,他引:4  
本文进行了四个部分预应力混凝土扁梁框架节点的拟静力试验研究。通过四个不同试件的试验研究分析了节点的变形能力、耗能能力、延性和刚度退化等抗震性能,同时分析了低周反复荷载作用下预应力混凝土框架节点的破坏机理。  相似文献   

6.
通过5根高强钢筋(500 MPa)高强混凝土(C60)预应力框架梁与1根非预应力框架梁的低周反复加载试验,研究了换算配筋率、预应力强度比、箍筋强度等参数对预应力框架梁抗震性能的影响。试验结果表明:随着换算配筋率的增加,预应力框架梁滞回曲线逐渐捏拢,承载力下降段变陡,延性性能和耗能能力降低;当换算配筋率为2.6%~3.1%时,位移延性系数均大于3.0;当换算配筋率为3.6%时,位移延性系数为2.82,延性稍差。但若采用高强箍筋替代普通箍筋,将改善预应力框架梁的延性性能和耗能能力,此时位移延性系数为3.36;在换算配筋率等其他因素相同的情况下,预应力强度比的提高并没有明显改变梁的抗震性能;非预应力梁的延性性能及耗能能力等抗震性能均要优于预应力梁。  相似文献   

7.
本文通过两榀框架梁按不同预应力度配置无粘结预应力盘和非预应力筋的“强柱弱梁”型无粘结部分预应力混凝土框架在水平低周反复荷载作用下的试验研究,探讨其包括裂缝分布、破坏形态。极限承载力、无粘结筋应力变化、位移延性、耗能能力、恢复力特性等工作性能,并进一步分析了影响此类结构抗震性能的主要因素,为无粘结部分预应力混凝土框架在地震设防区域的应用提供参考。  相似文献   

8.
利用地震振动台对大跨预应力混凝土井式梁空间框架结构的抗震性能进行了实验研究。两个模型的实验结果表明:(1)大跨预应力井式梁空间框架结构可以提供大的楼层平面内刚度;(2)对称大跨预应力井式梁空间框架结构,可以不考虑耦合地震反应;(3)大跨预应力井式梁空间框架结构的竖向地震反应中心大而周边小;(4)在相同加速度但不同的地震波作用下,结构的竖向地震反应不同。  相似文献   

9.
预制预应力混凝土装配整体式框架拟动力试验研究   总被引:6,自引:0,他引:6  
通过一榀二跨二层预压装配式预应力混凝土框架拟动力试验,研究了预压装配式框架的破坏机制、变形性能、刚度退化及耗能能力等抗震性能,并对模型结构进行弹塑性动力分析。研究表明,预压装配式预应力结构有着很强的变形恢复能力,框架节点处于双向受压状态,节点刚度和核心区抗裂性得到增强,提高了框架整体抗侧刚度。在竖向和水平力的作用下,梁端在叠加的负弯矩作用下率先出现塑性铰,可实现"强柱弱梁"的设计要求,预压装配式预应力结构具有良好的抗震性能。  相似文献   

10.
高强高性能混凝土剪力墙的研究现状及展望   总被引:2,自引:0,他引:2  
对国内外高强高性能混凝土剪力墙的研究现状进行了综述与分析,内容涉及高强高性能混凝土剪力墙的抗震性能试验、有限元分析理论、抗震设计方法和抗火研究等方面.重点阐述了轴压比、剪跨比、配筋率、混凝土强度等级等因素对高强高性能混凝土剪力墙力学性能的影响;同时,结合高强高性能混凝土剪力墙在实际工程中的应用情况,提出了一些亟待解决的问题.  相似文献   

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A procedure for short-term rainfall forecasting in real-time is developed and a study of the role of sampling on forecast ability is conducted. Ground level rainfall fields are forecasted using a stochastic space-time rainfall model in state-space form. Updating of the rainfall field in real-time is accomplished using a distributed parameter Kalman filter to optimally combine measurement information and forecast model estimates. The influence of sampling density on forecast accuracy is evaluated using a series of a simulated rainfall events generated with the same stochastic rainfall model. Sampling was conducted at five different network spatial densities. The results quantify the influence of sampling network density on real-time rainfall field forecasting. Statistical analyses of the rainfall field residuals illustrate improvement in one hour lead time forecasts at higher measurement densities.  相似文献   

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正This journal is established by the Institute of Engineering Mechanics(IEM),China Earthquake Administration,to promote scientific exchange between Chinese and foreign scientists and engineers so as to improve the theory and practice of earthquake hazards mitigation,preparedness,and recovery.To accomplish this purpose,the journal aims to attract a balanced number of papers between Chinese and  相似文献   

16.
Foreword     
Destructive earthquakes have caused great damage in China and the United States and collapsing buildings havecaused many deaths and injuries. The field of earthquake engineering studies earthquake hazards, the occurrence ofearthquakes of various magnitudes, the nature of the ground shaking during an earthquake, the vibration of structuresduring earthquakes, the strengthening of existing structures and the design of new structures to be earthquake resistant,and finally, how to cope with earthquake damage and restore a city to normal functioning. Such efforts are in progressin both countries, but unfortunately, the language barrier interferes with the free flow of information between China andthe Untied States. It would be mutually beneficial if some means could be developed to promote the exchangeof information across the Pacific Ocean. This new journal has been established for this purpose and its success willbe an important step in promoting earthquake engineering in China and the United States.  相似文献   

17.
正President:Giampaolo Di Silvio,Italy Vice Presidents:Ulrich C.E.Zanke,Germany Zhao-yin Wang,China The World Association for Sedimentation and Erosion Research(WASER),inaugurated on Oct.19,2004,is an independent non-governmental,non-profit organization.The mission of WASER is to promote international co-operation on the study  相似文献   

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Copyright     
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正Global Change includes climate change and other environmental changes caused by the joint interaction among various layers of Earth. From the positive side, global change provides new opportunities to human and other living forms on Earth. In the meantime, it creates tremendous challenges and negative impact. At present, the negative impacts have reached all primary processes of the global ecosystem and every aspect of human society, especially causing degradation of the ecosystem. For instance, intensive deforestation causes decline of biodiversity; global warming causes sea level rise and increases  相似文献   

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