大偏心受压柱

1、同济大学混凝土结构基本原理实验报告（共 9 页）姓名梁炜炼学号1350240专业建筑工程学院土木工程学院指导老师 鲁亮同济大学结构工程与防灾研究所2015年 12月 28日1.1、试验目的通过试验研究认识混凝土结构构件的破坏全过程，掌握测试 混凝土大偏心受压构件基本性能的试验方法。1.2、试验内容对大偏心短柱施加轴向荷载直至破坏。观察加载过程中裂缝的开展情况，将得到的极限荷载与计算值相比较。2. 试件介绍二g21C：4kin.iiW»¥3-gDOxT-ilfct如小 狀OSiiT慟60 »丽22C-J圧料f(J邛裁0 41avs.vB WMW¥ 考LI

2、1由、畑卅(1)试件设计的依据为减少“二阶效应”的影响，将试件设计为短柱，即控制10/h< 5。通过调整轴向力的作用位置，即偏心距e0=200mm使试件的破坏状态为大偏心受压破坏。（2）试件的主要参数 试件尺寸截面尺寸：200X 400mm 两端）；200 x 200mrm（中部）; 试件长度：1300mm 混凝土强度等级：C25 纵向钢筋：8B18（两端）；4B18（中部）。 箍筋：8850（两端）；48100（中部）; 纵向钢筋混凝土保护层厚度：25mm 试件的配筋情况（如上图所示）； 取偏心距e0=200mm3. 试件材料力学性能试验结果钢筋类型钢筋直径/mm面积屈服强度/kN极限

3、强度/kN延伸率（%屈服强度（MPa平均值（MPa极限抗拉强度（MPa平均值（MPa光圆钢412.575.486.0517436.1430.1481.4477.95.335.9620424.1474.3螺纹钢628.2715.6818.0211554.6573.0637.3640.316.7218.1911591.3643.3光圆钢628.2711.3215.4322400.4392.2545.7547.310.8615.5220384.1548.9螺纹钢850.2732.9134.7417654.7646.7691.1691.332.134.7616638.6691.5光圆钢850.2720

4、.6328.6621410.4413.3570.2570.920.9228.7324416.2571.6螺纹钢14153.9482.0995.2523533.3533.6618.8618.482.1895.1518533.9618.1螺纹钢18254.47118.17159.2422464.4467.2625.8624.8119.59158.7424470.0623.8螺纹钢20314.16129.07186.9425410.8414.9595.0596.4131.62187.8126419.0597.8钢筋力学性能试验结果混凝土试块强度试验结果序号试块尺寸荷载（kN）强度（MPa1150*1

5、50*150746.933.22749.133.33737.632.8平均值（MPa33.14. 试件验算柱极限承载力不妨令：A1 fcbh022， B 1fcbh°(e 佗)，CfyAs(h) as)，从而有：B , B24AC2ANeuif cbho2 '' 'Neueifebho (10.5 )fyAs(hos)ee00.5h0.238-as 266mmNeu 261.5KN5. 试验方法5.1加载装置柱偏心受压试验的加载装置如图所示。 采用千斤顶加载，支座一 端为固定铰支座，另一端为滚动铰支座。铰支座垫板应有足够的刚度， 避免垫板处混凝土局压破坏。图5

6、.1柱偏心受压试验加载装置5.2加载方式(1)单调分级加载机制实际的加载等级为 0-20kN-40kN-60kN-80kN-100kN-120kN-破坏5.3量测内容(1)纵筋应变由布置在柱内部纵筋表面的应变计量测，钢筋应变测点布置如下图飞麥胖计8片纵筋A （应变1、3）纵筋C （应变2、4）纵筋B （应变5、7）纵筋D （应变6、6）图531大偏心受压柱试验纵向钢筋应变测点布置(2)侧向挠度柱长度范围内布置5个位移计以测量柱侧向挠度，侧向挠度测点布置如下图。图大偏心受压柱试验侧向挠度测点布置3）裂缝试验前将柱四面用石灰浆刷白，并绘制 50mM 50mm勺网格。试验时 借助放大镜查找裂缝。6

7、试验过程破坏时加载过程中背部首先出现裂缝， 并随着荷载勺不断增大， 不断扩 大，随后与两侧裂缝相连接。破坏后构件破坏主裂缝在上端且裂缝与偏心方向平行， 说明构件本身存 在问题；破坏时， 构件受压处没有明显压碎痕迹；但背部裂缝呈平行 均匀分布，间距基本在10cm与理论分析结果较为符合。7 试验结果分析实际试验数据8 / 13 下载文档可编辑纵筋应变（口 £）位移测量（mm侧向中部侧向上部荷载（kN）12345678卜支座侧冋卜部上支座00000000000000158108135132-85-134-113-1361.07-2.07-0.23-0.3719393296385336-17

8、9-282-221-2911.82-2.03-0.54-0.15-0.5139.25628502627538-264-427-308-4422.48-1.930.080.09-0.6159.5877726878759-363-584-411-6043.16-1.810.790.3-0.6581.2511309611136991-467-744-526-7713.88-1.681.560.45-0.68101.251388120913961239-593-914-661-9454.64-1.522.40.67-0.72121.251433125414451283-628-958-699-9914

