magiran.com: مجله آسيائي مهندسي عمران،

شماره جديد اين نشريه

سال دوازدهم
شماره 1
February 2011

راهنمای موضوعی نشريات

اين نشريه در گروه(های) زير قرار گرفته است:
1 مصوب فني و مهندسي
1 مهندسي عمران


	تبليغات



مجله آسيائي مهندسي عمران Asian journal of civil engineering فصلنامه فني، مهندسي داراي رتبه علمی - پژوهشی (فني مهندسي) به زبان انگليسي سال يازدهم، شماره 5، October 2010

	A Study of Endurance Time Method in the Analysis of Elastic Moment Frames under Three-Directional Seismic Loading V. Valamanesh ، H. Estekanchi Page 543 (انگليسي) Abstract مشاهده متن [PDF 1018KB]
	Endurance Time (ET) method is a time history based analysis procedure that applies special intensifying acceleration functions for estimating the seismic performance of structures at different excitation levels in each single analysis. One of the extensions of the ET method is in the seismic assessment of buildings considering multi-component excitation. In this paper، a procedure for three-directional seismic analysis of buildings is proposed and application of this method to several steel moment frames is investigated. Several Steel Moment Frames were designed according to INBC Code. These Frames were analyzed under ET acceleration functions in horizontal and vertical directions simultaneously and results were compared to Response History Analysis. It is observed that ET method can predict the results from multi-component analysis، including vertical excitation، with reasonable accuracy. Scattering and accuracy of the results are also investigated. Keywords: Endurance time method; intensifying acceleration functions; multi، directional

	An Experimental Study on Behavior of Polymer Cement Concrete V. Bhikshma ، K. Jagannadha Rao ، B. Balaji Page 563 (انگليسي) Abstract مشاهده متن [PDF 201KB]
	Polymer as admixture can improve the properties like higher strength and lower water permeability than the conventional concrete. Rheomix 141 is styrene-butadiene co–polymer latex، specifically designed for use with cement composites. It is used in mortar and concrete as an admixture to increase resistance to water penetration، improve abrasion resistance and durability. The objective of the present investigation is to study the behavior of polymer cement concrete in the hardened state. The variables studied include the grade of concrete and dosage of polymer. Five different grades of concrete M20 to M60 with polymer quantities starting from 5% to 10% were used in the present work. The various mechanical properties like compressive strength، splitting tensile strength، flexural strength، stress–strain characteristics، and modulus of elasticity and permeability characteristics of concrete have been studied. The results obtained thus are encouraging for partial addition of polymer with cement up to 10%. Keywords: Polymer Concrete; admixtures; rheomix; strength characteristics; permeability

	Experimental Analysis of the Dynamic Stress Distribution at the Soil Foundation Interface A. Boumekik ، S. Belhadj، Mostefa ، F. Meribout Page 575 (انگليسي) Abstract مشاهده متن [PDF 174KB]
	This paper presents the dynamic stresses within the soil-foundation interface zone measured by an experimental process. The cubic foundation prototype is subjected to a cyclic loading directly generated by the testing machine at the foundation center. The stress enhancement induced by the dynamic loading may lead to a partial confinement with an eventuality of instability risks or resistance loss; showed by a particle rearrangement. The tests have been conducted on two soil samples namely dense and medium dense sand. Experimental displacements، measured at the soil foundation interface are represented، as a function of the number of cycles، for a constant stress level. The dynamic behaviors of used sample soils are analyzed and some concluded remarks are presented. Keywords: Interaction soil، structure; dynamic loading; stresses; displacement; density

	Seismic Response of Adjacent Structures Connected with Maxwell Dampers C.C. Patel ، R.S. Jangid Page 585 (انگليسي) Abstract مشاهده متن [PDF 711KB]
	In this paper، the investigation is carried out to study the structural responses of two adjacent structures connected with Maxwell dampers under various earthquake excitations. The specific objective of this study is to evaluate the optimum damper parameter and its importance in response reduction of adjacent structures coupled by Maxwell dampers. The optimum damper parameter is investigated for the adjacent coupled structures subjected to four different types of earthquake ground motions. A formulation of the equations of motion for the two adjacent multi-degree-of-freedom (MDOF) structures connected with Maxwell dampers is presented. The numerical study is carried out for two adjacent MDOF structures connected with Maxwell dampers having same damper parameter in all dampers as well as، having different damper parameter in the dampers. The investigation is also carried out for effectiveness of the damper in terms of the structural response reduction، namely، displacement، acceleration and shear forces of adjacent connected structures. In addition، to minimize the cost of the dampers، the optimal location of the dampers، rather than providing the dampers at all floor levels is also investigated. Results show that using Maxwell dampers of appropriate parameter to connect the adjacent structures of different fundamental frequencies can effectively reduce earthquake-induced responses of either structure. Further، lesser dampers at appropriate locations can significantly reduce the earthquake response of connected system، there by reducing cost of damper significantly. Keywords: Adjacent structures; maxwell damper; optimum damper parameters; optimal location; seismic response

