PDF(4048 KB)
Mechanical Property of Full-Width Prestressed Precast Bridge Deck Composite Beams Under Negative Bending Moment
CHEN Juan, YAN Kai, LI Yifeng, WU Hao, LI Zhijun
PDF(4048 KB)
PDF(4048 KB)
Mechanical Property of Full-Width Prestressed Precast Bridge Deck Composite Beams Under Negative Bending Moment
Compared with block precast bridge deck， transverse full-width prestressed precast bridge deck has better integrity， faster construction， and a better application prospect in assembled composite beam bridge. The wet joint connection of the precast bridge deck under negative bending moment is the key part of the composite beam. Therefore， the mechanical properties of full-width prestressed precast bridge deck composite beam under negative bending moment are studied， the influence of the number of transverse prestressed bars， the arrangement of prestressed bars， the degree of shear connection and the materials at the joints on the mechanical properties such as structural failure mode， cracking load， bending bearing capacity and load-displacement curve is made clear， and the stress distribution at the joints of precast slabs is revealed. An improved effective moment of inertia superposition method for deflection calculation of precast bridge deck composite beams with complete shear connection is proposed， which considers the influence of longitudinal and transverse prestress and is in good agreement with the numerical results. For composite beams with partial shear connection， the domestic and foreign codes are compared， and it is concluded that the Standard for Design of Steel Structures in China is more applicable.
transverse full-width precast bridge deck / composite beam / prestress / negative bending moment / refined finite element simulation / improved effective moment of inertia superposition method
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