无腹筋沙漠砂混凝土深梁抗剪性能研究  

RESEARCH ON SHEAR PERFORMANCES OF CONCRETE DEEP BEAMS MIXED WITH DESERT SAND WITHOUT WEB REINFORCEMENT

作　　者：秦拥军[1,2] 李向阳 崔壮[1] 王博 QIN Yongjun;LI Xiangyang;CUI Zhuang;WANG Bo(School of Architecture and Engineering,Xinjiang University,Urumqi 830047,China;Xinjiang Civil Engineering Technology Research Center,Urumqi 830047,China)

机构地区：[1]新疆大学建筑工程学院,乌鲁木齐830047 [2]新疆土木工程技术研究中心,乌鲁木齐830047

出　　处：《工业建筑》2021年第9期98-105,共8页Industrial Construction

基　　金：自治区高校科研计划自然科学项目(XJEDU20171003);兵团科技攻关项目(2019DB004)。

摘　　要：为了对沙漠砂混凝土深梁受剪性能进行研究,对8根无腹筋沙漠砂混凝土深梁进行集中荷载作用下的受剪试验,分析剪跨比、配筋率和沙漠砂掺量对深梁试件的跨中挠度、开裂荷载、极限荷载、混凝土应变和钢筋应变的影响规律以及深梁的破坏形态和裂缝发展情况。试验结果表明:试件破坏时已不符合平截面假定,极限荷载随着剪跨比的增加而减小,随着配筋率的增加而增大,随沙漠砂掺量的增加先增大后减小,沙漠砂掺量为20%时最大;在相同荷载作用下跨中挠度随着剪跨比、配筋率和沙漠砂掺量的增大先增大后减小。并对GB 50010—2010《混凝土结构设计规范》以及美国、加拿大和欧洲标准的深梁计算方法进行修正,最后得出沙漠砂深梁抗剪承载计算式。The shear performances of concrete deep beams mixed with desert sand were studied,the shear tests for 8 concrete deep beams with desert sand without web reinforcement were conducted subjected to concentrated loads,and the laws of shear-span ratios,reinforcement ratios and the content of desert sand on the mid-space deflection,cracking load,ultimate load,concrete strain and rebar strain of deep beams were analyzed,as well as the damage forms and crack evolution.The test results showed that these specimens didn’t conform to the assumption of the plane section when they were damaged.The ultimate load decreased with the increase of shear-span ratios,increased with the increase of reinforcement ratios,increased first and then decreased with the increase of the content of desert sand,and reached its maximum bearing capacity when the content of desert sand was 20%.In the same loads,the mid-span deflection increased first and then decreased with the increase of shear-span ratios,reinforcement ratios and the content of desert sand.The calculation methods of deep beams from Chinese standard GB 50010-2010 and the codes of United States,Canada and Europe were modified,finally the formula for calculating the shear bearing capacity of deep beams mixed with desert sand was proposed.

关 键 词：深受弯构件 受剪性能 挠度 应变 拉压杆模型 

分 类 号：TU37[建筑科学—结构工程]