กำลังเรียกดู โดย ผู้เขียน "Phaiboon Panyakapo"
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รายการ Development of Lightweight Concrete Interlocking Block Panel with Water Treatment Sludge and Expanded Metal Ferrocement(Engineering Journal, 2564-01-31) Rattawit Amornpunyapat; Phaiboon Panyakapo; Mallika PanyakapoAn innovative lightweight concrete interlocking block panel was developed to improve the lateral resistance of the infilled frame with green construction material. The water treatment sludge obtained from Bang Khen water treatment plants was employed to replace the fine aggregate. The lightweight concrete interlocking block panel was strengthened with ferrocement technique and expanded metal sheet. Three sets of the strengthened block panels with various sizes of expanded mental were investigated: concrete block panel, interlocking block panel with thin bed adhesive mortar, interlocking block panel with thick bed cement mortar. The concrete with mixed proportion of cement, sand, water, foaming agent, and sludge of 1:0.70:0.60:0.006:0.30 by weight was suitable for producing the lightweight concrete block according to the Thai Industrial Standard. The compressive strength test of masonry prisms and the diagonal tension (shear) test were conducted for the three sets of the strengthened block panels. The test results reveal that the interlocking block was superior to the conventional concrete block in terms of strength and ductility capacity due to the effect of interlocking between the block. The shear key with thick bed cement mortar is more effective than the thin bed adhesive mortar typically used in the construction of lightweight concrete.รายการ FRICTION LOSS AND ELONGATION OF PRESTRESSING STEEL IN POST-TENSIONED FLAT SLAB(มหาวิทยาลัยศรีปทุม ชลบุรี, 2566-06-13) Phaiboon PanyakapoThis study was to evaluate the friction loss and elongation of prestressing tendon in post-tensioned flat slab. The typical layout of the carpark building was selected in this study. A comparison between the calculated elongation and the measured value was conducted for the tendon. The designed elongation was calculated from the tendon profiles indicated in the construction drawing. The site deviation which was the deviation of the tendon profiles measured in the installation process were collected to calculate of the deviation of friction loss and elongation. The calculated elongations were compared with the collected data measured from the ram after stressing. It was revealed that the calculated elongation and the measured elongation was deviated up to 11.10%, which was greater than the allowable limit of 7.00%. This deviation was due to the discrepancy between the design tendon profile and the actual construction, which contributed up to 40% of the total deviation. The effect of site deviation played an important role on the elongation which should be taken into account in the design.รายการ A New Earthquake Resistant Design Standard for Buildings in Thailand(2561-11-22) Nakhorn Poovarodom; Pennung Warnitchai; Teraphan Ornthammarath; Sutat Leelataviwat; Phaiboon Panyakapo; Amorn Pimanmas; Chatpan Chintanapakdee; Panitan LukkunaprasitThe first seismic regulation in Thailand was issued in 1997 and followed by the design standard which has been published since 2009. Recent understandings of regional seismic hazard and new findings from researches have identified some key amendments for the standard. This paper presents major revisions of the 2018 standard as following contents; updated probabilistic seismic hazard assessments, new design spectral acceleration for Bangkok and vicinity area considering deep basin effects, seismic detailing requirements for concrete moment frames, recommendations for RC frames with masonry infill walls, seismic load for foundation design, revision of seismic detailing requirements, modification of response spectrum analysis procedure and miscellaneous amendments.รายการ Seismic Analysis of RC Frames with Brick Infill Panel Strengthened by Steel Cage and Expanded Metal(Engineering Journal, 2564-04-30) Phaiboon PanyakapoThe seismic analysis of reinforced concrete infilled frame strengthened by using steel cage and expanded metal was investigated. The strengthening technique of steel cage consisted of steel angle, batten and expanded metal sheet was employed. The brick infill panel was strengthened with ferrocement and expanded metal. The flexible base foundation was considered by modelling the pile foundation with the lateral and the vertical spring stiffness. Eight types of frames: four existing frames and four retrofit frames were analyzed by nonlinear static analysis and nonlinear time history analysis with 20 ground motion records. It was found that the initial stiffness and the strength of the retrofit frames were significantly higher than those of the existing frames. The observed seismic damage of the retrofit frames was decreased to the specified limit. The initial stiffness of the frames with flexible foundation was lower than that of the fixed base resulting to the larger displacement and the higher seismic damage of the structures.