纤维砂浆带加固砌体墙片的抗震性能研究     

杜永峰  朱翔  耿继芳 《地震工程与工程振动》2012,32(3):99-103

针对低烈度区砌体结构房屋抗震的需要,本文提出利用纤维砂浆带加固砌体墙的一种廉价抗震方案。运用有限元分析软件Ansys10.0进行数值模拟分析,探讨这种加固方案的可行性,并在此基础上进行试验研究。通过纤维砂浆带加固砌体墙片在低周反复荷载作用下的试验,对墙片的破坏特征、裂缝的发展过程、滞回特性、结构延性等技术指标进行对比分析,结果表明,采用纤维砂浆带加固砌体墙有助于提高墙体的开裂荷载,增加结构的延性,改善墙体的抗震性能。  相似文献   

带窗洞的加气混凝土砌块砌体墙抗震性能分析     

吴会阁  赵均 《世界地震工程》2012,28(1):33-38

为了研究设窗洞的蒸压加气混凝土砌块砌体承重墙的抗震性能,运用ABAQUS有限元分析软件对其进行了非线性分析。首先将有限元模型的计算结果与足尺试件的试验结果进行了对比验证,在此基础上,通过改变墙体的竖向压应力、水平配筋和开洞大小,研究了这些参数对墙体抗震性能的影响。研究表明:随着竖向压应力的增大,墙体水平承载力提高,而极限变形能力则有降低趋势;水平配筋可以提高墙体的承载力和变形性能;增大洞口水平尺寸导致极限承载力明显降低,而对其相应位移的影响则小得多。  相似文献   

Simulation of masonry out‐of‐plane failure modes by multi‐body dynamics          下载免费PDF全文

Alexandre A. Costa  Andrea Penna  António Arêde  Aníbal Costa 《地震工程与结构动力学》2015,44(14):2529-2549

The seismic assessment of the local failure modes in existing masonry buildings is currently based on the identification of the so‐called local mechanisms, often associated with the out‐of‐plane wall behavior, whose stability is evaluated by static force‐based approaches and, more recently, by some displacement‐based proposals. Local mechanisms consist of kinematic chains of masonry portions, often regarded as rigid bodies, with geometric nonlinearity and concentrated nonlinearity in predefined contact regions (unilateral no‐tension behavior, possible sliding with friction). In this work, the dynamic behavior of local mechanisms is simulated through multi‐body dynamics, to obtain the nonlinear response with efficient time history analyses that directly take into account the characteristics of the ground motion. The amplification/filtering effects of the structure are considered within the input motion. The proposed approach is validated with experimental results of two full‐scale shaking‐table tests on stone masonry buildings: a sacco‐stone masonry façade tested at Laboratório Nacional de Engenharia Civil and a two‐storey double‐leaf masonry building tested at European Centre for Training and Research in Earthquake Engineering (EUCENTRE). Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   

甘肃永登龙泉第三系锶型承压矿泉水分布特征与成因探讨   总被引：1，自引：0，他引：1       下载免费PDF全文

魏荣道  姚宝贵 《甘肃地质》2005,14(1):86-89,95

本文就永登龙泉第三系锶型承压矿泉水的产出条件、分布特征进行了概述,着重对其形成的地质条件和水文地质条件进行了分析,对锶型矿泉水的成因进行了探讨,为寻找同类型矿泉水具有一定借鉴意义  相似文献   

关于《建筑工程抗震性态设计通则(试用)》的讨论     

王焕定 《地震工程与工程振动》2005,25(5):186-188

本文是一篇关于《建筑工程抗震性态设计通则（试用）》的讨论,主要针对第3、5、10和第11章的内容,将通则与现行抗震设计规范进行了对比,并就所涉及的方面提了一些建议。  相似文献   

Interaction of coal and oil in confined pyrolysis experiments: Insight from the yield and composition of gas hydrocarbons     

《Marine and Petroleum Geology》2013

Isothermal pyrolysis experiments were performed for coal alone, oil alone and coal plus oil with oil/coal ratios ranging from 0.0065 to 0.1995 at 305 °C and 50 MPa for 72 h in confined systems (gold capsules). The results of these experiments reveal the interaction between coal and oil, demonstrating that oil retards the generation of gas hydrocarbons from coal cracking while coal accelerates oil cracking into gas hydrocarbons. The yields of gas hydrocarbons vary greater with oil/coal ratio in the experiments of coal B plus oil than coal A plus oil because coal A has a higher HI value than does coal B. Oil cracking rate could increase by up to 10 or even higher times in the experiments of coal plus oil compared with oil alone, deduced from the yields and chemical compositions of gas hydrocarbons. This result suggests that gas hydrocarbons, especially wet gases were largely generated from the cracking of oil or extractable bitumen in the experiments of coal plus oil with oil/coal ratio higher than 0.1.  相似文献   

