NED University Journal of Research最新文献_第2页

EXPERIMENTAL INVESTIGATION OF SEISMIC RESPONSE PARAMETERS OF RUBBERISED AGGREGATE CONCRETE FRAME STRUCTURE 橡胶骨料混凝土框架结构地震反应参数试验研究

NED University Journal of Research Pub Date : 2020-06-01 DOI: 10.35453/nedjr-stmech-2019-0021

H. Ullah, N. Ahmad, M. Rizwan, Izaz Ahmad

{"title":"EXPERIMENTAL INVESTIGATION OF SEISMIC RESPONSE PARAMETERS OF RUBBERISED AGGREGATE CONCRETE FRAME STRUCTURE","authors":"H. Ullah, N. Ahmad, M. Rizwan, Izaz Ahmad","doi":"10.35453/nedjr-stmech-2019-0021","DOIUrl":"https://doi.org/10.35453/nedjr-stmech-2019-0021","url":null,"abstract":"This paper presents the results of experimental investigations on a reduced-scale, reinforced, rubberised, aggregate concrete frame structure for the evaluation of seismic response parameters. The considered frame has twenty percent scrap-tyre rubber (crumb) replacing fine aggregates. A one-third reduced scale model of a two-storey single-bay frame was fabricated using the mix ratio of 1:1.68:1.72 (cement: sand: aggregate) and water/cement of 0.48, replacing twenty percent of fine aggregates via waste rubber (crumb) by volume. The model frame was subjected first to a free vibration test for evaluation of dynamic characteristics (frequency/period, elastic viscous damping). It was subjected to simulated multiple base excitations using 1994 Northridge earthquake time history for the evaluation of seismic response parameters (ductility factor, overstrength factor, and response modification factor). Seismic response curve (lateral displacement versus peak base acceleration) was developed for the model to assess the viability of crumb in concrete in areas of active seismicity. The fundamental period of vibration and damping were calculated as 0.75 sec and 10.85 percent, respectively using records of free vibration tests. The ductility, overstrength and response modification factors, and maximum acceleration resisted were computed using multiple base excitations which came out to be 3.10, 2.16, 6.70 and 0.72g, respectively.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132083219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

MATHEMATICAL PROPERTIES AND APPLICATIONS OF MINIMUM GUMBEL BURR DISTRIBUTION 最小甘伯尔毛刺分布的数学性质及应用

NED University Journal of Research Pub Date : 2020-03-01 DOI: 10.35453//nedjr-ascn-2018-0063

Farrukh Jamal, Hesham Reyad, S. Ahmed, Syed Muhammad Akbar Ali Shah

引用次数: 0

ANALYSIS OF LOCAL SITE EFFECTS ON SEISMIC RESPONSE OF FRAME STRUCTURES SUPPORTED BY FOUNDATIONS AT DIFFERENT ELEVATIONS 不同标高基础支撑框架结构地震反应的局部场地效应分析

NED University Journal of Research Pub Date : 2019-12-12 DOI: 10.35453/nedjr-stmech-2019-0038

Yangyang Tang, Yingmin Li, Zong-ming Huang, Liping Liu, Yishun Ding, Hui Zhu

{"title":"ANALYSIS OF LOCAL SITE EFFECTS ON SEISMIC RESPONSE OF FRAME STRUCTURES SUPPORTED BY FOUNDATIONS AT DIFFERENT ELEVATIONS","authors":"Yangyang Tang, Yingmin Li, Zong-ming Huang, Liping Liu, Yishun Ding, Hui Zhu","doi":"10.35453/nedjr-stmech-2019-0038","DOIUrl":"https://doi.org/10.35453/nedjr-stmech-2019-0038","url":null,"abstract":"Frame structures supported by foundations with different elevations (such as a structure on the slope) undergo different ground motions because of the local site effect. Seismic response of the structure under non-uniform excitation of ground motion is different from that under uniform excitation on upper embedding end or lower embedding end. Sites with the same height difference and different soil conditions were set up in this paper to subject them to ground motions related to different positions and the seismic response of structures built on the sites under uniform and non-uniform strong seismic excitation were compared. The results show that the predominant period and amplitude of ground motions on upper embedding end and lower embedding end are different and affected by soil conditions. The extent and law of amplification of shear force, displacement and storey drift of structures under non-uniform excitation differ from those under uniform excitation when soil changes from soft to medium-hard soil. In addition, the position and degree of plastic hinges change under non-uniform excitation compared to uniform excitation. The uniform excitation using the ground motion on the upper embedding end is not always safe for the frame structure supported by foundations at different elevations.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123504559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

