Quantitative assessment of seismic design provisions for buildings with torsional irregularities

2020 ◽  
pp. 875529302097096
Author(s):  
D Jared DeBock ◽  
Michael Valley ◽  
Conrad (Sandy) Hohener
Keyword(s):  
Seismic Design ◽  
Large Range ◽  
Response Spectrum ◽  
Response Spectrum Analysis ◽  
Collapse Resistance ◽  
Lateral Resistance ◽  
Earthquake Force ◽  
Design Requirements ◽  
Torsionally Flexible ◽  
Design Earthquake

ASCE/SEI 7 design requirements for seismic-induced torsion in buildings are evaluated to determine their effectiveness for resisting seismic-induced collapse of torsionally irregular buildings. The ASCE/SEI 7-16 provisions are found to be generally conservative for most torsionally irregular building configurations—exceptions are some buildings that rely heavily on lines of lateral resistance orthogonal to the design earthquake force to resist torsional moments, and also some torsionally flexible buildings designed using modal response spectrum analysis. Modifications to provide better consistency in collapse resistance over a large range of building configurations and degrees of torsional irregularity are recommended. The study also demonstrates that buildings classified as extremely torsionally irregular may not need to be prohibited from Seismic Design Categories E and F, as long as the lateral system is proportioned properly.

Theoretical Analysis of Seismic Response for Marine Drilling Risers

2013 ◽  
Vol 423-426 ◽  
pp. 1531-1536 ◽  
Author(s):  
Jun Qiang Li ◽  
Yi Fan Li ◽  
Yong Peng
Keyword(s):  
Seismic Design ◽  
Response Spectrum ◽  
Bending Moment ◽  
Continuous System ◽  
Oil Industry ◽  
Offshore Drilling ◽  
Earthquake Force ◽  
Drilling Engineering ◽  
Internal Forces ◽  
Earthquake Action

With the continuous development of the marine oil industry, risers have become necessary equipment in offshore drilling engineering. On the basis of mode-superposition response spectrum method which is used commonly in anti-seismic design, the seismic responses of the marine drilling riser is analyzed on the theoretical and the related anti-seismic calculation formulas of the discrete system are promoted to the continuous system. The earthquake force and the resultant internal forces when the earthquake happening are analyzed and calculated. The calculation formulas of shear force and bending moment for each cross section of a riser under the earthquake action are deduced, which can offers some theoretical reference for riser engineering design when considering earthquake action.

scholarly journals Bridge construction cost saving from using LRB (Lead Rubber Bearing) in the area prone to earthquake, Kenteng bridge case study

2020 ◽  
Vol 156 ◽  
pp. 05018
Author(s):  
Ariono Dhanis ◽  
Herdianto Arifin ◽  
Iwan Zarkasi
Keyword(s):  
Response Spectrum ◽  
Construction Cost ◽  
Bridge Structure ◽  
Response Spectrum Analysis ◽  
Rubber Bearing ◽  
Lead Rubber Bearing ◽  
Sliding Isolation ◽  
Earthquake Force ◽  
Prone Area

There are many ways to reduce the earthquake force excited in the bridge structure, such as the use of Lead Rubber Bearing, Sliding Isolation Pendulum, and Damper/Lock Up Device. The concern that described in this paper is Lead Rubber Bearing support to damp earthquake thrust above the pier. The declared by the manufacturer guarantee is that the LRB can weaken the shock for about 30%. The analysis executed here is a response spectrum analysis calculating the natural frequency of the bridge. The contractual cost of the structure (with LRB structure) with the non-LRB structure were compared. We did not compare in terms of reinforced concrete volume reduction because the price of the LRB each and the price of the concrete with rebar per m3 are different. From the analysis, it is shown that without LRB, the price of the bridge will be increased at 19% from the original contractual price (before tax) or 16% saving. From this point, it is important to use LRB in our earthquake-prone area as the conclusion.

Structure Seismic Analysis on Intake Tower of Spillway Tunnel

2014 ◽  
Vol 1065-1069 ◽  
pp. 1427-1432
Author(s):  
Yi Zhi Yan ◽  
Chang Xin Xiong ◽  
Xiao Cheng Wen ◽  
Wei Hong Li
Keyword(s):  
Seismic Design ◽  
Dynamic Stress ◽  
Seismic Analysis ◽  
Response Spectrum ◽  
Element Model ◽  
Original Design ◽  
Seismic Parameters ◽  
Tower Structure ◽  
Design Requirements ◽  
Spillway Tunnel

According to a intake tower of spillway tunnel established the intake tower structure—water—foundation 3-D finite element model for seismic analysis, by the response spectrum method in original design seismic parameters and new parameters of the project on horizontal and vertical dynamic response of the intake tower. The results shown that the structure of maximum dynamic stress concentration appeared near the junction of the tower with backfill concrete, where the weak parts of seismic, used the new seismic parameters calculated show greater damage on the tower, but couldn’t overturn, meet the seismic design requirements.

scholarly journals Lateral resistance of mass timber shear wall connected by withdrawal-type connectors

