Break even analysis & response of longer span frames with or without post-tensioned beams in multipurpose hall

In this paper analyzed the RC a nd PT Beam against variation in the clear span length of the beam. This work includes the design and estimate of Cost/Beam from 5m span up to 15m span length of the beam. Also, The response of the frame following two variation in its modelling. Initially, The primary model consists of a conventional RCC frame with all beams and columns as RCC. The secondarily model considers peripheral beams as RCC and interior beams with PT. Such as ETABS software used to designed RC beam element and ADAPT-PTRC used to designed PT beam element. However it has been note that variation of cost with respect to the span of beam where the break-even point between RCC and PT technique is approx 7m Span. Also the control on deflection of beam by restrict the depth of beam by using unbonded Post-tensioned prestress concrete beam method. There is very good understand all aspects PT beam better than as compared with to RC beam in deflection against longer span length of beams. This paper gives suggestion about to reach a decidedly conclusion regarding which technique is superior over one another.

ANALISIS PENGARUH RANGKAK SUSUT BETON TERHADAP TEGANGAN DAN LENDUTAN BERDASARKAN BEBERAPA PERATURAN PADA JEMBATAN PRATEGANG

Prestress losses are one of the important factors that used in prestress concrete construction design. Prestress losses generally divided into immediately losses and time dependent losses. On the process of bridge construction, the prestress losses caused by time dependent have a big influence on the deflection and stressess results that because the life services of bridges normally more than 10 years. If there are any error occurs in calculating the effect of time dependent losses, then the deflection that occurs when life service could exceed the maximum allowed deflection. Therefore, the purpose on making this thesis is to analyst how much the influences of time dependent effect (creep and shrinkage) using 3 different methods, that is ACI209.2R-08, CEB-FIP MC90 and EN-1992-1-1. This bridge has total span length of 60m with rolled-joint placement and single span type. Using double cellular prestress concrete as girder. Stages of loading apply a superimposed deadload, creep and shrinkage using a interval duration of 7,30 and 10000 days. This analysit was carried out by using MIDAS 2020 software. The result of this analyist showed the deflection that occurs with the 3 different methods is quite similiar. And the deflection after construction still below the maximum allowable deflection.Kehilangan prategang atau yang biasa disebut prestress losses adalah komponen penting dalam konstruksi menggunakan beton prategang. Prestress losses dibagi menjadi dua yaitu immediately losses dan time dependent losses. Dalam proses konstruksi jembatan, prestress losses yang diakibatkan oleh time dependent sangatlah berpengaruh terhadap lendutan dan tegangan yang dihasilkan karena umur layan jembatan biasanya berkisar hingga 10 tahun keatas, jika salah dalam memperhitungkan efek dari time dependent losses maka lendutan yang terjadi dapat melampaui batas ijin lendutan sehingga dapat menyebabkan jembatan collapse. Oleh karena itu, tujuan dari skripsi ini adalah untuk mengetahui seberapa besar pengaruh time dependent losses mengcakup creep dan shrinkage dengan menggunakan 3 metode yang berbeda yaitu ACI209.2R-08, CEB-FIP MC90 dan EN-1992-1-1. Jembatan yang didesain memiliki panjang 60m dengan perletakan sendi-rol dan jenis jembatan single span. Menggunakan double cellular prestress concrete sebagai girder. Interval analisis adalah 7 hari , 30 hari dan 10000 hari. Analisis digunakan menggunakan program Midas Civil 2020. Hasil dari analisis ini menunjukkan bahwa lendutan yang dihasilkan dari ketiga metode relatif identik dan lendutan yang terjadi hingga 10000 hari masih dalam batas ijin.