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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Civil Engineers
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Korean Society of Civil Engeneers
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Volume & Issues
Volume 18, Issue 3_6 - Nov 1998
Volume 18, Issue 2_6 - Nov 1998
Volume 18, Issue 1_6 - Nov 1998
Volume 18, Issue 3_5 - Sep 1998
Volume 18, Issue 2_5 - Sep 1998
Volume 18, Issue 1_5 - Sep 1998
Volume 18, Issue 3_4 - Jul 1998
Volume 18, Issue 2_4 - Jul 1998
Volume 18, Issue 1_4 - Jul 1998
Volume 18, Issue 3_3 - May 1998
Volume 18, Issue 2_3 - May 1998
Volume 18, Issue 1_3 - May 1998
Volume 18, Issue 3_2 - Mar 1998
Volume 18, Issue 2_2 - Mar 1998
Volume 18, Issue 1_2 - Mar 1998
Volume 18, Issue 3_1 - Jan 1998
Volume 18, Issue 2_1 - Jan 1998
Volume 18, Issue 1_1 - Jan 1998
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A Study on the Automatic Calculation of Equivalent Nodal Forces for Prestressed Concrete Shell Structures
Oh, Byung-Hwan ; Lee, Myung-Gue ; Chae, Seong-Tae ; Jin, Nam-Hee ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_3, 1998, Pages 277~277
The conventional methods for the calculation of equivalent nodal forces of prestressed concrete shell structures have disadvantage in preparing extensive input data as we change the shape of the structure and the tendon path. To overcome this difficulty, this paper proposes an efficient method to generate equivalent nodal forces for each node of a shell element. The tendon path may be straight, parabolic and spherical in its shape. The present method automatically determine the point of intersection of a tendon with the interfaces of the finite elements passed through by this tendon. After calculating the prestressing force at the shell element boundary, the equivalent nodal forces related to each node of a shell element are calculated considering eccentricity between tendon point and the node. To take account of prestress losses. instantaneous losses such as friction loss and anchorage slip loss were considered in this paper. To verify the validity of the proposed method, prestressed concrete one way slab was analyzed and compared with the result by the program SPCFRAME. To show the applicability of the proposed method to various prestressing cases, prestressed concrete shell structure containing many tendons were also analyzed.
The Role of Tension Stiffening in the Ultimate Behavior of RC Hyperbolic Paraboloid Saddle Shell
Min, Chang-Shik ; Son, Seong-Yo ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_3, 1998, Pages 289~289
Ultimate behavior of a reinforced concrete (RC) hyperbolic paraboloid saddle shell under uniformly distributed vertical load is investigated using an inelastic finite-element program originally developed at North Carolina State University. Unlike with the author's previous study which shows that the saddle shell possesses a tremendous capacity to redistribute the stresses by developing full-blown through cracks on the shell. introducing tension stiffening in the model the cracks developed are no longer through cracks and formed as primarily bending cracks. The load-deflection curves are straight and the slope of the curves is quite steep and remains unchanged with varying the tension stiffening. The failure of the shell took place quite suddenly in a cantilever mode initiated by a formation of yield lines in a direction parallel to the support-to-support diagonal. The higher the tension stiffening parameters the higher is the ultimate load. The ultimate behavior of the shell primarily depends on the concrete tensile characteristics. such as tensile strength (before cracking) and the effective tension stiffening (after cracking). As the concrete characteristics would vary over the life of the shell, a degree of uncertainty is involved in deciding a specified ultimate strength of the saddle shell studied. By the present study, however the overload factors based on ACI 318-95 are larger than unity for all the cases studied except that the tension stiffening parameter is smaller than 3, which shows that the Lin-Scordelis saddle shell studied here is at least safe.
