Evaluation of Strong Column Factors for RC Frames Based on Seismic Vulnerability Analysis

Augmenting the flexural strength of columns in the seismic design of reinforced concrete (RC) moment resisting frames is a key measure among all the detailing procedures of seismic capacity design, which induces the desirable beam side-sway mechanism for the structure to dissipate energy during a strong earthquake. The objective of this paper is to assess the influence of various strong column factors which is employed to perform seismic vulnerability analysis to the seismic performance of a six-story deterministic RC frame structure. Seismic vulnerability analyses indicate that augmenting the flexural strength of columns is an effective measure to improve seismic performance of RC frame structures. Increasing strong column factor improves the displacement capacity of structure and induces the biggish grads between the different damage limit states, which provide caution to prevent the abrupt collapse of structure during a strong earthquake. Seismic vulnerability curves provide the quantitative criterion for evaluating the seismic performance of structure and choosing appropriate target strong column factor.

Download Full-text

Seismic Vulnerability Analysis of Water Pipeline in Wenchuan Earthquake

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.109.290 ◽

2011 ◽

Vol 109 ◽

pp. 290-295

Author(s):

En Dong Guo ◽

Dan Yang ◽

Zhi Liu ◽

Zai Rong Wang

Keyword(s):

Wenchuan Earthquake ◽

Seismic Vulnerability ◽

Great Influence ◽

Seismic Damage ◽

Vulnerability Analysis ◽

Pipeline System ◽

Seismic Capacity ◽

Damage Characteristics ◽

Seismic Vulnerability Analysis ◽

Water Pipeline

The seismic damage and loss of service of pipeline engineering may have great influence on the society, so the seismic research of pipeline engineering had always been highly valued. In this paper, the seismic damage characteristics of pipeline and vulnerability of water pipeline system in Wenchuan earthquake are analyzed, some revelations have been presented. The seismic capacity of pipeline engineering in some towns and cities was not adequate, the pipeline systems suffered great losses in Wenchuan Earthquake, and effective seismic countermeasures should be considered in design and construction of water pipeline system in order to improve this situation.

Download Full-text

Feasibility Study of Using Engineered Cementitious Composite and High-Strength Bars in Rigid Bridge Piers Based on Seismic Vulnerability Analysis

Shock and Vibration ◽

10.1155/2020/8850800 ◽

2020 ◽

Vol 2020 ◽

pp. 1-11

Author(s):

Jie Li ◽

Yuanhong Hu ◽

Dayu Yang ◽

Tengda Feng ◽

Yan Liang ◽

...

Keyword(s):

Seismic Performance ◽

Seismic Vulnerability ◽

Plastic Hinge ◽

High Strength ◽

Vulnerability Analysis ◽

Bridge Piers ◽

Main Function ◽

Cementitious Composite ◽

Engineered Cementitious Composite ◽

Seismic Vulnerability Analysis

The main function of pier is to transmit the load from superstructure to foundation reliably. Under earthquake action, the main failure reason of bridge is the damage of bridge pier. The application of some high-performance materials is helpful to improve the seismic performance of bridge piers. Based on seismic vulnerability analysis, this paper studies the feasibility of using engineered cementitious composite (ECC) and high-strength bars in bridge piers. Taking a rigid pier as an example, a nonlinear numerical model is established by OpenSees software. The reasonable replacement height of ECC in plastic hinge regions, stirrup ratio of pier section, and replacement rate of high-strength bars are obtained through the seismic performance analysis of the pier. Then, seismic vulnerability of rigid pier with ECC and high-strength bars is analyzed. The results show that it is feasible to improve the seismic performance of the piers by using ECC and high-strength bars. Considering the economic rationality, the replacement height of ECC in plastic hinge regions can be determined according to the curvature change point. For the rigid pier, the economical and reasonable volume stirrup ratio is 0.78%. The ultimate curvature of RC/ECC pier bottom increases by 12.4% when the longitudinal bars of the pier are replaced by high-strength bars, and the energy dissipation capacity increases by 22.5% on average. Compared with the pier’s original design, the exceedance probability of each limit state of the rigid pier with ECC and high-strength bars is significantly reduced. Its seismic performance is superior, and the risk of seismic damage is significantly reduced.

Download Full-text

SEISMIC CAPACITY OF MEDIUM SIZE CONTINUOUS BRIDGES WITH LEAD-RUBBER BEARINGS

NED University Journal of Research ◽

10.35453/nedjr-stmech-2019-0091 ◽

2019 ◽

Vol 3 (Special Issue on First SACEE'19) ◽

pp. 199-206

Author(s):

Bertha Olmos ◽

José Jara ◽

José Luis Fabián

Keyword(s):

Seismic Performance ◽

Seismic Vulnerability ◽

Base Isolation ◽

Elastic Behaviour ◽

Medium Size ◽

Nonlinear Behaviour ◽

Seismic Capacity ◽

Damage Scenarios ◽

Isolation Systems ◽

Rubber Bearings

This paper investigates the effects of the nonlinear behaviour of isolation pads on the seismic capacity of bridges to identify the parameters of base isolation systems that can be used to improve seismic performance of bridges. A parametric study was conducted by designing a set of bridges for three different soil types and varying the number of spans, span lengths, and pier heights. The seismic responses (acceleration, displacement and pier seismic forces) were evaluated for two structural models. The first model corresponded to the bridges supported on elastomeric bearings with linear elastic behaviour and the second model simulated a base isolated bridge that accounts for the nonlinear behaviour of the system. The seismic demand was represented with a group of twelve real accelerograms recorded on the subduction zone on the Pacific Coast of Mexico. The nonlinear responses under different damage scenarios for the bridges included in the presented study were estimated. These results allow determining the seismic capacity of the bridges with and without base isolation. Results show clearly the importance of considering the nonlinear behaviour on the seismic performance of bridges and the influence of base isolation on the seismic vulnerability of medium size bridges.

Download Full-text