Calculation Method of Bending Bearing Capacity of Normal Section after Partial Destruction of Circular Section Surrounding Pile

Abstract

The invention discloses a calculation method of bending resistance bearing capacity of a normal section of a circular cross section fender post after partial fracture. The calculation method comprisesthe following steps that step 1, discretely and uniformly distributed steel bars in the fender post are equivalent to continuous steel rings with an equal thickness, and the thickness t<s> of the equivalent steel rings is calculated; step 2, a equilibrium equation of resultant compressive stress D<c> of section concrete and tensile force D<s>of section steel bar is established, and the height coefficient epsilon of a section compressive zone of the circular cross section fender post after the partial fracture is calculated according to the equilibrium equation; and step 3, the bending resistance bearing capacity M<c> of the remaining section of the circular cross section fender post after the partial fracture and the bending resistance bearing capacity M<s> of the steel bars are calculated, and finally the bending resistance bearing capacity M<pu> of the normal section of the circular cross section fender post after the partial fracture is calculated, and M<pu>=M<c>+M<s>. The calculation method is clear in thinking and reliable in results, can be used for safety analysis of structures of the circular cross section fender post after the partial fracture in the actual engineering, and provides a direct reference for the safety evaluation of a foundation pit under similar conditions and further treatment methods, and improves engineering safety factors.

Description

technical field [0001] The invention relates to a calculation method for the bending resistance capacity of the normal section of a circular section reinforced concrete enclosure pile, in particular to a calculation method for the bending bearing capacity of the normal section after the circular section enclosure pile is partially broken. Background technique [0002] The surrounding protection pile plus internal support structure system is a commonly used support method for open-cut deep foundation pits, and the circular cross-section bored pile is the main type of surrounding protection pile foundation. [0003] In the actual construction process, due to the influence of ground conditions, drilling rig equipment, etc., the verticality deviation of piles often occurs, and even invades the boundary of the main structure. At this time, in order to ensure the dimensional requirements of the main structure, it is necessary to chisel out the enclosure piles intruding into the bo...

AI Technical Summary

Problems solved by technology

[0005] At present, there are clear regulations on the calculation method of the normal section flexural bearing capacity of the complete circular section enclosure piles, but there is no clear calculation method for the normal section flexural bearing capacity of the circular section enclosure piles after partial destruction, so there are potential safety hazards

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