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The special reinforced concrete composite beam consists of a steel fiber reinforced self-stressing concrete composite layer
and a reinforced concrete T-beam, and constructional bars are set up at their bonding interface. Fatigue properties of the
composite beam under the action of negative moment were experimentally studied. Through inverted loading mode the load-bearing
state of a composite beam was simulated under the action of negative moment. With the ratios of constructional bars being
0, 0.082% and 0.164% respectively as parameters, the effects of constructional bars on the properties of composite beam, such
as fatigue life, crack propagation, rigidity loss as well as damage behavior of bonding interface, were studied. The mechanism
of the constructional bars on the fatigue properties of the composite beams and the restriction mechanism of crack widths
and rigidity loss were analyzed. The test results show that the constructional bars can enhance the shear resistance of the
bonding interface between composite layer and old concrete beam and restrict expanding of steel fiber reinforced self-stressing
concrete, which are beneficial to synergistic action of composite layer and old concrete beam, to reducing the stress amplitude
of bars and the crack width of composite layer, and to increasing the durability and fatigue life of the composite beam. 相似文献
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甘肃省武威市水资源短缺,地下水严重超采,引发了一系列社会问题和生态环境问题,在分析武威市水资源及水权现状的基础上,探讨了其水价存在的问题及水价改革的重要性,提出了深化水权水价改革,形成以经济手段为主的节水机制,促进节水型社会建设的对策。 相似文献
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近年来,对于混凝土剪力墙结构型式的高层建筑,北京等地利用改进后的单面网泰柏板(有网面的苯板开槽,斜插钢丝穿过无网面的长度约40mm),贴于混凝土外墙外模板的内侧,在浇筑混凝土时,直接将伸出的斜插钢丝与混凝土浇筑成整体,使单面网泰柏板直接挂在混凝土外墙的外表面上,拆模后抹灰并做各种外墙面的装饰面层。但是,这种板在搬运、安装中,特别是在浇筑混凝土时,由于高位混凝土的自落冲击力和混凝土振捣时的侧压力较大,使苯板板槽与钢丝产生位移,钢丝网紧贴苯板,甚至埋入苯板内,此时很难保证钢丝网与苯板之间的设计间距从… 相似文献
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沈阳市北部某机关办公楼,地下室为一层不采暖的停车场,地上一层为办公用房。按照《民用建筑节能设计标准》(采暖居住建筑部分)(JGJ26—1995)要求,在沈阳地区,不采暖地下室上部地板传热系数限值为0.55W/(m2·K),故需对地下室顶板采取保温措施。通过对保温性能、施工工艺、工程进度和造价等综合考虑,采用双面阻推块型钢丝网架聚苯乙烯保温自挂板对面积为1997m2的地下室顶板进行保温,收到了良好的节能效果。1双面阻推块型钢丝网架聚苯乙烯保温自挂板技术1.1双面阻推块型钢丝网架聚苯乙烯保温自挂板制作双面阻推块型钢丝网架聚苯乙烯保温自挂… 相似文献