{"title":"Shaking Table Tests of Underground Pipe with Connection Joints under Non-Uniform Earthquake Excitation","authors":"X. Ai, J. Li, J. Chen, H. Meng","doi":"10.1061/9780784413234.026","DOIUrl":"https://doi.org/10.1061/9780784413234.026","url":null,"abstract":"Shaking table tests of the underground cement pipe with connection joints under non-uniform excitation are investigated in this paper. In order to simulate the non-uniform earthquake excitation, different seismic waves with spatial correlation are applied to two tables along the axis of the pipe. The experimental results of the pipe joints displacement are presented in the paper. The experimental study could provide useful data for further pipe-soil interaction mechanism research and numerical analysis.","PeriodicalId":225611,"journal":{"name":"Lifeline Earthquake Engineering","volume":"504 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116379963","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}
{"title":"Seismic Assessment of Electric Power Transmission Concrete Beams","authors":"H. R. Vejdani-Noghreiyan, A. Shooshtari","doi":"10.1061/41050(357)31","DOIUrl":"https://doi.org/10.1061/41050(357)31","url":null,"abstract":"Reinforced concrete beams are widely used for transmitting electric power in urban environment in some countries like IRAN. In this paper, one kind of these RC beams are investigated and optimized. The available section can sustain lateral forces much more than necessary that’s why the need for optimizing the section seems essential. To achieve the optimized section, nonlinear programming is carried out by the use of analytical formulas from ACI. After that, the adequacy of the beam is checked by the use of pushover analysis. Finally, to obtain the actual behavior of the proposed sections, three specimens are constructed and tested. According to the provision for accepting these beams, a concentrated load should be exerted at the top of the beam and monotonically increases to obtain the pushover curve of the beam. Displacements at the top of the beam should not exceed certain values at different levels of load. Here, first of all, a new reinforcement arrangement is proposed for the beam based on nonlinear programming. After that, the adequacy of proposed reinforcement will be checked by the means of pushover analysis. Finally, three beams with proposed reinforcement arrangement are built and tested. The final results of all of the constructed beams satisfied the provisions, hence can be used in practice.","PeriodicalId":225611,"journal":{"name":"Lifeline Earthquake Engineering","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128047500","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}
{"title":"A Study of Shield Tunnel's Earthquake Prevention Under a Big Earthquake","authors":"K. Murakami, M. Nakano, Y. Horibe","doi":"10.3138/9781487583217-044","DOIUrl":"https://doi.org/10.3138/9781487583217-044","url":null,"abstract":"Currently, the most commonly used approach for determining the aseismicity of a shield tunnel is the 'Response Displacement Method.' This is based on analysed results of tests performed during an earthquake of magnitude equal to that indicated by the 'Criterion Utility Tunnel Design.' In addition for the following reasons this shield tunnel is also thoroughly checked for aseismicity using the 'Dynamic Analysis Method.' (1) As part of the Telecommunications Disaster Prevention Project in the Tokyo Metropolitan Area, this shield tunnel has been designed to maintain uninterrupted data transmission during natural disasters. (2) The natural crosses Class A rivers. During large earthquakes the structures along the river embankments are sometimes damaged. (3) The soil through which the shield tunnel drives changed from diluvial clay to sand. This reports on the results of studies performed to check the aseismicity of the shield tunnel under a large earthquake.","PeriodicalId":225611,"journal":{"name":"Lifeline Earthquake Engineering","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114955922","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}
{"title":"INFLUENCE OF RIGIDITY OF SOIL SURROUNDING SHIELD TUNNEL UPON EQUIVALENT RIGIDITY OF THE TUNNEL IN AXIAL DIRECTION","authors":"C. Tamura, T. Noguchi","doi":"10.11532/JOURNALTE1991.1.95","DOIUrl":"https://doi.org/10.11532/JOURNALTE1991.1.95","url":null,"abstract":"The purpose of this study is to investigate the interaction between ground surrounding a shield-driven tunnel and segments, especially their ring-joint portion. When a seismic force acts on an underground structure such as shield tunnel, the structure is influenced by the deformation of the ground surrounding the structure during the earthquake. In the analysis, the shield-driven tunnel is usually regarded, for simplifying the calculation, as a mechanically continuous tubular structure with uniform stiffness in the axial direction. This uniform stiffness is termed the equivalent rigidity. This paper describes a numerical simulation of the relation between mechanical properties of the ground and equivalent rigidities. From earthquake observations on real shield-driven tunnels, it has been noted that the ring-joints between segments open and shut during earthquakes, reducing the strain of the segments. A severe disturbance of the mechanical condition, that is, slip and crack, is supposed to occur at the ground just near the ring-joints. In the numerical simulation to study the disturbance, the finite element method is adopted, taking into account strain-dependence of rigidity of the soil, initial stress due to the dead load and the prestressing, and non-linearity of the spring of the ring-joint between segments. Furthermore, joint elements are set between segment and soil to represent slipping, and also on the cross section plane at the ring-joint point to represent cracks of the soil. The numerical simulation shows that the equivalent rigidity increases with the stiffness of grout, but it is influenced little by the strain level of the ground.","PeriodicalId":225611,"journal":{"name":"Lifeline Earthquake Engineering","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127796752","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}
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
