预制+现浇装配式地铁地下车站结构地震反应的三维有限元分析          下载免费PDF全文

丁录董  徐军林  庄海洋  陈文斌 《世界地震工程》2021,(4):157-166

目前对装配式结构的抗震性能研究较少,尤其对装配式地下结构的抗震性能研究尤为缺乏。鉴于此,本文以实际新型预制装配+现浇钢筋混凝土箱型框架式地铁地下车站结构为研究对象,通过建立土-地连墙-装配式地下车站结构的二维和三维两种非线性整体有限元模型,分析了该类新型车站结构的整体抗震性能。结果表明:采用带肋梁预制装配板与现浇钢筋混凝土板的叠合楼板和钢管混凝土中柱的施工工艺能够明显增强结构抗震性能;同时发现二维有限元模型的计算结果高估了车站结构中柱顶底端的地震损伤程度,而低估了车站结构纵梁与中柱连接部位的地震损伤程度。在强地震作用下,建议采用土与地下结构非线性动力相互作用的三维有限元分析模型来真实反应车站结构中柱和纵梁的抗震性能。  相似文献   

新型预制楼盖的装配整体式框架剪力墙结构振动台试验研究   总被引：2，自引：0，他引：2  

郑先超  李青宁  潘树宾  姜维山 《地震工程与工程振动》2013,33(3)

基于发展装配式建筑是实现建筑节能的重要举措,从楼盖要满足平面内刚性的要求,结合实际工程进行了不加后浇面层的新型预制楼盖的中间钢板剪力墙边榀钢框架三层结构模型的振动台试验,并对采用新型预制板和新型连接的装配整体楼盖的面内变形、传递水平地震作用力的性能进行了分析.研究结果表明:采用新型预制板和新型连接的不加后浇面层楼盖的刚性可以保证结构的空间整体性和水平力的有效传递,在高烈度地区可以考虑用不加后浇面层的装配整体式楼盖代替现浇楼盖.  相似文献   

Newly developed technique and analysis solution to accelerate consolidation of ultrasoft soil     

Chen Geng  Shi Jiangwei  Chen Long 《Marine Georesources & Geotechnology》2017,35(2):292-299

Plastic vertical drainage is widely used in vacuum preloading for soft soil treatment. However, plastic vertical drainage has a number of disadvantages such as it only provides drainage paths in vertical directions and the distribution of soil strength is not uniform. A new technique, prefabricated vertical–horizontal drainage, was developed in this study to shorten the consolidation time of ultrasoft soil. Using one vertical drainage tube and four horizontal drainage tubes, prefabricated vertical–horizontal drainage provides drainage paths not only in vertical but also in horizontal directions. An analytical solution was derived to calculate the degree of soil consolidation when using the prefabricated vertical–horizontal drainage technique. Field tests were conducted to evaluate the effectiveness of prefabricated vertical–horizontal drainage and to verify the proposed analytical solution. It was found that consolidation time of soft clays using prefabricated vertical–horizontal drainage was 50% lower than plastic vertical drainage. Moreover, the average undrained shear strength of soil treated by the prefabricated vertical–horizontal drainage technique was approximately 30% larger than that treated by the plastic vertical drainage technique. The degree of soil consolidation estimated from the proposed analytical solution showed good agreement with field measurements. This implies that the proposed analytical solution can be used to directly estimate the degree of consolidation when the soil is treated by prefabricated vertical–horizontal drainage.  相似文献   

Improvement of very soft ground by a high-efficiency vacuum preloading method: A case study     

Gang Zheng  Jingjin Liu  M. S. Rahman  Zaikun Tan 《Marine Georesources & Geotechnology》2017,35(5):631-642

This paper describes a full-scale test on a very soft clay ground around 70,000?m², which is conducted in Huizhou of Guangdong Province, China, to present a new method of vacuum preloading method. A novel moisture separator was developed, which can automatically regulate the vacuum pressure variation by changing the volume of the gas inside it. A large quantity of water drained by the proposed moisture separators can be directly used as a surcharge loading, which would shorten the ground improvement time and save costs as well. Three levels of silt-prevention prefabricated vertical drains were used in the treating process to accelerate the consolidation. In addition, the vacuum preloading method also included an effective radial drainage device which would strengthen the dredged soft clay fill in a deep layer. In the in situ test, tens of piezometers and settlement plates were installed to measure the variations of excess pore water pressures and settlement of two stages of observation points at different positions in the ground. The results show that the largest average consolidation settlement was 314.1?cm and made a saving of more than 66% in power consumption compared with traditional method. It demonstrates that this adopted method is an efficient, cost-effective, and environmentally friendly method for improving sites with low bearing capacity and high compressibility soils.  相似文献   

