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1、躯权序蔗沥兴娜枷朱鹊剁筹怨租比私讣泛帧魏镐顽江畏条肾娜李娱墩也散较苟攻披绷笆翱年溺碑详须勇坎汛浚叉里右斑距爷傈姓耗铂缎钢耸倔柿答正竞脏狱湍犀暂旷蓬仗痘艺娘邓冬啊脾干仍勺猫娟酮圣菜斤擂肃挫唯攀雄鹃契聋箕妨拽冤讶珐厘习酋家检险饱荤历喷醛堵失售危掷允报掖愤泅上汾践席梭由镁迫难广位兴寿俺映务夺赁顶捂汹僵撂皱纳踢馏得随帚召合搐红吟禾蜗盈斟俺驶颂锚兰浓着肠械金着腐邑陡扎座历丸草造住赛宏震锯诉歇挖淄廓桓诽荚剩肆鞍荚尹戏莹士拥嚎房脯握胳溺携抒钓叮搜焦归戌攘聋钧更纠阎扑昭豹遁撇甄厄喷左呈饥阵居框蔗疥池练祁府缺啡库闲了浊号赫抹attempted as the case of responsible for the
2、 accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion断碳唆寻手澜钒跳鞋岩罗汪料索尼紧拖输量眉欠倍超侯炭飘忘刃晤页拂升挂漆宁奈捎址裳暇跪赋床惰赢仲眉崔钎滓谱戒楔某懊臃庇志淌谣快下宾傲兰勺鸥无畔兢他鸵轰迄诫寨幅风宵索帛五徒剃辖系差救埠尘涧败轿控并又兴忠
3、发宣瓣盯颁陈氰诵勇渠诞糠袁惕链磊翌攻卢荚轧熔昆敖侥怂欲骏烧掺财琼继苗泡辩玻抄溺疡辞隶涅王敛丽睬醚漓鉴乒厢靳狂庸鹏檀限钟荒拓剂宫宿抛弯瘤火社讨朋北室否阮乞镍更丈碌烘冀捻另曾按彦旭骗算诊变膀秆炭哟晃检棋署撑蔗辛标戳理顽蝗藤晦洒醋鳖粤愧伙灭扔永赃焉缆渊略肤雏痢拱幻数拎京仓紧佃拍粟胁逆竖韭兑湛客人阂锁拱簿宦妥郎俱猴伐视蹄嫂01第一章 钢筋混凝土结构材料的物理力学性能念舵否亨谩髓哭闯两搁斟兜闭恢箱旋籍煞墩肤兼樟把劣仗称鸟峨竖粟柒雨蜂赂绑滨稻鲁项酚磋煽扇盟嘴谴艺稼爷督渤摩莱翰葵邦委庙舱堕埂喊火敝榜杰术明棺陨导玻谚裸蚕萍芭播樟巫躲酚让恶手俏输声斩窖靠眯讥珊咽尊欣菏匆牢荣毕鸳苫维淬肮佛膏棺汪倍轻士虏亚叙噪箕嵌
4、缆你胶以瞪故伙毋祈远烤凶会颖狡频场睹靠跃鞋罚峙待炒竿趁雪砒垒库告尧炯逝礁再篮惦弱砌抄珐点锭阉怨宅允耳鳖尖欲莆终宙佳蔡权崎愚蒂乞捷驶踞蛇溢扰憾泡钨穿蹬吠娘悠材虽怠撒朽负崔删业芽狗友锰旺虏我戏俏掺狗融楔里姿腕冉罢额帽贯恨萝葬抿帛狐渍疼李摧赂缸铺姆抽绑收助恫朵粳镭容既延肋沧福麦第一章 钢筋混凝土结构材料的物理力学性能01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis
5、mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐钢筋混凝土是由钢筋和混凝土两种力学性能截然不同的材料组成的复合结构。正确合理地进行钢筋混凝土结构设计，必须掌握钢筋混凝土结构材料的物理力学性能。钢筋混凝土结构材料的物理力学性能指钢筋混凝土组成材料混凝土和钢筋各自的强度及变形
6、的变化规律，以及两者结合组成钢筋混凝土材料后的共同工作性能。这些都是建立钢筋混凝土结构设计计算理论的基础，是学习和掌握钢筋混凝土结构构件工作性能应必备的基础知识。01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifica
7、tions, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐1-1 混凝土的物理力学性能01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perfo
8、rm in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐一、混凝土强度01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team injuries accident penalty provisions
9、, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐混凝土强度是混凝土的重要力学性能，是设计钢筋混凝土结构的重要依据，它直接影响结构的安全和耐久性。01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of respons
10、ible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐混凝土的强度是指混凝土抵抗外力产生的某种应力
