大偏心受壓柱匯總

1、同濟(jì)大學(xué)混凝土結(jié)構(gòu)基本原理實(shí)驗(yàn)報(bào)告（共 9 頁(yè)）姓名梁煒煉學(xué)號(hào)1350240專(zhuān)業(yè)建筑工程學(xué)院土木工程學(xué)院指導(dǎo)老師魯亮同濟(jì)大學(xué)結(jié)構(gòu)工程與防災(zāi)研究所2015 年 12 月 28 日1. 實(shí)驗(yàn)?zāi)康暮蛢?nèi)容1.1、試驗(yàn)?zāi)康耐ㄟ^(guò)試驗(yàn)研究認(rèn)識(shí)混凝土結(jié)構(gòu)構(gòu)件的破壞全過(guò)程，掌握測(cè)試混凝土大偏 心受壓構(gòu)件基本性能的試驗(yàn)方法。1.2、試驗(yàn)內(nèi)容對(duì)大偏心短柱施加軸向荷載直至破壞。 觀察加載過(guò)程中裂縫的開(kāi)展情況, 將得到的極限荷載與計(jì)算值相比較。2. 試件介紹（1）試件設(shè)計(jì)的依據(jù)為減少“二階效應(yīng)”的影響，將試件設(shè)計(jì)為短柱，即控制10/h 5。通過(guò)調(diào)整軸向力的作用位置，即偏心距e0=200mm使試件的破壞狀態(tài)為大偏心受壓破

2、壞。（2）試件的主要參數(shù) 試件尺寸截面尺寸：200X 400mm（兩端）;200 x 200mm（中部）;試件長(zhǎng)度：1300mm 混凝土強(qiáng)度等級(jí)：C25 縱向鋼筋：8B18（兩端）;4B18（中部）。 箍筋：8850（兩端）;48100（中部）； 縱向鋼筋混凝土保護(hù)層厚度：25mm 試件的配筋情況（如上圖所示）； 取偏心距e0=200mm3. 試件材料力學(xué)性能試驗(yàn)結(jié)果鋼筋力學(xué)性能試驗(yàn)結(jié)果鋼筋類(lèi)型鋼筋直徑/mm面積屈服強(qiáng)度/kN極限強(qiáng)度/kN延伸率（%屈服強(qiáng)度（MPa平均值（MPa極限抗拉強(qiáng)度（MPa平均值（MPa光圓鋼412.575.486.0517436.1430.1481.4477.95.

3、335.9620424.1474.3螺紋鋼628.2715.6818.0211554.6573.0637.3640.316.7218.1911591.3643.3光圓鋼628.2711.3215.4322400.4392.2545.7547.310.8615.5220384.1548.9螺紋鋼850.2732.9134.7417654.7646.7691.1691.332.134.7616638.6691.5光圓鋼850.2720.6328.6621410.4413.3570.2570.920.9228.7324416.2571.6螺紋鋼14153.9482.0995.2523533.3533

4、.6618.8618.482.1895.1518533.9618.1螺紋鋼18254.47118.17159.2422464.4467.2625.8624.8119.59158.7424470.0623.8螺紋鋼20314.16129.07186.9425410.8414.9595.0596.4131.62187.8126419.0597.8混凝土試塊強(qiáng)度試驗(yàn)結(jié)果骨口. 序號(hào)試塊尺寸何載（kN）強(qiáng)度（MPa1746.933.22150*150*150749.133.33737.632.8平均值（MPa33.14. 試件驗(yàn)算柱極限承載力不妨令：二 fcbh02A-， B1fcbh0（e h） ,

5、 C = fyAJ% as2A從而有:八 fcbh。2 Ne = otifcbho 耳1 0. 5匕）+ fyA（h ?。〆 = e00. 5h - as = 266mm二 E = 0. 238Ncu =261.5KN5. 試驗(yàn)方法5.1加載裝置柱偏心受壓試驗(yàn)的加載裝置如圖所示。采用千斤頂加載，支座一端為固定鉸 支座，另一端為滾動(dòng)鉸支座。鉸支座墊板應(yīng)有足夠的剛度，避免墊板處混凝土局 壓破壞。圖5.1柱偏心受壓試驗(yàn)加載裝置5.2加載方式（1）單調(diào)分級(jí)加載機(jī)制實(shí)際的加載等級(jí)為 0-20kN-40kN-60kN-80kN-100kN-120kN-破壞5.3量測(cè)內(nèi)容（1）縱筋應(yīng)變由布置在柱內(nèi)部縱筋表面

6、的應(yīng)變計(jì)量測(cè)，鋼筋應(yīng)變測(cè)點(diǎn)布置如下圖200200/4/)0/ *200縱筋A(yù) （應(yīng)變1、3） 縱筋C （應(yīng)變2、4）縱筋B （應(yīng)變5、7） 縱筋D （應(yīng)變6、6）圖531大偏心受壓柱試驗(yàn)縱向鋼筋應(yīng)變測(cè)點(diǎn)布置(2)側(cè)向撓度 柱長(zhǎng)度范圍內(nèi)布置5個(gè)位移計(jì)以測(cè)量柱側(cè)向撓度，側(cè)向撓度測(cè)點(diǎn)布置如下圖圖5.3.2大偏心受壓柱試驗(yàn)側(cè)向撓度測(cè)點(diǎn)布置(3) 裂縫試驗(yàn)前將柱四面用石灰漿刷白，并繪制50mM 50mm勺網(wǎng)格。試驗(yàn)時(shí)借助放大鏡查找裂縫。6. 試驗(yàn)過(guò)程破壞時(shí)加載過(guò)程中背部首先出現(xiàn)裂縫，并隨著荷載的不斷增大，不斷擴(kuò)大，隨后與 兩側(cè)裂縫相連接。破壞后構(gòu)件破壞主裂縫在上端且裂縫與偏心方向平行，說(shuō)明構(gòu)件本身存在問(wèn)

