A Pseudo-Space Model of Steel Staggered Truss System

2011 ◽  
Vol 105-107 ◽  
pp. 990-993
Author(s):  
Xiao Juan Li
Keyword(s):  
Modal Analysis ◽  
Seismic Performance ◽  
Pushover Analysis ◽  
Lateral Force ◽  
Original Structure ◽  
New Model ◽  
Space Model ◽  
Staggered Truss System ◽  
Force Characteristics

A pseudo-space model as a new model of Steel Staggered Truss System was proposed to assess the transverse seismic performance of the structure. Modal analysis and pushover analysis were performed on the space model and the pseudo-space model of SSTS with SAP2000. Through comparing the results of models, it showed that the pseudo-space model reflected the lateral force characteristics of the original structure, and could simulate the stress mechanism of the structure under transverse seismic.

Investigation of the Plane Model of Steel Staggered Truss System

2011 ◽  
Vol 105-107 ◽  
pp. 961-964
Author(s):  
Xiao Juan Li
Keyword(s):  
Modal Analysis ◽  
Dynamic Characteristics ◽  
Mechanical Characteristics ◽  
Pushover Analysis ◽  
Superior Performance ◽  
Structural System ◽  
Plane Model ◽  
Space Model ◽  
Good Economy ◽  
Staggered Truss System

Steel Staggered Truss System (SSTS) is a new structural system with flexible arrangement, superior performance and good economy. A plane model was established with SAP2000 and the feasibility of the plane model to study the dynamic characteristics of SSTS under horizontal earthquake was discussed through performing modal analysis and pushover analysis to the space model and the plane model of SSTS. By comparing the response of models, it showed that the plane model changed the mechanical characteristics of SSTS, and there existed errors using the plane model to research on the dynamic characteristics of SSTS under horizontal earthquake

scholarly journals Seismic Performance of Existing R/C Building with Irregular Floor Plan Shape

2018 ◽  
Vol 215 ◽  
pp. 01035
Author(s):  
Agus ◽  
Muhammad Ridwan ◽  
Febriyan Ramadhana
Keyword(s):  
Seismic Performance ◽  
Evaluation Method ◽  
Static Load ◽  
Pushover Analysis ◽  
Lateral Force ◽  
Public Works ◽  
Floor Plan ◽  
Lateral Direction ◽  
Medium Level ◽  
Immediate Occupancy

Bu33333333ilding with irregular floor plan has the eccentricity of force to the centre of building isappears to be more susceptible to deformation and damage when subjected to earthquake movements than with regular floor plan. This study aims to determine the seismic performance of buildings with the irregular floor plan in displacement and drift by service and ultimate performance limit.The object of research is Padang Pariaman public works office building. The evaluation method used non-linear static analysis(Pushover) which is one method to evaluate the seismic performance of the building.Pushover analysis performed by providing a static load in the lateral direction gradually to achieve a specific displacement target. This research is based on SNI-1726-2012, ATC-40 and FEMA 356. The results of the analysis show that the maximum lateral force of 10909.9 kN occurs in step-6 pushover analysis with a displacement of 0.165 m, maximum drift = 0.0705 m and maximum in-elastic drift = 0.025 m.This means the building is included in the IO (Immediate Occupancy) performance level. Although there is damage from small to medium level, still has a big threshold against the collapse, which means the building is safe against the earthquake.

scholarly journals Displacement Analysis of RC Frames and its Seismic Performance Appraisal

2020 ◽  
Vol 9 (3) ◽  
pp. 94-101
Keyword(s):  
Performance Appraisal ◽  
Seismic Performance ◽  
Design Method ◽  
Pushover Analysis ◽  
Lateral Force ◽  
Base Shear ◽  
Seismic Performance Evaluation ◽  
Analysis And Design ◽  
Direct Displacement Based Design ◽  
Rc Frames

In India when structure engineer’s analysis and design a structure like buildings, they are checking it for displacement because of safety and control of damages; so in this paper a set of frames with different height of reinforced moment resisting frames were analyzed by two popular methods of performance-based plastic design method and direct displacement-based design method. For calculation of base shear, the IS code has been used in both methods and ETABS software used for seismic performance evaluation by nonlinear static pushover analysis. The results of analysis with different methods compared by suitable parameters and graphs, such as: (a) story lateral force, (b) beam seismic moment, (c) displacement profile and (d) capacity curve. Results show acceptable performance in 2 methods in terms of capacity and deformation

Analysis of Seismic Performance of RC Frames with Centrally Reinforced Columns

2013 ◽  
Vol 671-674 ◽  
pp. 1319-1323
Author(s):  
Zi Xue Lei ◽  
Yu Hang Han ◽  
San Sheng Dong ◽  
Jun Qing Guo
Keyword(s):  
Seismic Performance ◽  
Cross Sections ◽  
Carrying Capacity ◽  
Pushover Analysis ◽  
Seismic Load ◽  
Load Carrying Capacity ◽  
Rc Columns ◽  
Rc Column ◽  
Rc Frames ◽  
Load Carrying