	Three-dimensional Scattering of Plane Harmonic SH, SV, and P Waves in Multilayered Alluvial Valleys B. Omidvar ، M. Rahimian ، T. Mohammadnejad ، A. Sanaeiha Page 605 (انگليسي) Abstract مشاهده متن [PDF 359KB]
	In this paper، three-dimensional amplification of plane harmonic SH، SV، and P waves in multilayered alluvial valleys is investigated by using a boundary element method in frequency domain. It is shown that in order to achieve real responses، the problem must be analyzed and modeled three-dimensionally. Also، for exact evaluation of surface ground motions in alluvial valleys all key parameters such as layering، material and geometrical characteristics of each layer، stimulation frequency، wave type، plus angle and azimuth of incidence must be taken into account altogether. The accuracy and efficiency of the proposed formulations for the computation of the surface displacement field amplification is verified by solving a number of problems. Keywords: Boundary element method; wave propagation; site effects; multilayered alluvial valley; 3D models

	A Genetic Rule-Based Fuzzy System to Estimate The Cover Thickness of Durable RC Structures J. Sobhani Page 627 (انگليسي) Abstract مشاهده متن [PDF 256KB]
	The skeptical part of building regulations for durability-design process might be attributed to the ambiguities arising from the qualitative and linguistic definitions of the relevant parameters when dealing with the service life and durability of reinforced concrete (RC) structures. Handling of these parameters with traditional methods is not a straightforward matter but fuzzy systems as an advanced tool for processing the linguistic knowledge could be easily utilized to address this issue. Accordingly this paper introduces a support system assisted by rule-based genetic fuzzy system to quantify the environmental aggressiveness and subsequently infer a minimum cover thickness for durable reinforced concrete members in the corrosive environments. Keywords: Reinforced concrete; concrete durability; rule، based fuzzy systems; genetic algorithm

	Nonlinear Dynamic Analysis of Structures Under Near-Fault Ground Motions Using an Improved Scaling Method A. Yahyaabadi ، M. Tehranizadeh Page 645 (انگليسي) Abstract مشاهده متن [PDF 605KB]
	Assessment of the seismic performance of a structure often requires conducting nonlinear dynamic analyses under a set of ground motion records scaled to a specific level of intensity using an appropriate scaling method. In this study to reduce the variability in the seismic demands، a seismic-intensity scaling index is developed through studying weaknesses and strengths of different scaling methods. Results of the incremental nonlinear dynamic analyses of generic frames with 3، 6، 9، 12 and 15 storey under 40 near-fault ground motions show that using root-mean-square value of pseudo spectral accelerations over effective period range of structures can considerably reduce the scatter in the dynamic responses particularly once higher modes and period elongation effects dominate the response. By using this scaling method، the amount of dispersion is nearly independent of the ductility demand level and the number of stories. Keywords: Nonlinear dynamic analysis; near، fault ground motions; seismic demands; scaling method; dispersion

	IRAN STRONG MOTION CATALOG (JUNE TO DECEMBER 2007) H. Mirzaei Alavijeh ، F. Sinaeian ، E. Farzanegan ، P. Karimi Qasr Page 663 (انگليسي) Abstract مشاهده متن [PDF 1370KB]
	Iran Strong Motion Network (ISMN) started its activities in 1973. Iran Strong Motion Network had 1087 digital (1082 SSA-2 and 5CMG-5TD) and 13 analog (SMA-1) accelerographs in operation in 2007. The accelerograms of different earthquake، are downloaded، controlled، processed، and then added to the comprehensive data bank، which is very useful for scientists and engineers in the field of engineering seismology and earthquake engineering. In the second half of the year 2007، 124 accelerograms (with PGA greater than the trigger level of 0.01g) were recorded by 91 accelerographs، which were triggered by 69 different earthquakes. The maximum PGA of about 0.148g was occurred in Tabriz station (Eastern Azerbaijan Province). Keywords: Acclerogram; accelerograph; earthquake; strong motion; peak ground acceleration, Iran

تاريخ انتشار: 26/4/89
تلفن: 88255942-6 (021)

تاريخ درج در سايت: 26/4/89
شمار بازديدکنندگان اين شماره: 282

چاپ فهرست

ارسال فهرست به ديگران

نظر بدهيد

معرفی سايت به ديگران

گزارش اشکال در اطلاعات

اشتراک نشريات ديگر

جستجوی مطالب

کلمه مورد نظر خود را وارد کنيد

جستجو در:

آرشيو اين مجله

همه مجلات عضو

مجلات علمی مصوب

متن روزنامه های عضو

جستجوی پيشرفته