Adhesive Anchors in Concrete Under Sustained Loading Conditions (2009) / Chapter Skim
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Pages 45-65
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From page 45... ...
45 The purpose of this chapter is to describe the procedures used to reduce the experimental data into usable results. This included determining the mean static load from the 110°F static load test and the time to failure from two series of 110°F sustained load (creep)
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46 Anchor Number Range Type of Test Test Description 1 – 6 Static Load Test 110°F reference test 7 – 9 Sustained Load Test 75% peak load at 110°F 10 – 12 Sustained Load Test 62% peak load at 110°F 13 – 18 Static Load Test 75°F reference test Table 14. Anchor numbering.
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47 a point with a displacement of 0.1 in. While the 0.1-in.
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48 For the 110°F static load tests, Adhesives B and C exhibited lower maximum static loads under the incremental load rate than they exhibited under the continuous load rate. This trend was not observed in the 75°F static load tests to any great extent statistically.
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49 Anchor Static Load Strength (lbf) Static Bond Stress (psi)
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50 Anchor Static Load Strength (lbf) Static Bond Stress (psi)
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51 0 5,000 10,000 15,000 20,000 25,000 0 0.02 0.04 0.06 0.08 0.1 0.12 DISPLACEMENT (in)
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52 0 5,000 10,000 15,000 20,000 25,000 0 0.02 0.04 0.06 0.08 0.1 0.12 DISPLACEMENT (in)
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53 0 5,000 10,000 15,000 20,000 25,000 0 0.02 0.04 0.06 0.08 0.1 0.12 DISPLACEMENT (in)
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54 Anchor Static Load Strength (lbf) Static Bond Stress (psi)
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55 Anchor Static Load Strength (lbf) Static Bond Stress (psi)
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56 20 s for the 75% tests. This schedule of recording was increased to about every 3 s for the 62% test.
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57 method was rejected due to the inherent difficulty of reproducing it among laboratories. • High-order polynomial regression analysis.
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58 • The load was applied to anchors in the static load test, and the initial load was applied to the anchors in the sustained load (creep) test within 2 min ±1 min • The time to failure for all tests included the loading time.
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59 Anchor Load (lbf) Percent Load (%)
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60 and displacements at 3,026 hours in order to approximate these points on the stress versus time-to-failure graph (see Figure 46)
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61 Position Anchor Initial Load Spring Stiffness End of Initial Loading Initiation of Tertiary Creep Displacement Loss in Load Failure Load (lbf)
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62 62% Sustained Load Test The percent loads for the 62% sustained load (creep) test were recalculated based on the new mean static load calculated from the two incrementally loaded tests and are presented in Table 42.
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64 Statistical Parameter Adhesive A 62% - 3,026 Adhesive A 62% - 10,000 Adhesive B continuous load rate hourshours Adhesive B incremental load rate R2 of trendline 0.76 0.75 0.92 0.85 Correlation coefficient (R) 0.87 0.87 0.95 0.92 Number of Samples 10 10 10 8 Confidence of Trend 99% 99% 99% 99% Mean percent difference 7% 9% 4% 15% Time to Failure (years)
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65 that load levels higher than 80% of mean static load not be chosen. In addition to avoiding rapid failure, setting this upper bound will ensure that the loads are well outside of any reasonable statistical variation on the mean static load.
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