รายการ Seismic Analysis of RC Frames with Brick Infill Panel Strengthened by Steel Cage and Expanded Metal(Engineering Journal, 2564-04-30) Phaiboon PanyakapoThe seismic analysis of reinforced concrete infilled frame strengthened by using steel cage and expanded metal was investigated. The strengthening technique of steel cage consisted of steel angle, batten and expanded metal sheet was employed. The brick infill panel was strengthened with ferrocement and expanded metal. The flexible base foundation was considered by modelling the pile foundation with the lateral and the vertical spring stiffness. Eight types of frames: four existing frames and four retrofit frames were analyzed by nonlinear static analysis and nonlinear time history analysis with 20 ground motion records. It was found that the initial stiffness and the strength of the retrofit frames were significantly higher than those of the existing frames. The observed seismic damage of the retrofit frames was decreased to the specified limit. The initial stiffness of the frames with flexible foundation was lower than that of the fixed base resulting to the larger displacement and the higher seismic damage of the structures.รายการ Seismic Shear Strengthening of Reinforced Concrete Short Columns Using Ferrocement with Expanded Metal(Engineering Journal, 2562-11-30) Songkran Panyamul; Phaiboon Panyakapo; Anat RuangrassameeTypical reinforced concrete short column is brittle in shear rather than flexure under lateral cyclic loading due to its shear deficiency. This paper presents the improvement of seismic behaviour of the reinforced concrete short columns which were strengthened by using ferrocement with expanded metal. Full scale experiments were conducted for two strengthened concrete columns with different volume fractions of expanded metal and the control specimen under lateral cyclic loading. It was found that the seismic behaviour in terms of the shear strength, stiffness, displacement ductility, and energy dissipation were significantly improved. The expanded metal mesh with the high specific surface provided the better performance for controlling the crack propagation. The brittle shear failure mode of the stirrup was reduced and the ductile flexure mode of the longitudinal reinforcement was dominant. The reduced shear force of the stirrup was compensated by the shear force of the expanded metal reinforcement which experienced relatively large strain. The technique of steel angle installation at the corners of column can successfully prevent the effect of sharpened corner wrapping of the mesh. A model to predict the shear strength of the strengthened column is presented in term of the global efficiency factor for expanded mental.รายการ Seismic Strengthening of RC Frame and Brick Infill Panel using Ferrocement and Expanded Metal(Engineering Journal, 2563-05-31) Suvawat Longthong; Phaiboon Panyakapo; Anat RuangrassameeThis paper presents the strengthening of reinforced concrete frame and brick infill panel by using ferrocement technique reinforced with expanded metal. Analytical models of the strengthened frame and infill panel were proposed. An experimental study on the strengthened frames was conducted to verify the proposed models. Two control specimens and two strengthened specimens were compared: the bare frame and the infilled frame. Special strengthening techniques were employed to protect against two major failures: the beam and columns of the frame were fully strengthened to prevent shear failure, and the infill panel was protected against corner compression failure. The frames were investigated under constant vertical load and lateral cyclic load. The seismic behavior of the retrofit frames was compared with the control specimens. The strengthened frames showed the significant increase of strength up to 64% and 87%, and the ductility capacity was also improved 77% and 66% for the bare frame and the infilled frame, respectively. The proposed model of strengthening for the frame and infill panel predicted the lateral resistance of the RC infilled frame with a reasonable accuracy when compared to the observed experimental results.