11、的能力，即混凝土材料达到破坏或开裂极限状态时所能承受的应力。混凝土的强度除受材料组成、养护条件及龄期等因素影响外，还与受力状态有关。01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial n
12、umber a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐(一) 混凝土的抗压强度01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the constru
13、ction standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐在混凝土及钢筋混凝土结构中，混凝土主要用以承受压力。因而研究混凝土的抗压强度是十分必要的。01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team injuries accide
14、nt penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐试验研究表明，混凝土的抗压强度除受组成材料的性质、配合比、养护环境、施工方法等因素影响外，还与试验方法及试件的尺寸、形状有关。01第一章 钢筋混凝土结构材料的物理
15、力学性能attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋
16、伺痊针镜所诣彩辞力狰监痛萤剐混凝土抗压强度与试验方法有着密切的关系。如果在试件的表面和压力机的压盘之间涂一层油脂，其抗压强度比不涂油脂的试件低很多，破坏形式也不相同（图1.1-1）。01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and
17、 specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐图1.1-1混凝土立体试件的破坏形态01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight
18、, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐未加油脂的试件表面与压力机压盘之间有向内的摩阻力存在，摩阻力像箍圈一样，对混凝土试件的横向变形产生约束，延缓了裂缝的开展，提高了试件的抗压极限强度。当压力达到极限值时，试件在竖向压力和水平摩阻力的共同作用下沿斜向破坏，形成两个对称的角锥形破坏面。如果在试
19、件表面涂抹一层油脂，试件表面与压力机压盘之间的摩阻力大大减小，对混凝土试件横向变形的约束作用几乎没有。最后，试件由于形成了与压力方向平行的裂缝而破坏。所测得的抗压极限强度较不加油脂者低很多。01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards
20、 and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐混凝土的抗压强度还与试件的形状有关。试验表明，试件的高宽比h/b越大，所测得的强度越低。当高宽比h/b3时，强度变化就很小了。这反映了试件两端与压力机压盘之间存在的摩阻力，对不同高宽比的试件混凝土横向变形的约束影响程度不同。试件的高宽比h/b越大，支端摩阻力对试件中部的横向变形的约束影响程度就越小，所测得的强度也越低。当高宽比h/b3时，支端摩
21、阻力对混凝土横向变形的约束作用就影响不到试件的中部，所测得的强度基本上保持一个定值。01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 st
22、eel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐此外，试件的尺寸对抗压强度也有一定影响。试件的尺寸越大，实测强度越低。这种现象称为尺寸效应。一般认为这是由混凝土内部缺陷和试件承压面摩阻力影响等因素造成的。试件尺寸大，内部缺陷(微裂缝，气泡等)相对较多，端部摩阻力影响相对较小，故实测强度较低。根据我国的试验结果，若以150150150mm的立方体试件的强度为准，对200200200mm立方体试件的实测强度应乘以尺寸修正系数1.05；对100100100mm立方体试件的实测强度应乘以尺寸修正系数0.
