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Parhimpunan Purba
Jurusan Teknik Sipil PSD III, UNDIP
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TEKNIK – Vol. 29 No. 2 Tahun 2008, ISSN 0852-1697 139 *) Staf Pengajar Jurusan D III Teknik Sipil Fakultas Teknik Undip TEGANGAN SEKUNDER PADA STRUKTUR RANGKA BATANG Purba, Parhimpunan
TEKNIK Volume 29, Nomor 2, Tahun 2008
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (153.268 KB) | DOI: 10.14710/teknik.v29i2.1935

Abstract

In our previous analysis of trusses, it was always assumed that the truss members are joined by idealhinges and that loads are applied only at joints. The centroidal axes all of members are stright,coincide with the lines connecting the joint center, and lie in a plane that also contains the lines ofaction of all the loads and reaction. Thus the members of truss are subjected to axial force only, andthese can be determined by static method. A stress analysis base on these assumtion leads to thedetermination of so – called “primary stresses”.In actual cases the joint are usually riveted or welded; and because of this fact the members undergo,not only axial forces, but also bending stresses from secondary moment, cuased by this condition arecalled “secondary stresses”. In discusing secondary stresses we shall consider only trussses in oneplane and assume that this plane represents the plane of symmetri for all members and that externalloads are acting in the same plane. Of these the most important are caused by the fact that the jointare rigid, and hence the members are not free to change their relative directions when the truss isdeformed. This problem can likewise be solved very eficiently by means of moment distibution.From the first analyze result, it was obtained the scondary tension ratio with the primary tension at thepull shaft about 19.20 %. This result is significant that it will increase the existence of primary tension.At the analyze by SAP 2000 is obtained that the end tension much more lower than the scondarytension in the first analyze. This is need to obtain attention at planning trusses.
RANCANG BANGUN KOTAK PENYIMPAN IKAN BERINSULASI UNTUK MEMPERTAHANKAN KUALITAS IKAN DENGAN PROSES PENDINGINAN SERTA APLIKASINYA PADA IKAN TONGKOL (AUXIS THAZARD) Tuti Susanti, Margaretha; Purba, Parhimpunan
TEKNIK Volume 29, Nomor 2, Tahun 2008
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (169.256 KB) | DOI: 10.14710/teknik.v29i2.1933

Abstract

Fish Cooler Box Have Designed With Measurement 50 X 70 X 40 Cm, with layers box wall and the partfrom out box : fiber glass, strerofoam wood and fiber glass. The boxes will be aplicate for tongkol fish(Auxis thazard) preservation. Variation that done in this research is comparation between ice and fish.topreservation times. Parameter that measured are fish quality like : fat degradation with TMA method,protein degradation with TVB method, rotten with TMAO method, and organoleptic test like : smell,appearence, texture. Result of this research with that parameter tests are : comparation between ice andfish 2:1, but with comparation 1:1 fish quality is still good for consumption
TEGANGAN SEKUNDER PADA STRUKTUR RANGKA BATANG Purba, Parhimpunan
TEKNIK Volume 28, Nomor 2, Tahun 2007
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (162.14 KB) | DOI: 10.14710/teknik.v28i2.2134

Abstract

In our previous analysis of trusses, it was always assumed that the truss members are joined by ideal hingesand that loads are applied only at joints. The centroidal axes all of members are stright, coincide with thelines connecting the joint center, and lie in a plane that also contains the lines of action of all the loads andreaction. Thus the members of truss are subjected to axial force only, and these can be determined by staticmethod. A stress analysis base on these assumtion leads to the determination of so – called “primarystresses”.In actual cases the joint are usually riveted or welded; and because of this fact the members undergo, notonly axial forces, but also bending stresses from secondary moment, cuased by this condition are called“secondary stresses”. In discusing secondary stresses we shall consider only trussses in one plane andassume that this plane represents the plane of symmetri for all members and that external loads are acting inthe same plane. Of these the most important are caused by the fact that the joint are rigid, and hence themembers are not free to change their relative directions when the truss is deformed. This problem canlikewise be solved very eficiently by means of moment distibution.From the first analyze result, it was obtained the scondary tension ratio with the primary tension at the pullshaft about 19.20 %. This result is significant that it will increase the existence of primary tension. At theanalyze by SAP 2000 is obtained that the end tension much more lower than the scondary tension in the firstanalyze. This is need to obtain attention at planning trusses.
PENGARUH KANDUNGAN SULFAT TERHADAP KUAT TEKAN BETON Purba, Parhimpunan
METANA Vol 4, No 1 (2007): Juni 2007
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4207.809 KB) | DOI: 10.14710/metana.v4i1.1723

Abstract

Abstract   Compressive strength is one of the important mechanical characteristic that it can indicates the concrete performance. One of the important material in concrete making is water. Water have .function as mixing material and treatment material. Water may not contain substrat that harm of concrete. This research is intended  to know the influence of sulphate in the water both of as mixing material or treatment material. From this research indicates that the sulphate ion in the water most influence to concrete pressure strength.   Key word : Compressive strength, concrete, sulphate, water cement ratio, treatment
Co-Authors Margaretha Tuti Susanti