Harry Patmadjaja

PENGARUH KEGIATAN PERPARKIRAN DI BADAN JALAN TERHADAP KINERJA RUAS JALAN STUDI KASUS JALAN KERTAJAYA

The using of Roller Compacted Concrete (RCC) is one of many alternatives that can be used to decrease dam construction cost. Many Roller Compacted Concrete (RCC) composition has been developed to achieve maximum compressive strength. Due to the economical consideration and the possibility of the execution, drop hammer system has been used for this research. Compression test is done after the age of the sample reaches seven, 28, 60, and 90 days. The result shows that 60/40 composition of gravel/sand has higher average compressive strength on all age of sample. The highest compressive strength the achieve is 17.78 MPa for 90 days sample.The slake-durability test is regarded as a simple test for assessing weathering of rocks. This simple test has been accepted as a standard test by the Rock Mechanics Society. However, mechanisms into slaking processes have not been fully understood yet as many factors involved in the processes. The current research explored mechanisms performed by the test by conducting a series of slakedurability tests for four types of soft rocks taken from Coober Pedy, South Australia. Results show that the slake-durability index (Id2) of weathered soft rocks was influenced by the degree of weathering. Distinctly weathered rocks had lower indeces compared to partly weathered rocks. Shapes also influenced the Id2 of these soft rocks. Different shapes displayed different mechanisms in the slaking processes. Samples that had irregular shapes tended to have a lower Id2 compared to samples that had rounded shapes. Thus, the slake-durability test might have simple procedures, but it could have complicated mechanisms in slaking processes that contribute to the result of the test.A method commonly used to stabilize expansive soils is mixing the soil with foreign materials. The main obstacle raised from soil stabilization in the field is the difficulty in mixing process. This paper presents the strength distribution in soft soil due to the addition of single columns of quicklime and carbide wasteproduct from gas industry that contains Calcium Oxide (CaO) up to 60%. The results show that the addition of columns filled with carbide waste product and quicklime increase the shear strength of surrounding soil. The spreading of the strength tends to follow a unique pattern, that the increase of soil shear strength at a certain normalized-distance, S (in column diameter D) from the column axis is constant. A significant increase of strength occurs in the area closer to the column, and it decreases with the distance from the column.

PEMODELAN PONDASI DANGKAL DENGAN MENGGUNAKAN TIGA LAPIS GEOTEKSTIL DI ATAS TANAH LIAT LUNAK

Meshless Numerical Analysis Method adalah suatu metode analisa numerik yang berkembang dengan pesat sebagai alternatif metode elemen hingga (Finite Element Method) yang sudah cukup terkenal. Makalah ini merupakan seri pertama dari dua untuk mengenalkan salah satu shape function yang banyak digunakan untuk Meshless Numerical Analysis Method. Makalah seri kedua akan memperkenalkan salah satu Meshless Numerical Analysis Method yang dikenal sebagai Meshless Local Petrov-Galerkin Method.

MODEL STRATEGI PENAWARAN UNTUK PROYEK KONSTRUKSI DI INDONESIA

Limitation of parking spaces in Petra Christian University need to be solved by deterring private cars usage. However, the factors that affect students to choose their mode to campus are unknown. Determination of factors that influence mode choices may support alternatives and policy that could be proposed. Analytic Hierarchy Process was used to analyze the factors. Trips characteristics data of the students was collected by questionnaires interview. The results of the analysis show that the main factors that influence student to choose their mode to campus is security (49,3%) and time (27,3%). Walking from student dormitory was the best alternative (33.2%), while carpool (16%) is slightly lower than private cars usage (18%). Vanpool (12.4%) is lower than carpool.

MENCARI PENYEBAB KECELAKAAN DI JALAN TOL SURABAYA-GEMPOL DENGAN ANALISA FREKUENSI DAN CROSSTABULATION

Three hunderd and thirteen data of accident between January 1997 and December 1997 were used to determine causes of accident in Surabaya-Gempol Surabaya-Gempol Tol Road. The evaluations were done using Frequency, and Crosstabulation analysis. Frequency analysis was used to determine the blackspots, whereas Crosstabulation analysis using Pearson chi-square and the contingency coefficient was used to identify corelations between fatality of accident, major cause of accident, variables causing major accident and other variables causing accident. The analysis concluded that fatal accidents were caused by sleepiness. The variables causing the accident were; the driver’s physical condition, close spacing of the vehicles and tyre failures. Fatal, and nonfatal accidents were caused by variables as type of vehicle, vehicle manuever and the age of driver as well as the vehicle.