7、題；破 壞時(shí)，構(gòu)件受壓處沒(méi)有明顯壓碎痕跡； 但背部裂縫呈平行均勻分布，間距基本在 10cm，與理論分析結(jié)果較為符合。7. 試驗(yàn)結(jié)果分析實(shí)際試驗(yàn)數(shù)據(jù)荷載（kN）158108135132-85-134-113-1361.07-2.07-1.1-0.23-0.3719393296385336-179-282-221-2911.82-2.03-0.54-0.15-0.5139.25628502627538-264-427-308-4422.48-1.930.080.09-0.6159.5877726878759-363-584-411-6043.16-1.810.790.3-0.6581.251130

8、9611136991-467-744-526-7713.88-1.681.560.45-0.68101.251388120913961239-593-914-661-9454.64-1.522.40.67-0.72121.251433125414451283-628-958-699-9914.86-1.482.620.75-0.73122.51433125514461284-631-962-701-9944.86-1.482.630.74-0.731231448126714611300-642-974-711-10064.92-1.482.670.75-0.73125.251472128814

9、831323-653-989-722-10214.97-1.482.730.74-0.731281498131315111350-665-1005-735-10395.02-1.452.810.79-0.73130.751527134015401377-679-1021-750-10545.09-1.442.880.8-0.73133.51554136515661403-690-1038-761-10715.16-1.432.960.85-0.73135.751577139115901427-703-1053-773-10875.22-1.423.050.86-0.73137.75160014

10、1416131449-714-1068-785-11035.32-1.43.120.89-0.73139.51621143616341471-727-1082-798-11195.37-1.393.220.86-0.731411643145916581493-738-1098-811-11345.45-1.373.290.9-0.7414350010304070806位移測(cè)量（mm側(cè)向下部0側(cè)向中部 側(cè)向上部 上支座0 tz縱筋應(yīng)變（卩）20-0.73-0.73下支座0166516871710173617871482150515281553160816811705172817531806151

11、71541156415891643-752-766-778-1114-1131-1146-824-838-854-1150-1167-11845.525.6-1.35-1.353.363.443.533.643.830.930.960.980.95-0.73144.75146.25148.25150.75155.251837165818571694-850-1238-929-12766.06-1.244.021.05-0.751591886170519051744-879-1274-959-13136.24-1.214.21.08-0.77162.251933175519531790-908-

12、1308-990-13516.41-1.164.391.15-0.77165.751979180320021840-937-1346-1022-13886.58-1.124.561.2-0.77169.252026185120501887-967-1384-1053-14296.74-1.14.741.23-0.79172.52075190021011936-999-1420-1085-14696.89-1.074.911.25-0.78176.252122194921491985-1029-1460-1117-15087.06-1.035.111.29-0.79179.52167199421

13、952031-1059-1497-1149-15487.22-15.291.35-0.8182.752212204022412076-1090-1535-1180-15877.37-0.965.481.4-0.791862256208622862121-1122-1572-1212-16277.54-0.945.651.42-0.791892298213023322167-1151-1607-1244-16657.7-0.915.841.45-0.81922341217323752210-1182-1644-1277-17037.87-0.876.021.49-0.8194.752383221

14、524182254-1211-1680-1307-17428.04-0.856.211.55-0.8197.752423225824612294-1240-1715-1338-17798.18-0.86.41.59-0.79200.752463229825032335-1270-1750-1368-18168.35-0.776.571.66-0.8203.252503233625442376-1298-1785-1399-18548.51-0.736.741.62-0.82062539237325822416-1326-1818-1428-18898.69-0.76.921.65-0.8208

15、.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

16、.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.

17、369.132.09-0.81220.752629270725362645-1650-2343-1738-241510.53-0.329.422.13-0.81221.52634270725432669-1701-2405-1787-247910.74-0.289.732.19-0.81222.752641270225452656-1764-2420-1850-252010.98-0.2310.132.26-0.81222.752615269725472605-1830-2438-1925-254311.25-0.1810.552.32-0.81222.252576268425512566-1

18、898-2457-2007-256411.51-0.1311.022.42-0.81222.252572266225382504-1958-2464-2084-258711.78-0.0811.472.5-0.81221.52551264425302486-2009-2466-2150-260612.07-0.0111.942.57-0.81220.52560263625252566-2056-2470-2218-263312.330.0112.362.64-0.82202665263425152771-2103-2471-2296-265712.610.0712.782.77-0.81219

19、.52913262825243223-2151-2471-2385-268612.910.1213.212.83-0.82193370260225194240-2198-2470-2479-270613.180.1613.682.99-0.82183760255325495348-2245-2468-2582-272913.460.214.13.06-0.8216.754494250726524432-2295-2468-2694-275513.740.2514.573.1-0.8215.255055247329784018-2359-2466-2896-278914.020.2914.993.24-0.8213.255323246138754057-2370-2458-3007-273114.30.3315.423.33-0.8211.255198249055334015-2381-2454-3003-269714.60.3815.853.44-0.8209.54864259972754032-2390-2448-3014-267614.870.4216.263.57-0.82084861289885364029-2391-2440-3065-258515.170.4