Study of Laminated Veneer Lumber (LVL) Sengon to Concrete Joint Using Two-Dimensional Numerical Simulation

The connection system is a critical part of Timber – Concrete Composite (TCC) floor structures. The behaviour of the connection needs to be known to predict the behaviour of composite structure accurately. Screws are one kind of connector that mostly used in the composite structure due to its installation ease and high withdrawal strength. This study carried out a two-dimensional numerical simulation to examine the behaviour of LVL Sengon-concrete joint using OpenSees software. The lag screw used to connect LVL Sengon and concrete. In this simulation, the screw was assumed as a beam with hinges element that supported by a set of springs representing the strength of LVL Sengon and concrete. Some input parameters for this simulation were obtained from the material test and previous research. The effect of secondary axial force was considered into the load-displacement curve resulted from the numerical simulation.  This study performed several simulations towards the variation of the screw diameter, penetration depth, and concrete compressive strength. The capacity of the connections resulted from the numerical simulation were overestimates the manual calculation using EYM theory and NDS 2018 equations. The capacity of the connection increased about 146% to 284% due to the addition of secondary axial forces. In addition, this simulation can adequately predict the shear force, bending moment, and deformation of the screw. There is a plastic hinge formed in the screw after the screw being deformed a quite large.  It shows the same yield mode with the manual calculation using EYM theory and NDS 2018 equations. This simulation also can show the contribution of each spring elements to resist the load until its ultimate strength

Liquefaction potential analysis in Yogyakarta – Bawen Toll Road section 3

The Yogyakarta – Bawen Toll Road construction is one of the National Strategic Projects because it passes through four regencies in Central Java Province and the Special District of Yogyakarta. As the general consideration for infrastructure planning, it was required to consider preventing damages due to natural disasters, including liquefaction caused by an earthquake. The study area has a shallow groundwater table (<10 m), and earthquakes often occurred. Geological conditions showed that the lithologies in Yogyakarta – Bawen Toll Road Section 3 is dominated by silty sand, sandy silt, and gravel. This study aimed to analyze the liquefaction potential in the construction of Yogyakarta – Bawen Toll Road Section 3, especially STA 44+600 – 52+800. The potential liquefaction analysis is calculated using the Simplified Procedure Method based on Standard Penetration Test data. Furthermore, Liquefaction Potential Index (LPI) is applied to determine the level of liquefaction potential. The most central part of the study area indicated no liquefaction potential. On the contrary, the northern and southern parts are indicated to have liquefaction potentials ranging from high to very high. According to the analysis results, it is recommended to have a mitigation plan against liquefaction in the area study

Liquefaction potential evaluation on reconstruction project of irrigation canal in the Jono Oge and Lolu Village

In Indonesia's liquefaction history, the province of Central Sulawesi was severely affected in several locations when a 7.5 Mw earthquake occurred in September 2018. This study aims to evaluate the liquefaction potential and generate the liquefaction hazard map in the reconstruction project of the Gumbasa Irrigation Canals passed through Jono Oge Village and Lolu Village, closely related to the liquefaction event in the Sigi Regency area. Using the simplified procedure method by Idriss and Boulanger, the Liquefaction Factor of Safety (FOS) was calculated for each layer of soil from thirteen (13) locations of soil investigation test at the end of 2021 by the Ministry of Public Works and Housing. Furthermore, it was followed by calculating the Liquefaction Potential Index (LPI) and Liquefaction Severity Index (LSI). The analysis results show that the construction work area has the liquefaction potential with the observed groundwater level. It is mapped on irrigation canals along the Jono Oge Village and Lolu Village to know the critical segment of the irrigation project. Hereafter, an irrigation canal segment named BGKN-45 to BGKN-46 in Jono Oge required a specific mitigation plan to prevent damage from liquefaction in the future

Seismic Performance Comparison of Simply Supported Hollow Slab on Pile Group Structure with Different Operational Category and Shear Panel Damper Application

This study is aimed to compare the seismic performance of simply supported hollow slab on pile group (SHSPG) structures designed as “critical” and “essential” viaducts with shear panel damper (SPD) devices. There were three numerical models to be compared, namely SHSPG-A, SHSPG-B, and SHSPG-C. SHSPG-A is a “critical” viaduct with 35 piles per one pile head. SHSPG-B is an “essential” viaduct with 18 piles per one pile head. SHSPG-C is an “essential” viaduct with 18 piles per one pile head plus sixteen SPDs. Numerical models considered the prestressing effect of the spun pile. Nonlinear time history analyses were executed using seven pairs of recorded ground motions that had been scaled and adjusted to the seismic characteristics of Yogyakarta, Indonesia. As the result, the performance level of SHSPG-A was much better than SHSPG-B. The SPDs application could maintain SHSPG-C’s performance at the same level as SHSPG-A and dissipate 34.28%-53.03% of the seismic energy

履歴型ダンパーを用いた高耐震性能橋脚の開発

京都大学0048新制・課程博士博士(工学)甲第21085号工博第4449号新制||工||1691(附属図書館)京都大学大学院工学研究科都市社会工学専攻(主査)教授 清野 純史, 教授 高橋 良和, 准教授 古川 愛子学位規則第4条第1項該当Doctor of Philosophy (Engineering)Kyoto UniversityDFA

HIGH SEISMIC PERFORMANCE CONCEPT OF INTEGRATED BRIDGE PIER WITH TRIPLE RC COLUMNS ACCOMPANIED BY FRICTION DAMPER PLUS GAP