2021 ◽  
Vol 67 (1) ◽  
Author(s):  
Sung-Jun Pang ◽  
Kyung-Sun Ahn ◽  
Seog Goo Kang ◽  
Jung-Kwon Oh
Keyword(s):  
Experimental Data ◽  
Seismic Design ◽  
Shear Walls ◽  
Shear Wall ◽  
Vertical Load ◽  
Lateral Resistance ◽  
Kinematic Models ◽  
Mass Timber ◽  
Timber Shear Walls ◽  
Timber Shear Wall

AbstractIn this study, the lateral resistances of mass timber shear walls were investigated for seismic design. The lateral resistances were predicted by kinematic models with mechanical properties of connectors, and compared with experimental data. Four out of 7 shear wall specimens consisted of a single Ply-lam panel and withdrawal-type connectors. Three out of 7 shear wall specimens consisted of two panels made by dividing a single panel in half. The divided panels were connected by 2 or 4 connectors like a single panel before being divided. The applied vertical load was 0, 24, or 120 kN, and the number of connectors for connecting the Ply-lam wall-to-floor was 2 or 4. As a result, the tested data were 6.3 to 52.7% higher than the predicted value by kinematic models, and it means that the lateral resistance can be designed by the behavior of the connector, and the prediction will be safe. The effects of wall-to-wall connectors, wall-to-floor connectors and vertical loads on the shear wall were analyzed with the experimental data.

Analysis on Seismic Performance of Beam and Plate Converter Floor

2014 ◽  
Vol 580-583 ◽  
pp. 1551-1554
Author(s):  
Gen Tian Zhao ◽  
Xu Ting Kou
Keyword(s):  
Seismic Performance ◽  
Seismic Design ◽  
Structure Calculation ◽  
High Rise ◽  
High Rise Building ◽  
Design Requirements

With the project case, the seismic performance of girder transfer floor member and the plate transfer floor member were discussed. Contrast calculation was carried out in girder transfer floor member and the plate transfer floor member with SATWE method to analyze its reasonable and unreasonable places. Based on overall structure calculation of a high rise building, the seismic design requirements for buildings applying thick transferring plate have been presented. The conclusion is that the seismic performance of girder transfer floor member is more advantageous and affordable, more convenient and more economical in ingredients.

Earthquake Damage and Design Requirement of Stair in Frame Structure

2013 ◽  
Vol 438-439 ◽  
pp. 1461-1465 ◽  
Author(s):  
Yuan Bing Cheng ◽  
Kang Wang ◽  
Yong Qiang Ren
Keyword(s):  
Seismic Design ◽  
Earthquake Damage ◽  
Frame Structure ◽  
Seismic Load ◽  
Specific Calculation ◽  
Rescue Work ◽  
Design Requirements ◽  
Serious Injury ◽  
Death Investigation ◽  
Current Code

In building structure, staircase is more complex and relatively weak. As an important emergency routes when earthquakes and other emergencies (such as fire, explosion, etc.) take place, stairs subject highly evacuation live or seismic load, destruction of the stair caused delay of evacuation and affected the commencement of rescue work, and produced serious injury or death. Investigation of Wenchuan earthquake damage also finds that many stairs broken before the main structure. In the current code for seismic designof building, seismic design advice of stairs was only given instructionally, and specific calculation methods and construction requirements were lacked. Based on the analysis of earthquake destroy of stairs in frame structure, this paper proposes some design requirements of stair.

Comparison of eigenanalysis and Ritz vector approaches for response spectrum analysis of soil-pile-bridge systems

2021 ◽  
Vol 17 (3-4) ◽  
pp. 89-100
Author(s):  
M. Davidson ◽  
A. Patil ◽  
S.A. Rosenfeld ◽  
Z. Zhu
Keyword(s):  
Spectrum Analysis ◽  
Soil Structure ◽  
Response Spectrum ◽  
Active Regions ◽  
Ritz Vector ◽  
Response Spectrum Analysis ◽  
Fixed Base ◽  
Potential Benefits ◽  
Eigenvectors And Eigenvalues ◽  
Vector Approach

Frequency-based analysis techniques such as response spectrum analysis (RSA) are widely used for designing bridges in seismically active regions. Two well-known analysis procedures that underlie RSA are the solution of the eigenproblem and the approximation of the solution to the eigenproblem (i.e., approximation of eigenvectors and eigenvalues) through use of force-dependent Ritz vectors. While frequency-based methods have achieved widespread adoption in practice, certain simplifications remain common, such as neglecting soil-structure interaction (SSI) due to a fixed-base assumption. In the present study, frequency-based techniques packaged within a research version of a design-oriented computational tool are employed to analyze, assess, and compare results obtained from RSA with use of the eigenanalysis, and separately, Ritz vector approaches. Importantly, for the bridge configurations analyzed, SSI is taken into account. As outcomes, the potential benefits of the Ritz vector approach (as well as modeling strategies) are demonstrated. The study outcomes are intended to aid practicing engineers when the need to account for SSI is recognized as pertinent to a given bridge seismic design application.

Sign in / Sign up

Export Citation Format

Share Document