Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Structural Engineering and Mechanics
Journal Basic Information
Journal DOI :
Editor in Chief :
Volume & Issues
Volume 10, Issue 6 - Dec 2000
Volume 10, Issue 5 - Nov 2000
Volume 10, Issue 4 - Oct 2000
Volume 10, Issue 3 - Sep 2000
Volume 10, Issue 2 - Aug 2000
Volume 10, Issue 1 - Jul 2000
Volume 9, Issue 6 - Jun 2000
Volume 9, Issue 5 - May 2000
Volume 9, Issue 4 - Apr 2000
Volume 9, Issue 3 - Mar 2000
Volume 9, Issue 2 - Feb 2000
Volume 9, Issue 1 - Jan 2000
Selecting the target year
Soil-structure interaction effect on active control of multi-story buildings under earthquake loads
Chen, Genda ; Chen, Chaoqiang ; Cheng, Franklin Y. ;
Structural Engineering and Mechanics, volume 10, issue 6, 2000, Pages 517~532
DOI : 10.12989/sem.2000.10.6.517
A direct output feedback control scheme was recently proposed by the authors for single-story building structures resting on flexible soil body. In this paper, the control scheme is extended to mitigate the seismic responses of multi-story buildings. Soil-structure interaction is taken into account in two parts: input at the soil-structure interface/foundation and control algorithm. The former reflects the effect on ground motions and is monitored in real time with accelerometers at foundation. The latter includes the effect on the dynamic characteristics of structures, which is formulated by modifying the classical linear quadratic regulator based on the fundamental mode shape of the soil-structure system. Numerical result on the study of a
-scale three-story structure, supported by a viscoelastic half-space of soil mass, have demonstrated that the proposed algorithm is robust and very effective in suppressing the earthquake-induced vibration in building structures even supported on a flexible soil mass. Parametric studies are performed to understand how soil damping and flexibility affect the effectiveness of active tendon control. The selection of weighting matrix and effect of soil property uncertainty are investigated in detail for practical applications.
Role of membrane forces in seismic design of reinforced concrete liquid storage structures
Schnobrich, W.C. ;
Structural Engineering and Mechanics, volume 10, issue 6, 2000, Pages 533~543
DOI : 10.12989/sem.2000.10.6.533
To prevent major cracking and failure during earthquakes, it is important to design reinforced concrete liquid storage structures, such as water and fuel storage tanks, properly for the hydrodynamic pressure loads caused by seismic excitations. There is a discussion in recent Codes that most of the base shear applied to liquid containment structures is resisted by inplane membrane shear rather than by transverse flexural shear. The purpose of this paper is to underline the importance of the membrane force system in carrying the base shear produced by hydrodynamic pressures in both rectangular and cylindrical tank structures. Only rigid tanks constrained at the base are considered. Analysis is performed for both tall and broad tanks to compare their behavior under seismic excitation. Efforts are made to quantify the percentage of base shear carried by membrane action and the consequent procedures that must be followed for safe design of liquid containing storage structures.
Field measurement results of Tsing Ma suspension Bridge during Typhoon Victor
Xu, Y.L. ; Zhu, L.D. ; Wong, K.Y. ; Chan, K.W.Y. ;
Structural Engineering and Mechanics, volume 10, issue 6, 2000, Pages 545~559
DOI : 10.12989/sem.2000.10.6.545
A Wind and Structural Health Monitoring System (WASHMS) has been installed in the Tsing Ma suspension Bridge in Hong Kong with one of the objectives being the verification of analytical processes used in wind-resistant design. On 2 August 1997, Typhoon Victor just crossed over the Bridge and the WASHMS timely recorded both wind and structural response. The measurement data are analysed in this paper to obtain the mean wind speed, mean wind direction, mean wind inclination, turbulence intensity, integral scale, gust factor, wind spectrum, and the acceleration response and natural frequency of the Bridge. It is found that some features of wind structure and bridge response are difficult to be considered in the currently used analytical process for predicting buffeting response of long suspension bridges, for the Bridge is surrounded by a complex topography and the wind direction of Typhoon Victor changes during its crossing. It seems to be necessary to improve the prediction model so that a reasonable comparison can be performed between the measurement and prediction for long suspension bridges in typhoon prone regions.
Protective systems for high-technology facilities against microvibration and earthquake
Yang, Jann N. ; Agrawal, Anil K. ;
Structural Engineering and Mechanics, volume 10, issue 6, 2000, Pages 561~575
DOI : 10.12989/sem.2000.10.6.561
Microvibration of high technology facilities, such as semiconductor plants and facilities with high precision equipments, due to nearby road and rail traffic has attracted considerable attention recently. In this paper, a preliminary study is conducted for the possible use of various protective systems and their performance for the reduction of microvibration. Simulation results indicate that passive base isolation systems, hybrid base isolation systems, passive floor isolation systems, and hybrid floor isolation systems are quite effective and practical. In particular, the performances of hybrid floor isolation systems are remarkable. Further, passive energy dissipation systems are not effective for the reduction of microvibration. Finally, the protections against both microvibration and earthquake are also investigated and presented.
