A New Pulse-Based E-R-μ Method for Predicting the Peak Seismic Response of Highly Nonlinear Bridge Structures

2017 ◽  
Author(s):  
Viacheslav Koval ◽  
Constantin Christopoulos ◽  
Robert Tremblay
Keyword(s):  
Seismic Response ◽  
Highly Nonlinear ◽  
Bridge Structures

Effect of abutment modeling on the seismic response of bridge structures

2008 ◽  
Vol 7 (4) ◽  
pp. 395-402 ◽  
Author(s):  
Ady Aviram ◽  
Kevin R. Mackie ◽  
Bozidar Stojadinovic
Keyword(s):  
Seismic Response ◽  
Bridge Structures

A New Hybrid SPH–FEM Model to Evaluate Seismic Response of TSD Equipped-Structures

2019 ◽  
Vol 13 (02) ◽  
pp. 1950007 ◽  
Author(s):  
Amir M. Halabian ◽  
Amin Karamnasab ◽  
Mohammad R. Chamani
Keyword(s):  
Seismic Response ◽  
Natural Frequency ◽  
Nonlinear Behavior ◽  
Numerical Data ◽  
Liquid Sloshing ◽  
Wind Loading ◽  
Weakly Compressible ◽  
Highly Nonlinear ◽  
Smoothed Particle ◽  
Higher Modes Effect

Tuned Sloshing Dampers (TSD) are passive devices, working based on shallow liquid sloshing in a rigid tank to suppress the horizontal structural vibrations induced by wind loading or earthquake excitations. The key parameters in design of a TSD could be referred to the natural frequency of the liquid sloshing motion and the inherent damping of the TSD during the excitation. Due to the highly nonlinear behavior of the liquid free-surface occurring in TSDs, accurate prediction of the TSD-structure’s behavior during strong excitations is highly desirable. In the current paper, Weakly Compressible form of Smoothed Particle Hydrodynamic (SPH) method is used to simulate the flow within rectangular TSDs during large movements. Characteristics of the flow such as wave height and sloshing forces acting on the container’s walls are calculated and compared with the existing experimental and numerical data. A hybrid SPH-Finite Element Method (FEM) was developed to investigate the seismic response of MDOF structures equipped with multiple TSDs. The proposed model was employed to evaluate the dynamic response of MDOF structures under severe seismic excitations with different frequency contents. The results showed that depending on the frequency content of the ground motion, having the TSDs tuned to a frequency close to the natural frequency of the structure could significantly alter the seismic response of the structures. The effectiveness of TSD is also related to the higher modes effect for MDOF structures and location of TSDs placed on the structural floors.

Random Seismic Response Analysis of Long-Span Bridge Structures

2012 ◽  
Vol 204-208 ◽  
pp. 2157-2161 ◽  
Author(s):  
Zhang Jun Liu ◽  
Yan Fu Xing ◽  
Yong Wan
Keyword(s):  
Seismic Response ◽  
Independent Random Variables ◽  
Response Analysis ◽  
Orthogonal Expansion ◽  
Bridge Structure ◽  
Seismic Response Analysis ◽  
Long Span ◽  
Long Span Bridge ◽  
Bridge Structures ◽  
Random Seismic Response

Based on the orthogonal expansion method of stochastic processes, seismic acceleration processes can be represented as a linear combination of deterministic functions modulated by a set of mutually independent random variables. In conjunction with the probability density evolution method, the random seismic response of bridge structures can be successfully researched. A long-span bridge structure is taken as an example. The probabilistic information of the response of a long-span bridge structure in different control under earthquake excitations is investigated. The investigation provides a new approach to the random seismic response analysis of long-span bridge structures.

Influence of Transient and Partial Footing Separation on the Seismic Response of Skewed Bridges with Soil Support

2021 ◽  
pp. 2150132
Author(s):  
Ziqi Yang ◽  
Chern Kun ◽  
Dongliang Meng ◽  
Nawawi Chouw
Keyword(s):  
Seismic Response ◽  
Large Scale ◽  
Bending Moment ◽  
Bridge Piers ◽  
Seismic Load ◽  
Skew Angle ◽  
Skewed Bridges ◽  
Design Spectrum ◽  
Bridge Structures ◽  
The Impact

