360R-06 Design of Slabs-on-Ground
Table 4.3—Stress ratio versus allowable load
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- 360R-22 ACI COMMITTEE REPORT
| Table 4.3—Stress ratio versus allowable load
repetitions (PCA fatigue curve) * Stress ratio Allowable load repetitions Stress ratio Allowable load repetitions <0.45 Unlimited 0.73 832 0.45 62,790,761 0.74 630 0.46 14,335,236 0.75 477 0.47 5,202,474 0.76 361 0.48 2,402,754 0.77 274 0.49 1,286,914 0.78 207 0.50 762,043 0.79 157 0.51 485,184 0.80 119 0.52 326,334 0.81 90 0.53 229,127 0.82 68 0.54 166,533 0.83 52 0.55 124,523 0.84 39 0.56 94,065 0.85 30 0.57 71,229 0.86 22 0.58 53,937 0.87 17 0.59 40,842 0.88 13 0.60 30,927 0.89 10 0.61 23,419 0.90 7 0.62 17,733 0.91 6 0.63 13,428 0.92 4 0.64 10,168 0.93 3 0.65 7700 0.94 2 0.66 5830 0.95 2 0.67 4415 0.96 1 0.68 3343 0.97 1 0.69 2532 0.98 1 0.70 1917 0.99 1 0.71 1452 1.00 0 0.72 1099 >1.00 0 * Thickness Design for Concrete Highway and Stress Pavements, EB109.01P, Portland Cement Association, Skokie, Ill. (1984). Fig. 5.1—Appropriate locations for joints. 360R-22 ACI COMMITTEE REPORT Fig. 5.2—Typical isolation joints at tube columns. Fig. 5.3—Alternate (pinwheel) isolation joint and suggested concrete fill at wide flange columns. Fig. 5.4—Typical isolation joint around equipment foundation. material should extend the full depth of the slab and not protrude above it. Where the joint filler will be objectionably visible, or where there are wet conditions or hygienic or dust- control requirements, the top of the preformed filler can be removed and the joint caulked with an elastomeric sealant. Two methods of producing a relatively uniform depth of joint sealant are as follows: 1. Score both sides of the preformed filler at the depth to be removed using a saw. Insert the scored filler in the proper location and remove the top section after the concrete hardens by using a screwdriver or similar tool. 2. Cut a strip of wood equal to the desired depth of the joint sealant. Nail the wood strip to the preformed filler and install the assembly in the proper location. Remove the wood strip after the concrete has hardened. Alternatively, a premolded joint filler with a removable top portion can be used. Refer to Fig. 5.2 and 5.3 for typical isolation joints around columns. Figure 5.4 shows an isolation joint at an equipment foundation. Isolation joints for slabs using shrinkage-compensating concrete should be treated as recommended in ACI 223. tải về 2.35 Mb. Chia sẻ với bạn bè của bạn:
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