Please Active Javascript

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Ads

`) jQuery("#myTA").click(function() { this.focus(); this.select() }); var ta = document.getElementById('myTA'); // ta.addEventListener('copy', onCopyEvent); // ta.addEventListener('cut', onCopyEvent); ta.value = ''; clipboardDiv = document.createElement('div'); clipboardDiv.style.fontSize = '12pt'; // Prevent zooming on iOS // Reset box model clipboardDiv.style.border = '0'; clipboardDiv.style.padding = '0'; clipboardDiv.style.margin = '0'; // Move element out of screen clipboardDiv.style.position = 'fixed'; clipboardDiv.style['right'] = '-9999px'; clipboardDiv.style.top = (window.pageYOffset || document.documentElement.scrollTop) + 'px'; // more hiding clipboardDiv.setAttribute('readonly', ''); clipboardDiv.style.opacity = 0; clipboardDiv.style.pointerEvents = 'none'; clipboardDiv.style.zIndex = -1; clipboardDiv.setAttribute('tabindex', '0'); // so it can be focused clipboardDiv.innerHTML = ''; document.body.appendChild(clipboardDiv); function onCopyEvent(e) { e.preventDefault(); copyToClipboard(getTextAreaSelection(e.target)); // copy text // copyToClipboard(getTextAreaSelection(e.target)) // copyHtmlToClipboard(getTextAreaSelection(e.target)); // html } // function copyHtmlToClipboard(html) { // clipboardDiv.innerHTML = html; // var focused = document.activeElement; // clipboardDiv.focus(); // // window.getSelection().removeAllRanges(); // // var range = document.createRange(); // // range.setStartBefore(clipboardDiv.firstChild); // // range.setEndAfter(clipboardDiv.lastChild); // // window.getSelection().addRange(range); // var ok = false; // try { // if (document.execCommand('copy')) ok = true; // else utils.log('execCommand returned false !'); // } catch (err) { // utils.log('execCommand failed ! exception ' + err); // } // focused.focus(); // } function getTextAreaSelection(elem) { var selectedText; if (document.selection != undefined) // IE version { elem.focus(); var sel = document.selection.createRange(); selectedText = sel.text; } else if (elem.selectionStart != undefined) // Mozilla version { var startPos = elem.selectionStart; var endPos = elem.selectionEnd; selectedText = elem.value.substring(startPos, endPos) } return selectedText; } function copyToClipboard(text) { if (window.clipboardData && window.clipboardData.setData) { // Internet Explorer-specific code path to prevent textarea being shown while dialog is visible. return window.clipboardData.setData("Text", text); } else if (document.queryCommandSupported && document.queryCommandSupported("copy")) { var textarea = document.createElement("textarea"); textarea.textContent = text; textarea.style.position = "fixed"; // Prevent scrolling to bottom of page in Microsoft Edge. document.body.appendChild(textarea); textarea.select(); try { return document.execCommand("copy"); // Security exception may be thrown by some browsers. } catch (ex) { console.warn("Copy to clipboard failed.", ex); return false; } finally { document.body.removeChild(textarea); } } }

Design Of One Way Slab, Design Of RCC Slab

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Step NO. 01: Sizes

h = l/24 × (0.4+fy/100000) = 4″ (Minimum by ACI for end span

y h = l/28 × (0.4+fy/100000) = 3″ (Minimum by ACI for interior span)

End span governs. Finally take assumed h = 6″

Effective depth (d) = hf – 0.75 – (3/8)/2 = 5″ (for #3 main bar)

Step NO. 02: Loads

Step NO. 03: Analysis

Bending moment diagram for slab

Step NO. 04: Design

Calculate Moment Capacity Provided by Minimum Reinforcement in Slab:

Asmin = 0.002bhf = 0.002 × 12 × 6 = 0.144 in2/ft

ΦMn = ΦAsminfy (d-a/2) = 0.9 × 0.144 × 40 × (5-0.188/2) = 25.4 in-k/ft

Φ Mn calculated from Asmin is > all moments calculated in Step No 3.

Therefore As = Asmin = 0.144 in2/ft (#3 @ 9.166″ c/c)

This will work for both positive and negative steel as Asmin governs.

Main Reinforcement Spacing:

Maximum spacing for main steel reinforcement in one way slab according to ACI 7.6.5 is minimum of:

3hf = 3 × 6 =18″

18″ z Finally use, #3 @ 9″ c/c.

Shrinkage Steel or Temperature Steel (AST):

Ast = 0.002bhf Ast = 0.002 × 12 × 6 =0.144 in2/ft

Shrinkage reinforcement is same as main reinforcement, because:

Ast = Asmin = 0.144 in2

Maximum spacing for temperature steel reinforcement in one way slab according to ACI 7.12.2.2 is minimum of:

5hf =5 × 6 =30″ OR 18″ z Therefore 9″ spacing is O.K.

Step NO. 05: Drafting

Main reinforcement = #3 @ 9″ c/c (positive & negative)

Shrinkage reinforcement = #3 @ 9″ c/c

Supporting bars = #3 @ 18″ c/c

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