新疆木垒县人民医院医技楼抗震鉴定     

王坚  谭明 《内陆地震》2010,24(3):221-226

对新疆维吾尔自治区木垒哈萨克自治县人民医院医技楼进行抗震鉴定工作,主要依据《GB50023-2009建筑抗震鉴定标准》开展。通过具体工作说明A类砌体房屋二级抗震鉴定的方法、过程、内容,以便类似工程借鉴。鉴定结果表明,木垒县人民医院医技楼房屋整体连接构造的可靠性和横墙间距不符合一级鉴定要求,因此在第二级鉴定中采用综合抗震能力指数的方法,最终得出该建筑物不满足鉴定标准要求的结论。该建筑物需要加固或采取其他维护措施达到抗震能力标准。  相似文献   

Seismic fragility of lightly reinforced concrete frames with masonry infills          下载免费PDF全文

Jong‐Su Jeon  Ji‐Hun Park  Reginald DesRoches 《地震工程与结构动力学》2015,44(11):1783-1803

Seismic fragility of lightly reinforced concrete frames with masonry infills is assessed through numerical simulations considering uncertainty in ground motion and building materials. To achieve this aim, a numerical model of the components is developed, a rational approach to proportion and locate individual struts in the equivalent three‐strut model is proposed, and an explicit nonlinear column shear response model accounting for the infill–column interaction and soft‐story mechanism is employed. The proposed numerical model is used to (1) generate probabilistic seismic demand models accounting for a wide range of ground motion intensities with different frequency content and (2) determine limit state models obtained from nonlinear pushover analysis and incremental dynamic analysis. Using the demand and limit state model, fragility curves for the masonry‐infilled frames are developed to investigate the impact of various infill properties on the frame vulnerability. It is observed that the beneficial effect of the masonry infill diminishes at more severe limit states because of the interaction with the boundary frame. In some cases, this effect almost vanishes or switches to an adverse effect beyond a threshold of ground motion intensities. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   

Out‐of‐plane strength reduction of unreinforced masonry walls because of in‐plane damages          下载免费PDF全文

Kiarash M. Dolatshahi  Mohammad Yekrangnia 《地震工程与结构动力学》2015,44(13):2157-2176

There are numerous studies on the behavior of Unreinforced Masonry (URM) walls in both in‐plane (IP) and out‐of‐plane (OP) directions; however, few aimed at understanding the simultaneous contribution of these intrinsic responses during earthquakes. Undoubtedly, even a strong URM wall shows weakened capacity in the OP direction because of minor cracks and other damages in the IP direction, and this capacity reduction has not yet been accounted for in seismic codes. In this study, performance of three URM walls is evaluated by several numerical analyses in terms of the OP capacity reduction because of IP displacements and failure modes. Several parameters influencing the OP capacity have been studied including aspect ratio, roof boundary condition, IP displacement and IP loading patterns. The results indicate that reduction in the OP capacity of URM walls varies from negligible to very high depending on boundary conditions, IP failure mode and IP damage severity. Moreover, IP loading pattern is more important in walls with higher aspect ratios because of their IP failure modes. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   

Comparison between rocking analysis and kinematic analysis for the dynamic out‐of‐plane behavior of masonry walls          下载免费PDF全文

Linda Giresini  Massimo Fragiacomo  Paulo B. Lourenço 《地震工程与结构动力学》2015,44(13):2359-2376

This paper provides a contribution to the rocking analysis of masonry walls by making a comparison with the kinematic analysis suggested by the Italian code. It is shown that the latter approach is generally over‐conservative and therefore potentially inappropriate for historic buildings, where rehabilitation can be expensive and can affect their cultural value. The equation of motion given by the Housner formulation, corresponding to the movement of a rigid block, is here modified to account for different boundary conditions at different heights of the wall. These boundary conditions or horizontal restraints can represent vaults, transverse walls, or retrofitting devices such as steel tie‐rods. A systemic analysis of walls having different dimensions and slenderness is performed, and the results from the Italian code and rocking analysis are compared. Finally, the improvement in the response offered by retrofitting devices is discussed in terms of reduction of amplitude ratio. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   

