复合拱圈加固圬工拱桥正截面承载力试验研究

摘要

In order to research on normal section bearing capacity of masonry arch bridge that is strengthened by composite arch ring under cracks of original arch ring,the three sectional models of masonry arch bridge strengthened by composite arch circle are designed,considering the cracks of original arch ring and the mechanical properties of different materials,numerical simulation and experimental research are carried out based on common stress and deformation coordination between the original arch ring and reinforced layer.The results show:When the crack width is 1/4 original arch width,the bearing capacity is 14.5% less than the non crack arch segment;When the crack width is 1/2 original arch width,the bearing capacity is 3 7 .3% less than the non crack arch segment;The bearing capacity decreases in proportion of the increased crack width.%为了研究原拱圈在裂缝作用下，复合拱圈加固圬工拱桥的正截面承载力计算问题，建立了3个复合拱圈加固圬工拱桥节段模型，考虑原拱圈的裂缝和不同材料的力学性能，基于原拱圈和加固层共同受力和协调变形，进行了数值模拟和试验研究．结果表明：当裂缝宽度为原拱圈宽度1／4时，实测承载力比无裂缝拱段减少了14．5％；当裂缝宽度为原拱圈宽度1／2时，实测承载力比无裂缝拱段减少了37．3％，裂缝增大使承载力成比例减小．