Case study of the seismic response of an extra-dosed cable-stayed bridge with cable-sliding friction aseismic bearing using shake table tests

2017 ◽  
Vol 26 (16) ◽  
pp. e1398 ◽  
Author(s):  
Haolin Yang ◽  
Yutao Pang ◽  
Shengze Tian ◽  
Xinzhi Dang ◽  
Wancheng Yuan
Keyword(s):  
Seismic Response ◽  
Sliding Friction ◽  
Shake Table ◽  
Shake Table Tests ◽  
Cable Stayed Bridge

Shake-table tests on frame built in crumb rubber concrete

2020 ◽  
Vol 23 (10) ◽  
pp. 2003-2017
Author(s):  
Hanif Ullah ◽  
Naveed Ahmad ◽  
Muhammad Rizwan
Keyword(s):  
Experimental Study ◽  
Seismic Response ◽  
Crumb Rubber ◽  
Shake Table ◽  
Reinforced Concrete Frame ◽  
Shake Table Tests ◽  
Concrete Frame ◽  
Time Period ◽  
Crumb Rubber Concrete ◽  
Rubber Concrete

This article presents experimental study performed on a first-of-its-kind frame fabricated using crumb rubber concrete, that is, concrete with waste rubbers (crumb) as a partial replacement of fine aggregate (sand). A 20% volume of sand was replaced by rubber crumb. Free vibration and shake-table tests were performed on 1:3 reduced scale frame models, both conventional reinforced concrete frame and crumb rubber concrete frame. The dynamic properties (i.e. frequency/time period, elastic viscous damping, and floor acceleration amplification) and seismic response parameters (i.e. ductility and response modification factors) were obtained. In addition, lateral displacement demand was correlated with peak base acceleration to derive seismic response curves. The seismic performance of crumb rubber concrete frame was compared with the conventional reinforced concrete frame in order to assess the feasibility of rubberized concrete for building constructions in areas of active seismicity. The following were concluded on the basis of experimental study: the elastic damping reduced by 12%, the initial time period increased by 6%, specific weight of concrete reduced by 6%, maximum lateral load reduced by 20%, lateral maximum story drift capacity increased by 30%, displacement ductility ratio increased by 2%, response modification factor reduced by 24%, maximum peak base acceleration resistance corresponding the incipient collapse state increased by 40%.

Shake Table Tests of Structures with CFS Strap-Braced Stud Walls

2018 ◽  
Vol 763 ◽  
pp. 432-439
Author(s):  
Maria Teresa Terracciano ◽  
Bianca Bucciero ◽  
Tatiana Pali ◽  
Vincenzo Macillo ◽  
Luigi Fiorino ◽  
...  
Keyword(s):  
Shake Table ◽  
Test Program ◽  
Seismic Behaviour ◽  
Shake Table Tests ◽  
Experimental Activity ◽  
Experimental Campaign ◽  
Cold Formed Steel ◽  
The University ◽  
Reduced Scale

The unconventionality of the cold-formed steel (CFS) structures raised, in recent times, a lot of interest from many national and international companies resulting in the promotion of experimental activity with the main aim of investigating the seismic behaviour of these systems. In this perspective, a research project carried out at the University of Naples “Federico II” and funded by Lamieredil S.p.A. company started in the last years. The study included an extended experimental campaign, involving shake table tests on two three-storey prototypes in reduced scale (1:3). The investigated lateral load resisting systems were CFS strap-braced stud walls, designed as low dissipative seismic structures. The present paper illustrates case study, prototypes, test program and main shake table tests results.

scholarly journals Experimental Evaluation of the Seismic Response of Skewed Bridges with Emphasis on Poundings between Girder and Abutments

2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Ziqi Yang ◽  
Chern Kun ◽  
Nawawi Chouw
Keyword(s):  
Seismic Response ◽  
Experimental Research ◽  
Experimental Evaluation ◽  
Shake Table ◽  
Skew Angle ◽  
Shake Table Tests ◽  
Skewed Bridges ◽  
Single Frame ◽  
Bridge Model ◽  
Skew Angles

Observations from past earthquake events indicate that skewed bridges are seismically vulnerable due to induced horizontal in-plane rotations of the girder. To date, however, very limited experimental research has been done on the pounding behaviour of skewed bridges. In this study, shake table tests were performed on a single-frame bridge model with adjacent abutments subjected to uniform ground excitations. Bridges with different skew angles, i.e., 0°, 30°, and 45°, were considered. The pounding behaviour was observed using a pair of pounding and measuring heads. The results reveal that poundings could indeed influence the responses of skewed bridges in the longitudinal and transverse directions differently and thus affect the development of the girder rotations. Ignoring pounding effects, the 30° skewed bridges could experience more girder rotations than the 45° skewed bridges. With pounding, the bridges with a large skew angle could suffer more opening girder displacements than straight bridges.

Seismic Responses and Collapse of a RC Pedestrian Cable-Stayed Bridge: Shake Table Tests

2019 ◽  
Vol 19 (07) ◽  
pp. 1950067 ◽  
Author(s):  
Yue Zheng ◽  
You-Lin Xu ◽  
Sheng Zhan
Keyword(s):  
Ground Motion ◽  
Seismic Behavior ◽  
Mode Shapes ◽  
Collapse Mechanism ◽  
Shake Table ◽  
Seismic Responses ◽  
Shake Table Tests ◽  
Cable Stayed Bridge ◽  
Seismic Collapse ◽  
Cable Stayed Bridges

There have been numerous experimental studies on the seismic collapse of reinforced concrete (RC) buildings and RC girder bridges, but not on the seismic collapse of RC pedestrian cable-stayed bridges. Postearthquake field investigations revealed that if RC pedestrian cable-stayed bridges in seismic regions were not appropriately designed, they are likely to encounter severe damage or collapse. This paper thus presents an experimental investigation on a 1:12 scaled RC pedestrian cable-stayed bridge to explore the seismic behavior and collapse mechanism of the bridge under different levels of ground motion. The design, construction, and installation of the bridge, along with the shake table tests, were performed. The dynamic characteristic tests of the bridge were carried out, with the natural periods and mode shapes identified. The bridge was then tested by subjecting it to three levels of ground motion, i.e. small, moderate and large earthquakes. The seismic behavior and seismic-resistant capacity of the cable-stayed bridge were finally assessed at the component level and the failure mode of the bridge was identified based on the seismic responses recorded by the measurement system. The test results showed that the collapse of the RC pedestrian cable-stayed bridge was triggered from the flexure failure of its columns and ended with the flexure-shear failure of its tower.

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