Claim Missing Document
Check
Articles

Found 6 Documents
Search

ANALISIS DAN SIMULASI NUMERIS DEFORMASI RAFT FOOTING DI ATAS TANAH LUNAK DENGAN MENGGUNAKAN PEMODELAN TANAH MOHR COULOMB (Studi kasus: Bangunan Fakultas Hukum Universitas Sultan Agung Semarang) Irdhiani, Irdhiani
MEKTEK Vol 10, No 1 (2008)
Publisher : MEKTEK

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (392.274 KB)

Abstract

The main problem in designing construction structure on soft soil is a considerable large deformation, therefore in this research light material is used that is styrofoam concrete to replace landfill in raft footing so the deformation can be reduced. The percentage styrofoam used in concrete miixture are 40%, 60%, 80% dan 100%, then the deformation form caused by construction weight is analysed using Plaxis sofware version 7.0 with soil model Mohr-Coulomb at three soil water surface condition, they are in very deep water surface, in foundation base and on soil surface. The research result shows that the large the total construction weight, the larger vertical and horisontal movements happened. For styrofoam concrete with the percentage of styrofoam 100% the vertical movement is the opposite direction with other material-fills, because the total weight of construction is lesser than excavated soil weight at 2,45 meter deep.
Pemanfaatan Beton Styrofoam Ringan Sebagai Pengganti Tanah Urug Pada Raft Footing Untuk Meningkatkan Jumlah Beban Di Atas Tanah Lunak Irdhiani, Irdhiani
SMARTek Vol 6, No 1 (2008)
Publisher : SMARTek

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (230.872 KB)

Abstract

Tanah lunak memiliki sifat compresibel sehingga memungkinkan terjadinya penurunan yang besar akibat beban yang bekerja. Salah satu alternatif untuk mereduksi penurunan yang terjadi yaitu mereduksi berat bangunan berarti menggunakan material yang lebih ringan baik pada struktur bagian atas maupun pada timbunan. Dalam masalah ini, material ringan yang digunakan adalah styrofoam yang digunakan sebagai campuran beton untuk bahan pengisi timbunan. Penelitian ini menggunakan beton Styrofoam dengan persentase styrofoam 40%, 60%, 80% dan 100%. Beban yang bekerja terdiri dari berat bangunan dan berat timbunan. Berat bangunan ditentukan dengan menggunakan Structural Analysis Program (SAP), kemudian Faktor aman dan jumlah beban atau lantai bangunan yang dapat ditambahkan pada tiga kondisi muka air tanah yaitu muka air terletak sangat dalam, di dasar fondasi dan di permukaan tanah dapat ditentukan melalui suatu analisis hitungan. Hasil penelitian menunjukkan bahwa faktor aman terbesar terjadi pada beton styrofoam dengan persentase styrofoam 100% yaitu diperoleh sangat aman untuk kapasitas dukung tanah dengan letak muka air di permukaan tanah dan jumlah beban atau lantai bangunan terbesar yang dapat ditambahkan terjadi pada beton styrofoam dengan persentase styrofoam 100% yaitu sebanyak 3,36 lantai untuk kapasitas dukung tanah dengan letak muka air sangat dalam
DESAIN FONDASI TELAPAK DENGAN MENGGUNAKAN BETON STYROFOAM RINGAN PADA TANAH LEMPUNG BERPASIR Irdhiani, Irdhiani; Ramadhani, Sriyati
JOURNAL TEKNIK SIPIL DAN INFRASTRUKTUR Vol 4, No 2 (2014)
Publisher : Jurusan Teknik Sipil Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (206.466 KB)

Abstract

Recently, the price of construction material has gone up especially price of cement as the primary material for foundation construction. In the area which is consist of soft soil with higher water level, a higher foundation section area such as plate foundation or pile foundation is needed. It will be costly when pile foundation or plate foundation utilized in lightweight building. Therefore, lightweight concrete foundation might be useful as an alternative to reduce cement volume in concrete material which will reduce the cost of foundation construction. The research aims to determine the optimum percentage of lightweight Styrofoam concrete in plate foundation against bearing capacity, settlement, and uplift force in sandy clay.  Foundation were made of concrete mixed with Styrofoam with contents varied as 0%, 20%, 40%, 60% 80%  and 100%, then its pressure strength and volume weight at 28 days cure were tested. From physical properties tests such as sieve analysis and Atterberg limit test, the soil classified as CL or anorganic clay with low to medium plasticity, sandy clay with A(activity) of 0.87 which means it has illite clay mineral content in the soil with activity (A) medium.  Direct shear test shows that the soil have a friction angle (f) 24,25° and cohesion (c) 0,0197 kg/cm.  Concrete unit weight containing no Styrofoam is 2,222 gr/cm3. Average concrete unit weight will be reduced as 0,2726 gr/cm or 12% for each addition of 20% of Styrofoam. The percentage of concrete pressure strength reduction by addition of Styrofoam of 10%, 20%, 30%, and 40% compare to concrete pressure strength with no Styrofoam added are 24,470%, 44,453 %, 58,601 %, and 69,145 % respectively Reduction of  concrete pressure strength are due to Styrofoam particles that may act as air void, in which concrete with air void has lower pressure strength compare to concrete without air void. Kata Kunci : Plate Foundations, Lightweight Styrofoam Concrete, Sandy Clay
STUDI KARAKTERISTIK PASIR SIURI DENGAN PENAMBAHAN BUTIRAN HALUS NONPLASTIS (STUDI KASUS FC Chandra, Herfiya; Oktaviana, Ida Sri; Irdhiani, Irdhiani
JOURNAL TEKNIK SIPIL DAN INFRASTRUKTUR Vol 3, No 2 (2013)
Publisher : Jurusan Teknik Sipil Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (829.889 KB)