PENELITIAN PENDAHULUAN PENGGUNAAN BENDA UJI KUBUS BETON PADA PERKERASAN LENTUR TYPE CEMENT TREATED BASE CTB

The outrigger and belt truss system is commonly used as one of the structural system to effectively control the excessive drift due to lateral load, so that, during small or medium lateral load due to either wind or earthquake load, the risk of structural and non-structural damage can be minimized. For high-rise buildings, particularly in seismic active zone or wind load dominant, this system can be chosen as an appropriate structure. This paper studies the use of outrigger and belt truss system for high-rise concrete building subjected to wind or earthquake load. Eight 40−storey two dimensional models of outrigger and belt truss system are subjected to wind load; and five 60−storey three dimensional models are subjected to earthquake load, analyzed and compared to find the lateral displacement reduction related to the outrigger and belt system location. For the two dimensional 40−storey model, 65% maximum displacement reduction can be achieved by providing first outrigger at the top and second outrigger at the middle of the structure height. For the three dimensional 60−storey structural model subjected to the earthquake load, about 18 % reduction in maximum displacement can be achieved with optimum location of the outrigger truss placed at the top and the 33rd level.The importance of understanding the performance of a building in a holistic sense is undeniable. This paper presents a method of total building performance evaluation, which has been widely used in many developed countries including Singapore. An office building with apartment and commercial retails called “intelligent building” is selected for building diagnosis. The occupant surveys and physical walkthroughs are carried out as subjective evaluations, while some objective measurements of indoor air quality and visual quality are also introduced in this study. The results indicate that generally, the occupants are satisfied with the quality of the building despite some insignificant indoor air quality and visual symptoms due to low temperature and glare problem in the office.

APLIKASI MATERIAL REQUIREMENT PLANNING UNTUK MENGENDALIKAN INVESTASI PENGADAAN MATERIAL PADA PT. JHS PILLING SYSTEM

The outrigger and belt truss system is commonly used as one of the structural system to effectively control the excessive drift due to lateral load, so that, during small or medium lateral load due to either wind or earthquake load, the risk of structural and non-structural damage can be minimized. For high-rise buildings, particularly in seismic active zone or wind load dominant, this system can be chosen as an appropriate structure. This paper studies the use of outrigger and belt truss system for high-rise concrete building subjected to wind or earthquake load. Eight 40−storey two dimensional models of outrigger and belt truss system are subjected to wind load; and five 60−storey three dimensional models are subjected to earthquake load, analyzed and compared to find the lateral displacement reduction related to the outrigger and belt system location. For the two dimensional 40−storey model, 65% maximum displacement reduction can be achieved by providing first outrigger at the top and second outrigger at the middle of the structure height. For the three dimensional 60−storey structural model subjected to the earthquake load, about 18 % reduction in maximum displacement can be achieved with optimum location of the outrigger truss placed at the top and the 33rd level.The importance of understanding the performance of a building in a holistic sense is undeniable. This paper presents a method of total building performance evaluation, which has been widely used in many developed countries including Singapore. An office building with apartment and commercial retails called “intelligent building” is selected for building diagnosis. The occupant surveys and physical walkthroughs are carried out as subjective evaluations, while some objective measurements of indoor air quality and visual quality are also introduced in this study. The results indicate that generally, the occupants are satisfied with the quality of the building despite some insignificant indoor air quality and visual symptoms due to low temperature and glare problem in the office.

PEMODELAN BANGKITAN PERGERAKAN PADA TATA GUNA LAHAN SEKOLAH DASAR SWASTA DI SURABAYA

In recent years, meshless methods have been developed as alternative numerical approaches in efforts to eliminate known drawbacks of the Finite Element Method (FEM). The main objective in developing meshless methods was to eliminate, or at least reduce, the difficulty of meshing and remeshing of complex structural elements. The nature of various approximation functions employed by meshless methods allows the definition of problem domains by simply adding or deleting nodes where desired. Nodal connectivity to form an element as in FEM method is not needed, only nodal coordinates and their domain of influence (DOI) are necessary to descretize the problem domain. Meshless methods may also reduce other problems associated with the FEM, such as solution degradation due to locking and severe element distortion [1].