Out-of-Plane Free Vibrations of Horizontally Catenary Curved Beams in Cartesian Co-ordinates
Lee, Byoung-Koo ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_3, 1998, Pages 303~303
The differential equations governing free, out-of-plane vibrations of the elastic, catenary curved beams are derived in cartesian co-ordinates using the dynamic equilibrium equations based on the Timoshenko beam theory. These equations are solved numerically to obtain the natural frequencies and the corresponding mode shapes for such curved beams. The Runge-Kutta method and the Regula-Falsi method are used to integrate the differential equations and to determine the natural frequencies, respectively. In numerical examples, the clamped-clamped and hinged-hinged end constraints are considered. The results of natural frequencies obtained from the commercial package SAP 90 serve to validate the theoretical results of the present study. The four lowest natural frequencies are reported as functions of four non-dimensional system parameters. Also the typical mode shapes are presented.
Study on the Fundamental Properties of Antiwashout Underwater Concrete
Kim, Jin-Cheol ; Jeong, Yong ; Moon, Han-Young ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_3, 1998, Pages 313~313
The objective of this study was to investigate the fundamental properties of antiwashout underwater concrete. The hydration heat of cement paste, slump flow loss with time, antiwashout property, filling property, and the compressive strength of both cast-in-air and cast-in-water have been examined experimentally. Use of antiwashout admixture delayed the set of concrete, but did not reduce the strength of concrete. An appropriate dosage of antiwashout admixture was found to be
. Incorporation of ground granulated blast furnace slag into underwater concrete improved slump flow loss with time and increased the ratio of compressive strength of cast-in-water to that of cast-in-air up to 96% or more. The flexural strength and splitting tensile strength of the antiwashout underwater concrete were reduced to about 0.36 and 0.75 respectively with inclusion of construction joint, when placed under water
Soil-Structure Interaction Analysis Using Finite Element and Boundary Element Coupling
Rhee, Jong-Woo ; Kim, Moon-Kyum ; Lim, Yun-Mook ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_3, 1998, Pages 323~323
The coupling of finite elements and boundary elements, which can be used for the soilstructure interaction analysis in multi-layered half planes is developed. To handle the complicated geometry and various material properties. the near field involving the structures is modeled using conventional finite elements. The far field beyond the finite elements region is modeled using developed boundary elements, which satisfy the radiation condition of half planes with muli-layers. In general, the soil media is multi-layered, therefore, the multi-layered nature of the object effects the responses due to the reflected waves. The fundamental solutions for boundary element method which satisfy the reflection and transmission conditions of waves at each layer interface are developed in this study. It makes it possible to analyze the dynamic problems economically without any difficulties in multi-layered problem. The fundamental solutions are derived using the equations of motions in cylindrical coordinates for easy applications to not only two dimensional but three dimensional problems. To validate the proposed method, responses of an infinite rigid strip footing on a multi-layered system is presented. Some numerical examples of structures are given to show the efficiency of proposed method and to demonstrate the dynamic behavior of each structures with various properties.
The Fatigue Life of Transverse Stiffener with Damaged Bead Section
Woo, Sang-Ik ; Jung, Kyoung-Sup ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_3, 1998, Pages 335~335
The fatigue strength parameters of welded joints under cyclic dynamic loading include loading pattern, surface condition of bead, and welding flaws. The discussion of the general fatigue behaviour of welded joints has also shown that their fatigue strengths were dominated by geometric factors. In this study, we tried to confirm the fatigue strength of steel damaged bridge components by fatigue test of the specimens. We measured the variation of the strains and elongations of specimens under the cyclic static loading. According to the result of this test, the damaged area did not greatly affect fatigue life, but the area damaged by gouging induced geometric factor of stress concentrations. Therefore initial crack growth was found in the damaged area. It is considered that the current fatigue criteria underestimates the fatigue life of the memebers with damged area modified by gouging. We have confirmed them both gouged specimens and no gouging specimens have satisfied AASHTO fatigue category C and JSSC E.