Abstract

Physical and mechanical properties of uniform sand (Siuri sand) mixed with fine grains is not the same as pure uniform sand, and the void ratio (e) can not be considered as appropriate index to describe the microstructure changes due to the fine grains. Thus, the use of intergranular void ratio is recommended for the condition of fine content less than the threshold fine content (FC <FCth). In this article, the primary data were obtained by conducting laboratory tests, by testing the physical and mechanical properties of the mixtures. Tests were carried out on pure Siuri sand (0%), pure non-plastic fines (100%), and the mixtures with fine content variations of 10% - 90% (by weight of mixture), however, the discussion were focused on dominant coarse grain conditions which was pure Siuri sand (0%) and the mixtures with non-plastic fine composition varied as 10%, 20%, 30% and 40%. The results show that the changes in content of non-plastic fines combined with Siuri sand showed characteristic changes in a similar pattern both in physical and mechanical properties. Fines addition to Siuri sand had increased the value of some parameter (gd, gdmax, gdmin, f, dan t) and had decrease some other parameter (e, emax, dan emin) up to the 30% fine content, then the opposite occured in 40% fine content. When fine content had exceed threshold fine content (FCth) which were between 30-40%, it showed a behavior transition, from behavior of higher contribution of sand in the mixture (dominance of sands) to higher contribution of fines (dominance of fines).   Keywords: void ratio, intergranular void ratio, shear strength, Siuri Sand
PERBAIKAN SIFAT GEOTEKNIS TANAH DASAR UNTUK JALAN DENGAN ABU BATUBARA Irdhiani, Irdhiani
JOURNAL TEKNIK SIPIL DAN INFRASTRUKTUR Vol 2, No 2 (2012)
Publisher : Jurusan Teknik Sipil Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (346.093 KB)

Abstract

Abu batubara merupakan limbah padat yang tidak mudah larut dan tidak mudah menguap. Apabila jumlahnya banyak dan tidak ditangani dengan baik, maka abu batubara tersebut dapat mengotori lingkungan. Abu batubara berbentuk partikel halus amorf dan bersifat pozzolan yang dapat dimanfaatkan sebagai bahan stabilisasi pada tanah lempung yang memiliki plastisitas dan kembang susut yang tinggi serta daya dukung yang rendah bila kadar airnya tinggi. Abu batubara digunakan sebagai bahan aditif pada tanah lempung dengan persentase 0%, 10%, 20%, 25%, 30% dan 40% terhadap berat kering tanah lempung. Pengujian pada penelitian ini meliputi pengujian sifat-sifat fisik dan sifat-sifat mekanis. Pengujian campuran tanah lempung dengan abu batubara meliputi batas-batas Atterberg, pemadatan, CBR tanpa rendaman dan CBR rendaman. Hasil pengujian menunjukkan bahwa penambahan abu batubara pada tanah lempung dapat meningkatkan daya dukungnya dan menurunkan nilai indeks plastisitas tanah dari 24,81 menjadi 7,93 pada 40% abu batubara. Persentase abu batubara yang paling maksimal dalam penelitian ini adalah 25%. Pada pengujian pemadatan, nilai berat isi kering maksimum meningkat dari 1,700 gr/cm3 menjadi 1,963 gr/cm3 dan kadar air optimum menurun dari 15,032% menjadi 9,753. Pada pengujian CBR, nilai CBR tanpa rendaman dari 6,91% menjadi 20,56% dan nilai CBR rendaman dari 3,46% menjadi 12,12%. Kadar abu batubara diatas 25% cenderung mengalami penurunan tetapi penurunan yang terjadi tidak begitu besar dan masih memenuhi syarat sebagai lapisan tanah dasar untuk perkerasan jalan
Alternatif Fondasi Tiang Pancang Pada Gedung Pengendalian Penduduk dan Keluarga Berencana (P2KB) Palu Hidayat, R.; Irdhiani, Irdhiani
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 2 Issue 1 (March 2021)
Publisher : Civil Engineering Department, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v2i1.239

Abstract

The foundation design of Pengendalian Penduduk dan Keluarga Berencana is located on Jl. R.A. Kartini No. 100, Palu City, Central Sulawesi. In field testing using 2-point of (CPT), the value of hard-ground support at 8 – 9 m below the surface and the loads of building structures of 2 (two) floor buildings that work on the foundations are quite large, this is a consideration in choosing the type of used foundation. The point of this design is to obtain the dimensions of the pile foundation and calculate the bearing capacity of the foundation permit and settlement that meet the safety requirements. The calculation for bearing capacity of the foundation is calculated using (CPT) data and soil shear strength parameter data (c and tetha). Single pile is calculation by using the Semi-Empirical method and using Brooms Method for calculating lateral force on the driven piles. The dimensions of the foundation are planned based on the load (Qv) acting on the entire foundation. Calculation of bearing capacity of a single pile with a penetration depth of 8,20 m and varying dimensions are used in the planning. Based on the calculation of the bearing capacity of a single pile using (CPT) data on the load that works on the foundation, was obtained 25 cm and 30 cm diameter of pile. while the calculation uses ground shear strength parameter data (c and tetha) obtained pile diameter of 30 cm and diameter of 35 cm. Based on the calculation of the bearing capacity of a single pile, the dimensions of the foundation and the settlement in permits has reached the safety requirements.