Papers by Pennung Warnitchai
Buildings, Mar 2, 2023
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Journal of Earthquake and Tsunami, 2017
Shear wave velocity ([Formula: see text]) through the uppermost subsurface (30 m) is usually cons... more Shear wave velocity ([Formula: see text]) through the uppermost subsurface (30 m) is usually considered an important parameter as it dictates the dynamic behavior of soil and also acts as an input parameter for site response analysis, seismic hazard analysis, and site classification. In majority of seismically active areas across the globe, especially in developing countries like Pakistan, the [Formula: see text] measurements are either not available or if available, they are very limited in number to develop a seismic site-conditions map. In the absence of proper geological studies and geotechnical investigation, the slope-derived method provides a simple solution to map the site-conditions. The current study presents the development of slope-derived [Formula: see text] map on the basis of a correlation between [Formula: see text] and topographic slope for active tectonic regions and its comparison with the [Formula: see text] values at various locations in Pakistan. The topographi...
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Jsme International Journal Series A-solid Mechanics and Material Engineering, 1995
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World Academy of Science, Engineering and Technology, International Journal of Civil and Environmental Engineering, Feb 25, 2016
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Proceedings of the Thirteenth East Asia-Pacific Conference on Structural Engineering and Construction (EASEC-13), Sep 11, 2013
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Bulletin of Engineering Geology and the Environment, Jan 15, 2018
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Journal of Earthquake Engineering, Jan 10, 2017
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Engineering Structures, Jul 1, 2012
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Finite Elements in Analysis and Design, Apr 1, 2009
A simulation procedure for vehicle–substructure dynamic interactions and wheel movements is prese... more A simulation procedure for vehicle–substructure dynamic interactions and wheel movements is presented. The vehicles and substructure systems interact though wheel–rail interfaces satisfying two compatibilities, ie, the equilibrium of contact forces including a lateral creep ...
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Structural Design of Tall and Special Buildings, Dec 13, 2018
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Earthquake Engineering & Structural Dynamics, Jun 24, 2004
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Natural Hazards, May 11, 2020
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Smart Structures and Systems, Jan 25, 2006
The optimal design of multiple tuned mass dampers (multiple TMD`s) to suppress multi-mode structu... more The optimal design of multiple tuned mass dampers (multiple TMD`s) to suppress multi-mode structural response of beams and floor structures was investigated. A new method using a numerical optimizer, which can effectively handle a large number of design variables, was employed to search for both optimal placement and tuning of TMD`s for these structures under wide-band loading. The first design problem considered was vibration control of a simple beam using 10 TMD`s. The results confirmed that for structures with widelyspaced natural frequencies, multiple TMD`s can be adequately designed by treating each structural vibration mode as an equivalent SDOF system. Next, the control of a beam structure with two closely-spaced natural frequencies was investigated. The results showed that the most effective multiple TMD`s have their natural frequencies distributed over a range covering the two controlled structural frequencies and have low damping ratios. Moreover, a single TMD can also be made effective in controlling two modes with closely spaced frequencies by a newly identified control mechanism, but the effectiveness can be greatly impaired when the loading position changes. Finally, a realistic problem of a large floor structure with 5 closely spaced frequencies was presented. The acceleration responses at 5 positions on the floor excited by 3 wide-band forces were simultaneously suppressed using 10 TMD`s. The obtained multiple TMD`s were shown to be very effective and robust.
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Magazine of Concrete Research, Oct 1, 2016
This paper presents an application of precast, hybrid, moment-resisting frames for improving the ... more This paper presents an application of precast, hybrid, moment-resisting frames for improving the seismic safety of a standard five-storey residential building with a gravity-loaded, cast in situ reinforced concrete beam–column frame system. The non-linear mechanism of this new system is mainly governed by the opening and closing of discrete gaps at the interfaces of precast members. The improvement involved several research and development components, including quasi-static reversed cyclic loading tests, capacity design of hybrid frames, seismic performance evaluation of the entire building system using non-linear dynamic analysis, and cost comparisons of the original and proposed hybrid systems. Excellent seismic performance was demonstrated using each hybrid joint type; their force–deformation responses exhibited ductile stable hysteretic loops for up to 6% drift levels without severe damage. The hybrid frame building can withstand strong ground shaking (peak ground acceleration of 0·50g) without collapsing at minimal increased total cost (16·6%) compared with the cost of the original building.
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International journal of disaster risk reduction, Sep 1, 2017
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Advances in Structural Engineering, Oct 1, 2012
Two 3/5-scale models of bonded post-tensioned slab-column connections, one without drop panel and... more Two 3/5-scale models of bonded post-tensioned slab-column connections, one without drop panel and one with drop panel, were tested to failure. The study's goals were to: (1) develop information on the seismic performance of typical bonded post-tensioned slab-column connections; and (2) improve the seismic performance using a drop panel. A lateral quasi-static cyclic loading routine, simulating earthquake actions, was applied to the models' top columns. Overall performance was examined and compared in terms of lateral load-carrying capacity, maximum drift, stiffness, energy absorption, and failure mechanism. Relevant design equations suggested by ACI 318–08 Building Code provisions for preventing stress-induced and deformation-induced failures as well as previous similar tests by others were compared with test results. Results indicate that ACI provisions could be used for these connections, and the presence of a drop panel is an effective way to greatly enhance the overall performance of this type of connection.
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Earthquake Spectra, Dec 1, 2017
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Earthquake Engineering & Structural Dynamics, 2003
This paper presents an application of multiple tuned mass dampers (MTMDs) with non‐linear damping... more This paper presents an application of multiple tuned mass dampers (MTMDs) with non‐linear damping devices to suppress man‐induced vibrations of a 34m long pedestrian bridge. The damping force generated by each of these damping devices is simply a drag force from liquid acting on an immersed section. The quadratic non‐linear property of these devices was directly determined from free vibration tests of a simple laboratory set‐up. Dynamic models of the bridge and pedestrian loads were constructed for numerical investigation based on field measurement data. The control effectiveness of non‐linear MTMDs was examined along with its sensitivity against estimation errors in the bridge's natural frequency and magnitude of pedestrian load. The numerical results indicated that the optimum non‐linear MTMD system was as effective and robust as its linear counterpart. Then, a six‐unit non‐linear MTMD system was designed, constructed, and installed on the bridge. Field measurements after the installation confirmed the effectiveness of non‐linear MTMDs, and the measurement results were in good agreement with numerical predictions. After the installation, the average damping ratio of the bridge was raised from 0.005 to 0.036 and the maximum bridge accelerations measured during walking tests were reduced from about 0.80–1.30 ms−2 to 0.27–0.40 ms−2, which were within an acceptable range. Copyright © 2003 John Wiley & Sons, Ltd.
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Papers by Pennung Warnitchai