A centrally reinforced column is a new type of RC columns, formed by providing a reinforcement skeleton at the central part of the cross section of an ordinary RC column. Tests have shown that as compared with an ordinary RC column, this type of columns has a higher load carrying capacity and ductility. From the pushover analysis of a frame composed of ordinary RC columns and one consisting of centrally reinforced columns, their seismic performance under seismic load of 9-degree intensity was studied according to Chinese code, including target displacements, story-level displacements, interstory drifts, appearance and development of plastic hinges. The results indicate that although the dimensions of cross sections of columns in the frame with centrally reinforced columns are smaller than those of the ordinary frame, the former still has a higher overall load carrying capacity and seismic performance than the latter.

scholarly journals Effects of Structural Parameters on Seismic Behaviour of Historical Masonry Minaret

2017 ◽  
Author(s):  
Barış Erdil ◽  
Mücip Tapan ◽  
İsmail Akkaya ◽  
Fuat Korkut
Keyword(s):  
Modal Analysis ◽  
Structural Parameters ◽  
Masonry Structure ◽  
Operational Modal Analysis ◽  
Shear Cracks ◽  
Seismic Behaviour ◽  
New Model ◽  
The Core ◽  
Historical Masonry ◽  
Stiffness Distribution

The October 23, 2011 (Mw = 7.2) and November 9, 2011 (Mw = 5.6) earthquakes increased the damage in the minaret of Van Ulu Mosque, an important historical masonry structure built with solid bricks in Eastern Turkey, resulting in significant shear cracks. It was found that since the door and window openings are not symmetrically placed, they result in unsymmetrical stiffness distribution. The contribution of staircase and the core on stiffness is ignorable but its effect on the mass is significant. The pulpit with chamfered corner results in unsymmetrical transverse displacements. Brace wall improves the stiffness however contributes to the unsymmetrical behaviour considerably. The reason for the diagonal cracks can be attributed to the unsymmetrical brace wall and the chamfered pulpit but the effect of brace wall is more pronounced. After introducing the cracks, a new model was created and calibrated according to the results of Operational Modal Analysis. Diagonal cracks were found to be likely to develop under earthquake loading. Drifts are observed to increase significantly upon the introduction of the cracks.

A Seismic Effective Method for Double-Layer Reticulated Shell Using Buckling-Restrained Braces

2010 ◽  
Vol 163-167 ◽  
pp. 2852-2856
Author(s):  
Chang Wu ◽  
Xiu Li Wang
Keyword(s):  
Double Layer ◽  
Seismic Performance ◽  
Linear Time ◽  
Ground Motions ◽  
Equations Of Motion ◽  
Time History ◽  
Original Structure ◽  
Loading Test ◽  
Strong Earthquakes ◽  
Buckling Restrained Braces

In this study a kind of buckling-restrained braces (BRBs) as energy dissipation dampers is attempted for seismic performance of large span double-layer reticulated shell and the effectiveness of BRBs to protect structures against strong earthquakes is numerically studied. The hysteretic curve of such members is obtained through the simulation of the cyclic-loading test, and the equations of motion of the system under earthquake excitations are established. BRBs are then placed at certain locations on the example reticulated shell to replace some normal members, and the damping effect of the two installation schemes of BRBs is investigated by non-linear time-history analyses under various ground motions representing major earthquake events. Compared with the seismic behavior of the original structure without BRBs, satisfactory seismic performance is seen in the upgraded models, which clarifies the BRBs can reduce the vibration response of spatial reticulated structure effectively and the new system has wide space to develop double layer reticulated shell.

Seismic Performance Assessment of Offshore Reinforced Concrete Bridges Using the Force Analogy Method

2016 ◽  
Vol 16 (05) ◽  
pp. 1550012 ◽  
Author(s):  
Yu Zhang ◽  
Hong-Nan Li ◽  
Gang Li
Keyword(s):  
Reinforced Concrete ◽  
Performance Assessment ◽  
Seismic Performance ◽  
High Efficiency ◽  
Pushover Analysis ◽  
Chloride Ions ◽  
Initial Stiffness ◽  
Seismic Performance Assessment ◽  
Analogy Method ◽  
Plastic Mechanism

In this paper, the seismic performance of offshore reinforced concrete (RC) bridges during their life cycle periods is assessed by the pushover analysis based on the concept of the force analogy method (FAM). The governing equations and implementation process of the proposed pushover method are first derived. The material nonlinearity is modeled by the local plastic mechanism, which is capable of simulating the monotonic strength hardening and softening behaviors of RC piers. The chloride ions corrosion effect for the RC bridges located in coastal areas is considered by using the deterioration model for the mechanical property of reinforcement steel. Besides, structural stability against overturning is considered by incorporating the geometric nonlinearity with the FAM. Since the initial stiffness matrices remain constant through the computation process, the advantages of the FAM, such as high efficiency and stability, are retained. A numerical example is carried out to illustrate the process of seismic performance assessment for offshore RC bridges with the FAM.

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