Leaderboard

All, Here is a very useful website to plot graphs. https://graphsketch.com Thanks.

Dear; If the deflection is excessive you need to increase tension steel (TOP) in cantilever. But if the deflection is less excessive you can reduce it by adding additional compression reinforcement (BOTTOM) in cantilever. What does it mean 1. Increasing compression reinforcement reduces long-term deflection (by small amounts) But it has very very minor effect on I-cracked (I-cracked almost stays same but Long Term Deflection decreases by little amount) 2. Increasing tension reinforcement reduces long-term deflection (by large amounts) But it has major impact on I-cracked (I-cracked increases and Long Term Deflection decreases by same amounts) So it is very clear that long-term deflection can be reduced by increasing I-cracked or in other words tension steel (TOP) in cantilever. But here arises one concern that if you change tension steel (so it will also change I-cracked) which in turn will change analysis and moment attraction. So you have to repeat the calculations. (Thats why we say to add compression reinf to reduce long-term deflection without analysing again). This holds true for continuous structure. For single span, you dont need to re-analyze. If you change I-cracked equally in continuous system you also dont need to reanalyze again. (Very rare). Conclusion If the deflection is huge (which is, i think) then increase tension steel in SAFE. (You can increase compression steel too but it will have very much less effect than tension steel). Hope that helps.