基于CORS系统的GPS接收机检测技术   总被引：1，自引：0，他引：1  

朱丽强  陈中新 《测绘工程》2010,19(5):35-37

介绍GPS接收机检定的主要指标,提出在无GPS标准基线检验场的情况下,结合利用连续运行参考站和GPS参考接收机对不同类型的接收机联合进行检测的方法,对建立用户自助检测接收机的测试评估技术体系进行探索性研究。  相似文献   

元上都申遗1∶500地形图项目质量管理方法探讨   总被引：1，自引：1，他引：0  

陈艳 《北京测绘》2010,(3):39-41

遗址测绘在测绘行业属于新的业务领域,拓展新的业务领域是测绘发展的一个方向,在新领域内如何控制生产过程质量,实现项目的质量目标是值得探讨和研究的问题,本文介绍了元上都申遗1:500地形图测绘项目中全程控制的质量管理方法和内容,并对高程精度的检验方法做了具体的阐述。  相似文献   

基于可用性电子地图符号测试系统的设计与实现     

曹亚妮  江南  张薇  王驹 《测绘科学》2010,35(2):24-26

电子地图符号测试系统对提高电子地图符号的信息传输效率,与用户达成认知的一致性、准确性,促进电子地图符号的发展等都有重要的理论研究意义和实际应用价值。本文分析了现有电子地图符号测试系统中存在的问题,探讨了可用性理论在电子地图符号测试系统中的应用。最后,分别从功能设计、界面设计、测试项目设计、测试环境设计等四个方面研究了电子地图符号测试系统的设计方法,并用VC++语言对其编程实现。  相似文献   

轿子山大气视宁度测量     

李晓明  谢光中  卢汝为  王建诚  张有宏  李志  王汉平  李开华 《天文研究与技术》1994,(1)

本文介绍了轿子山大气视宁度观测的组织实施情况，给出了观测的结果。结果表明；在我们所观测的时间内（４月和５月），轿子山的视宁度是比较好的，在国际上也属上等。此外，我们的观测还表明，山顶的视宁度比半山腰好。因条件所限，其它月份没有得到观测资料，因此对轿子山全年的大气视宁度的情况无法下结论。但是，按照云南省的气象特征和过去的选址经验，４、５月是云南视宁度最差的季节，因此可以推断，轿子山的大气视宁度是比较好的。  相似文献   

煤层气井产出剖面测试技术及应用     

张雷  樊洪波  侯伟  张伟  郝帅  孙晓光 《吉林大学学报(地球科学版)》2020,50(2):617-626

现有常规油气井产出剖面测试方法在煤层气井中适应性较差,测试范围和测量工艺等存在局限性,施工成功率低。因此,本文对煤层气井产出剖面测试技术进行了整体的系统化设计和研发。通过紧凑的结构设计、高度集成,研发了一套可同时进行温度、压力、磁性定位、热式流量、探针持气率、微波持气、涡轮流量和超声流量等多参数测量的煤层气井测井仪,并研制了一套一次下井可进行多种测试技术测量的煤层气井产出剖面测试技术。同时提高了测试仪器的精度和抗干扰能力,开发了多任务多窗口的便携地面系统操作,并研制新型偏心测试井口应用于煤层气井,实现修井作业时不间断连续测试。该技术在鄂尔多斯盆地石楼北区块3口煤层气井进行了现场试验,取得精确、连续的测试数据。测试结果显示,石楼北区块8^#+9^#煤层为主力产气、产水层。  相似文献   

Damage localization and quantification of earthquake excited RC-frames     

P. S. Skjrbk  S. R. K. Nielsen  P. H. Kirkegaard  A. . akmak 《地震工程与结构动力学》1998,27(9):903-916

In the paper a recently proposed method for damage localization and quantification of RC-structures from response measurements is tested on experimental data. The method investigated requires at least one response measurement along the structures and the ground surface acceleration. Further, the two lowest time-varying eigenfrequencies of the structure must be identified. The data considered are sampled from a series of three RC-frame model tests performed at the structural laboratory at Aalborg University, Denmark during the autumn of 1996. The frames in the test series were exposed to two or three series of ground motions of increasing magnitude. After each of these runs the damage state of the frame was examined and each storey of the frame were classified into one of the following six classifications: undamaged, cracked, lightly damaged, damaged, severely damaged or collapse. During each of the ground motion events the storey accelerations were measured by accelerometers. After application of the last earthquake sequence to the structure the frames were cut into pieces and each of the beams and columns was statically tested and damage assessment was performed using the obtained stiffnesses. The damage in the storeys determined by the suggested method was then compared to the damage classification from the visual inspection as well as the static tests. It was found that especially in the cases where the damage is concentrated in a certain area of the structure a very good damage assessment is obtained using the suggested method. © 1998 John Wiley & Sons, Ltd.  相似文献   

Nonlinear dynamic tests of a reinforced concrete frame building at different damage levels     

Seyedsina Yousefianmoghadam  Mingming Song  Mohammad Ebrahim Mohammadi  Brittany Packard  Andreas Stavridis  Babak Moaveni  Richard L. Wood 《地震工程与结构动力学》2020,49(9):924-945

