CALCULATION MODEL OF ANCHOR CABLE TENSILE FORCE BASED ON THE COST OF PILE-ANCHOR CABLE STRUCTURE

Designing of pile-anti-slide with anchor cable includes anchor cable tensile force and pile internal force. Pile internal force can be obtained by anchor cable tensile force. The cost of pile structure can be obtained by pile internal force. Then anchor cable tensile force affects the cost of pile-anchor cable structure. Therefore, anchor cable tensile force computing is especially important in the design of pile-anchor cable structure. This paper analyzes and studies the relationship between the cost of pile-anchor cable structure and anchor cable tensile force. It establishes anchor cable tensile force matching with the cost of pile-anchor cable structure calculation models from three aspects of relation curve model, polynomial fitting model and optimized deformation consistence condition model. It combinesm and Kmethods of pile internal force calculation and structural mechanics' principle of virtual work and diagram multiplication method. A calculation programs by Visual C++is complied to calculate the cost of pile-anchor cable structure with different anchor cable tensile force through different case studies. It presents the relation diagrams between the cost of pile-anchor cable structure and anchor cable tensile force. The results show that the cost of pile-anchor cable structure first decreases and then increases with the increase of anchor cable tensile force. Three kinds of model calculation results of anchor cable tensile force matching with the cost of pile-anchor cable structure are very close. Anchor cable tensile force calculated by any method can be considered as the final anchor cable tensile force design value. At this point, the plus and minus extremums of bending moment of pile are not equal. This also shows that anchor cable tensile force is not necessarily the optimal when the plus and minus extremums of bending moment of pile are equal. Although pile body status is ideal at the moment, the cost may be higher, so that economic benefit is poor.