Calculation method of flexural capacity at lap joints of steel bar in underground diaphragm wall

Abstract

The invention discloses a method for calculating the flexural capacity of an underground diaphragm wall steel bar lap joint. The specific steps include: according to the flexural damage characteristics of the diaphragm wall joint, determining the flexural limit damage design state of the joint, and passing the steel bar drawing test or theoretical formula to calculate the anchoring force distribution position function at the anchorage end of the steel bar; calculate the upper and lower limits of the bending resistance at any section of the single-bar anchorage section; Upper and lower limits of bending capacity. The present invention proposes a whole set of calculation method for the design and calculation of the bending resistance of the joint section of the steel bar lapped continuous wall, which provides a theoretical basis for the optimal design of the continuous wall joint section. The critical spacing of the mutual influence of the connected steel bars is established, and the theoretical calculation method of the reduction coefficient is established when the mutual influence is established, so that the design can be optimized even when there is no test value.

Description

Technical field[0001]The present invention relates to the design calculation of underground engineering, and in particular to a method of calculating the bending capacity at the underground continuous wall reinforcing joint.Background technique[0002]As the common form of the deep base pit support structure, the underground continuous wall can be applied to a variety of complex geological conditions, the construction quality is reliable, the construction period is short, the noise is small, the construction is small, which can be carried out in a limited space, easy It is close to both buildings for construction in cities with high-density buildings, and the overall performance of the underground continuous wall is high, the stiffness is large, and the stress is small, and the anti-seepage effect is good. The underground continuous wall can not only support the role while excavation of the foundation pit, but also as the main structure of the ground outdoor wall, which is more and mo...

AI Technical Summary

Problems solved by technology

However, when used as the main structure, the bending strength of its joints is difficult to design and control, which becomes the weak point of the wall cracking

The joints using steel bar lap joints to transfer bending moments are simple in construction, easy to operate, and low in cost. They have become a common form of joints for underground diaphragm walls. At present, the current design codes have not clearly stipulated the mechanical properties and calculation methods of underground diaphragm wall joints. , the lack of a calculation method for the bending resistance of the section of the lap steel joints of the underground diaphragm wall hinders the development of the underground diaphragm wall as a permanent main structure

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