Geometric Nonlinear Analysis of Beams Considering Warping Effect
Kwak, Hyo-Gyoung ; Lee, Hwan-Woo ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_3, 1998, Pages 345~345
Geometric nonlinear analysis of three dimensional beams with thin walled open sections are performed. The displacement field are described based on the total lagrangian formulation and the warping degree of freedom has been taken into consideration to simulate the structural behaviors of slender or curved beams more exactly. The element stiffness constructed with the assumption of the Euler-Bernoulli theory which neglects the shear deformation is transformed into the global coordinate system by using the Eulerian angles. After taking the static condensation to reduce the warping degree of freedom, the improved arc-length method in connection with the proposed algorithm is adopted to obtain the numerical result efficiently even in the snap-through buckling behavior. Finally, correlation studies between analytical results and other previous numerical studies are conducted to establish the validity of the proposed numerical approach.
Influence of Transverse Section Stiffness on the Impact Factor for a Bridge
Chung, Chul-Hun ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_3, 1998, Pages 357~357
The main objectives of this research are to study the influence of transverse stiffness on the impact factor of multigirder concrete bridges. The dynamic test results show that the transverse cross beams of bridges greatly affects the lateral dynamic load distribution of concrete multigirder bridges. For the flexible bridge transverse section, it has been observed that the impact factor obtained from measurement girders far from the test vehicle position is higher than that for a measurement girder located directly under the test vehicle load. The difference of impact factors between exterior and interior girders would increase with the increase of vehicle speed. But, the increase of transverse stiffness makes the lateral distribution of impact factors more uniform. The experimental results have been compared with theoretical results reported by Wang (1992) The comparison shows that the agreement between experiment and theory is quite satisfactory.
Method for Linearly Varying Distributed Loads in the Second-Order Inelastic Frame Analysis
Kim, Sung-Mo ; Lee, Ki-Jang ; Choi, Joon-Ho ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_3, 1998, Pages 369~369
In this paper, the method to consider the linearly varying distributed load in the secondorder inelastic frame analysis is provided. The deflection equation of a member under a linearly varying distributed load is derived and then based on this equation the effect of the linearly varying distributed loads is considered by modifying the moment-deflection equation that includes the stability functions. The fixed end moment that is added to the original moment is dependent on the existense of a plastic hinge and the location of a plastic hinge. The location and amount of the maximum moment except the end moment in a member are calculated. After that the real maximum moment can be obtained by comparing the moments. Finally, when the tangent stiffness matrix is used in each iteration, the tangent stiffness relationship is modified due to the linearly varying distributed load. Several examples are presented to investigate the proposed procedure.
Experimental Study On the Ultimate Bending Strength of Longitudinally Stiffened Plate Girders
Bae, Doo-Byong ; Kong, Byung-Seung ; Park, Hae-Sul ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_3, 1998, Pages 379~379
The main objective of this research is to evaluate the effect of longitudinal stiffeners on the static behavior of plate girder panels and to determine the ultimate bending strength of plate girders with and without longitudinal stiffeners. Eleven plate girders with different thickness, arrangements and web slenderness ratios are tested. The test results are compared and discussed with the theoretical buckling strength and the ultimate bending strength developed by Basier and Th limann. And the results are analyzed together with other test results of plate girders with different web slenderness ratios. In most design specification of plate girder bridges, the theoretical web buckling strength is still the criterion for limit of usefulness. even though the post buckling strength is considered by using rational factor of safety. However, the test results show that there is no constant relationship between the ultimate strength and the theoretical buckling strength and longitudinal stiffeners have no significant effect on the observed ultimate strength of plate girders.
Strategic Planning of CIC and CIT for the Effective Execution of Construction Processes
Moon, Sung-Woo ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_3, 1998, Pages 389~389
The Korean construction industry is faced with increased competition inside and outside the nation. Computer-Integrated Construction (CIC) and Construction Information Technology (CIT) is to integrate the management of the design and construction, and utilize the information generated during the process in an information network. CIC and CIT can be implemented to improve the cost-effectiveness of the construction process and to overcome the challenge in the market. This paper identifies the characteristics of CIC and CIT through survey and interview. and tries to help the industry establish a strategic plan. The study results indicate that: 1) CIC technologies should be executed in an information network. 2) large-sized general contractors need an integrated management system based on a commonly-accessible databases, 3) small-sized specialty companies need specific CIC technologies to fit into the integrated system, and 4) companies should work in a partnership to maximize the resources necessary for developing the paradigm.