9、.86-1.482.620.75-0.73122.51433125514461284-631-962-701-9944.86-1.482.63°.74-0.731231448126714611300-642-974-711-10064.92-1.482.670.75-0.73125.251472128814831323-653-989-722-10214.97-1.482.730.74-0.731281498131315111350-665-1005-735-10395.02-1.452.810.79-0.73130.751527134015401377-679-1021-750-1

10、0545.09-1.442.880.8-0.73133.51554136515661403-690-1038-761-10715.16-1.432.960.85-0.73135.751577139115901427-703-1053-773-10875.22-1.423.050.86-0.73137.751600141416131449-714-1068-785-11035.32-1.43.120.89-0.73139.51621143616341471-727-1082-798-11195.37-1.393.220.86-0.731411643145916581493-738-1098-81

11、1-11345.45-1.373.290.9-0.741431665148216811517-752-1114-824-11505.52-1.353.360.93-0.73144.751687150517051541-766-1131-838-11675.6-1.353.440.96-0.73146.251710152817281564-778-1146-854-11845.67-1.333.53 0.98-0.73148.251736155317531589-793-1165-868-12035.76-1.323.640.95-0.74150.751787160818061643-821-1

12、202-898-12395.91-1.293.831.02-0.75155.251837165818571694-850-1238-929-12766.06-1.244.021.05-0.751591886170519051744-879-1274-959-13136.24-1.214.21.08-0.77162.251933175519531790-908-1308-990-13516.41-1.164.391.15-0.77165.751979180320021840-937-1346-1022-13886.58-1.124.561.2-0.77169.252026185120501887

13、-967-1384-1053-14296.74-1.14.741.23-0.79172.52075190021011936-999-1420-1085-14696.89-1.074.911.25-0.78176.252122194921491985-1029-1460-1117-15087.06-1.035.111.29-0.79179.52167199421952031-1059-1497-1149-15487.22-15.291.35-0.8182.752212204022412076-1090-1535-1180-15877.37-0.965.481.4-0.79186225620862

14、2862121-1122-1572-1212-16277.54-0.945.651.42-0.791892298213023322167-1151-1607-1244-16657.7-0.915.841.45-0.81922341217323752210-1182-1644-1277-17037.87-0.876.021.49-0.8194.752383221524182254-1211-1680-1307-17428.04-0.856.211.55-0.8197.752423225824612294-1240-1715-1338-17798.18-0.86.41.59-0.79200.752

15、463229825032335-1270-1750-1368-18168.35-0.776.571.66-0.8203.252503233625442376-1298-1785-1399-18548.51-0.736.741.62-0.82062539237325822416-1326-1818-1428-18898.69-0.76.921.65-0.8208.52570241325762457-1353-1853-1455-19268.84-0.677.11.69-0.82112601245225952497-1379-1888-1482-19629.01-0.657.291.76-0.82

16、132628249426042538-1405-1922-1507-19989.17-0.67.491.78-0.82152634254325922590-1427-1962-1528-20389.34-0.557.691.84-0.82172626262025362671-1444-2014-1543-20909.53-0.537.91.85-0.81218.252625270324932760-1461-2072-1559-21489.68-0.498.121.93-0.81219.752630276724862827-1482-2124-1579-21989.85-0.478.321.9

17、3-0.812212644274425042658-1515-2170-1608-224410.03-0.448.581.97-0.81220.752645272125162577-1556-2227-1641-230110.19-0.388.872.02-0.8220.52639271125322601-1604-2285-1685-235810.37-0.369.132.09-0.81220.752629270725362645-1650-2343-1738-241510.53-0.329.422.13-0.81221.52634270725432669-1701-2405-1787-24

18、7910.74-0.289.732.19-0.81222.752641270225452656-1764-2420-1850-252010.98-0.2310.132.26-0.81222.752615269725472605-1830-2438-1925-254311.25-0.1810.552.32-0.81222.252576268425512566-1898-2457-2007-256411.51-0.1311.022.42-0.81222.252572266225382504-1958-2464-2084-258711.78-0.0811.472.5-0.81221.52551264

19、425302486-2009-2466-2150-260612.07-0.0111.942.57-0.81220.52560263625252566-2056-2470-2218-263312.330.0112.362.64-0.82202665263425152771-2103-2471-2296-265712.610.0712.782.77-0.81219.52913262825243223-2151-2471-2385-268612.910.1213.212.83-0.82193370260225194240-2198-2470-2479-270613.180.1613.682.99-0

20、.82183760255325495348-2245-2468-2582-272913.460.214.13.06-0.8216.754494250726524432-2295-2468-2694-275513.740.2514.573.1-0.8215.255055247329784018-2359-2466-2896-278914.020.2914.993.24-0.8213.255323246138754057-2370-2458-3007-273114.30.3315.423.33-0.8211.255198249055334015-2381-2454-3003-269714.60.3815.853.44-0.8209.54864259972754032-2390-2448-3014-267614.870.4216.263.57-0.82084861