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Effects of Vertical Irregularity in Steel Braced Frames on Response to Earthquake

Journal of Civil Engineering and Architecture 2018年第2期12卷 106-112页

作者： md.Mahmud Sazzad gazi md.sharfaraz imam azad md.Samdaniazad Niloy Samadder Department of Civil Engineering Rajshahi University of Engineering&TechnologyRajshahi6204Bangladesh Department of Civil&Environmental Engineering Faculty of EngineeringMahidol UniversityThailand China National Machinery Import&Export Corporation(CMC) Beijing100037China

This paper deals with the irregular profile of braced steel frame building in vertical direction with shear link bracing *** underlying fact of the paper is the effect of seismic force in braced frames with different types of irregularities including mass irregularity,mass discontinuity and overhanging *** each successive model,the position of shear link bracings has been fixed to make the study *** study has investigated the vulnerable effect of irregular profiles in steel frame *** attain the behavior of each frame,linear time history analysis method has been adopted for the present ***356 standard has been used here for linear time history *** on different frames exhibit that regular profile with symmetry in mass is more efficient while using overhanging mass is detrimental considering the time dependent displacements and accelerations.

关键词： Steel frame shear link time history analysis irregular profile.

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Geochemistry of Neogene Mudrocks from Sitakund Anticline, Bengal Basin: Implications for Provenance, Weathering, Tectonic Setting and Depositional Environment

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Journal of Geoscience and Environment Protection 2017年第6期5卷 147-171页

作者： md. Yousuf gazi S. M. Mainul Kabir md. Badrul imam Aminur Rahman md. Ashraful Islam Department of Geology University of Dhaka Dhaka Bangladesh Institute of Mining Mineralogy and Metallurgy Joypurhat Bangladesh

Geochemical analysis of Neogene mudrocks from Sitakund anticline, Chittagong Tripura Fold Belt (CTFB), Bengal Basin, Bangladesh, was deployed to delineate the provenance, tectonics and depositional environments. Representative samples went through mineralogical and geochemical analysis concerning major, trace and rare earth element analysis. Rigaku ZSX Primus and NITON XL3t 800 XRF instruments were utilized for the determination of major and trace elements. The experiment results reveal that the Neogene mudrocks are rich in silica having concentration of 58.10% to 62.60% with an average of 59.90%. Therefore, the geochemical response from the experiments apparently proved the existence of the active continental margin setting for the Neogene mudrocks. Different concentrations and ratios of major oxides satisfy that the mudrocks were derived from felsic source rocks. In addition, chemical index of alteration (CIA) values for the Neogene mudrocks vary from 67.81 to 77.57 with an average 74.41 indicating significant weathering at the source areas. Moreover, U/Th, Cu/Zn, Ni/Co and V/Cr ratios designate that the mudrocks were deposited in oxidizing depositional environment.

关键词： Geochemistry Neogene mudrocks Tectonic setting Provenance Weathering Depositional Environment Sitakund Anticline and Bengal Basin

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