大偏心受压柱汇总

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日混凝土结构基本原理实验报告 第1页 共9页1．实验目的和内容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（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l0/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①试件尺寸 2 2200400mm(两端);200×200mm(中部);试件长度：1300mm；②混凝土强度等级：C25混凝土结构基本原理实验报告 第2页 共9页③纵向钢筋：8B18(两端)；4B18(中部)。④箍筋：8Φ8@50（两端）；4Φ8@100（中部）；⑤纵向钢筋混凝土保护层厚度： 25mm⑥试件的配筋情况（如上图所示）；⑦取偏心距e0=200mm3．试件材料力学性能试验结果钢筋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）5.486.0517436.1481.4光圆钢412.575.335.9620424.1474.3430.1477.915.6818.0211554.6637.3螺纹钢628.2716.7218.1911591.3643.3573.0640.3光圆钢628.2711.3215.4322400.4392.2545.710.8615.5220384.1548.9547.3850.2732.9134.7417654.7646.7691.1螺纹钢32.134.7616638.6691.5691.3光圆钢850.2720.6328.6621410.4413.3570.220.9228.7324416.2571.6570.914153.9482.0995.2523533.3533.6618.8螺纹钢82.1895.1518533.9618.1618.4螺纹钢18254.47118.17159.2422464.4467.2625.8119.59158.7424470.0623.8624.8129.07186.9425410.8595.0螺纹钢20314.16131.62187.8126419.0597.8414.9596.4混凝土试块强度试验结果序号试块尺寸荷载(kN)强度（MPa）1746.933.22150*150*150749.133.33737.632.8平均值（MPa）33.14．试件验算柱极限承载力2，，，不妨令：A1fcbh01c00ys0sB)C2fbh(ehfA(ha)BB24AC从而有：2A混凝土结构基本原理实验报告 第3页 共9页Ncu1fcbho'fo2(10.5)fcu'1cySNe(hbh')A0s266,e00.5h-asemm0.238Ncu 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。Pe0e0P图5.1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。混凝土结构基本原理实验报告 第4页 共9页纵筋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）混凝土结构基本原理实验报告 第5页 共9页图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的网格。试验时借助放大镜查找裂缝。混凝土结构基本原理实验报告 第6页 共9页6．试验过程破坏时加载过程中背部首先出现裂缝，并随着荷载的不断增大，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混凝土结构基本原理实验报告 第7页 共9页纵筋应变（με）位移测量（mm）荷载（kN）12345678下支座侧向下部侧向中部侧向上部上支座00000000000000158108135132-85-134-113-1361.07-2.07-1.1-0.23-0.3719393296385336-179-282-221-2911.82-2.03-0.54-0.15-0.5139.25628502627538-264-427-308-4422.48-1.930.080.09-0.6159.5877726878759-363-584-411-6043.16-1.810.790.3-0.6581.2511309611136991-467-744-526-7713.88-1.681.560.45-0.68101.251388120913961239-593-914-661-9454.64-1.522.40.67-0.72121.251433125414451283-628-958-699-9914.86-1.482.620.75-0.73122.51433125514461284-631-962-701-9944.86-1.482.630.74-0.731231448126714611300-642-974-711-10064.92-1.482.670.75-0.73125.251472128814831323-653-989-722-10214.97-1.482.730.74-0.731281498131315111350-665-1005-735-10395.02-1.452.810.79-0.73130.751527134015401377-679-1021-750-10545.09-1.442.880.8-0.73133.51554136515661403-690-1038-761-10715.16-1.432.960.85-0.73135.751577139115901427-703-1053-773-10875.22-1.423.050.86-0.73137.751600141416131449-714-1068-785-11035.32-1.43.120.89-0.73139.51621143616341471-727-1082-798-11195.37-1.393.220.86-0.731411643145916581493-738-1098-811-11345.45-1.373.290.9-0.741431665148216811517-752-1114-824-11505.52-1.353.360.93-0.73144.751687150517051541-766-1131-838-11675.6-1.353.440.96-0.73146.251710152817281