As a Structural Bridge Engineer, analyzing, design and review of prestress girders is part of my everyday assignments. To make my life easy, I have made my own spreadsheets as well as finite element tools to complete above tasks. Design or review, my approach is two way. 1. Spreadsheet 2. Finite Element Model - either using commercially available software Midas Civil, Bridge ...
Sometime back, I came across a problem to provide a shoring solution for an excavation.The Client requested a cost effective solution to retain 7 m of earth in a deep excavation. I provided below mentioned two options with cost comparison. 1. Driving of steel sheet pile2. Soldier piles. Option -1 was economical and technical feasible as owing to existence of ...
http://www.preethamgranites.com/cracks-building-foundation-settlement/Providing structural solutions for differential settlement is a challenge that face by many structural Engineers during their career.Generally ,allowable differential settlement is 20mm ,maximum, between two adjacent columns. This is based on the 75% of the maximum allowable cumulative settlement for shallow foundations of 25mm. Below are few general solutions that widely used to cope the differential settlement problems;11.)Provision of
Question ( Reader from Contractor Blog)Questionif i get a core sample of concrete in a newly built existing structure and found out based on laboratory test that the compresive strength of the sample is below 3000psi, does it conclude that the structure is unsafe or structurally unsound.Are there other factors needed to be considered in determining structural soundness of the ...
In bored pile construction , there are few widely spread methods in stabilizing the bored hole. This post discusses these methods in summary.The most common and economical solution is to use bentonite and the main idea behind using bentonite is to stabilize the bored hole. Owing to the high density, it prevents water inflow to the hole. However, if it ...
Question : Many engineers in SL simply neglect the skin friction ( not negative SF) of the end bearing piles. Obviously it leads to lager diameter and greater cost but safe design..Generally, here, the cast in situ piles are considered as end bearing piles and are normally socketed in to bed rock.However recently I saw a pile design which I ...
The concept of ‘Redistribution of Moments’ which is found in structural design is often not well understood, specifically among undergrads.Furthermore it is mostly confused with another widely used concept of ‘Moment Distribution’ which is an essentially a method used to find the BM & SF in structurally indeterminate Beams & Frames. The Redistribution of Moment is subjected only to moments ...
In the last post, I assured that I will write on the measures which we took, conforming the enhance protection of the bridges and embankments against damages caused by scour. After a devastating rainy season which happened during the project implementation, we were convinced on the additional requirements of the protection measures which were not included in the original designs. ...
Even in a dry season , very few water paths are get dry as following one where not single drop of water can be found.This bridge is located in Mankulam - Mulathive road, where I worked as the Consulting Bridge Engineer in 2012A Bridge on a river where you can not find a single drop of water.While during the time ...
I caught this video from FB post..........This video shows the importance of the correctly design HYDRAULIC JUMP at the spill.I can remember the effort of my Hydraulic Professor who took great effort to teach us the phenomena during my undergraduate studies. The hydraulic jump is designed to dissipate the energy of the water flow, so that it flows in safe speeds inthe downstream.
I came across this problem last year. Although the issue has been solved, still I think we can share our views on this.The problem occurred on 19m long pre tensioned PSC beam. The cracks, in the range of 0.2 mm – 0.5 mm, were noticed on the top flanges of the 19 m beams and near the two lifting positions ...
Last few days, I spent my working time mostly on reviewing the designs of concrete box culverts.As local practice is based on British codes, the most relevant document is identified as part 2 & part 4 of Bs 5400. The additional guidelines are provided by BD 31/01.Appendix A of BD 31/01 shows the diagrams on load cases which is to ...
I came across this problem few months ago. Although the issue has been solved, still I think we can share our views on this.The problem occurred on 19m long pre tensioned PSC beam. The cracks, in the range of 0.2 mm – 0.5 mm, were noticed on the top flanges of the 19 m beams and near the two lifting ...
In structural engineering, the Flat Slab is identified as a slab which is supported generally without beams by columns with or without column heads. However, I have understood that Flat Slab designs are not quite popular in Sri Lanka, may be owing to its complexity in design, detail and construction. But things what I am going to discuss here are ...