平原承压水源论证模型及安全取水趋势研究     

张桂英  刘光  马冰  叶强 《地下水》2009,31(3):32-35

随着国民经济的发展,大部分地区水资源紧缺状况逐步加剧,供需矛盾日益突出,对深层承压水的开发力度逐步加大,易形成区域性降落漏斗,而压力水位和开采量之间的关系可以通过水均衡原理,结合地下水的渗流公式建立计算模型.以建设项目区实例为依据,对区域深层承压水源地论证模型、安全取水和水位预测趋势做了详尽的分析,对承压水的参数进行了系统的研究,对区域深层承压水的论证提出了科学的方法,该模型对平原地区承压水论证具有普遍的适应性.  相似文献   

Comparing Loss Estimation with Observed Damage: A Study of the 1999 Kocaeli Earthquake in Turkey   总被引：4，自引：0，他引：4  

Robin Spence  Julian Bommer  Domenico del Re  Juliet Bird  Nuray Aydinoğlu  Shigeko Tabuchi 《Bulletin of Earthquake Engineering》2003,1(1):83-113

Loss estimation from future earthquakes is of growing importance in planning earthquake protection strategies in high-risk areas. Loss models based on the spectral displacement approach are now widely used because of generally acknowledged deficiencies in earlier approaches using macroseismic intensity or peak ground-motion parameters. However, there has been to date rather little earthquake damage data by which the new generation of models can be assessed and which can be used to calibrate the parameters involved. The availability of several detailed damage surveys carried out following the 1999 Kocaeli earthquake in Turkey, provides a rare opportunity for such an assessment. In this paper the losses which would be predicted from two different approaches to loss assessment – one using predicted macroseismic intensity, the other using the spectral displacement method – are compared with actual observed losses in the Kocaeli event at two different locations where surveys were carried out. One of these sites was very close to the surface fault rupture (< 3 km distance), the other at a distance of about 4.5 km. It is shown that the predictive methods available generally overestimated the losses at these distances, and a number of possible reasons for these discrepancies are considered. The sensitivity of loss estimates to variations in the key parameters governing the estimation in each case are explored, in particular with respect to modifications in the parameters of the attenuation relationships and the vulnerability parameters. The implications of these results for estimating future losses are discussed. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

Seismic Vulnerability Assessment of Gravity Load Designed R/C Frames     

Angelo Masi 《Bulletin of Earthquake Engineering》2003,1(3):371-395

The seismic vulnerability of some frame structures, typical of existing Reinforced Concrete buildings designed only to vertical loads, has been evaluated. They are representative of building types widely present in the Italian building stock of the last 30 years. A simulated design of the structures has been made with reference to the codes in force, the available handbooks and the current practice at the time of construction. The seismic response is calculated through non linear dynamic analyses with artificial and natural accelerograms. Three main types have been examined: bare frames, regularly infilled frames and pilotis frames. The results show a high vulnerability for the pilotis buildings: they can be assigned to the class B of the European Macroseismic Scale of 1998 (EMS98). On the contrary, a low vulnerability (class D of EMS98) can be attributed to the regularly infilled buildings: in this case collapse can be considered unlikely also with strong earthquakes. An intermediate seismic behavior is shown by buildings without infills, whose vulnerability can be placed between the classes B and C of EMS98. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

配筋砌体结构地震易损性评价方法初探   总被引：5，自引：0，他引：5  

于德湖  王焕定 《地震工程与工程振动》2002,22(4):97-101

本文首先简要介绍了考虑空间协同的配筋砌体结构弹塑性地震反应分析程序EDAPSC；然后提出了一种利用空间协同时程分析结果，对配筋砌体结构地震易损性进行定量评价的方法，并以上海园南小区住宅楼为例进行了地震易损性分析，说明本文提出的地震易损性评价方法是可行和合理的；另外作者还对设计人员提出了提高结构抗震安全性的建议。  相似文献