Consulting

Consulting Services

Services

  • Engineering design and consultant

          a) Precast Segmental Bridge Design and Analysis

             Option: Span by Span Construction, Balanced Cantilever Construction

          b) Design and Analysis of Extradosed Bridge

          c) Investigation of Crack Behavior of Segmental Box Girder by Nonlinear FEA

          d) Pre-Camber Calculation for Construction Stage of Bridges

          e) Highrise Building Design and Analysis

  • Value engineering consultant
  • Earthquake early warning system and solution consultant
  • Building and bridge monitoring consultant
  • Forensic engineering consultant
  • Building and industrial automation solution consultant
  • Technology consultant and solution consultant
  • Engineering and technology training and consultant
       For more info and inquiries regarding to consulting activities and services, please contact me here. Both consulting and engineering services are available for both domestic and international projects.
 
       As listed below, the examples of selected consulting activities during my professional career.

Crack Propagation and Damage Investigation of Cable Stayed Pylon

posted Jun 22, 2015, 9:01 AM by Domain Admin   [ updated Jun 22, 2015, 9:05 AM ]

After 10 years opening to normal traffic, the cable stayed bridge is subjected to visible cracks near the anchorage zone of pylon. The author is involved the field investigation of crack identification, pattern, and propagation. The visual inspection and the advance nonlinear finite element analysis are performed to find out the causes for the cracks.

The 2D and 3D Finite Element Analysis considering nonlinear mechanics of cracked reinforced concrete is performed. The accurate geometry, dimension, reinforcement, including prestressing bars are included in the model based on the as-built drawings. The model is calibrated by using the global nonlinear construction stage analysis of the bridge with the field load test. The result of crack propagation reviews the causes of the damage relating to the different relaxation of cable forces acting on the pylon wall. The repair of the structure is suggested and produced as the drawing for the owner.













Nonlinear Finite Element Analysis of Rama 8 Cable Stayed Bridge for Health Monitoring System.

posted Aug 12, 2014, 1:07 AM by Domain Admin   [ updated Aug 12, 2014, 1:19 AM ]

The Rama VIII Bridge is a cable-stayed bridge crossing the Chao Phraya River in BangkokThailand. It was conceived to alleviate traffic congestion on the nearby Phra Pinklao Bridge. Construction of the bridge took place from 1999 to 2002. The bridge was opened on 7 May 2002 and inaugurated on 20 September, which is the birth anniversary of the late King Ananda Mahidol (Rama VIII), after whom it is named. The bridge has an asymmetrical design, with a single pylon in an inverted Y shape located on the western bank of the river. Its eighty-four cables are arranged in pairs on the side of the main span and in a single row on the other. The bridge has a main span of 300 metres (980 ft), and was one of the world's largest asymmetrical cable-stayed bridges at the time of its completion.



Due to the working period of the bridge is nearly 10 years after the construction, the bridge inspection and health monitoring system including the detailed assessment of the bridge under the normal traffic and seismic hazards are required. For the purposes of detailed assessment of the bridge subjected to earthquake and the new traffic design load (HL-93), the bridge is analyzed using the full 3D finite element analysis. The calibrated FE models consider the effects of construction sequences from As-Built drawings, damages of structural components from the field inspections, the natural periods and mode shapes measured from the field using controlled and ambient vibration tests, the cable forces in the model are adjusted based on the measured cable forces using the nonlinear optimization scheme.

The calibrated model is then adopted for nonlinear time history analysis where the series of ground motions are scaled to the new Thailand seismic map (มยผ. 1302) and the existing AASHTO seismic response spectrum curve with 0.1g acceleration level.

Investigation of the Collapse of Parking Structure of the Tropicana Casino and Resort

posted Oct 14, 2009, 11:51 PM by Domain Admin   [ updated Sep 28, 2012, 8:52 PM ]


On October 30, 2003, several floors collapsed of a parking structure that was under construction at the Tropicana Casino and Resort in Atlantic City, New Jersey. As part of the investigation of the collapse, large non-linear finite element analyses were conducted by Construction Technologies Laboratory (CTL) using the software package DIANA. At the request of a law firm representing one of the defendants, I and Prof. Kuchma completed an independent review of the results of the DIANA analyses. We also conducted additional analyses using other analysis programs. This investigation involved the review of existing reports on the collapse, testimonies, and laboratory test results to assess if the completed analyses could capture the distribution of forces in the region of the collapse and the expected mode of failure.

More information of the collapse of the parking structure is provided here.

Assessment of Seismic Performance of the 32 Storeys Residential Buildings and Parking Structure (November 2009 – December 2009)

posted Oct 14, 2009, 11:50 PM by Domain Admin   [ updated Sep 30, 2012, 10:03 AM ]



The residential building designed to be three buildings fully connected. The buildings are the 32 storeys “L” shaped and “T” shaped towers and a 5 storeys parking structure. Due to the continuity and irregularity of the three buildings, full 3D dynamic finite element analyses were conducted using a commercial software package. The results of the analysis are post-processed for the assessment of seismic performance. The redesign of the structural members to enhance the seismic performance and prevent the undesirable damage and failure was performed and suggested.

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