Response Of Multi-story Structure Research Articles

Seismic Response of Multi Story Structure Strengthened with Micropiles

Micropiles are reinforced grouted piles that have small diameters commonly not higher than 30 cm. They are widely used for slope stabilization, controlling structural settlement, and in some cases, as retaining structures. Also, they are used for resisting dynamic uplift loads, seismic retrofit mainly in restrictive and low headroom areas, and retrofitting of historical monuments. The main goal of this research is to develop a finite element model that can capture the different aspects of seismic behavior of multi-story structure supported with deep foundation via using of micropiles. Also, a main target for the executing numerical modelling is to show the influence of the surrounding soil on this system and vice versa. Firstly, a representative two-dimensional finite element model is conducted to represent the soil-structure interaction system under seismic excitation supported with proper boundary conditions in PLAXIS 2D V20 for dynamic analysis based on previous recommendations considering the nonlinear soil behavior. The behavior of micropiles is studied and verified using previous results. Based on these models, the effect of lateral dynamic loads on the response of a structure with different foundation types is investigated. Also, a wide range of parametric studies, considering structure properties, earthquake magnitude, micropile diameter, micropile length, and the number of micropiles, have been carried out in order to investigate the actual interaction between soil, substructure, and superstructures. The study results showed that the seismic response of the structure is highly affected by the properties of the sub-surface soil layer. Consequently and similarly, analysis results established that underpinning using micropiles is an efficient technique for controlling the seismic response of existing structures.

Erratum to: Seismic response of multi-story structure with multiple tuned mass friction dampers

Erratum to: Seismic response of multi-story structure with multiple tuned mass friction dampers

Vibration Suppression System Design for Multidegree of Freedom System using Closed Loop System Redesign.

This paper aims at proposing a new design method of active/ passive hybrid type of vibration suppression system for reducing the dynamic response of multi-story structures due to earthquake or other dynamic loads. Proposed new design method of hybrid vibration suppression system is based on closed loop system redesign which was proposed by the authors. Optimum design problem is formulated for the multi-story structure equipped with an active mass damper and oil dampers. The objective function is a linear combination of the evaluation of control power requirement of the active mass damper and the vibration suppression performance index of oil dampers. Availability of the proposed design method is numerically and experimentally demonstrated. Hybrid vibration suppression system for two-story structure is successfully designed by using proposed design method. Both numerical and experimental results indicate that hybrid vibration suppression system is effective comparing with full active vibration suppression system from the viewpoint of the active control power requirement under the equal vibration suppression performance codition.

A three-dimensional animation system for seismic response of multistory structures

A three-dimensional animation system has been developed for visualizing the dynamic response of multistory structures subjected to earthquake excitations, using the IRIX operating system and implemented in Graphics Library (GL) Windows and ANSI C programming language. The animation system includes three-dimensional multistory frames with flexible floors. The input can be any accelerogram data (ground acceleration record) due to any real or artificial earthquake. The user of the system can select the input parameters of the structure, such as the number of bays, stories, bay width, story height, etc., and view their effect on the dynamic behavior of the structure. Sample outputs are presented for two irregular high-rise building structures. The graphics interface is linked to the dynamic analysis program. It computes the required displacements to be inputted back into the graphics interface which plots the deflected profile of the structure dynamically. © 1997 John Wiley & Sons, Inc. Int J Imaging Syst Technol, 8, 313–321, 1997

Closure to “Response of Multi-Story Structures to Earthquakes”

Closure to “Response of Multi-Story Structures to Earthquakes”

Response of Multi-Story Structures to Earthquake

Behavior of multistory buildings responding to strong earthquake ground motion has been computed by high-speed digital computer; response curves and tables and data on effects of certain structural parameters on response are presented.

Discussion of “Response of Multi-Story Structures to Earthquake”

Discussion of “Response of Multi-Story Structures to Earthquake”

Discussion of “Response of Multi-Story Structures to Earthquakes”

Discussion of “Response of Multi-Story Structures to Earthquakes”

Discussion of “Response of Multi-Story Structures to Earthquakes”

Discussion of “Response of Multi-Story Structures to Earthquakes”