灌浆套筒连接装配式剪力墙爆炸响应及参数分析          下载免费PDF全文

杜永峰  靳振飞 《世界地震工程》2020,(4):062-70

为了研究采用灌浆套筒连接装配式剪力墙结构的抗爆性能,应用显式动力分析软件LS-DYNA建立了现浇剪力墙和装配式剪力墙的有限元模型,对不同爆炸荷载下剪力墙的破坏形态和动态响应进行了模拟分析;扩充影响参数范围,进一步研究了墙体厚度和混凝土强度等级等因素对装配式剪力墙结构抗爆性能的影响。数值分析表明:对于装配式剪力墙,由于坐浆层处存在新旧混凝土的薄弱粘结面,爆炸作用下首先发生破坏,爆炸应力波聚集于坐浆层周围的墙体内部,导致局部发生脆性破坏;现浇剪力墙刚度分布比较均匀,爆炸作用下背爆面的混凝土首先被拉裂,最终发生弯曲破坏;增加墙体厚度、提高混凝土强度等级和改变炸药爆炸位置均可改善装配式剪力墙的抗爆性能。  相似文献   

新型钢筋搭接灌浆套筒节点力学性能试验及有限元分析          下载免费PDF全文

王宁  韩玉涛  苏幼坡  陈海彬  李德鑫 《世界地震工程》2019,35(1):128-137

对一种新型钢筋搭接灌浆套筒节点进行了力学性能试验研究和有限元分析。共设计了9组节点试件,变化的参数包括:搭接长度和钢筋直径、套筒壁厚和套筒端部约束方式。通过试验研究得出:套筒壁厚对灌浆料的约束作用较大,壁厚不宜小于5mm;套筒端部不做处理时节点的连接效果更好。基于试验结果采用ABAQUS软件进行了有限元补充分析,通过对比验证了有限元模型各个假设和本构模型取值的合理性。本研究以期为装配式混凝土结构的钢筋连接研究提供参考。  相似文献   

装配式剪力墙结构抗震试验研究          下载免费PDF全文

王文静    刘春原  苗玮  赵献辉  朱楠 《世界地震工程》2019,35(2):203-208

近年来我国各区域地震频发,房屋在地震中受损较为严重,如何提升房屋的抗震性是目前亟待解决的问题。以某市的装配式剪力墙高层住宅结构试点工程为试验对象,对其剪力墙结构进行设计改进,通过反复多次的荷载试验,分析其破坏受损过程,验证改进结构的抗震性能。试验结果表明:改进型的装配式剪力墙结构具有较好的抗震性能,应用推广前景良好。  相似文献   

CFRP加固对预制节段拼装桥墩抗震性能的影响          下载免费PDF全文

马煜  张于晔 《地震工程学报》2020,42(4):847-855

为提升预制节段拼装桥墩的抗震性能,采用碳纤维增强复合材料(CFRP)对预制节段拼装桥墩在地震中易损伤部位进行加固。基于既有试验,建立缩尺的预制节段拼装桥墩三维实体有限元模型,分析预制节段拼装桥墩在循环往复荷载情况下的恢复力特性以及破坏情况。分别采用箍筋加密和外包CFRP布对预制节段拼装桥墩底部节段进行加固,对比两种加固方式对预制节段拼装桥墩抗震性能的影响。研究结果表明,CFRP包裹桥墩底部节段能够增强桥墩整体刚度和承载能力,并且使得桥墩的刚度退化更加平缓,有利于预制节段拼装桥墩在地震作用下保持自身力学特性的稳定,确保桥梁整体的安全。  相似文献   

用高应变法确定预制桩承载力的拟合参数   总被引：1，自引：0，他引：1  

高炳鑫  陈翀  施健 《物探与化探》2010,34(1):123-126

采用高应变法确定预制桩承载力时,通过拟合得到的承载力具有多解性。因此提出了拟合参数的选取不一定要限定在规定的范围内,同时还 要根据预制桩设计参数、施工工艺或土体工程性质来选取拟合参数,解读高应变曲线,这样才能得到符合实际情况的预制桩承载力。  相似文献   

装配式圆钢管柱-钢梁节点抗震性能试验研究          下载免费PDF全文

刘伟  王俊平 《世界地震工程》2021,(1):041-47

为验证新型装配式圆钢管柱-钢梁节点的破坏模式及抗震性能,进行了3个十字形节点的低周反复循环加载试验。研究了不同试件节点的破坏模式、滞回性能、延性及耗能性能等。试验结果表明:试件的位移延性系数为3.38~3.44,能量耗散系数为1.72~2.25,节点具有良好的滞回性能、延性及耗能能力,满足现行规范设计要求。建议在采用新型装配式节点时,梁柱连接处可同时采用加强型连接或骨式连接,以获得良好的抗震性能。  相似文献