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Seismic fragility of structures isolated by single concave sliding devices for different soil conditions

Earthquake Engineering and Engineering Vibration 2018年第4期17卷 869-891页

作者： P.Castaldo G.Amendola M.Ripani Department of Structural Geotechnical and Building Engineering (DISEG) Politecnico di Torino Turin Italy Department of Civil Engineering University of Salerno Via Giovanni Paolo H (SA) ltaly Universidad de Buenos Aires. Consejo Nacional de lnvestigaciones Cientificas y Tecnicas ( CONICET). Instituto de Tecnologias y Cieneias de la Ingenieria "Hilario Fernandez Long" (INTECIN). Faeultad de Ingenieria Buenos Aires Argentina

This study deals with the seismic fragility of elastic structural systems equipped with single concave sliding（friction pendulum system（FPS）） isolators considering different soil conditions. The behavior of these systems is analyzed by employing a two-degree-of-freedom model, whereas the FPS response is described by means of a velocity-dependent model. The uncertainty in the seismic inputs is taken into account by considering artificial seismic excitations modelled as timemodulated filtered Gaussian white noise random processes of different intensity within the power spectral density method. In particular, the filter parameters, which control the frequency content of the random excitations, are calibrated to describe stiff, medium and soft soil conditions. The sliding friction coefficient at large velocity is also considered as a random variable modelled through a uniform probability density function. Incremental dynamic analyses are developed in order to evaluate the probabilities of exceeding different limit states related to both the reinforced concrete（RC） superstructure and isolation level, defining the seismic fragility curves within an extensive parametric study carried out for different structural system properties and soil conditions. The abovementioned seismic fragility curves are useful to evaluate the seismic reliability of base-isolated elastic systems equipped with FPS and located in any site for any soil condition.

关键词： friction pendulum devices seismic isolation soil condition frequency content seismic fragility

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soil effect on the bearing capacity of a double-lining structure under internal water pressure

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2022年第11期23卷 863-881页

作者： Dong-mei ZHANG Xiang-hong BU Jian PANG Wen-ding ZHOU Yan JIANG Kai JIA Guang-hua YANG Department of Geotechnical Engineering Tongji UniversityShanghai 200092China Key Laboratory of Geotechnical and Underground Engineering of Minister of Education Tongji UniversityShanghai 200092China State Grid Tianjin Electric Power Company Construction Branch Tianjin 300143China Guangdong Research Institute of Water Resources and Hydropower Guangzhou 510610China School of Water Conservancy Engineering Zhengzhou UniversityZhengzhou 450001China

Water conveyance tunnels usually experience high internal water pressures and complex soil ***,shield tunnels with double-lining structure have been adopted because of their high bearing *** effect of the interface between the segmental and inner linings on the bearing capacity has been widely investigated;however,the effect of soil on the internal water pressure bearing capacity has not been emphasized ***,in this study,model tests and an analytical solution are presented to elucidate the effect of soil on the internal water pressure bearing ***,model tests are conducted on double-lining models under sandy soil and highly weathered argillaceous siltstone *** internal force and earth pressure under these different soil conditions are then compared to reveal the contribution of soil to the internal water pressure bearing *** this,an analytical solution,considering the soil–double-lining interaction,is proposed to further investigate the contribution of the *** analytical solution is verified with model *** analytical solution is in good agreement with the model test results and can be used to evaluate the mechanical behavior of the double-lining and soil *** effect of soil on the bearing capacity is found to be related with the elastic modulus of the soil and the deformation state of the *** the double-lining cracks,the sandy soil contributes 3.7%of the internal water pressure but the contribution of the soil rises to 10.4%when it is the highly weathered argillaceous *** the double-lining cracks,the soil plays an important role in bearing internal water *** soil contributions of sandy soil and highly weathered argillaceous siltstones are 10.5%and 27.8%,*** effect of soil should be considered in tunnel design with the internal water pressure.

关键词： Shield tunnel Double-lining Bearing capacity soil condition Internal water pressure

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维普期刊数据库

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SORPTION AND TRANSFORMATIONS OF ARSENITE AND ARSENATE IN soilS AND THEIR RELATION TO RICE GROWTH

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浙江大学学报(农业与生命科学版) 1988年第3期 105-112页

作者： Xie Zhengmiao( Department of soil Science and Agricultural Chemistry,Zhejiang Agricultural University,Hangzhou,China)

In the present paper,a series of laboratory,pot and field experiments was made to study the sorption and transformation of arsenite As(Ⅲ)and arsenate As(Ⅴboth in soils derived from 14 different parent materials and in various soil components as well as their relations between the sorption and transformation and rice growth,to elucidate the mechanisms of soil chemistry involved in the sorption and transformation of As(Ⅲ)and As(Ⅴ)by soils and soil *** comprehensive studies have provided some effective measures of protecting and reversing arsenic pollution in the soil *** results obtained are summarised as follows

关键词： arsenic sorptiort transformation pollution Oryza saliva L, paddy soil soil condition microorganism oxidation groundwater self-purifieation

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