Abstract
Precast high-strength concrete segmental beams with external tendons and dry joints (ED-PHCSBs) have become a potential alternative for achieving accelerated bridge construction due to their lighter self-weight and easier installation. In order to investigate the shear behavior of ED-PHCSBs, eight precast concrete segmental specimens were fabricated and tested to failure. For comparison purposes, one externally prestressed high-strength concrete monolithic beam was also investigated. The primary parameters, including concrete strength, shear span-depth ratio, stirrup ratio, joint number, and joint location, were adopted. Test results indicated that increasing the concrete strength or stirrup ratio can effectively improve the shear capacity of the ED-PHCSBs. The shear span-depth ratio was inversely proportional to shear strength for all specimens. The results also revealed that the joint number had a marginal effect on the defections and stresses of the external tendons of ED-PHCSBs. AASHTO 2017 and Chinese code 2018 can conservatively estimate the shear strength of ED-PHCSBs. Considering the actual failure modes of the precast beams, a calculation method based on a modified strut-and-tie model was proposed. The average and standard deviation of the ratios of the test results to the predicted value of the proposed method were 0.98 and 0.08, respectively. It indicated that the proposed formula was more accurate.
Highlights
For more than 40 years, precast concrete segmental bridges (PCSBs) have been constructed widely, owing to the demand for their economical design and increased speed of erection
Experimental studies of nine beams with T cross-sections were conducted to investigate the effect of concrete strength, shear span-depth ratio, stirrup ratio, joint number, and joint location on the shear behavior of ED-PHCSBs
The initial web-shear cracks of the segmental beams occurred from the root of the shear keys
Summary
For more than 40 years, precast concrete segmental bridges (PCSBs) have been constructed widely, owing to the demand for their economical design and increased speed of erection. These bridges have been recognized as a solution to many bridge problems due to improved quality control, mitigation of traffic disturbances, and superior durability. The first application of PCSBs was Long Key Bridge [1]. Several famous projects of PCSBs have been built in China, such as Sutong Yangtze River Bridge, Nanjing No.. Yangtze River Bridge, Zhuhai-Macau Lotus Bridge [3], and Humen Second Bridge [4]
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