CAJ | 학술논문

为满足朔黄铁路T梁提载要求，针对桥梁的特点和构造，采用新型体外预应力体系对其进行强化加固。该体系的锚具、预应力束和转向器均与普通体外预应力不同，预应力损失不能直接按现行规范进行计算。通过24 m足尺梁张拉试验，利用IMC数据采集系统动态记录体外预应力筋在张拉过程中有效应力的整个变化过程，简捷准确地获取了新型体外预应力体系锚固损失、摩擦损失的试验数据。研究结果表明：体外预应力锚固损失为0．98％σcon，摩擦损失为1．6％σcon，摩擦因数μ为0．063。试验结果为该新型预应力体系的设计和施工提供了有效计算依据，也为今后改善体外预应力结构体系提供了参考。
위만족삭황철로T량제재요구，침대교량적특점화구조，채용신형체외예응력체계대기진행강화가고。해체계적묘구、예응력속화전향기균여보통체외예응력불동，예응력손실불능직접안현행규범진행계산。통과24 m족척량장랍시험，이용IMC수거채집계통동태기록체외예응력근재장랍과정중유효응력적정개변화과정，간첩준학지획취료신형체외예응력체계묘고손실、마찰손실적시험수거。연구결과표명：체외예응력묘고손실위0．98％σcon，마찰손실위1．6％σcon，마찰인수μ위0．063。시험결과위해신형예응력체계적설계화시공제공료유효계산의거，야위금후개선체외예응력결구체계제공료삼고。
In order to meet the requirements of T bridge for increasing load on the Shuohuang railroad,a new type of external prestress system was adopted to strengthen the bridge according to its characteristics and forma-tion.The anchorage,prestressed tendons and steering gear of the new system were different from common exter-nal prestress system,so the loss of prestress can not be directly calculated according to the current specification. The IMC system was utilized to record the whole process of the change of effective stress in external prestressed reinforcement and all data of anchoring loss,friction loss was obtained accurately and quickly.The experimental results show that,a full-scale beam of 24 m span reveals that the anchoring loss is 0.98%,the friction loss is 1.6% with the friction coefficient equal to 0.063.The test results not only provide a reference for this new sys-tem and also afford a basis for improving the design of the external prestressed structure in the future.