scholarly journals Improving Torsional Rigidity and Seismic Performance of Tunnel Form Building Structures

2017 ◽  
Vol 3 (3) ◽  
pp. 124-134
Author(s):  
Can Balkaya ◽  
Ihsan Karagoz ◽  
Ismihan Gunal
Keyword(s):  
Seismic Performance ◽  
Torsional Rigidity ◽  
Building Structures

scholarly journals Special Issue on Advanced Methods for Seismic Performance Evaluation of Building Structures

2020 ◽  
Vol 10 (20) ◽  
pp. 7353
Author(s):  
Sang Whan Han
Keyword(s):  
Performance Evaluation ◽  
Seismic Performance ◽  
Building Structures ◽  
Special Issue ◽  
Large Area ◽  
Seismic Performance Evaluation ◽  
Seismic Engineering ◽  
Seismic Regions ◽  
Moderate Seismic Regions ◽  
Great Damage

When an earthquake occurs, it causes great damage to a large area. Although seismic engineering continues to develop, it is reported that recently occurred earthquakes inflicted major damage to various structures and loss of human lives. Such earthquake damage occurs in high seismic regions as well as low to moderate seismic regions. This special issue contains topics on newly developed technologies and methods for seismic performance evaluation and seismic design of building structures.

scholarly journals A New Method to Evaluate the Post-Earthquake Performance and Safety of Reinforced Concrete Structural Frame Systems

2020 ◽  
Vol 5 (2) ◽  
pp. 16
Author(s):  
Foteini Konstandakopoulou ◽  
George Hatzigeorgiou ◽  
Konstantinos Evangelinos ◽  
Thomas Tsalis ◽  
Ioannis Nikolaou
Keyword(s):  
Reinforced Concrete ◽  
Seismic Performance ◽  
Structural Parameters ◽  
Permanent Deformation ◽  
Nonlinear Behavior ◽  
Building Structures ◽  
Reinforced Concrete Buildings ◽  
Concrete Buildings ◽  
Residual Displacements ◽  
Seismic Displacements

This study examines the relation between maximum seismic displacements and residual displacements for reinforced concrete building structures. In order to achieve a reliable relationship between these critical structural parameters for the seismic performance of concrete buildings, an extensive parametric study is conducted by examining the nonlinear behavior of numerous planar framed structures. In this work, dynamic inelastic analyses are executed to investigate the seismic behavior of two sets of frames. The first group consists of four planar frames which have been designed for seismic and vertical loads according to modern structural codes while the second group also consists of four frames, which have been designed for vertical loads only, in order to examine older structures that have been designed using codes with inadequate seismic provisions. These two sets of buildings are subjected to various earthquakes with different amplitudes in order to develop a large structural response databank. On the basis of this wide-ranging parametric investigation, after an appropriate statistical analysis, simple empirical expressions are proposed for a straightforward and efficient evaluation of maximum seismic displacements of reinforced concrete buildings structures from their permanent deformation. Permanent displacements can be measured in-situ after strong ground motions as a post-earthquake assessment. It can be concluded that the measure of permanent deformation can be efficiently used to estimate the post-seismic performance level of reinforced concrete buildings.

Seismic Performance of Asymmetric Building Structures

2020 ◽  
Author(s):  
Chunwei Zhang ◽  
Zeshan Alam ◽  
Li Sun ◽  
Bijan Samali
Keyword(s):  
Seismic Performance ◽  
Building Structures ◽  
Asymmetric Building

Seismic Testing of In-Plane Flexural Damper in Arched-Shape

2014 ◽  
Vol 1065-1069 ◽  
pp. 1117-1120
Author(s):  
Chia Shang Chang Chien ◽  
Wei Yuan Wang ◽  
Ging Huei Huang ◽  
Yen Po Wang
Keyword(s):  
Seismic Performance ◽  
Performance Test ◽  
Shaking Table ◽  
Building Structures ◽  
Earthquake Intensity ◽  
Seismic Damper ◽  
Modal Damping ◽  
Component Test ◽  
Out Of Plane ◽  
Material Utilization

