Three requirements must be met in the design of uplift pile: first, the foundation of uplift pile must be safe and applicable; Secondly, the design of uplift pile foundation must be reasonable; Thirdly, the design of uplift pile foundation must be economical. These three requirements are equally important and restrict each other.
The safety requirements of disturbed pile foundation design include two aspects: one is that the interaction between uplift pile foundation and foundation soil is stable, and the other is that the structural strength of uplift pile foundation is sufficient. The former requires the uplift pile foundation to have enough uplift bearing capacity under the design load, while ensuring that the uplift pile foundation will not produce excessive displacement and deformation, while the latter requires that the internal force of the uplift pile foundation structure must be within the allowable range of material strength.
The rationality of uplift pile foundation design requires the selection of bearing layer, geometric size and layout of uplift pile to give full play to the best bearing capacity of uplift pile foundation. In the design, the strength grade and reinforcement ratio of uplift pile body materials are determined according to the accurate internal force calculation results, which not only meets the structural requirements, but also does not exceed the material, whether it is whole or part. At the same time, the design result should be feasible and convenient for construction: the design result conforms to the use function of the building.
The economic requirement of uplift pile foundation design refers to the use of advanced technology and means to fully grasp the characteristics of uplift pile foundation, and to seek the best design scheme through the comparison of multiple schemes, so as to maximize the bearing capacity of uplift pile foundation and strive to minimize the design cost of uplift pile foundation.
The bearing capacity of pile foundation mainly depends on the characteristics and resistance of foundation soil, and the composition of foundation soil is complex and the spatial distribution is extremely uneven, and the site soil index has great randomness, discreteness and variability. From the point of view of probability, it is impossible for a limited number of foundation investigation indexes to accurately represent the site soil, so the bearing capacity of uplift piles determined by this method is very random. In the past, in the design of uplift pile foundation, it was customary to determine the design value of uplift pile foundation bearing capacity through personal experience and a certain safety factor. Many analyses show that the safety factor is unsafe, because it can not reflect the random variability of load, site soil, the error of bearing capacity design method and other factors.
The above is the introduction of uplift pile design provided by Zhong Da Consulting for architects. For more information about architectural terminology, please pay attention to the architectural knowledge column of Zhong Da Consulting.
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