This paper investigates the compressive strength of concrete in a 3-dimensional contact problem using the Discrete Element Method (DEM). This method was chosen because it can simulate the development of a single fracture up to massive fragmentation, including cracks pattern and coalition. The experimental test consisted of four cubes with 150x150x150 mm in dimensions, the constant of axial load applied to each specimen of 0.05Po up to 0.70Po. The data analysis has been carried out in Discrete Element and opensource three-dimensional code (YADE). The spherical Particles were used to the material models of concrete cubes. The pulse velocity parameter proposed to determine the behavior of the material during loading. The DEM and pulse velocity results illustrate the conformity of the relationship between stress and strain, deformation characteristics, and compressive strength of concrete.
This study describes the pattern of concrete damage to compressive and tensile strength on various of concrete quality using DEM (Discrete Element Method). Concrete was design as a uniform material in the three-dimensional analysis. Sphere particle is used to simplified the complex analysis. Laboratory testing is carried out to validate the performance of the DEM in the macroscopic model. Each variant has two specimens, the specimens consist of three different compressions, and the Brazilian splitting tensile test was 20MPa, 25MPa, and 30MPa. The test results show that the DEM analysis can model crack behavior under loads. The model was capable of predicting the performance of plain concrete with different qualities. The stress-strain curve, damage particle, velocity, and mechanical parameter of concrete quality were obtained. Finally, the uniform of spherical particle material is an alternative that can be proposed in the concrete laboratory-scale test modelling.
ABSTRAKPaper ini membahas tentang state of the art penyelesaian sengketa konstruksi di Indonesia yang meliputi jenis sengketa, indikasi potensi sengketa, dan perbandingan peraturan penyelesaian sengketa jasa konstruksi. Metode yang digunakan adalah mix method yang terdiri dari expert judgment, studi literatur dengan memperbandingkan riwayat penyelesaian perselisihan kontrak konstruksi mengacu kepada UU No.02/2017, Perpres No.16, UU No. 30 / 1999, dan PP No. 22/2020, dan Dispute Resolution Management Matrix (DRM-Matrix). Hasil analisis menunjukkan bahwa dua hal pokok penyelesaian sengketa yaitu pilihan penyelesaian sengketa dan penyelesaian sengketa di luar pengadilan (litigasi dan non litigasi). Penyempurnaan diberlakukan dalam PP No.22 Tahun 2020 yang menjelaskan tentang tahapan penyelesaian sengketa yang menyangkut mediasi, konsiliasi, dan arbitrase, juga terkait dengan penunjukkan dewan sengketa.Kata kunci: kontrak, konstruksi, perselisihan, state of the art ABSTRACTThis paper discusses of state of the art construction dispute resolution in Indonesia, which includes types of disputes, indications of potential disputes, and comparison of construction service dispute resolution regulations. The proposed method is a mixed-method consisting of expert judgment, literature study by comparing the history of construction contract dispute settlement referring to Law No. 02/2017, Presidential Decree No. 16, Law No. 30/1999, and PP. 22/2020, and the Dispute Resolution Management Matrix (DRM-Matrix). The results show that there are two main issues for dispute resolution, namely the choice of dispute resolution and dispute resolution outside the court (litigation and non-litigation). Improvements are enforced in Government Regulation No.22 of 2020 which explains the stages of dispute resolution involving mediation, conciliation and arbitration, as well as the appointment of a dispute board.Keywords: contract, constructions, dispute, state of the art
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