ASSESSMENT OF SEISMIC PERFORMANCE OF SUBMERGED FLOATING TUNNEL UNDER MULTI-SUPPORT SEISMIC EXCITATIONS 多支点地震作用下水下浮式隧道抗震性能评价

NED University Journal of Research Pub Date : 2019-12-12 DOI: 10.35453/nedjr-stmech-2019-0025

Naik Muhammad, Saeed Ullah Jan Mandokhai, Zafar Baloch, Muhammad Habib, Shamsher Sadiq

{"title":"ASSESSMENT OF SEISMIC PERFORMANCE OF SUBMERGED FLOATING TUNNEL UNDER MULTI-SUPPORT SEISMIC EXCITATIONS","authors":"Naik Muhammad, Saeed Ullah Jan Mandokhai, Zafar Baloch, Muhammad Habib, Shamsher Sadiq","doi":"10.35453/nedjr-stmech-2019-0025","DOIUrl":"https://doi.org/10.35453/nedjr-stmech-2019-0025","url":null,"abstract":"Submerged floating tunnel (SFT) is an innovative structural solution for the transportation infrastructure through sea straits, fjords, and inland waters and is an economical alternative to the long-span cable-supported bridge, immersed tunnel, or underground tunnel. An SFT is a massive cylindrical structure that floats at a certain depth below the water surface and subjected to extreme environmental conditions, such as waves, tsunamis and earthquakes. The seismic assessment of SFT supported by mooring cables, under multi-support seismic excitations needs to be evaluated in more detail. The time domain dynamic problem of SFT moored by inclined mooring cables/anchors is formulated and the geometric non-linear dynamic analysis of SFT subjected to hydrodynamic and seismic excitations is performed in this paper. The prototype of SFT to be constructed in Qindao Lake of China is analysed under multi-support seismic excitations. It was found that due to the fluid environment and flexible cables the effective seismic forces are dissipated well and SFT is stable under the spectrum compatible ground motions. However, the lateral component of seismic excitations produce larger responses compared to longitudinal one and may be critical for other case studies.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123650886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

SEISMIC ISOLATION OF HOSPITALS IN PERU: A CASE STUDY WITH DRAFT PERUVIAN CODE 秘鲁医院抗震隔离:秘鲁法规草案案例研究

NED University Journal of Research Pub Date : 2019-12-12 DOI: 10.35453/nedjr-stmech-2019-0072

Joel Moscoso Tinco, Juan Alejandro Muñoz Pelaez

{"title":"SEISMIC ISOLATION OF HOSPITALS IN PERU: A CASE STUDY WITH DRAFT PERUVIAN CODE","authors":"Joel Moscoso Tinco, Juan Alejandro Muñoz Pelaez","doi":"10.35453/nedjr-stmech-2019-0072","DOIUrl":"https://doi.org/10.35453/nedjr-stmech-2019-0072","url":null,"abstract":"Seismic isolation is a seismic protection technique for buildings which has been recently introduced in Peru. More than twenty seismically isolated buildings exist in Peru, at present. Seismic isolators in many of these buildings have been designed using foreign codes developed for foreign seismic conditions in the absence of local design code. These conditions may not accurately represent Peruvian seismicity. The mandatory use of seismic isolators in new major hospital buildings has been established recently in the Peruvian seismic design code. Available studies in Peru indicate that most health centres may be temporarily affected after a rare seismic event. The seismic isolation Peruvian code is being developed taking into account the needs and implications of Peruvian seismicity. This paper presents the design procedure of the seismic isolation system of a representative four storey reinforced concrete hospital block. The requirements of the draft code for seismic isolation and the current seismic code have been used. The design process and verification show reasonable response of the structure in terms of drifts and acceleration even after including maximum and minimum modification factors of properties for the seismic isolation bearings.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117179278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

DESIGN AND ANALYSIS OF CONNECTION TYPES FOR ULTRA-HIGH-RISE TWIN-TOWER STRUCTURE LEARNING 超高层双塔结构连接型式设计与分析

NED University Journal of Research Pub Date : 2019-12-12 DOI: 10.35453/nedjr-stmech-2019-0039

