## 1 Introduction
(2017) to investigate the tensile behavior of a newly developed uncoated strand according to various types of mono anchorages and appropriate anchorages for both strands were proposed. Considering the deformations due to anchorage slip, [PERSON] et al. (2017) studied the influence of bond slip on the seismic behavior of RC structure using nonlinear dynamic and static pushover analysis. [PERSON] et al. (2017) studied the stress distribution and stress transfer mechanism of the cable-to-girder anchorage structure of tensile anchor plate type under the designed load. The results of the test and analysis indicated that the cable-to-girder anchorage structure could meet the requirements of the designed bearing capacity. For existing problems in Near Surface Mounted (NSM) technique, a promising approach for flexural strengthening of RC members, U-wrap end anchorage with carbon fiber reinforced polymer (CFRP) fabrics, was proposed by [PERSON] et al. (2017) to eliminate the concrete cover separation failure. An experimental investigation was presented by [PERSON] et al. (2017) to show the flexural behavior of continuous two-span unbonded post-tensioned high strength concrete (HSC) beams, strengthened by end-anchored CFRP laminates of different configurations in the hogging region. [PERSON] et al. (2017) investigated reasons for crack growth in the anchorage zones after detension. In this study, differential cooling, creep, and shrinkage of bulb-tee cross sections are studied as potential reasons of crack growth. [PERSON] and [PERSON] et al. (2017); [PERSON] et al. (2017); [PERSON] et al. (2017); [PERSON] et al. (2017); [PERSON] et al. (2017); [PERSON] et al. (2017); [PERSON] et al. (2017); [PERSON] et al. (2017); [PERSON] et al. (2017) conducted experiments and comparisons between experimental results and design-equation predictions to determine the effects of steel-fiber and rebar reinforcements on the ultimate bearing strength of the local anchorage zone. The test and the comparisons between the design-equation predictions and the test results showed that the ultimate bearing strength and the section efficiency were highly affected by the reinforcement details and the concrete strength. Through theoretical analysis, numerical simulation and experimental validation, high order longitudinal guided waves (HOLGW) were studied by [PERSON] et al. (2017) for damage detection in the anchorage zone of stayed cable. Although much research has been conducted on anchorage zone, especially the new anchorage devices, ultimate capacity, simulation analysis, etc., there are limited studies on stress transfer and distribution of the anchorage zone of post-tensioned prestressed concrete members, in particular, with full scale specimens being applied in tests. Based on the Yichang Yangtze River Bridge, which is the longest continuous rigid frame arch railway bridge in the world, and the first application of this type of bridge in railway transportation, model tests were conducted. It has spans of 130, 275, 275, and 130 m. It is on the China Yi-Wan Railway Line with a design speed of 175 km/h. The bridge is composed of a prestressed concrete rigid frame with box girders, reinforced concrete piers, and two concrete filled steel tube arches at the two internal spans, as depicted in Figure 0(a). Section A-A of the main girder, as illustrated in Figure 0(b), was considered due to its thinner top and bottom slabs resulting in remarkable local bearing pressure effect. For a long-span prestressed concrete continuous rigid frame arch bridge, optimizing arrangement of prestressing tendons in the box beam is a key issue. It is very prone to cracks, affecting the durability and even the normal service due to the relative restricted distance between the prestressed ducts and anchorage device, and the small cross-section of the box beam [3]. In addition, compared with other sections, stress concentration is more serious in the mid-span because of comparatively thinner top and bottom slabs.