Design Study On Connection Mode Of Bottom Anchor Block And Anchor Cable Of Pre-Stressed Gate Pier

The pre-stressed gate pier is the key structure of the safe operation of the discharge structure, and its reasonable strtural design is extremely important. At present, the results that the tonnage of the pier structuree is too large and the cable is not completely reasonable designed. In order to improve the stress state of the pre-stressed gate pier and reduce the project cost, the industry has made a lot of research from the size and structure of the pier.However, it is necessary to have an In-depth study wich contains the connection form and anchor parameters of the anchor block at the bottom.The paper, taking the spillway crest outlet pre-stressed gate pier as the object of study,using ANSYS software to build models, mainly from the bottom of the anchor block, the tonnage of the primary and secondary anchors, the number of the main anchor cable and the position of the secondary anchor reasearch. And then put forward a reaasonable design according to the regulations which has already summarized, after that do the calculation and analysis different conditions including the normal retaining, unilateral discharge, both sides of the discharge, maintenance, earthquake and others.It is showed in the results that the connection method at bottom of pre-stessed pier anchor block can make the tensile stress reduced by 10% at the pier neck, when using the contact way rather than the overall connection. Meanwhile, the contact force at the bottom of the anchor block can reduce the tensile stress at the junction of the downstream face and the pier.The increase of the tonnage of the main anchor can enhance the pre-loading effect of the pier and reduce the pier the tensile stress in the upstream face of the anchor block.It has little influence of pre-compressed effect to the pier which comes from the tonnage of the anchor,the stress in the pier neck as almost constant, while the tensile stress of the upstream surface of the anchor block can be reduced. The gross tonnage of main anchor rope keeps invariant,and the increased number of the anchor cable is benefihted to reduce the tensile stress at the end of the anchorage zone. The secondary anchor, which should be arranged as close as the anchor block and the downstream surface. From the results show that the pier design is reasonable, it basically meet the requirements of the stress, and the position where the stress is larger could be solved by stengthening the reinforcement.