Uplift Capacity of Pipe Foundation for Single-span Greenhouse

Choi, Man-Kwon; Woo, Koan Sik; 김하늘,; Lee, Siyoung; Yu, Chan; YongCheolYoon,

doi:10.12791/ksbec.2015.24.2.069

Cited by 4 publications

(8 citation statements)

References 2 publications

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“…The γ d refers to the unit weight of the soil measured in the field, and γ d,max represents the maximum dry unit weight that is achieved in the lab by compaction tests with a specific compaction type. In previous studies, the CR was used to represent the compaction level of soil [10,14,[24][25][26][27]. Those studies commonly used compaction type A to estimate γ d,max and decide the CR.…”

Section: Soil Compaction Meter Testmentioning

confidence: 99%

“…In this section, we compare the R pull-out of rebar stakes to that of other foundation types, including rafter pipe, spiral steel peg, spiral bar, and continuous pipe foundations, as evaluated in previous studies [10,14,24,25]. Each foundation type is visually shown in Figure 19.…”

Section: Comparison Of Pull-out Resistance With Other Foundation Typesmentioning

confidence: 99%

“…Previous studies have examined various greenhouse foundation systems [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. In South Korea, several studies examined the pull-out resistance of continuous pipe foundations compared with other types of foundations using a soil container [25][26][27]. Lim et al [26] evaluated the pull-out resistance of continuous pipe foundations, spiral foundations, and top foundations with varying embedment depths and the soil types (i.e., silty sand, low plasticity silt, and clayey sand).…”

Section: Introductionmentioning

confidence: 99%

“…They found that the maximum pull-out resistance was highest for the independent concrete foundations, followed by continuous pipe foundations and spiral foundations [27]. Choi et al [25] tested the pull-out resistance of continuous pipe foundations and rafter pipes with various soil types (rice pad soil and reclaimed land soil), compaction rates, and embedment depths. The higher the compaction rate and the deeper the embedment depth, the greater the pull-out resistance for all foundations and soil types.…”

Section: Introductionmentioning

confidence: 99%

“…For both types of foundations, the differences in capacities between the two soil types were not significant. Choi et al [25] reported that if a higher compaction rate is applied, the continuous pipe foundation will be effective against pull-out force regardless of soil type. Lee et al [16] used a numerical analysis to evaluate the pull-out resistance of continuous pipe foundations, individual pipe, spiral foundations, and top foundations under uplift load and stated that greenhouses using individual pipe foundations require essential reinforcement.…”

Section: Introductionmentioning

confidence: 99%

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Pull-Out Resistance of Rebar Stake Depending on Installation Conditions and Compaction Levels of Agricultural Soil

Heo,

Choi,

Lee

et al. 2024

Horticulturae

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Strong winds, particularly in the absence of disaster-resistant designs, significantly impact the stability of greenhouse foundations and eventually lead to structural damage and potential harm to crops. As a countermeasure, rebar stakes are commonly used to reinforce the foundations of non-disaster-resistant greenhouses. This study evaluates the pull-out resistance (Rpull-out) of rebar stakes considering various factors like soil compaction, embedded length, installation duration and angle, and changes in soil water content against uplift pressure by strong winds. A combination of field (i.e., the cone penetration test and rebar stake pull-out test) and laboratory (i.e., the compaction test, soil compaction meter test, and soil box test) tests are performed for the assessment of Rpull-out. The results indicate that Rpull-out increases with higher soil compaction, greater embedded length, longer installation duration, and an inclined installation angle. The soil compaction exerts the most significant impact; 90% to 100% of the soil compaction rate has approximately 10 folds higher Rpull-out than the 60–70% compaction rate. If the embedded length is increased from 20 cm to 40 cm, there is a two-fold increase in the average of Rpull-out. Inclined installation of rebar stakes increases Rpull-out by 250% to 350% compared to vertical installation, and rebar stakes installed prior to the uplift event have 1.5 to 6.4 fold increases in Rpull-out than those with instant installation. Additionally, we observed variations in the surface soil moisture due to climatic changes introducing variability in Rpull-out. These findings lead to the proposition of efficient rebar stake installation methods, contributing to the enhanced stability of a greenhouse.

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