Baolong Jiang, Shuyan Ji, Yingmin Li, Pu Yang, Yangyang Tang, Zhikun Chen

引用次数: 0

SEISMIC VULNERABILITY ASSESSMENT FOR SAN FRANCISCO TEMPLE IN MORELIA, MEXICO 墨西哥莫雷利亚市旧金山神庙地震易损性评估

NED University Journal of Research Pub Date : 2019-12-12 DOI: 10.35453/nedjr-stmech-2019-0071

G. Martinez, D. Castillo, J. Jara, B. Olmos

引用次数: 0

A SIMPLIFIED ANALYTICAL PROCEDURE FOR SEISMIC ANALYSIS OF TIMBER LIGHT-FRAME SHEAR WALLS 木结构轻框架剪力墙抗震分析的简化分析程序

NED University Journal of Research Pub Date : 2019-12-12 DOI: 10.35453/nedjr-stmech-2019-0054

G. Di Gangi, G. Monti, G. Quaranta, M. Vailati, C. Demartino

引用次数: 0

SEISMIC CAPACITY OF MEDIUM SIZE CONTINUOUS BRIDGES WITH LEAD-RUBBER BEARINGS 中型铅橡胶支座连续桥梁抗震性能研究

NED University Journal of Research Pub Date : 2019-12-12 DOI: 10.35453/nedjr-stmech-2019-0091

B. Olmos, J. Jara, J. Fabián

{"title":"SEISMIC CAPACITY OF MEDIUM SIZE CONTINUOUS BRIDGES WITH LEAD-RUBBER BEARINGS","authors":"B. Olmos, J. Jara, J. Fabián","doi":"10.35453/nedjr-stmech-2019-0091","DOIUrl":"https://doi.org/10.35453/nedjr-stmech-2019-0091","url":null,"abstract":"This paper investigates the effects of the nonlinear behaviour of isolation pads on the seismic capacity of bridges to identify the parameters of base isolation systems that can be used to improve seismic performance of bridges. A parametric study was conducted by designing a set of bridges for three different soil types and varying the number of spans, span lengths, and pier heights. The seismic responses (acceleration, displacement and pier seismic forces) were evaluated for two structural models. The first model corresponded to the bridges supported on elastomeric bearings with linear elastic behaviour and the second model simulated a base isolated bridge that accounts for the nonlinear behaviour of the system. The seismic demand was represented with a group of twelve real accelerograms recorded on the subduction zone on the Pacific Coast of Mexico. The nonlinear responses under different damage scenarios for the bridges included in the presented study were estimated. These results allow determining the seismic capacity of the bridges with and without base isolation. Results show clearly the importance of considering the nonlinear behaviour on the seismic performance of bridges and the influence of base isolation on the seismic vulnerability of medium size bridges.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"101 38","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131942684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

FINE-TUNING OF MODELLING STRATEGY TO SIMULATE THERMO-MECHANICAL BEHAVIOUR OF DOUBLE FRICTION PENDULUM SEISMIC ISOLATORS UST ESTIMATOR 双摩擦摆隔震器热-力学性能模拟策略的微调

NED University Journal of Research Pub Date : 2019-12-12 DOI: 10.35453/nedjr-stmech-2019-0058

V. Bianco, G. Monti, N. Belfiore

{"title":"FINE-TUNING OF MODELLING STRATEGY TO SIMULATE THERMO-MECHANICAL BEHAVIOUR OF DOUBLE FRICTION PENDULUM SEISMIC ISOLATORS UST ESTIMATOR","authors":"V. Bianco, G. Monti, N. Belfiore","doi":"10.35453/nedjr-stmech-2019-0058","DOIUrl":"https://doi.org/10.35453/nedjr-stmech-2019-0058","url":null,"abstract":"The use of friction pendulum devices has recently attracted the attention of both academic and professional engineers for the protection of structures in seismic areas. Although the effectiveness of these has been shown by the experimental testing carried out worldwide, many aspects still need to be investigated for further improvement and optimisation. A thermo-mechanical model of a double friction pendulum device (based on the most recent modelling techniques adopted in multibody dynamics) is presented in this paper. The proposed model is based on the observation that sliding may not take place as ideally as is indicated in the literature. On the contrary, the fulfilment of geometrical compatibility between the constitutive bodies (during an earthquake) suggests a very peculiar dynamic behaviour composed of a continuous alternation of sticking and slipping phases. The thermo-mechanical model of a double friction pendulum device (based on the most recent modelling techniques adopted in multibody dynamics) is presented. The process of fine-tuning of the selected modelling strategy (available to date) is also described.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115580066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1