Previous research has shown that the transient and partial footing separation is one of the effective methods to reduce the impact of earthquakes on bridge structures. The separation will not only temporarily stop the transfer of seismic load to structures, but also activate rigid-like body motions of the bridge piers. Most of current investigations involving footing uplift only focused on straight bridges. The influence of skew angle is rarely considered. Even though skewed bridges are common and more vulnerable to seismic load. This work reveals the simultaneous influence of skew angle and footing uplift on soil on seismic response of bridges. A bridge with a 30∘ or 45∘ skew angle, in addition to a straight bridge, was excited using a large-scale shake table. The ground excitations were stochastically simulated based on design spectrum of New Zealand standard. The result revealed that with increasing skew angle bridges will have frequent footing uplifts. In the case of a straight bridge, although allowing footing uplift is beneficial in reducing the bending moment at the pier support, it increases the longitudinal girder displacement. In contrast, in the case of 30∘ and 45∘ skewed bridges, uplifts increase the bending moments of piers and the displacements of the girder, especially in the transverse direction.

scholarly journals Effect of Masonry Infill Panels on the Seismic Response of Reinforced Concrete Frame Structures

2021 ◽  
Vol 7 (11) ◽  
pp. 1853-1867
Author(s):  
Ali Zine ◽  
Abdelkrim Kadid ◽  
Abdallah Zatar
Keyword(s):  
Reinforced Concrete ◽  
Seismic Response ◽  
Pushover Analysis ◽  
Reinforced Concrete Frame ◽  
Masonry Infill ◽  
Concrete Frame ◽  
Capacity Curves ◽  
Infill Panels ◽  
Highly Nonlinear ◽  
Non Linear

The present work concerns the numerical investigation of reinforced concrete frame buildings containing masonry infill panel under seismic loading that are widely used even in high seismicity areas. In seismic zones, these frames with masonry infill panels are generally considered as higher earthquake risk buildings. As a result there is a growing need to evaluate their level of seismic performance. The numerical modelling of infilled frames structures is a complex task, as they exhibit highly nonlinear inelastic behaviour, due to the interaction of the masonry infill panel and the surrounding frame. The available modelling approaches for masonry infill can be grouped into two principal types; Micro models and Macro models. A two dimensional model of the structure is used to carry out non-linear static analysis. Beams and columns are modelled as non-linear with lumped plasticity where the hinges are concentrated at both ends of the beams and the columns. This study is based on structures with design and detailing characteristics typical of Algerian construction model. In this regard, a non-linear pushover analysis has been conducted on three considered structures, of two, four and eight stories. Each structure is analysed as a bare frame and with two different infill configurations (totally infilled, and partially infilled). The main results that can be obtained from a pushover analysis are the capacity curves and the distribution of plastic hinges in structures. The addition of infill walls results in an increase in both the rigidity and strength of the structures. The results indicate that the presence of non-structural masonry infills can significantly modify the seismic response of reinforced concrete "frames". The initial rigidity and strength of the fully filled frame are considerably improved and the patterns of the hinges are influenced by structural elements type depending on the dynamic characteristics of the structures. Doi: 10.28991/cej-2021-03091764 Full Text: PDF

scholarly journals The Influence of Trains on the Seismic Response of Simply-Supported Beam Bridges with Different Pier Heights Expressed through a Safety Factor

2021 ◽  
Author(s):  
Lizhong Jiang ◽  
Kang Peng ◽  
Jian Yu ◽  
Wangbao Zhou ◽  
Yongjian Zuo
Keyword(s):  
Seismic Response ◽  
Safety Factor ◽  
High Speed ◽  
Dynamic Effect ◽  
Track Structure ◽  
Simply Supported Beam ◽  
Simply Supported ◽  
Bridge Structures ◽  
Track Bridge ◽  
Bridge System

Abstract With the extension of high-speed railways to high-intensity earthquake regions, it is impossible to avoid structural vibrations due to the joint action of trains and earthquakes. Therefore, it is of great significance to study the influence trains on bridge structures exposed to earthquakes. In this paper, a coupled finite element analysis model of a high-speed railway vehicle-bridge was established by considering a simply-supported beam bridge with the China Railway Track System (CRTS) II plate and the CRH2C high-speed train. The correctness of the model was experimentally verified. By considering the ground motion randomness, the influence of the train on the response of the bridge structure exposed to an earthquake was analyzed. Also, the influence level of the running train on the seismic response of bridge structures with different pier heights was studied. The results revealed that the train dynamic effect significantly reduced seismic responses of piers and supports, and that the effect itself decreased with the pier height increase. Furthermore, the dynamic effect of the train increased the seismic response of the track structure, while the bridge pier height had little influence on the dynamic efficiency of the track structure. For different pier heights, the probability distribution model of the train dynamic effect for the track-bridge system seismic response was considered as the normal distribution. This indicated that the seismic response of the track-bridge system under vehicle condition could be simplified as the product of the seismic response and safety factor under no vehicle condition.

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