Bi-linear displacement response spectrum model for engineering applications in low and moderate seismicity regions

Lumantarna, Elisa; Wilson, John L.; Lam, Nelson

doi:10.1016/j.soildyn.2012.07.006

Cited by 19 publications

(10 citation statements)

References 26 publications

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“…Recommended values of RSD max for a range of magnitude-distance combinations that are consistent with conditions of moderate ground shaking which was derived by the authors in Lumantarna et al [2012] are presented in Table 2 …”

Section: Displacement-controlled Behavior Of Buildings Responding Witmentioning

confidence: 59%

Displacement-Controlled Behavior of Asymmetrical Single-Story Building Models

Lumantarna

Lam

Wilson

2013

Journal of Earthquake Engineering

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Displacement controlled behavior is a feature of low to moderate seismicity areas where the peak displacement demand on structures could be limited despite significant structural strength and stiffness degradation. In this article, the extension of the displacement controlled phenomenon to torsionally unbalanced framing systems is investigated. It is shown that the displacement demand of critical elements within a building can be insensitive to changes in eccentricity and torsional stiffness properties. While torsional actions is a well-researched topic, the incorporation of displacement controlled phenomenon into the analysis is original and represents a new development.

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Section: Displacement-controlled Behavior Of Buildings Responding Witmentioning

confidence: 59%

Displacement-Controlled Behavior of Asymmetrical Single-Story Building Models

Lumantarna

Lam

Wilson

2013

Journal of Earthquake Engineering

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“…It is known that the spectral ordinates for all damping levels increase with the period from zero to some maximum value and then descend to converge at the value of the peak ground displacement at long periods (Bommer & Elnashai, 1999). Lumantarna et al (2012) divides the response spectrum into three regions, based on the sensitivity of the acceleration, velocity and displacements, as seen in Figure (Lumantarna, et al, 2012) Examples of response spectrum acceleration, velocity and displacement sensitivity for this study are shown in Figure V-7 below. The rests are in the Appendix 4.…”

Section: Time (Sec)mentioning

confidence: 99%

Behaviour of integral bridges under vertical and horizontal earthquake ground motion

Masrilayanti¹,

Weekes²

2014

Bridge Maintenance, Safety, Management and Life Extension

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Integral bridges are monolithic and are known to possess good earthquake resistance when founded on a stable soil. One important consideration is the relative displacements which can occur at the support points on structures where there is significant spacing between, i.e. bridges. Factors such as soil, foundation types etc. can all influence the dynamic response, and the stiffness of the bridge can influence how relative displacements affect the internal force actions within the structure. In this study, the effect of earthquakes on integral bridges built on several different soil types is examined, through computer simulation of an integral abutment bridge. The study is made based on Eurocode 8 recommendations, which provides data for different types of soil to be used for earthquake analysis. A symmetrical medium length integral bridge obtained from an existing structure is used for the analysis. Artificial EC8 spectrum compatible time histories (with a 0.35 g peak ground acceleration) are applied to the structure for a range of soil stiffnesses. In conjunction with this, both static and dynamic relative displacement studies are carried out to develop insight as to the significance or dominance of either dynamic or relative displacement effects.The final aim of this study is to propose a simplified approach for design/appraisal which can allow predictions of dynamic response based on the results of static relative displacement studies coupled with simple computer models, without having to resort to full nonlinear integration time-history analysis. Synthetic time histories for 5 different types of soil were created using Mathcad. The synthetic acceleration time history was validated using Seismospect (by Seismosoft). The time histories were then used to carry our full integration time history analyses in ANSYS (engineering simulation software) to simulate the dynamic response of the bridge.The results show that relative displacements play an important role in overall structural response of the integral bridge, compared to the pure dynamic response. The results also confirm that lower stiffness soils suffer a more detrimental effect of the earthquake compared to a soil of higher stiffness.

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“…It is demonstrated in Lumantarna, Wilson, and Lam (2012) citing the original publication by Lam et al (2000) that in the context of local intraplate earthquakes, the value of RSD max can be estimated using the following equation once the value of RSV max and the moment magnitude of the earthquake is known:…”

Section: Construction Of Response Spectrum For Rock Sitesmentioning

confidence: 99%

“…For moment magnitude equal to 6, the value of T 2 may be taken as 1.25 s as per predictions by model that has been verified in Lumantarna, Wilson, and Lam (2012). Thus, the value of RSD max on rock is estimated to be equal to 24 mm (D 120 £ 1.25/2p/: It can be shown in Equations (5a) and (5b) that the relationship between RSA at the high period range of the response spectrum and the RSD can be derived by considering the dynamic equilibrium of forces in a linear elastic SDOF system:…”

Section: Construction Of Response Spectrum For Rock Sitesmentioning

confidence: 99%

Local intraplate earthquake considerations for Singapore

Lam

Tsang

Lumantarna

et al. 2014

The IES Journal Part A: Civil & Structural Engineering

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The current National Annex for Singapore to Eurocode 8 is primarily to address distant hazards from Sumatra and is not intended to provide coverage for potential local intraplate hazards. The latter type of hazards has safety implications on low-rise structures including many of the aged building construction. It is argued that the absence of local seismic activities in the recorded history within the Malaysian peninsular cannot be used as evidence to justify the assumption that its level of potential local hazards is any lower than other intraplate regions such as Australia, Southern India, and Central and Eastern United States, because of the relative smallness of the landmass of the peninsular. This paper presents a response spectrum model for intraplate earthquakes using relevant data from other regions around the world as opposed to relying on very limited amount of data from regional monitoring. Finally, a response spectrum model that takes into account potential threats from both distant and local seismic sources is recommended for future adoption by Singapore.

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Bi-linear displacement response spectrum model for engineering applications in low and moderate seismicity regions

Cited by 19 publications

References 26 publications

Displacement-Controlled Behavior of Asymmetrical Single-Story Building Models

Displacement-Controlled Behavior of Asymmetrical Single-Story Building Models

Behaviour of integral bridges under vertical and horizontal earthquake ground motion

Local intraplate earthquake considerations for Singapore

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