This study proposes an innovative displacement-dependent metallic yielding damper for seismic protection of building structures. The damper is designed to deform inelastically under in-plane flexural bending and becomes energy-dissipative with an improved efficiency in terms of material utilization, as compared with those designed to bend in an out-of-plane manner. Both component test and seismic performance test of the proposed damper have been conducted in this study. Hysteresis of the component test indicates consistent and effective energy-dissipative characteristics of the damper. The contour of cracks on the surface of the damper after testing is well correlated with the stress distribution obtained from numerical analysis. Moreover, excellent seismic performance of the proposed in-plane arched damper has been demonstrated via a series of shaking table tests on a five-story model structure. Experimental results indicate that, with the dampers implemented, the acceleration responses in both peak and root-mean-squares of all floors are significantly reduced and more pronounced with the earthquake intensity increased. Effectiveness of the seismic damper is also revealed from the increase of the effective modal damping of all modes identified.

scholarly journals Effect of Irregularities on Seismic Performance of Buildings– A Review

2020 ◽  
Vol 5 (3) ◽  
pp. 56-65
Author(s):  
Ishita Verma ◽  
◽  
Shobha Ram ◽  
M. K. Bhardwaj ◽  
Nirendra Dev ◽  
...  
Keyword(s):  
Uniform Distribution ◽  
Seismic Performance ◽  
Seismic Events ◽  
Earthquake Activity ◽  
Building Structures ◽  
Code Of Practice ◽  
Intended Purpose ◽  
Standard Code ◽  
Irregular Buildings

Building structures are subjected to vibrations due to earthquake activity. There are many characteristics that induce irregularities in buildings. Apart from other reasons, these irregularities may be; many times; due to non-uniform distribution of mass, stiffness, or strength in the structure of the building. Due to such irregularities; buildings are subjected to some undesirable effects which make them weaker compared to regular buildings. Indian Standard code of practice IS 1893 – (Part 1): 2016 [1] details guidelines to be followed so that buildings are less and less irregular. Many times such guidelines may be the result of past studies of actual performances of buildings in seismic events. It is the intended purpose of this paper to bring a review of standard guidelines which are important for irregular buildings for preventing various typical damages to occur in seismic conditions. Typical examples of past damages have been provided to draw lessons.

A Critical Comparison of Seismic Qualification Requirements for Safety Equipment in Various Codes and Standards

2003 ◽  
Author(s):  
F. G. Abatt ◽  
Quazi Hossain ◽  
Milon Meyer
Keyword(s):  
Seismic Performance ◽  
Seismic Design ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Lower Class ◽  
Department Of Energy ◽  
Building Structures ◽  
Performance Category ◽  
Code Provisions

Evaluation of life safety risks to facility occupants, public, and the environment that may result from earthquake events involves both building structures and equipment supported from these structures. But, it is the seismic design of building structures that typically receive the bulk of the attention from the code committees of the national professional organizations and the regulatory authorities. For safety related equipment in nuclear facilities (e.g., Seismic Category I equipment in nuclear power plants and Seismic Performance Category 3 and 4 equipment in the Department of Energy facilities), the seismic design and analysis guidelines and acceptance criteria are well established. But, for Nonseismic Category equipment in nuclear power plants and Seismic Performance Category 1 and 2 equipment in Department of Energy facilities, these have not yet been developed to the same level of completeness and rigor. The code provisions and guidelines available today for these lower class/categories of equipment are briefly, but critically discussed here, along with a comparison of the results of the application of these code provisions.

AN EXPERIMENTAL STUDY OF IN-PLANE, ARCH-SHAPED FLEXURAL DAMPER

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Yen-Po Wang ◽  
Di-Hung Chen ◽  
Chien-Liang Lee
Keyword(s):  
Experimental Study ◽  
Stress Concentration ◽  
Seismic Performance ◽  
Shaking Table ◽  
Seismic Protection ◽  
Building Structures ◽  
Shaking Table Tests ◽  
Earthquake Intensity ◽  
Component Test ◽  
Portal Frame

An innovative displacement-dependent metallic yielding damper designed to deform inelastically under in-plane flexural bending for seismic protection of building structures is proposed. The in-plane flexural damper that originated from a portal frame is modified by replacing the beam with a circular arch so that the effect of stress concentration can be minimized. Component tests of the in-plane dampers were conducted and compared with analytical results. Hysteresis of the component test indicates a consistent energy-dissipative characteristic of the damper. Moreover, seismic performance of the proposed damper via a series of shaking table tests was carried out. Excellent seismic performance of the proposed in-plane arched damper was observed. The acceleration responses in both peak and root-mean-squares of all floors are significantly reduced, and were greater in extent compared to the earthquake intensity increases.

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