Mohammad Bisri

MODELING OF DISCHARGE FLUCTUATION INFLUENCE ON RIVER MEANDERING GEOMETRY CHANGE

The river meander geometry change is a process in the rivers pertaining to erosion on one cliff and river bottom in one side accompanied by sedimentation in the other side, it is becomes a threat to safety of river buildings. This research aims to build a useful empirical model for analyze discharge fluctuation change influence on river meander geometry changes. This model was constructed by considering sedimentation function E = f(Q, A, hb, O, S, rc, aand tand scouring functionG = f (Q, A, hb, O, D50, rc,  aand t ). By applying this model shifting vertical meander most progressive is in a cross section in 1992 to 2011 occurring shifting deep as 7.27 metres. The most progressive horizontal meander shifting occur in other cross section, in the same period horizontally shift towards right bank of 3.15 metres. The second progressive horizontally shifting meander occurs in a cross section, occurring shifting horizontally toward the right bank of 2.67 metres. Erosion process more dominant is caused by changes in discharge fluctuations.

On the Simplification of Flexural Failure Prediction of Glass Reinforced Concrete: An Eco-friendly Beam Structure-under 4 Point Bending Loads

This study is aimed to explore how to simply predict the failure of glass reinforced concrete. A lack of design by analysis using FEM has a plenty extensive technique, particularly for reinforced concrete structure cases. Their ingredient are complicated hence induce time costly analysis caused by DOF booming due to an severe computation concerned size of grains, reinforcement, pull out bonds, meso-scale properties and initial cracks, cover spalling and delaminations. Some real concrete based softwares were costly and hard to be run because their complexity input needed. An eco-friendly beam structure using glass strips waste as reinforcement called GLARC (Glass Reinforced Concrete) has been proposed and need to be simply analysis, something convenient but quiet proper for design aims, hence the failure behavior should be easy to predict and its criterion should be known well. Contrast to the deformations and strains that have a strong affiliation with material model, the stresses are fairly free from material model because actually they are loads. Hence standard linear FEM software adequate enough to use as initial analysis GLARC system or its design aims. In this study, a GLARC beam was used as typical example and 4 points bending loads was applied. Initially, the failure will be occurs first at the tensioned part of the concrete and then the next failure sequences were concrete cracks, then glass strip breaks or slip to concrete, before its failure. The maximum deflection around loading zone was 0.815 mm, this show that another nonlinear responses have not been taken into account. This simplified analysis will be a proper-useful way to design a GLARC structural system.