After the 1995 Kobe earthquake, the structural performance concept of a bridge in Japan considers two levels of seismic excitation which are named as Level 1 and Level 2. However, the Level 2 of ground motion input is a large seismic coefficient demand. Also, the problem of bridge rubber bearing support which commonly is used in Japan lost expected seismic performance due to the deterioration. Some possible causes of the deterioration are the aging, the compression fatigue, or the frequent lateral deformation which triggered by traffic load, wind load, thermal expansion, creeps, and shrinkages phenomena of daily load. While the behavior and the parameters of reinforced concrete (RC) column accompanied with friction device were determined successfully based on the experiment and numerical analysis. This study proposed the structural system of integrated bridge pier with triple RC column connected by friction damper plus gap which is expected to substitute the conventional bridge pier system avoiding the use of rubber bearing. In the investigation of its behavior and seismic performance, numerical analysis was performed with fiber cross-section of non-linear beam-column-based element model on the longitudinal direction of the bridge structure. As the analysis result, the proposed structure had an excellent performance not only under small deformation to allocate frequent lateral deformation but also under seismic load. Furthermore, in the structural simulations, the consideration of different limit state of column location and the various yield strength of reinforcing steel configuration can obtain a better structural cost-performance option

Liquefaction potential evaluation on reconstruction project of irrigation canal in the Jono Oge and Lolu Village

In Indonesia's liquefaction history, the province of Central Sulawesi was severely affected in several locations when a 7.5 Mw earthquake occurred in September 2018. This study aims to evaluate the liquefaction potential and generate the liquefaction hazard map in the reconstruction project of the Gumbasa Irrigation Canals passed through Jono Oge Village and Lolu Village, closely related to the liquefaction event in the Sigi Regency area. Using the simplified procedure method by Idriss and Boulanger, the Liquefaction Factor of Safety (FOS) was calculated for each layer of soil from thirteen (13) locations of soil investigation test at the end of 2021 by the Ministry of Public Works and Housing. Furthermore, it was followed by calculating the Liquefaction Potential Index (LPI) and Liquefaction Severity Index (LSI). The analysis results show that the construction work area has the liquefaction potential with the observed groundwater level. It is mapped on irrigation canals along the Jono Oge Village and Lolu Village to know the critical segment of the irrigation project. Hereafter, an irrigation canal segment named BGKN-45 to BGKN-46 in Jono Oge required a specific mitigation plan to prevent damage from liquefaction in the future

Liquefaction potential analysis in Yogyakarta – Bawen Toll Road section 3

The Yogyakarta – Bawen Toll Road construction is one of the National Strategic Projects because it passes through four regencies in Central Java Province and the Special District of Yogyakarta. As the general consideration for infrastructure planning, it was required to consider preventing damages due to natural disasters, including liquefaction caused by an earthquake. The study area has a shallow groundwater table (<10 m), and earthquakes often occurred. Geological conditions showed that the lithologies in Yogyakarta – Bawen Toll Road Section 3 is dominated by silty sand, sandy silt, and gravel. This study aimed to analyze the liquefaction potential in the construction of Yogyakarta – Bawen Toll Road Section 3, especially STA 44+600 – 52+800. The potential liquefaction analysis is calculated using the Simplified Procedure Method based on Standard Penetration Test data. Furthermore, Liquefaction Potential Index (LPI) is applied to determine the level of liquefaction potential. The most central part of the study area indicated no liquefaction potential. On the contrary, the northern and southern parts are indicated to have liquefaction potentials ranging from high to very high. According to the analysis results, it is recommended to have a mitigation plan against liquefaction in the area study

PENGGUNAAN METODE ELEMEN HINGGA UNTUK TINJAUAN NUMERIK STRUKTUR BOXGIRDER JEMBATAN BETON PRATEGANG PADA TAHAP KONSTRUKSI METODE BALANCE CANTILEVER

The balanced cantilever construction method is suitable for prestressed long span concrete bridge structure segmental. This method is developed to remove need of scaffolding as the implementation of in-situ casting.Segmental construction process can be faster using Rapid Hardening Concrete by jacking the concrete in earlier age. Stress and displacement of the structure must be predicted exactly to prevent occur of crack and significant displacement. Jacking force to the concrete at earlier age were nonlinear analyzed in the anchorage zones to get information concrete stress and the indication of crack. This study reviewed Lemah Ireng II bridge at Semarang � Solo highways (3-spans, 2-piers). This full bridge model was numerically modelled by elastic linear frame element using Midas Civil, and in anchorage zone was a segment modeled by using nonlinear solid 3D elemen using Dassault System Abaqus. This study to get acceptable the stress and displacement of the bridge structure due to the age of concrete jacking variation take in 0.5, 1, 1.5, 2, 3, 4, and 5 days and stress and the indication of concrete crack in anchorage zones due to the age of concrete jacking variation take in 0.5, 1, 1.5, 2, and 3 days. Structure analyze of full bridge model conclude that all displacements at construction stage and long time case variation of concrete curing and jacking force are accepted in the displacement limit, whereas all stress in box girder section are accepted in stress limit except in curing 0.5 day at jacking force is 75% fpu. Structure analyze of anchorage zone conclude that jacking force can be gived minimum at one day age of concrete, although there are some crack at behind of anchorage bloc