Nonlinear analysis on concrete-filled rectangular tubular composite columns
Lu, Xilin ; Yu, Yong ; Kiyoshi, Tanaka ; Satoshi, Sasaki ;
Structural Engineering and Mechanics, volume 10, issue 6, 2000, Pages 577~587
DOI : 10.12989/sem.2000.10.6.577
A 3D nonlinear finite element computation model is presented in order to analyze the concrete filled rectangular tubular (CFRT) composite structures. The concrete material model is based on a hypo-elastic orthotropic approach while the elasto-plastic hardening model is employed for steel element. The comparisons between experimental and analytical results show that the proposed model is a relatively simple and effective one. The analytical results show that the capacity of inner concrete of CFRT column mainly depends on the two diagonal zones, and the confining effect of CFRT section is mainly concentrated on the corner zones. At the ultimate state, the side concrete along the section cracks seriously, and the corner concrete softens with the increase of compressive strains until failure.
Seismic detailing of reinforced concrete beam-column connections
Kim, Jang Hoon ; Mander, John B. ;
Structural Engineering and Mechanics, volume 10, issue 6, 2000, Pages 589~601
DOI : 10.12989/sem.2000.10.6.589
A simplified analysis procedure utilizing the strut-tie modeling technique is developed to take a close look into the post-elastic deformation capacity of beam-column connections in ductile reinforced concrete frame structures. Particular emphasis is given to the effect of concrete strength decay and quantity and arrangement of joint shear steel. For this a fan-shaped crack pattern is postulated through the joints. A series of hypothetical rigid nodes are assumed through which struts, ties and boundaries are connected to each other. The equilibrium consideration enables all forces in struts, ties and boundaries to be related through the nodes. The boundary condition surrounding the joints is obtained by the mechanism analysis of the frame structures. In order to avoid a complexity from the indeterminacy of the truss model, it is assumed that all shear steel yielded. It is noted from the previous research that the capacity of struts is limited by the principal tensile strain of the joint panel for which the strain of the transverse diagonal is taken. The post-yield deformation of joint steel is taken to be the only source of the joint shear deformation beyond the elastic range. Both deformations are related by the energy consideration. The analysis is then performed by iteration for a given shear strain. The analysis results indicate that concentrating most of the joint steel near the center of the joint along with higher strength concrete may enhance the post-elastic joint performance.
An efficient modeling technique for floor vibration in multi-story buildings
Lee, Dong-Guen ; Ahn, Sang-Kyoung ; Kim, Jinkoo ;
Structural Engineering and Mechanics, volume 10, issue 6, 2000, Pages 603~619
DOI : 10.12989/sem.2000.10.6.603
Analysis of a framed structure for vertical vibration requires a lot of computational efforts because large number of degrees of freedom are generally involved in the dynamic responses. This paper presents an efficient modeling technique for vertical vibration utilizing substructuring technique and super elements. To simplify the modeling procedure each floor in a structure is modeled as a substructure. Only the vertical translational degrees of freedom are selected as master degrees of freedom in the inside of each substructure. At the substructure-column interface, horizontal and rotational degrees of freedom are also included considering the compatibility condition of slabs and columns. For further simplification, the repeated parts in a substructure are modeled as super elements, which reduces computation time required for the construction of system matrices in a substructure. Finally, the Guyan reduction technique is applied to enhance the efficiency of dynamic analysis. In numerical examples, the efficiency and accuracy of the proposed method are demonstrated by comparing the response time histories and the analysis time.
Dynamic behaviors of the bridge considering pounding and friction effects under seismic excitations
Kim, Sang-Hyo ; Lee, Sang-Woo ; Mha, Ho-Seong ;
Structural Engineering and Mechanics, volume 10, issue 6, 2000, Pages 621~633
DOI : 10.12989/sem.2000.10.6.621
Dynamic responses of a bridge system with several simple spans under longitudinal seismic excitations are examined. The bridge system is modeled as the multiple oscillators and each oscillator consists of four degrees-of-freedom system to implement the poundings between the adjacent oscillators and the friction at movable supports. Pounding effects are considered by introducing the impact elements and a bi-linear model is adopted for the friction force. From the parametric studies, the pounding is found to induce complicated seismic responses and to restrain significantly the relative displacements between the adjacent units. The smaller gap size also restricts more strictly the relative displacement. It is found that the relative displacements between the abutment and adjacent pier unit became much larger than the responses between the inner pier units. Consequently, the unseating failure could take a place between the abutment and nearby pier units. It is also found that the relative displacements of an abutment unit to the adjacent pier unit are governed by the pounding at the opposite side abutment.
Adaptive nodal generation with the element-free Galerkin method
Chung, Heung-Jin ; Lee, Gye-Hee ; Choi, Chang-Koon ;
Structural Engineering and Mechanics, volume 10, issue 6, 2000, Pages 635~650
DOI : 10.12989/sem.2000.10.6.635
In this paper, the adaptive nodal generation procedure based on the estimated local and global error in the element-free Galerkin (EFG) method is proposed. To investigate the possibility of h-type adaptivity of EFG method, a simple nodal refinement scheme is used. By adding new node along the background cell that is used in numerical integration, both of the local and global errors can be controlled adaptively. These errors are estimated by calculating the difference between the values of the projected stresses and original EFG stresses. The ultimate goal of this study is to develop the reliable nodal generator based on the local and global errors that is estimated posteriori. To evaluate the performance of proposed adaptive procedure, the convergence behavior is investigated for several examples.