564-778-1146-854-11845.67-1.333.530.98-0.73148.251736155317531589-793-1165-868-12035.76-1.323.640.95-0.74150.751787160818061643-821-1202-898-12395.91-1.293.831.02-0.75155.251837165818571694-850-1238-929-12766.06-1.244.021.05-0.751591886170519051744-879-1274-959-13136.24-1.214.21.08-0.77162.251933175519531790-908-1308-990-13516.41-1.164.391.15-0.77165.751979180320021840-937-1346-1022-13886.58-1.124.561.2-0.77169.252026185120501887-967-1384-1053-14296.74-1.14.741.23-0.79172.52075190021011936-999-1420-1085-14696.89-1.074.911.25-0.78176.252122194921491985-1029-1460-1117-15087.06-1.035.111.29-0.79179.52167199421952031-1059-1497-1149-15487.22-15.291.35-0.8182.752212204022412076-1090-1535-1180-15877.37-0.965.481.4-0.791862256208622862121-1122-1572-1212-16277.54-0.945.651.42-0.791892298213023322167-1151-1607-1244-16657.7-0.915.841.45-0.81922341217323752210-1182-1644-1277-17037.87-0.876.021.49-0.8194.752383221524182254-1211-1680-1307-17428.04-0.856.211.55-0.8197.752423225824612294-1240-1715-1338-17798.18-0.86.41.59-0.79200.752463229825032335-1270-1750-1368-18168.35-0.776.571.66-0.8203.252503233625442376-1298-1785-1399-18548.51-0.736.741.62-0.82062539237325822416-1326-1818-1428-18898.69-0.76.921.65-0.8208.52570241325762457-1353-1853-1455-19268.84-0.677.11.69-0.82112601245225952497-1379-1888-1482-19629.01-0.657.291.76-0.82132628249426042538-1405-1922-1507-19989.17-0.67.491.78-0.82152634254325922590-1427-1962-1528-20389.34-0.557.691.84-0.82172626262025362671-1444-2014-1543-20909.53-0.537.91.85-0.81218.252625270324932760-1461-2072-1559-21489.68-0.498.121.93-0.81219.752630276724862827-1482-2124-1579-21989.85-0.478.321.93-0.812212644274425042658-1515-2170-1608-224410.03-0.448.581.97-0.81220.752645272125162577-1556-2227-1641-230110.19-0.388.872.02-0.8220.52639271125322601-1604-2285-1685-235810.37-0.369.132.09-0.81220.752629270725362645-1650-2343-1738-241510.53-0.329.422.13-0.81221.52634270725432669-1701-2405-1787-247910.74-0.289.732.19-0.81222.752641270225452656-1764-2420-1850-252010.98-0.2310.132.26-0.81222.752615269725472605-1830-2438-1925-254311.25-0.1810.552.32-0.81222.252576268425512566-1898-2457-2007-256411.51-0.1311.022.42-0.81222.252572266225382504-1958-2464-2084-258711.78-0.0811.472.5-0.81221.52551264425302486-2009-2466-2150-260612.07-0.0111.942.57-0.81220.52560263625252566-2056-2470-2218-263312.330.0112.362.64-0.82202665263425152771-2103-2471-2296-265712.610.0712.782.77-0.81219.52913262825243223-2151-2471-2385-268612.910.1213.212.83-0.82193370260225194240-2198-2470-2479-270613.180.1613.682.99-0.82183760255325495348-2245-2468-2582-272913.460.214.13.06-0.8216.754494250726524432-2295-2468-2694-275513.740.2514.573.1-0.8215.255055247329784018-2359-2466-2896-278914.020.2914.993.24-0.8213.255323246138754057-2370-2458-3007-273114.30.3315.423.33-0.8211.255198249055334015-2381-2454-3003-269714.60.3815.853.44-0.8209.54