Twin lintel belt in steel for seismic strengthening of brick masonry buildings   总被引：2，自引：1，他引：1  

C.V.R.Murty JayantaDutta S.K.Agrawal 《地震工程与工程振动(英文版)》2004,3(2):215-222

A single-room, single-storey full-scale brick masonry building with precast RC roofing system was tested thric eunder displacement controlled lateral cyclic loading, to assess the effectiveness of the basic repair and seismic strengthening techniques. Initially, the virgin building specimen was loaded laterally to failure, In the second stage, the damaged building was repaired by stitching across the cracks, and tested under the same lateral loading. In the third stage, the twice-damaged structure was repaired once more by stitching and strengthened by twin lintel belt in steel and vertical corner reinforcement,and re-tested. The building strengthened by twin lintel belt in steel showed about 28% higher strength under lateral loading than the virgin building.  相似文献   

多层砌体房屋地震现场安全性鉴定子系统的研制与开发   总被引：2，自引：1，他引：1  

王东明  孙柏涛  杨德生 《地震工程与工程振动》2004,24(2):168-175

本文利用模糊综合评判原理研究了多层砌体房屋地震现场安全性鉴定方法,并以此为基础研制了多层砌体房屋地震现场安全性鉴定子系统。本文将该子系统运用到两个实际问题中,所得结论与专家基于经验的现场鉴定相吻合,初步验证了系统分析模块的可靠性。  相似文献   

Modelling the out‐of‐plane seismic behaviour of masonry walls by rigid elements     

Siro Casolo 《地震工程与结构动力学》2000,29(12):1797-1813

A computational model for evaluating the dynamical response and the damage of large masonry walls subjected to out‐of‐plane seismic actions is presented. During earthquakes, these actions are often the main cause of damage for the front wall and lateral walls of old masonry‐built churches and monuments. Since the crack patterns often tend to subdivide the plane walls into a number of blocks, the model assumes such walls as a series of quadrilateral plane rigid elements connected to each other in the middle of their adjoining sides. Only the out‐of‐plane displacements are considered, and the connections are regarded as spherical elasto‐plastic joints which allow rotations whose axis is in the plane of the undeformed wall. The hysteretic characteristics of these joints are defined so as to approximate the brittle behaviour of masonry material and the degradation due to cyclic loadings. The numerical results obtained using a limited number of elements show that the global out‐of‐plane response of the masonry walls and the mechanical degradation at each connection are in accord with the observed behaviour of real churches hit by strong earthquakes. Copyright © 2000 John Wiley & Sons, Ltd.  相似文献   

某大型水电枢纽坝基埋藏型岩溶发育特征及深层承压水研究   总被引：2，自引：0，他引：2  

钟辉亚  王思敬  顾钟平  董湘安  曾祥喜 《工程地质学报》1998,(2)

作者在现场工程地质勘察、试验基础上,对我国西南某大型水电枢纽坝基所遇特殊的复杂埋藏型岩溶、承压水问题进行了研究,弄清了坝基岩溶、承压水形成条件及发育特性,对坝址选择及工程处理的决策具有重要意义。  相似文献   

变形模量测试结果差异的分析          下载免费PDF全文

徐兵 《江苏地质》2008,32(2):141-143

地基土的变形模量是衡量地基土工程力学特性的一个重要指标,结合工程实例介绍了应用不同面积的承压板对同一点的地基土进行浅层平板载荷试验时,运用其测试结果计算得到地基土的变形模量并不一致,一般承压板的面积越大,变形模量值越小。分析了其中的原因,并提出了相应的解决办法。  相似文献   

混凝土多孔砖和组合配筋砖小截面墙体抗震性能的试验研究     

崔熙光  马晓寒  陈振涛 《世界地震工程》2008,24(1):116-121

针对农村窗间墙过窄的现状,提出一种组合配筋砌体以抵抗地震剪力,并提出混凝土多孔砖组合配筋砌体的参考公式.通过对混凝土多孔砖和组合配筋砖小截面墙体进行反复荷载下的抗震性能试验研究,讨论两种不同类型砌体的破坏特征、滞回特性、骨架曲线和抗剪强度等问题.组合配筋砌体与无筋砌体相比,抗震性能明显提高,延性增强.结果表明组合配筋砌体是一种能够明显改善小截面墙体抗震性能的实用方法,可在农村地区推广.  相似文献   

Shaking table tests and dynamic analyses of masonry wall buildings with frame-shear walls at lower stories   总被引：1，自引：0，他引：1  

David Xiong 《地震工程与工程振动(英文版)》2008,7(3):271-283

This paper describes shaking table tests of three eight-story building models： all are masonry structures in the upper stories, with or without frame-shear walls of one- or two- stories at the bottom. The test results of damage characteristics and seismic responses are provided and compared. Then, nonlinear response analyses are conducted to examine the reliability of the dynamic analysis. Finally, many nonlinear response analyses are performed and it is concluded that for relatively hard sites under a certain lateral stiffness ratio （i.e., the ratio of the stiffness of the lowest upper masonry story to that of the frame- shear wall story）, the masonry structure with one-story frame-shear wall at the bottom performs better than a structure built entirely of masonry, and a masonry structure with frame-shear wall of two stories performs better than with one-story frame- shear wall. In relatively soft soil conditions, all three structures have similar performane. In addition, some suggestions that could be helpful for design of masonry structures with ground story of frame-shear wall structure in seismic intensity region VII, such as the appropriate lateral stiffness ratio, shear force increase factor of the frame-shear wall story, and permissible maximum height of the building, are proposed.  相似文献   

岩溶裂隙中承压水紊流运动的解析研究   总被引：3，自引：2，他引：1  

王心义  韩星霞  刘白宙 《中国岩溶》2003,22(1):47-50

以断面代表点为研究对象,建立了描述单个岩溶裂隙承压水紊流运动的数学模型;利用Lagrange 法求解了不同定解条件下的数学模型,得到了相应的解析解;根据室内模拟实验资料验证了解析解,说明了所建模型的正确性及解析解的合理性,为复杂条件下溶岩裂隙水运动规律的研究奠定了基础。   相似文献   

非连续子母块体理论模型研究(Ⅱ):实例分析     

王士民  朱合华  蔡永昌 《岩土力学》2010,31(8):2383-2388

依据第Ⅰ部分所提出的非连续子母块体理论模型,应用Visual C++语言开发了基于Windows的面向对象的非连续子母块体计算分析模块。通过斜面滑块、两块体相互作用、悬臂梁端部受力等算例验证了所提出的非连续子母块体理论模型及所开发的计算分析模块的可行性与有效性。将开发的计算分析模块应用于石拱桥受极限荷载发生破坏失稳的工程实例中,通过与其他算法的计算结果进行对比讨论,证明了非连续子母块体理论模型在处理材料破坏问题方面的优越性。  相似文献   

多层砌体结构房屋设计要点及常见问题     

邓中亚 《中国勘察设计》2010,(3):55-57

多层砌体结构房屋由于其材料呈脆性的特点,抗震性能比较差。但由于其造价低,施工周期短,施工工艺简单,在我国中小城市的民用建筑和大部分农村建筑中仍普遍采用,因此,设计时仍须高度重视。只有掌握设计要点,妥善处理各环节的问题,才能切实提高设计质量。  相似文献