This paper discusses the dynamic tests of a two-story infilled reinforced concrete (RC) frame building using an eccentric-mass shaker. The building, located in El Centro, CA, was substantially damaged prior to the tests due to the seismic activity in the area. During the testing sequence, five infill walls were removed to introduce additional damage states and to investigate the changes in the dynamic properties and the nonlinear response of the building to the induced excitations. The accelerations and displacements of the structure under the forced and ambient vibrations were recorded through an array of sensors, while lidar scans were obtained to document the damage. The test data provide insight into the nonlinear response of an actual building and the change of its resonant frequencies and operational shapes due to varying damage levels and changes of the excitation amplitude, frequency, and orientation.  相似文献   

Loading protocols for experimental seismic qualification of members in conventional and emerging steel frames     

Cheng Fang  Yiwei Ping  Yiyi Chen 《地震工程与结构动力学》2020,49(2):155-174

Quasi-static testing is one of the most commonly used experimental methods for examining the seismic performance of structural members. However, consistent loading protocols for experimental seismic qualification of members in emerging steel frames such as self-centering braced frames (SCBFs) as well as in some conventional ones including buckling-restrained braced frames (BRBFs) are still lacking. This paper aims to propose standardized loading protocols based on time-history dynamic analysis on a series of prototype building frames, including steel SCBFs, BRBFs, and moment-resisting frames (MRFs), where both far-field and near-fault earthquakes are considered. The methodology for the development of the loading protocols involves ground motion selection and scaling, design and analysis of prototype buildings, analysis results processing, and rainflow cycle counting, together with extra justification steps. The proposed loading protocols are consistently derived based on the MCE-level seismic hazard and 84^th percentile values of key seismic demand parameters. These parameters are number of damaging cycles N_t, maximum inter-story drift θ_max, inter-story drift range Δθ_i, sum of inter-story drift range ΣΔθ_i, and residual inter-story drift θ_r. The analysis confirms the variations in these seismic demands imposed on the different structural systems under different types of ground motions, highlighting the necessity of developing separate loading protocols for the different cases. The assumptions, decisions, and judgments made during the development of the loading protocols are elaborated, and the conditions and restrictions are outlined. The rationality of the proposed loading protocols is further justified through demonstrating the cumulative distribution function and energy dissipation demand of the systems.  相似文献   

Experimental investigation of seismic behaviour of the ancient Protiron monument model     

Željana Nikolić  Lidija Krstevska  Pavao Marović  Hrvoje Smoljanović 《地震工程与结构动力学》2019,48(6):573-593

Throughout history, dry-stone masonry structures have been strengthened with different types of metal connectors in order to increase their resistance which enabled their survival, especially in the seismically active area. One such example is the ancient Protiron monument placed in the Peristyle square of the Diocletian's Palace in Split, Croatia. The Protiron was built at the turn of the 3rd century as a stone masonry structure with dowels embedded between its base, columns, capitals and broad gable. The stone blocks in the broad gable were connected by metal clamps during restoration at the beginning of the 20th century. In order to study the seismic performance of the strengthened stone masonry structures, an experimental investigation of seismic behaviour of a physical model of the Protiron was performed on the shaking table. The model was designed as a true replica model in a length scale of 1:4 and exposed to representative earthquake with increasing intensities up to collapse. The tests provided a clear insight into system behaviour, damage mechanism and failure under intensive seismic load, especially into the efficiency of connecting elements, which had a special role in increasing seismic resistance and protection of the structure from collapse. Additionally, this experiment provided valuable data for verification and calibration of numerical models for strengthened stone masonry structures.  相似文献   

Development of detachable replaceable links for eccentrically braced frames     

Mehmet Bakır Bozkurt  Sina Kazemzadeh Azad  Cem Topkaya 《地震工程与结构动力学》2019,48(10):1134-1155

Eccentrically braced frames (EBFs) can be repaired after a major earthquake by replacing the links. The link replacement is not a straightforward process and is influenced by the type of the link and the amount of residual frame deformations. The past decade has witnessed the development of different types of replaceable links such as end-plated links, web connected links, bolted flange and web spliced links, and collector beam and brace spliced links. All of the developed replaceable link details, except the web connected links, are not suitable for link replacement under residual frame drift. In this paper, a detachable replaceable link detail which is based on splicing the link at its mid-length is proposed. The detail is well suited for installation under residual frame drifts. In addition, the weight and size of the members to be transported and erected are reduced significantly, thereby facilitating the replacement procedure. Performance of this proposed replaceable link is studied by conducting six nearly full scale EBF tests under quasi-static cyclic loading. The link length ratio, type of end-plated mid-splice connection, and the amount of residual drift are considered as test variables. The test results revealed that the inelastic rotation capacity of the detachable replaceable links exceeds the requirements of the AISC Seismic Provisions for Structural Steel Buildings. No failures are observed in the end-plated mid-splice connections demonstrating the potential of the proposed details. The detachable replaceable links are investigated by numerical analysis as well to further validate their applicability and to develop design recommendations.  相似文献