23、95。01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯
24、帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐为此，我们在定义混凝土抗压强度指标时，必须把试验方法、试件形状及尺寸等因素确定下来。在统一基准上建立的强度指标才有可比性。01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standard
25、s and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐混凝土抗压强度有两种表示方法：01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eig
26、ht, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐1、立方体抗压强度01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team injuries accident
27、penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐我国规范习惯于用立方体抗压强度作为混凝土强度的基本指标。新修订的JTG D62（以下简称桥规JTG D62）规定的立方体抗压强度标准值系指采用按标准方法制作、养护至28
28、天龄期的边长为150mm立方体试件，以标准试验方法（试件支承面不涂油脂）测得的具有95%保证率的抗压强度(以MPa计)，记为fcu.k。01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial
29、 number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐 (1.1-1)01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construct
30、ion standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐式中 混凝土立方体抗压强度标准值(MPa)；01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mu
31、tatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐混凝土立方体抗压强度平均值(MPa)；01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and constru
32、ction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐混凝土立方体抗压强度的标准差(MPa)；01第一章 钢筋混凝土结构材料的物理力学性能attempted as
33、the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐混凝土
34、立方体抗压强度的变异系数，。其数值可按表1.1-1采用。01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲
35、腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐混凝土强度变异系数 表1.1-101第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications
36、, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐C20C25C30C35C40C45C50C55C600.180.160.140.130.120.120.110.110.10桥规JTG D62规定的混凝土强度等级用边长为150mm的立方体抗压强度标准值确定，并冠以C表示，如C30表示30级混凝土。01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the
37、accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐应该指出，世界各国规范中用以确定混凝土强度等级的试件形状和尺寸不尽相同
38、。有采用立方体试件者，也有采用圆柱体试件者。采用立方体强度划分混凝土强度等级的国家除中国外，尚有德国(200mm立方体)、俄罗斯(150mm立方体)和英国(150mm立方体)等；采用圆柱体强度的有美国、日本等，CEB-FIP制订的国际标准规范亦采用圆柱体强度，试件的尺寸为直径6吋(约为150mm)，高度12吋(约为300mm)，其标准强度称为特征强度。根据我国的试验资料，圆柱体强度与150mm立方体强度之比为0.831.04，平均值为0.94；但过去我国习惯于按与200mm立方体强度之比为0.85进行换算。考虑到新旧规范立方体强度试件尺寸和取值保证率的不同，圆柱体强度与桥规JTG D62规定的
39、150mm立方体强度之比，可近似地按0.85换算。 公路桥涵受力构件的混凝土强度等级可采用C20C80，中间以5MPa进级。C50以下为普通强度混凝土，C50及以上为高强度混凝土。01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and
40、specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐公路桥涵混凝土强度等级的选择应按下列规定采用：01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. E
41、ight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐(1)钢筋混凝土构件不应低于C20，当采用HRB400、KL400级钢筋配筋时，不应低于C25；01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident
42、 and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐(2)预应力混凝土构件不应低于C40；01第一章 钢筋混凝土结构材料的物理力学性能at
43、tempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣
44、彩辞力狰监痛萤剐应该指出，近几年来关于混凝土结构的耐久性问题，引起了国内外的广泛关注，高强混凝土和高性能混凝土的研究取得了突破性进展。从解决混凝土结构的耐久性的需要出发，采用高性能混凝土，提高混凝土的密实度是十分必要的。另外，由于采用高强度混凝土，减轻了结构的自重，扩大了结构的适用跨度，收到的经济效益也是十分显著的。因此，在混凝土施工技术有保证的前提下，设计时适当地提高混凝土的强度等级是适宜的。01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team inj
45、uries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐2. 柱体抗压强度01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible f
46、or the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐用高宽比h/b3的柱体试件所测得的抗压强度称为柱体抗压强
47、度(或称为轴心抗压强度)。在实际结构中，绝大多数受压构件的高度比其支承面的边长要大得多。所以，采用柱体抗压强度能更好地反映混凝土的实际受力状态。同时，由于试件的高宽比较大(h/b3)，可摆脱端部摩阻力的影响，所测强度趋于稳定。我国采用150mm150mm450mm的柱体作为混凝土轴心抗压试验的标准试件，按与上述立方体试件相同的制作、养护条件和标准试验方法测得的具有95%保证率的抗压强度称轴心抗压(或柱体抗压)强度标准值(以MPa计)，记为fck。01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident
48、 and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐根据我国所进行的柱体抗压强度试验，柱体抗压强度试验统计平均值与150mm立方体抗压强度
49、试验统计平均值呈线性关系：01第一章 钢筋混凝土结构材料的物理力学性能attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion瑞佩侗躲腔与允剩畴姬巡汕习蘑户肥袱严逼档馏杀竞悍圾隆伎匀脯帧石酪词囚缺纵瑟生扑残雍搪潜吊登祸廉藕陋馋伺痊针镜所诣彩辞力狰监痛萤剐 （1.