精细化纤维梁柱单元模拟分析平台FENAP的开发     

禚一  李忠献 《震灾防御技术》2010,5(2):242-247

为精细化模拟桥梁结构的非线性行为,在深入分析纤维梁柱单元模型原理的基础上,本文基于ABAQUS建立了钢筋混凝土精细化纤维梁柱单元模拟平台FENAP,开发了与其相适应的材料模型库FENAP/MAT,涵盖了多种材料本构模型,能够有效考虑构件的刚度退化和强度退化等损伤效应,以及模拟轴力和弯矩的多维耦合效应等复杂非线性动力行为,且可考虑箍筋对混凝土的约束作用等。利用该FENAP平台数值模拟了一个钢筋混凝土矩形截面悬臂梁,进行了Pushover分析,考虑了箍筋对核心混凝土约束效应的影响,并与OpenSEES的计算结果进行对比。结果表明:FENAP平台可有效模拟桥梁构件的多种复杂非线性行为,且具有很好的计算效率和求解精度。  相似文献   

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   

Influence of masonry infill panels on the vibration and stiffness characteristics of R/C frame buildings     

Amar A. Chaker  Arslan Cherifati 《地震工程与结构动力学》1999,28(9):1061-1065

Vibration measurements were performed on two adjacent, three-storey reinforced concrete frame buildings with hollow clay brick infill panels. The first building was a bare frame and the second one was a similar frame infilled with brick panels. The fundamental period for the infilled frame building was much smaller than that of the bare frame building. Using shear beam lumped mass models and the vibration data the actual lateral stiffness of both buildings was identified. The lateral stiffness of the infilled frame building was found to be seven times that of the bare frame building. Four numerical models of the infilled frame building were constructed. The frame and floors were represented using an experimentally validated model and the infill panels by one of three commonly used ‘equivalent diagonal truss’ models or by plane stress finite elements. Only the plane stress finite element model produced a reasonable agreement with the experimental results. Copyright © 1999 John Wiley & Sons, Ltd.  相似文献   

新型节能复合混凝土空心砌块砌体抗震性能的试验研究   总被引：2，自引：0，他引：2  

孙伟民  戴薇原  郭樟根  张怀金  张大长 《地震工程与工程振动》2006,26(5):136-143

本文通过2片开窗洞加窗台梁节能复合混凝土小型空心砌块墙体和2片不开窗洞墙体的水平低周反复荷载试验,研究了节能复合混凝土小型空心砌块砌体墙的受力全过程、开裂部位、裂缝发展情况以及破坏形态,分析了墙体的滞回特性、延性、耗能能力,刚度退化曲线等抗震性能,同时,考察了墙体外叶保护层的受力性能、破坏程度以及与墙体的共同工作机理,探讨了不同构造措施以及开窗洞对墙体抗震性能的影响。研究结果表明:复合混凝土小型砌块砌体从开始加载到最终破坏,砌块保护层都没有明显的鼓凸和脱落现象,说明聚苯层及横向拉结筋能够提供可靠的连接,保证外叶保护层在水平剪力和竖向荷载共同作用下和墙体整体工作,此外,开窗洞对墙体的抗震性能削弱较大。  相似文献   

Numerical study on factors that influence the in‐plane drift capacity of unreinforced masonry walls     

《地震工程与结构动力学》2018,47(6):1440-1459

Displacement‐based assessment procedures require as input reliable estimates of the deformation capacity of all structural elements. For unreinforced masonry (URM) walls, current design codes specify the in‐plane deformation capacity as empirical equations of interstory drift. National codes differ with regard to the parameters that are considered in these empirical drift capacity equations, but the inhomogeneity of datasets on URM wall tests renders it difficult to validate the hypotheses with the currently available experimental data. This paper contributes to the future development of such empirical relationships by investigating the sensitivity of the drift capacity to the shear span, the aspect ratio, the axial load ratio, and the size of the wall. For this purpose, finite element models of URM walls are developed in Abaqus/Explicit and validated against a set of experimental results. The results show that the axial load ratio, the shear span, and the wall size are among the factors that influence the drift capacity the most. Empirical equations are mainly derived from test results on small walls, and the numerical results suggest that this can lead to a significant overestimation of the drift capacity for larger walls.  相似文献